src/main/resources/md/chapter07.md · 石奈子/SpringBootLearn

# SpringBoot 2.0 系列007 --WEB容器详解
> 我们知道java常用的两大容器tomcat和jetty，其中SB默认内嵌了tomcat容器。那么SB都支持什么属性呢？

- 参阅ServerProperties.java
> 基本是通用的服务器配置，以及error、Compression、Http2、Servlet、Tomcat、Jetty、Undertow等配置。

# 可用配置

## 1. 通用服务配置

### port
> 服务器端口号
- 使用方式
> server.port=8080，默認端口号8080

### address
> 服务绑定的网络地址

- 使用方式
>server.address=127.0.0.1

### useForwardHeaders
> 请求是否允许X-Forwarded-*

- 使用方式
>server.use-forward-headers=false

### serverHeader
> 服务响应头信息

- 使用方式
>server.server-header=xxxx

### maxHttpHeaderSize
> 最大头信息大小

- 使用方式
>server.max-http-header-size=0

### connectionTimeout
> 连接超时时间

- 使用方式
>server.connection-timeout=-1

## 2. ssl
> 主要是ssl相关配置。具体参阅 org.springframework.boot.web.server.Ssl类

- 使用方式
> server.ssl.xxx=xxx

```html
server.ssl.ciphers= # Supported SSL ciphers.
server.ssl.client-auth= # Whether client authentication is wanted ("want") or needed ("need"). Requires a trust store.
server.ssl.enabled= # Enable SSL support.
server.ssl.enabled-protocols= # Enabled SSL protocols.
server.ssl.key-alias= # Alias that identifies the key in the key store.
server.ssl.key-password= # Password used to access the key in the key store.
server.ssl.key-store= # Path to the key store that holds the SSL certificate (typically a jks file).
server.ssl.key-store-password= # Password used to access the key store.
server.ssl.key-store-provider= # Provider for the key store.
server.ssl.key-store-type= # Type of the key store.
server.ssl.protocol=TLS # SSL protocol to use.
server.ssl.trust-store= # Trust store that holds SSL certificates.
server.ssl.trust-store-password= # Password used to access the trust store.
server.ssl.trust-store-provider= # Provider for the trust store.
server.ssl.trust-store-type= # Type of the trust store.
```

```java
public class Ssl {

/**
	 * Whether to enable SSL support.
	 */
	private boolean enabled = true;

/**
	 * Whether client authentication is wanted ("want") or needed ("need"). Requires a
	 * trust store.
	 */
	private ClientAuth clientAuth;

/**
	 * Supported SSL ciphers.
	 */
	private String[] ciphers;

/**
	 * Enabled SSL protocols.
	 */
	private String[] enabledProtocols;

/**
	 * Alias that identifies the key in the key store.
	 */
	private String keyAlias;

/**
	 * Password used to access the key in the key store.
	 */
	private String keyPassword;

/**
	 * Path to the key store that holds the SSL certificate (typically a jks file).
	 */
	private String keyStore;

/**
	 * Password used to access the key store.
	 */
	private String keyStorePassword;

/**
	 * Type of the key store.
	 */
	private String keyStoreType;

/**
	 * Provider for the key store.
	 */
	private String keyStoreProvider;

/**
	 * Trust store that holds SSL certificates.
	 */
	private String trustStore;

/**
	 * Password used to access the trust store.
	 */
	private String trustStorePassword;

/**
	 * Type of the trust store.
	 */
	private String trustStoreType;

/**
	 * Provider for the trust store.
	 */
	private String trustStoreProvider;

/**
	 * SSL protocol to use.
	 */
	private String protocol = "TLS";

public boolean isEnabled() {
		return this.enabled;
	}

public void setEnabled(boolean enabled) {
		this.enabled = enabled;
	}

public ClientAuth getClientAuth() {
		return this.clientAuth;
	}

public void setClientAuth(ClientAuth clientAuth) {
		this.clientAuth = clientAuth;
	}

public String[] getCiphers() {
		return this.ciphers;
	}

public void setCiphers(String[] ciphers) {
		this.ciphers = ciphers;
	}

public String getKeyAlias() {
		return this.keyAlias;
	}

public void setKeyAlias(String keyAlias) {
		this.keyAlias = keyAlias;
	}

public String getKeyPassword() {
		return this.keyPassword;
	}

public void setKeyPassword(String keyPassword) {
		this.keyPassword = keyPassword;
	}

public String getKeyStore() {
		return this.keyStore;
	}

public void setKeyStore(String keyStore) {
		this.keyStore = keyStore;
	}

public String getKeyStorePassword() {
		return this.keyStorePassword;
	}

public void setKeyStorePassword(String keyStorePassword) {
		this.keyStorePassword = keyStorePassword;
	}

public String getKeyStoreType() {
		return this.keyStoreType;
	}

public void setKeyStoreType(String keyStoreType) {
		this.keyStoreType = keyStoreType;
	}

public String getKeyStoreProvider() {
		return this.keyStoreProvider;
	}

public void setKeyStoreProvider(String keyStoreProvider) {
		this.keyStoreProvider = keyStoreProvider;
	}

public String[] getEnabledProtocols() {
		return this.enabledProtocols;
	}

public void setEnabledProtocols(String[] enabledProtocols) {
		this.enabledProtocols = enabledProtocols;
	}

public String getTrustStore() {
		return this.trustStore;
	}

public void setTrustStore(String trustStore) {
		this.trustStore = trustStore;
	}

public String getTrustStorePassword() {
		return this.trustStorePassword;
	}

public void setTrustStorePassword(String trustStorePassword) {
		this.trustStorePassword = trustStorePassword;
	}

public String getTrustStoreType() {
		return this.trustStoreType;
	}

public void setTrustStoreType(String trustStoreType) {
		this.trustStoreType = trustStoreType;
	}

public String getTrustStoreProvider() {
		return this.trustStoreProvider;
	}

public void setTrustStoreProvider(String trustStoreProvider) {
		this.trustStoreProvider = trustStoreProvider;
	}

public String getProtocol() {
		return this.protocol;
	}

public void setProtocol(String protocol) {
		this.protocol = protocol;
	}

/**
	 * Client authentication types.
	 */
	public enum ClientAuth {

/**
		 * Client authentication is wanted but not mandatory.
		 */
		WANT,

/**
		 * Client authentication is needed and mandatory.
		 */
		NEED

}

```

## 3. compression
> 简单的压缩配置，具体参阅org.springframework.boot.web.server.Compression

- 使用方式
>server.compression.xx=xx

```html
server.compression.enabled=false # Whether response compression is enabled.
server.compression.excluded-user-agents= # List of user-agents to exclude from compression.
server.compression.mime-types=text/html,text/xml,text/plain,text/css,text/javascript,application/javascript # Comma-separated list of MIME types that should be compressed.
server.compression.min-response-size=2048 # Minimum "Content-Length" value that is required for compression to be performed.

```

- 附源码
```java
public class Compression {

/**
	 * Whether response compression is enabled.
	 */
	private boolean enabled = false;

/**
	 * Comma-separated list of MIME types that should be compressed.
	 */
	private String[] mimeTypes = new String[] { "text/html", "text/xml", "text/plain",
			"text/css", "text/javascript", "application/javascript", "application/json",
			"application/xml" };

/**
	 * Comma-separated list of user agents for which responses should not be compressed.
	 */
	private String[] excludedUserAgents = null;

/**
	 * Minimum "Content-Length" value that is required for compression to be performed.
	 */
	private int minResponseSize = 2048;

public boolean getEnabled() {
		return this.enabled;
	}

public void setEnabled(boolean enabled) {
		this.enabled = enabled;
	}

public String[] getMimeTypes() {
		return this.mimeTypes;
	}

public void setMimeTypes(String[] mimeTypes) {
		this.mimeTypes = mimeTypes;
	}

public int getMinResponseSize() {
		return this.minResponseSize;
	}

public void setMinResponseSize(int minSize) {
		this.minResponseSize = minSize;
	}

public String[] getExcludedUserAgents() {
		return this.excludedUserAgents;
	}

public void setExcludedUserAgents(String[] excludedUserAgents) {
		this.excludedUserAgents = excludedUserAgents;
	}

}
```

## 4. http2
> 主要是开启http2的支持，具体参阅org.springframework.boot.web.server.Http2

- 使用方式
> server.http2.enabled=false

## 5. servlet
> 主要是servlet相关的配置，具体参阅org.springframework.boot.autoconfigure.web.ServerProperties.Servlet

- 使用方式
> server.servlet.contextPath=/chapter01

```html
server.servlet.context-parameters.*= # Servlet context init parameters.
server.servlet.context-path= # Context path of the application.
server.servlet.application-display-name=application # Display name of the application.
server.servlet.jsp.class-name=org.apache.jasper.servlet.JspServlet # The class name of the JSP servlet.
server.servlet.jsp.init-parameters.*= # Init parameters used to configure the JSP servlet.
server.servlet.jsp.registered=true # Whether the JSP servlet is registered.
server.servlet.path=/ # Path of the main dispatcher servlet.
server.servlet.session.cookie.comment= # Comment for the session cookie.
server.servlet.session.cookie.domain= # Domain for the session cookie.
server.servlet.session.cookie.http-only= # "HttpOnly" flag for the session cookie.
server.servlet.session.cookie.max-age= # Maximum age of the session cookie. If a duration suffix is not specified, seconds will be used.
server.servlet.session.cookie.name= # Session cookie name.
server.servlet.session.cookie.path= # Path of the session cookie.
server.servlet.session.cookie.secure= # "Secure" flag for the session cookie.
server.servlet.session.persistent=false # Whether to persist session data between restarts.
server.servlet.session.store-dir= # Directory used to store session data.
server.servlet.session.timeout= # Session timeout. If a duration suffix is not specified, seconds will be used.
server.servlet.session.tracking-modes= # Session tracking modes (one or more of the following: "cookie", "url", "ssl").
```

## 6. tomcat
> 主要是tomcat相关配置，具体参阅org.springframework.boot.autoconfigure.web.ServerProperties.Tomcat

- 使用方式
> server.tomcat.uri-encoding=UTF-8

```html
server.tomcat.accept-count=0 # Maximum queue length for incoming connection requests when all possible request processing threads are in use.
server.tomcat.accesslog.buffered=true # Whether to buffer output such that it is flushed only periodically.
server.tomcat.accesslog.directory=logs # Directory in which log files are created. Can be absolute or relative to the Tomcat base dir.
server.tomcat.accesslog.enabled=false # Enable access log.
server.tomcat.accesslog.file-date-format=.yyyy-MM-dd # Date format to place in the log file name.
server.tomcat.accesslog.pattern=common # Format pattern for access logs.
server.tomcat.accesslog.prefix=access_log # Log file name prefix.
server.tomcat.accesslog.rename-on-rotate=false # Whether to defer inclusion of the date stamp in the file name until rotate time.
server.tomcat.accesslog.request-attributes-enabled=false # Set request attributes for the IP address, Hostname, protocol, and port used for the request.
server.tomcat.accesslog.rotate=true # Whether to enable access log rotation.
server.tomcat.accesslog.suffix=.log # Log file name suffix.
server.tomcat.additional-tld-skip-patterns= # Comma-separated list of additional patterns that match jars to ignore for TLD scanning.
server.tomcat.background-processor-delay=30s # Delay between the invocation of backgroundProcess methods. If a duration suffix is not specified, seconds will be used.
server.tomcat.basedir= # Tomcat base directory. If not specified, a temporary directory is used.
server.tomcat.internal-proxies=10\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}|\\
		192\\.168\\.\\d{1,3}\\.\\d{1,3}|\\
		169\\.254\\.\\d{1,3}\\.\\d{1,3}|\\
		127\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}|\\
		172\\.1[6-9]{1}\\.\\d{1,3}\\.\\d{1,3}|\\
		172\\.2[0-9]{1}\\.\\d{1,3}\\.\\d{1,3}|\\
		172\\.3[0-1]{1}\\.\\d{1,3}\\.\\d{1,3} # Regular expression matching trusted IP addresses.
server.tomcat.max-connections=0 # Maximum number of connections that the server accepts and processes at any given time.
server.tomcat.max-http-header-size=0 # Maximum size, in bytes, of the HTTP message header.
server.tomcat.max-http-post-size=0 # Maximum size, in bytes, of the HTTP post content.
server.tomcat.max-threads=0 # Maximum number of worker threads.
server.tomcat.min-spare-threads=0 # Minimum number of worker threads.
server.tomcat.port-header=X-Forwarded-Port # Name of the HTTP header used to override the original port value.
server.tomcat.protocol-header= # Header that holds the incoming protocol, usually named "X-Forwarded-Proto".
server.tomcat.protocol-header-https-value=https # Value of the protocol header indicating whether the incoming request uses SSL.
server.tomcat.redirect-context-root= # Whether requests to the context root should be redirected by appending a / to the path.
server.tomcat.remote-ip-header= # Name of the HTTP header from which the remote IP is extracted. For instance, `X-FORWARDED-FOR`.
server.tomcat.resource.cache-ttl= # Time-to-live of the static resource cache.
server.tomcat.uri-encoding=UTF-8 # Character encoding to use to decode the URI.
server.tomcat.use-relative-redirects= # Whether HTTP 1.1 and later location headers generated by a call to sendRedirect will use relative or absolute redirects.

```

## 7. jetty
> 也是一款web服务器，这里主要是jetty相关的配置，具体参阅org.springframework.boot.autoconfigure.web.ServerProperties.Jetty

- 使用方式
> server.jetty.selectors=1

```html
server.jetty.acceptors= # Number of acceptor threads to use.
server.jetty.accesslog.append=false # Append to log.
server.jetty.accesslog.date-format=dd/MMM/yyyy:HH:mm:ss Z # Timestamp format of the request log.
server.jetty.accesslog.enabled=false # Enable access log.
server.jetty.accesslog.extended-format=false # Enable extended NCSA format.
server.jetty.accesslog.file-date-format= # Date format to place in log file name.
server.jetty.accesslog.filename= # Log filename. If not specified, logs redirect to "System.err".
server.jetty.accesslog.locale= # Locale of the request log.
server.jetty.accesslog.log-cookies=false # Enable logging of the request cookies.
server.jetty.accesslog.log-latency=false # Enable logging of request processing time.
server.jetty.accesslog.log-server=false # Enable logging of the request hostname.
server.jetty.accesslog.retention-period=31 # Number of days before rotated log files are deleted.
server.jetty.accesslog.time-zone=GMT # Timezone of the request log.
server.jetty.max-http-post-size=0 # Maximum size, in bytes, of the HTTP post or put content.
server.jetty.selectors= # Number of selector threads to use.
```

## 8. undertow
> 是红帽的一款开源web服务器，性能卓越。很多人推荐使用此款服务器。这里主要是undertow相关配置，具体参阅org.springframework.boot.autoconfigure.web.ServerProperties.Undertow

- 使用方式
> server.undertow.enabled=false

```html
server.undertow.accesslog.dir= # Undertow access log directory.
server.undertow.accesslog.enabled=false # Whether to enable the access log.
server.undertow.accesslog.pattern=common # Format pattern for access logs.
server.undertow.accesslog.prefix=access_log. # Log file name prefix.
server.undertow.accesslog.rotate=true # Whether to enable access log rotation.
server.undertow.accesslog.suffix=log # Log file name suffix.
server.undertow.buffer-size= # Size of each buffer, in bytes.
server.undertow.direct-buffers= # Whether to allocate buffers outside the Java heap.
server.undertow.io-threads= # Number of I/O threads to create for the worker.
server.undertow.eager-filter-init=true # Whether servlet filters should be initialized on startup.
server.undertow.max-http-post-size=0 # Maximum size, in bytes, of the HTTP post content.
server.undertow.worker-threads= # Number of worker threads.
```

## 9. error
> 错误相关配置

```html
server.error.include-exception=false # Include the "exception" attribute.
server.error.include-stacktrace=never # When to include a "stacktrace" attribute.
server.error.path=/error # Path of the error controller.
server.error.whitelabel.enabled=true # Whether to enable the default error page displayed in browsers in case of a server error.
```

# 三大服务器整合使用
> 这里是接之前的教程，默认已经引入我们的父工程。自己测试的话引入SB提供的parent即可。
## tomcat
> tomcat服务器的相关配置
- 内置tomcat方式
```xml
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
```
- 外置tomcat
```xml
<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        
        
        
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        
```

- application-tomcat.yml文件
```html
server:
  tomcat:
    basedir: D:\work\ricky\tomcat
```
## jetty
> jetty相关配置
- 依赖
```xml
 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        
        
        
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
```

- application-jetty.yml 示例
```xml
server:
  jetty:
    accesslog:
      enabled: true
      date-format: yyyy-MM-dd:HH:mm:ss
      filename: D:\work\ricky\jetty\access.log
```
## undertow
> undertow服务器整合
- 依赖
```xml
 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        
        
        
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-undertow</artifactId>
        </dependency>
```

- application-undertow.yml
```xml
server:
  undertow:
    accesslog:
      dir: D:\work\ricky\undertow\
      prefix: chapter05.
      suffix: log
      enabled: true
```
### 说明
> 从启动和响应来看，undertow是最快的，tomcat和jetty相差不大。

## 附源码

```java
/*
 * Copyright 2012-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.boot.autoconfigure.web;

import java.io.File;
import java.net.InetAddress;
import java.nio.charset.Charset;
import java.time.Duration;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.NestedConfigurationProperty;
import org.springframework.boot.convert.DurationUnit;
import org.springframework.boot.web.server.Compression;
import org.springframework.boot.web.server.Http2;
import org.springframework.boot.web.server.Ssl;
import org.springframework.boot.web.servlet.server.Jsp;
import org.springframework.boot.web.servlet.server.Session;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * {@link ConfigurationProperties} for a web server (e.g. port and path settings).
 *
 * @author Dave Syer
 * @author Stephane Nicoll
 * @author Andy Wilkinson
 * @author Ivan Sopov
 * @author Marcos Barbero
 * @author Eddú Meléndez
 * @author Quinten De Swaef
 * @author Venil Noronha
 * @author Aurélien Leboulanger
 * @author Brian Clozel
 * @author Olivier Lamy
 */
@ConfigurationProperties(prefix = "server", ignoreUnknownFields = true)
public class ServerProperties {

/**
	 * Server HTTP port.
	 */
	private Integer port;

/**
	 * Network address to which the server should bind.
	 */
	private InetAddress address;

@NestedConfigurationProperty
	private final ErrorProperties error = new ErrorProperties();

/**
	 * Whether X-Forwarded-* headers should be applied to the HttpRequest.
	 */
	private Boolean useForwardHeaders;

/**
	 * Value to use for the Server response header (if empty, no header is sent).
	 */
	private String serverHeader;

/**
	 * Maximum size, in bytes, of the HTTP message header.
	 */
	private int maxHttpHeaderSize = 0; // bytes

/**
	 * Time that connectors wait for another HTTP request before closing the connection.
	 * When not set, the connector's container-specific default is used. Use a value of -1
	 * to indicate no (that is, an infinite) timeout.
	 */
	private Duration connectionTimeout;

@NestedConfigurationProperty
	private Ssl ssl;

@NestedConfigurationProperty
	private final Compression compression = new Compression();

@NestedConfigurationProperty
	private final Http2 http2 = new Http2();

private final Servlet servlet = new Servlet();

private final Tomcat tomcat = new Tomcat();

private final Jetty jetty = new Jetty();

private final Undertow undertow = new Undertow();

public Integer getPort() {
		return this.port;
	}

public void setPort(Integer port) {
		this.port = port;
	}

public InetAddress getAddress() {
		return this.address;
	}

public void setAddress(InetAddress address) {
		this.address = address;
	}

public Boolean isUseForwardHeaders() {
		return this.useForwardHeaders;
	}

public void setUseForwardHeaders(Boolean useForwardHeaders) {
		this.useForwardHeaders = useForwardHeaders;
	}

public String getServerHeader() {
		return this.serverHeader;
	}

public void setServerHeader(String serverHeader) {
		this.serverHeader = serverHeader;
	}

public int getMaxHttpHeaderSize() {
		return this.maxHttpHeaderSize;
	}

public void setMaxHttpHeaderSize(int maxHttpHeaderSize) {
		this.maxHttpHeaderSize = maxHttpHeaderSize;
	}

public Duration getConnectionTimeout() {
		return this.connectionTimeout;
	}

public void setConnectionTimeout(Duration connectionTimeout) {
		this.connectionTimeout = connectionTimeout;
	}

public ErrorProperties getError() {
		return this.error;
	}

public Ssl getSsl() {
		return this.ssl;
	}

public void setSsl(Ssl ssl) {
		this.ssl = ssl;
	}

public Compression getCompression() {
		return this.compression;
	}

public Http2 getHttp2() {
		return this.http2;
	}

public Servlet getServlet() {
		return this.servlet;
	}

public Tomcat getTomcat() {
		return this.tomcat;
	}

public Jetty getJetty() {
		return this.jetty;
	}

public Undertow getUndertow() {
		return this.undertow;
	}

/**
	 * Servlet properties.
	 */
	public static class Servlet {

/**
		 * Servlet context init parameters.
		 */
		private final Map<String, String> contextParameters = new HashMap<>();

/**
		 * Context path of the application.
		 */
		private String contextPath;

/**
		 * Display name of the application.
		 */
		private String applicationDisplayName = "application";

/**
		 * Path of the main dispatcher servlet.
		 */
		private String path = "/";

@NestedConfigurationProperty
		private final Jsp jsp = new Jsp();

@NestedConfigurationProperty
		private final Session session = new Session();

public String getContextPath() {
			return this.contextPath;
		}

public void setContextPath(String contextPath) {
			this.contextPath = cleanContextPath(contextPath);
		}

private String cleanContextPath(String contextPath) {
			if (StringUtils.hasText(contextPath) && contextPath.endsWith("/")) {
				return contextPath.substring(0, contextPath.length() - 1);
			}
			return contextPath;
		}

public String getApplicationDisplayName() {
			return this.applicationDisplayName;
		}

public void setApplicationDisplayName(String displayName) {
			this.applicationDisplayName = displayName;
		}

public String getPath() {
			return this.path;
		}

public void setPath(String path) {
			Assert.notNull(path, "Path must not be null");
			this.path = path;
		}

public Map<String, String> getContextParameters() {
			return this.contextParameters;
		}

public Jsp getJsp() {
			return this.jsp;
		}

public Session getSession() {
			return this.session;
		}

public String getServletMapping() {
			if (this.path.equals("") || this.path.equals("/")) {
				return "/";
			}
			if (this.path.contains("*")) {
				return this.path;
			}
			if (this.path.endsWith("/")) {
				return this.path + "*";
			}
			return this.path + "/*";
		}

public String getPath(String path) {
			String prefix = getServletPrefix();
			if (!path.startsWith("/")) {
				path = "/" + path;
			}
			return prefix + path;
		}

public String getServletPrefix() {
			String result = this.path;
			int index = result.indexOf('*');
			if (index != -1) {
				result = result.substring(0, index);
			}
			if (result.endsWith("/")) {
				result = result.substring(0, result.length() - 1);
			}
			return result;
		}

public String[] getPathsArray(Collection<String> paths) {
			String[] result = new String[paths.size()];
			int i = 0;
			for (String path : paths) {
				result[i++] = getPath(path);
			}
			return result;
		}

public String[] getPathsArray(String[] paths) {
			String[] result = new String[paths.length];
			int i = 0;
			for (String path : paths) {
				result[i++] = getPath(path);
			}
			return result;
		}

}

/**
	 * Tomcat properties.
	 */
	public static class Tomcat {

/**
		 * Access log configuration.
		 */
		private final Accesslog accesslog = new Accesslog();

/**
		 * Regular expression matching trusted IP addresses.
		 */
		private String internalProxies = "10\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}|" // 10/8
				+ "192\\.168\\.\\d{1,3}\\.\\d{1,3}|" // 192.168/16
				+ "169\\.254\\.\\d{1,3}\\.\\d{1,3}|" // 169.254/16
				+ "127\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}|" // 127/8
				+ "172\\.1[6-9]{1}\\.\\d{1,3}\\.\\d{1,3}|" // 172.16/12
				+ "172\\.2[0-9]{1}\\.\\d{1,3}\\.\\d{1,3}|"
				+ "172\\.3[0-1]{1}\\.\\d{1,3}\\.\\d{1,3}";

/**
		 * Header that holds the incoming protocol, usually named "X-Forwarded-Proto".
		 */
		private String protocolHeader;

/**
		 * Value of the protocol header indicating whether the incoming request uses SSL.
		 */
		private String protocolHeaderHttpsValue = "https";

/**
		 * Name of the HTTP header used to override the original port value.
		 */
		private String portHeader = "X-Forwarded-Port";

/**
		 * Name of the HTTP header from which the remote IP is extracted. For instance,
		 * `X-FORWARDED-FOR`.
		 */
		private String remoteIpHeader;

/**
		 * Tomcat base directory. If not specified, a temporary directory is used.
		 */
		private File basedir;

/**
		 * Delay between the invocation of backgroundProcess methods. If a duration suffix
		 * is not specified, seconds will be used.
		 */
		@DurationUnit(ChronoUnit.SECONDS)
		private Duration backgroundProcessorDelay = Duration.ofSeconds(30);

/**
		 * Maximum number of worker threads.
		 */
		private int maxThreads = 0;

/**
		 * Minimum number of worker threads.
		 */
		private int minSpareThreads = 0;

/**
		 * Maximum size, in bytes, of the HTTP post content.
		 */
		private int maxHttpPostSize = 0;

/**
		 * Maximum size, in bytes, of the HTTP message header.
		 */
		private int maxHttpHeaderSize = 0;

/**
		 * Whether requests to the context root should be redirected by appending a / to
		 * the path.
		 */
		private Boolean redirectContextRoot;

/**
		 * Whether HTTP 1.1 and later location headers generated by a call to sendRedirect
		 * will use relative or absolute redirects.
		 */
		private Boolean useRelativeRedirects;

/**
		 * Character encoding to use to decode the URI.
		 */
		private Charset uriEncoding;

/**
		 * Maximum number of connections that the server accepts and processes at any
		 * given time. Once the limit has been reached, the operating system may still
		 * accept connections based on the "acceptCount" property.
		 */
		private int maxConnections = 0;

/**
		 * Maximum queue length for incoming connection requests when all possible request
		 * processing threads are in use.
		 */
		private int acceptCount = 0;

/**
		 * Comma-separated list of additional patterns that match jars to ignore for TLD
		 * scanning. The special '?' and '*' characters can be used in the pattern to
		 * match one and only one character and zero or more characters respectively.
		 */
		private List<String> additionalTldSkipPatterns = new ArrayList<>();

/**
		 * Static resource configuration.
		 */
		private final Resource resource = new Resource();

public int getMaxThreads() {
			return this.maxThreads;
		}

public void setMaxThreads(int maxThreads) {
			this.maxThreads = maxThreads;
		}

public int getMinSpareThreads() {
			return this.minSpareThreads;
		}

public void setMinSpareThreads(int minSpareThreads) {
			this.minSpareThreads = minSpareThreads;
		}

public int getMaxHttpPostSize() {
			return this.maxHttpPostSize;
		}

public void setMaxHttpPostSize(int maxHttpPostSize) {
			this.maxHttpPostSize = maxHttpPostSize;
		}

public Accesslog getAccesslog() {
			return this.accesslog;
		}

public Duration getBackgroundProcessorDelay() {
			return this.backgroundProcessorDelay;
		}

public void setBackgroundProcessorDelay(Duration backgroundProcessorDelay) {
			this.backgroundProcessorDelay = backgroundProcessorDelay;
		}

public File getBasedir() {
			return this.basedir;
		}

public void setBasedir(File basedir) {
			this.basedir = basedir;
		}

public String getInternalProxies() {
			return this.internalProxies;
		}

public void setInternalProxies(String internalProxies) {
			this.internalProxies = internalProxies;
		}

public String getProtocolHeader() {
			return this.protocolHeader;
		}

public void setProtocolHeader(String protocolHeader) {
			this.protocolHeader = protocolHeader;
		}

public String getProtocolHeaderHttpsValue() {
			return this.protocolHeaderHttpsValue;
		}

public void setProtocolHeaderHttpsValue(String protocolHeaderHttpsValue) {
			this.protocolHeaderHttpsValue = protocolHeaderHttpsValue;
		}

public String getPortHeader() {
			return this.portHeader;
		}

public void setPortHeader(String portHeader) {
			this.portHeader = portHeader;
		}

public Boolean getRedirectContextRoot() {
			return this.redirectContextRoot;
		}

public void setRedirectContextRoot(Boolean redirectContextRoot) {
			this.redirectContextRoot = redirectContextRoot;
		}

public Boolean getUseRelativeRedirects() {
			return this.useRelativeRedirects;
		}

public void setUseRelativeRedirects(Boolean useRelativeRedirects) {
			this.useRelativeRedirects = useRelativeRedirects;
		}

public String getRemoteIpHeader() {
			return this.remoteIpHeader;
		}

public void setRemoteIpHeader(String remoteIpHeader) {
			this.remoteIpHeader = remoteIpHeader;
		}

public Charset getUriEncoding() {
			return this.uriEncoding;
		}

public void setUriEncoding(Charset uriEncoding) {
			this.uriEncoding = uriEncoding;
		}

public int getMaxConnections() {
			return this.maxConnections;
		}

public void setMaxConnections(int maxConnections) {
			this.maxConnections = maxConnections;
		}

public int getMaxHttpHeaderSize() {
			return this.maxHttpHeaderSize;
		}

public void setMaxHttpHeaderSize(int maxHttpHeaderSize) {
			this.maxHttpHeaderSize = maxHttpHeaderSize;
		}

public int getAcceptCount() {
			return this.acceptCount;
		}

public void setAcceptCount(int acceptCount) {
			this.acceptCount = acceptCount;
		}

public List<String> getAdditionalTldSkipPatterns() {
			return this.additionalTldSkipPatterns;
		}

public void setAdditionalTldSkipPatterns(List<String> additionalTldSkipPatterns) {
			this.additionalTldSkipPatterns = additionalTldSkipPatterns;
		}

public Resource getResource() {
			return this.resource;
		}

/**
		 * Tomcat access log properties.
		 */
		public static class Accesslog {

/**
			 * Enable access log.
			 */
			private boolean enabled = false;

/**
			 * Format pattern for access logs.
			 */
			private String pattern = "common";

/**
			 * Directory in which log files are created. Can be absolute or relative to
			 * the Tomcat base dir.
			 */
			private String directory = "logs";

/**
			 * Log file name prefix.
			 */
			protected String prefix = "access_log";

/**
			 * Log file name suffix.
			 */
			private String suffix = ".log";

/**
			 * Whether to enable access log rotation.
			 */
			private boolean rotate = true;

/**
			 * Whether to defer inclusion of the date stamp in the file name until rotate
			 * time.
			 */
			private boolean renameOnRotate;

/**
			 * Date format to place in the log file name.
			 */
			private String fileDateFormat = ".yyyy-MM-dd";

/**
			 * Set request attributes for the IP address, Hostname, protocol, and port
			 * used for the request.
			 */
			private boolean requestAttributesEnabled;

/**
			 * Whether to buffer output such that it is flushed only periodically.
			 */
			private boolean buffered = true;

public boolean isEnabled() {
				return this.enabled;
			}

public void setEnabled(boolean enabled) {
				this.enabled = enabled;
			}

public String getPattern() {
				return this.pattern;
			}

public void setPattern(String pattern) {
				this.pattern = pattern;
			}

public String getDirectory() {
				return this.directory;
			}

public void setDirectory(String directory) {
				this.directory = directory;
			}

public String getPrefix() {
				return this.prefix;
			}

public void setPrefix(String prefix) {
				this.prefix = prefix;
			}

public String getSuffix() {
				return this.suffix;
			}

public void setSuffix(String suffix) {
				this.suffix = suffix;
			}

public boolean isRotate() {
				return this.rotate;
			}

public void setRotate(boolean rotate) {
				this.rotate = rotate;
			}

public boolean isRenameOnRotate() {
				return this.renameOnRotate;
			}

public void setRenameOnRotate(boolean renameOnRotate) {
				this.renameOnRotate = renameOnRotate;
			}

public String getFileDateFormat() {
				return this.fileDateFormat;
			}

public void setFileDateFormat(String fileDateFormat) {
				this.fileDateFormat = fileDateFormat;
			}

public boolean isRequestAttributesEnabled() {
				return this.requestAttributesEnabled;
			}

public void setRequestAttributesEnabled(boolean requestAttributesEnabled) {
				this.requestAttributesEnabled = requestAttributesEnabled;
			}

public boolean isBuffered() {
				return this.buffered;
			}

public void setBuffered(boolean buffered) {
				this.buffered = buffered;
			}

}

/**
		 * Tomcat static resource properties.
		 */
		public static class Resource {

/**
			 * Time-to-live of the static resource cache.
			 */
			private Duration cacheTtl;

public Duration getCacheTtl() {
				return this.cacheTtl;
			}

public void setCacheTtl(Duration cacheTtl) {
				this.cacheTtl = cacheTtl;
			}

}

/**
	 * Jetty properties.
	 */
	public static class Jetty {

/**
		 * Access log configuration.
		 */
		private final Accesslog accesslog = new Accesslog();

/**
		 * Maximum size, in bytes, of the HTTP post or put content.
		 */
		private int maxHttpPostSize = 0; // bytes

/**
		 * Number of acceptor threads to use.
		 */
		private Integer acceptors;

/**
		 * Number of selector threads to use.
		 */
		private Integer selectors;

public Accesslog getAccesslog() {
			return this.accesslog;
		}

public int getMaxHttpPostSize() {
			return this.maxHttpPostSize;
		}

public void setMaxHttpPostSize(int maxHttpPostSize) {
			this.maxHttpPostSize = maxHttpPostSize;
		}

public Integer getAcceptors() {
			return this.acceptors;
		}

public void setAcceptors(Integer acceptors) {
			this.acceptors = acceptors;
		}

public Integer getSelectors() {
			return this.selectors;
		}

public void setSelectors(Integer selectors) {
			this.selectors = selectors;
		}

/**
		 * Jetty access log properties.
		 */
		public static class Accesslog {

/**
			 * Enable access log.
			 */
			private boolean enabled = false;

/**
			 * Log filename. If not specified, logs redirect to "System.err".
			 */
			private String filename;

/**
			 * Date format to place in log file name.
			 */
			private String fileDateFormat;

/**
			 * Number of days before rotated log files are deleted.
			 */
			private int retentionPeriod = 31; // no days

/**
			 * Append to log.
			 */
			private boolean append;

/**
			 * Enable extended NCSA format.
			 */
			private boolean extendedFormat;

/**
			 * Timestamp format of the request log.
			 */
			private String dateFormat = "dd/MMM/yyyy:HH:mm:ss Z";

/**
			 * Locale of the request log.
			 */
			private Locale locale;

/**
			 * Timezone of the request log.
			 */
			private TimeZone timeZone = TimeZone.getTimeZone("GMT");

/**
			 * Enable logging of the request cookies.
			 */
			private boolean logCookies;

/**
			 * Enable logging of the request hostname.
			 */
			private boolean logServer;

/**
			 * Enable logging of request processing time.
			 */
			private boolean logLatency;

public boolean isEnabled() {
				return this.enabled;
			}

public void setEnabled(boolean enabled) {
				this.enabled = enabled;
			}

public String getFilename() {
				return this.filename;
			}

public void setFilename(String filename) {
				this.filename = filename;
			}

public String getFileDateFormat() {
				return this.fileDateFormat;
			}

public void setFileDateFormat(String fileDateFormat) {
				this.fileDateFormat = fileDateFormat;
			}

public int getRetentionPeriod() {
				return this.retentionPeriod;
			}

public void setRetentionPeriod(int retentionPeriod) {
				this.retentionPeriod = retentionPeriod;
			}

public boolean isAppend() {
				return this.append;
			}

public void setAppend(boolean append) {
				this.append = append;
			}

public boolean isExtendedFormat() {
				return this.extendedFormat;
			}

public void setExtendedFormat(boolean extendedFormat) {
				this.extendedFormat = extendedFormat;
			}

public String getDateFormat() {
				return this.dateFormat;
			}

public void setDateFormat(String dateFormat) {
				this.dateFormat = dateFormat;
			}

public Locale getLocale() {
				return this.locale;
			}

public void setLocale(Locale locale) {
				this.locale = locale;
			}

public TimeZone getTimeZone() {
				return this.timeZone;
			}

public void setTimeZone(TimeZone timeZone) {
				this.timeZone = timeZone;
			}

public boolean isLogCookies() {
				return this.logCookies;
			}

public void setLogCookies(boolean logCookies) {
				this.logCookies = logCookies;
			}

public boolean isLogServer() {
				return this.logServer;
			}

public void setLogServer(boolean logServer) {
				this.logServer = logServer;
			}

public boolean isLogLatency() {
				return this.logLatency;
			}

public void setLogLatency(boolean logLatency) {
				this.logLatency = logLatency;
			}
		}

}

/**
	 * Undertow properties.
	 */
	public static class Undertow {

/**
		 * Maximum size, in bytes, of the HTTP post content.
		 */
		private long maxHttpPostSize = 0; // bytes

/**
		 * Size of each buffer, in bytes.
		 */
		private Integer bufferSize;

/**
		 * Number of I/O threads to create for the worker.
		 */
		private Integer ioThreads;

/**
		 * Number of worker threads.
		 */
		private Integer workerThreads;

/**
		 * Whether to allocate buffers outside the Java heap.
		 */
		private Boolean directBuffers;

/**
		 * Whether servlet filters should be initialized on startup.
		 */
		private boolean eagerFilterInit = true;

private final Accesslog accesslog = new Accesslog();

public long getMaxHttpPostSize() {
			return this.maxHttpPostSize;
		}

public void setMaxHttpPostSize(long maxHttpPostSize) {
			this.maxHttpPostSize = maxHttpPostSize;
		}

public Integer getBufferSize() {
			return this.bufferSize;
		}

public void setBufferSize(Integer bufferSize) {
			this.bufferSize = bufferSize;
		}

public Integer getIoThreads() {
			return this.ioThreads;
		}

public void setIoThreads(Integer ioThreads) {
			this.ioThreads = ioThreads;
		}

public Integer getWorkerThreads() {
			return this.workerThreads;
		}

public void setWorkerThreads(Integer workerThreads) {
			this.workerThreads = workerThreads;
		}

public Boolean getDirectBuffers() {
			return this.directBuffers;
		}

public void setDirectBuffers(Boolean directBuffers) {
			this.directBuffers = directBuffers;
		}

public boolean isEagerFilterInit() {
			return this.eagerFilterInit;
		}

public void setEagerFilterInit(boolean eagerFilterInit) {
			this.eagerFilterInit = eagerFilterInit;
		}

public Accesslog getAccesslog() {
			return this.accesslog;
		}

/**
		 * Undertow access log properties.
		 */
		public static class Accesslog {

/**
			 * Whether to enable the access log.
			 */
			private boolean enabled = false;

/**
			 * Format pattern for access logs.
			 */
			private String pattern = "common";

/**
			 * Log file name prefix.
			 */
			protected String prefix = "access_log.";

/**
			 * Log file name suffix.
			 */
			private String suffix = "log";

/**
			 * Undertow access log directory.
			 */
			private File dir = new File("logs");

/**
			 * Whether to enable access log rotation.
			 */
			private boolean rotate = true;

public boolean isEnabled() {
				return this.enabled;
			}

public void setEnabled(boolean enabled) {
				this.enabled = enabled;
			}

public String getPattern() {
				return this.pattern;
			}

public void setPattern(String pattern) {
				this.pattern = pattern;
			}

public String getPrefix() {
				return this.prefix;
			}

public void setPrefix(String prefix) {
				this.prefix = prefix;
			}

public String getSuffix() {
				return this.suffix;
			}

public void setSuffix(String suffix) {
				this.suffix = suffix;
			}

public File getDir() {
				return this.dir;
			}

public void setDir(File dir) {
				this.dir = dir;
			}

public boolean isRotate() {
				return this.rotate;
			}

public void setRotate(boolean rotate) {
				this.rotate = rotate;
			}

}

```

-  @ConfigurationProperties(prefix = "server", ignoreUnknownFields = true)
> 表示配置属性是server开头 忽略不知道的属性

## 演示项目地址,欢迎fork和star
>  码云：[SpringBootLearn](https://gitee.com/bgt0314/SpringBootLearn)
# 最后
- [SpringBoot 2.0 系列001 -- 入门介绍以及相关概念](https://blog.csdn.net/u014042066/article/details/80271073)
- [SpringBoot 2.0 系列002 --运行流程分析](https://blog.csdn.net/u014042066/article/details/80311954)
- [SpringBoot 2.0 系列003 -- 自定义Parent](https://blog.csdn.net/u014042066/article/details/80321856)
- [SpringBoot 2.0 系列004 -- 启动实战之配置文件](https://blog.csdn.net/u014042066/article/details/80336467)
- [SpringBoot 2.0 系列005 -- 启动实战之SpringApplication应用](https://blog.csdn.net/u014042066/article/details/80353282)
- [SpringBoot 2.0 系列006 -- 启动实战之注解使用](https://blog.csdn.net/u014042066/article/details/80366042https://blog.csdn.net/u014042066/article/details/80366042)

- 作者ricky
 - 交流群：244930845

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