# sy_spring

**Repository Path**: siyit/sy_spring

## Basic Information

- **Project Name**: sy_spring
- **Description**: Spring 核心原理
- **Primary Language**: Java
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-03-30
- **Last Updated**: 2022-06-07

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# 手写 Spring 核心原理

## 传统 SSM

回顾一下传统的 SSM 项目，方便我们更好的理解。 

简单搭建一个 SSM 项目：

目录结构：

![img.png](img/img.png)

**搭建步骤：**

1. 创建一个 maven web项目。

    略
   

2. 添加 pom.xml 依赖
   ```xml
     <properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
       <maven.compiler.source>1.8</maven.compiler.source>
       <maven.compiler.target>1.8</maven.compiler.target>
       <spring.version>5.0.2.RELEASE</spring.version>
       <slf4j.version>1.6.6</slf4j.version>
     </properties>
   
     <dependencies>
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-webmvc</artifactId>
         <version>${spring.version}</version>
       </dependency>
     </dependencies>
   ```
3. 创建 ApplicalitionContext.xml 配置文件
   
   ```xml
    <context:component-scan base-package="run.siyuan" />
   ```

4. 配置 web.xml
   
   ```xml
      <web-app>
         <display-name>Archetype Created Web Application</display-name>
         <servlet>
            <servlet-name>dispatcherService</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
               <param-name>contextConfigLocation</param-name>
               <param-value>classpath:ApplicationContext.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
         </servlet>
         <servlet-mapping>
            <servlet-name>dispatcherService</servlet-name>
            <url-pattern>/</url-pattern>
         </servlet-mapping>
      </web-app>

   ```

5. 业务编码
   ```java
      @Controller
      @ResponseBody
      @RequestMapping("ssm")
      public class SsmController {
      
          @Autowired
          private SsmService ssmService;
      
          @RequestMapping(value = "test",method = RequestMethod.GET)
          public Object ssmTest(){
              System.out.println("ssm-test");
              return ssmService.getList();
          }
      
      }
   
      public interface SsmService {
          Object getList();
      }
   
      @Service
      public class SsmServiceImpl implements SsmService {
      
          @Override
          public Object getList() {
              return "Query database";
          }
      }
   ```
   
**测试**

![img.png](img/test_img.png)