# java-spring-study

**Repository Path**: cqjtu_admin/java-spring-study

## Basic Information

- **Project Name**: java-spring-study
- **Description**: spring 相关练习
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-04-19
- **Last Updated**: 2022-10-07

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# java-spring-study

#### Spring介绍 
 ##### 文档地址https://docs.spring.io/spring-framework/docs/current/reference/html/core.html#spring-core
 1.1 maven 配置
  ```xml
  <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.3.5</version>
</dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.3.5</version>
 </dependency>
  ```
1.2 优点
  * Spring 是一个开源的免费的框架（容器）！
  * Spring 是一个轻量级的、非入侵式的框架！
  * 控制反转（IOC）、面向切面编程（AOP）
  * 支持事务的处理，对框架整合的支持
#### IOC控制反转
#####  最初实现方法
###### 若增加新的实现接口则必须在业务逻辑层修改
```java
 private UserDao userDao = new UserDaoImpl();
    @Override
    public void getUser() {
        userDao.getUser();
    }
```
##### 通过Set注入方法实现 则只需在调用的地方修改即可 无需修改业务逻辑
```java
public class UserServiceImpl implements UserService {
    private UserDao userDao ;
    @Override
    public void getUser() {
        this.userDao.getUser();
    }
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }
```
```java
public class MyTest {
    public static void main(String[] args) {
        UserServiceImpl userService = new UserServiceImpl() ;
        userService.setUserDao(new UserMysqlDaoImpl());
        userService.getUser();
    }
```

#### 改成spring容器的时候 只需要更改xml文件 即可实现上面的功能
##### bean文件配置如下
```xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="dao" class="xukai.dao.UserDaoImpl"></bean>
    <bean id="userService" class="xukai.service.UserServiceImpl">
        <property name="userDao" ref="dao"></property>
<!--        <constructor-arg index="0" value=""></constructor-arg>-->
    </bean>

</beans>
```
##### 代码实现文件
```java
 ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
       UserServiceImpl userService = (UserServiceImpl) applicationContext.getBean("userService");
       userService.getUser();
```
#### Spring的配置
#### IOC创建对象的方式
#### 以来注入
#### Bean的自动装配
#### 使用注解
#### 使用java的方式配置Spring
JavaConfig

#### 静态代理
#### AOP
#### 注解实现AOP