Spring uses javaconfig to implement the method and steps of configuration

Do not use the XML configuration of spring, and leave it to java!

Javaconfig is a sub project of spring. After spring 4, it is called the core function of spring!

Entity class:

package com.lrx.poji;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
//说明这个类被Spring注册到了容器中
@Component
public class User {
 @Value("lixin")
 private String name;

 public String getName() {
   return name;
 }

 public void setName(String name) {
   this.name = name;
 }

 @Override
 public String toString() {
   return "User{" +
       "name='" + name + '\'' +
       '}';
 }
}

Profile:

package com.lrx.config;

import com.lrx.poji.User;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

//这个也会被spring容器托管,因为它本来就是一个@Component
// @Configuration代表一个类，就和我们之前的ApplicationContext.xml是一样的
@Configuration
@ComponentScan("com.lrx.poji")
public class LiConfig {
  //注册一个bean，就相当于xml写的一个bean标签
  //这个方法的名字就相当于bean标签中的ID属性
  //方法的返回值相当于bean标签中的class属性
  @Bean
  public User getUser(){
    return new User();  //就是要注入到bean的对象
  }
}

Test class:

import com.lrx.config.LiConfig;
import com.lrx.poji.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class MyTest {
  public static void main(String[] args) {
    //如果完全使用了配置类方式去做，我们就只能通过AnnotationConfig上下文来获取容器
    // 然后通过配置类的class对象来加载！
    ApplicationContext context=new AnnotationConfigApplicationContext(LiConfig.class);
    User getUser= (User) context.getBean("user");
    System.out.println(getUser.getName());
  }
}

This pure Java configuration can be seen everywhere in spring boot!

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