通过springframework注解，设置属性值和调用方法

通过springframework注解，设置属性值和调用方法

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
">
    <context:component-scan base-package="com.msb.controller" ></context:component-scan>

</beans>

package com.msb.controller.service.impl;

import com.msb.controller.dao.Impl.UserDaoImplA;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
@NoArgsConstructor
@Data
@Service
@AllArgsConstructor
//@Autowired只要写一次对应的扫描包下的实体类都进行自动加载其属性
public class UserServiceImpl implements UerService {
    @Autowired
    /*@Qualifier("UserDaoImplA")这里可以指定加载谁的属性，如不指定全部加载*/
    @Value("小明")
    private String name;
    @Value("男")
    private String gender;
    @Value("12")
    public Integer age;
    @Override
    public void add() {
        System.out.println("UserServiceImpl");
    }
}

//这是一个接口，多个类共调一个接口
package com.msb.controller.service.impl;

import org.springframework.stereotype.Service;

@Service
public interface UerService {
    void add();
}

package com.msb.controller.dao.Impl;

import com.msb.controller.dao.UserDao;
import com.msb.controller.service.impl.UerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Repository;

@Repository
public class UserDaoImplA implements UerService {
    private String name;
    @Override
    public void add() {
        System.out.println("userFirstImplA");
    }
}

package com.msb.controller.dao.Impl;

import com.msb.controller.dao.UserDao;
import com.msb.controller.service.impl.UerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Repository;
@Repository
public class UserDaoImplB implements UerService {
    @Value("UserDaoImplB")
    private String name;
    @Override
    public void add() {
        System.out.println("userFirstImplB");
    }
}