Spring13 - 自动注入@Autowired

@Autowired注入

单独使用@Autowired注解,默认根据类型装配。【默认是byType】

查看源码:

package org.springframework.beans.factory.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.CONSTRUCTOR, ElementType.METHOD, ElementType.PARAMETER, ElementType.FIELD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Autowired {
    boolean required() default true;
}

源码中有两处需要注意:

  • 第一处:该注解可以标注在哪里?

    • 构造方法上
    • 方法上
    • 形参上
    • 属性上
    • 注解上
  • 第二处:该注解有一个required属性,默认值是true,表示在注入的时候要求被注入的Bean必须是存在的,如果不存在则报错。如果required属性设置为false,表示注入的Bean存在或者不存在都没关系,存在的话就注入,不存在的话,也不报错。

①场景一:属性注入

创建UserDao接口

package com.atguigu.spring6.dao;

public interface UserDao {

    public void print();
}

创建UserDaoImpl实现

package com.atguigu.spring6.dao.impl;

import com.atguigu.spring6.dao.UserDao;
import org.springframework.stereotype.Repository;

@Repository
public class UserDaoImpl implements UserDao {

    @Override
    public void print() {
        System.out.println("Dao层执行结束");
    }
}

创建UserService接口

package com.atguigu.spring6.service;

public interface UserService {

    public void out();
}

创建UserServiceImpl实现类

package com.atguigu.spring6.service.impl;

import com.atguigu.spring6.dao.UserDao;
import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

创建UserController类

package com.atguigu.spring6.controller;

import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    public void out() {
        userService.out();
        System.out.println("Controller层执行结束。");
    }

}

测试一

package com.atguigu.spring6.bean;

import com.atguigu.spring6.controller.UserController;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class UserTest {

    private Logger logger = LoggerFactory.getLogger(UserTest.class);

    @Test
    public void testAnnotation(){
        ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
        UserController userController = context.getBean("userController", UserController.class);
        userController.out();
        logger.info("执行成功");
    }


}

测试结果:

image-20221101153556681

以上构造方法和setter方法都没有提供,经过测试,仍然可以注入成功。

②场景二:set注入

修改UserServiceImpl类

package com.atguigu.spring6.service.impl;

import com.atguigu.spring6.dao.UserDao;
import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    private UserDao userDao;

    @Autowired
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

修改UserController类

package com.atguigu.spring6.controller;

import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

@Controller
public class UserController {

    private UserService userService;

    @Autowired
    public void setUserService(UserService userService) {
        this.userService = userService;
    }

    public void out() {
        userService.out();
        System.out.println("Controller层执行结束。");
    }

}

测试:成功调用

③场景三:构造方法注入

修改UserServiceImpl类

package com.atguigu.spring6.service.impl;

import com.atguigu.spring6.dao.UserDao;
import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    private UserDao userDao;

    @Autowired
    public UserServiceImpl(UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

修改UserController类

package com.atguigu.spring6.controller;

import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

@Controller
public class UserController {

    private UserService userService;

    @Autowired
    public UserController(UserService userService) {
        this.userService = userService;
    }

    public void out() {
        userService.out();
        System.out.println("Controller层执行结束。");
    }

}

测试:成功调用

④场景四:形参上注入

修改UserServiceImpl类

package com.atguigu.spring6.service.impl;

import com.atguigu.spring6.dao.UserDao;
import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    private UserDao userDao;

    public UserServiceImpl(@Autowired UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

修改UserController类

package com.atguigu.spring6.controller;

import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

@Controller
public class UserController {

    private UserService userService;

    public UserController(@Autowired UserService userService) {
        this.userService = userService;
    }

    public void out() {
        userService.out();
        System.out.println("Controller层执行结束。");
    }

}

测试:成功调用

⑤场景五:只有一个有参构造函数,注解可以省略

修改UserServiceImpl类

package com.atguigu.spring6.service.impl;

import com.atguigu.spring6.dao.UserDao;
import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    public UserServiceImpl(UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

测试通过

当有参数的构造方法只有一个时,@Autowired注解可以省略。

说明:有多个构造方法时呢?大家可以测试(再添加一个无参构造函数),测试报错

⑥场景六:@Autowired注解和@Qualifier注解联合

添加dao层实现

package com.atguigu.spring6.dao.impl;

import com.atguigu.spring6.dao.UserDao;
import org.springframework.stereotype.Repository;

@Repository
public class UserDaoRedisImpl implements UserDao {

    @Override
    public void print() {
        System.out.println("Redis Dao层执行结束");
    }
}

测试:测试异常

错误信息中说:不能装配,UserDao这个Bean的数量等于2

怎么解决这个问题呢?当然要byName,根据名称进行装配了。

修改UserServiceImpl类

package com.atguigu.spring6.service.impl;

import com.atguigu.spring6.dao.UserDao;
import com.atguigu.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    @Qualifier("userDaoImpl") // 指定bean的名字
    private UserDao userDao;

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

总结

  • @Autowired注解可以出现在:属性上、构造方法上、构造方法的参数上、setter方法上。
  • 当带参数的构造方法只有一个,@Autowired注解可以省略。()
  • @Autowired注解默认根据类型注入。如果要根据名称注入的话,需要配合@Qualifier注解一起使用。
posted @   LaViez  阅读(108)  评论(0编辑  收藏  举报
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