注入对象的三种方法

 

package com.edu.spring.mvcbean;

import com.sun.org.apache.bcel.internal.generic.JSR;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

import java.lang.annotation.Inherited;

import javax.annotation.Resource;
import javax.inject.Inject;

import jdk.nashorn.internal.objects.annotations.Getter;
import jdk.nashorn.internal.objects.annotations.Setter;

/**
 * @param
 * @return
 * @throws
 */
@Service
public class UserService
{

    @Autowired  //方法一：使用spring原生的Autowired  
    @Qualifier(value = "createUserDao2")
    private  UserDao userDao;


    @Resource  //JSR 250 提供的注入能力
    @Qualifier(value = "createUserDao2")
    private  UserDao userDao1;


    @Inject  //使用javaX 注入（需要导Pom依赖）
    @Qualifier(value = "createUserDao2")
    private  UserDao userDao2;

    private  void show(){
        System.out.println("UserService...userDao");
    }

    @Override
    public String toString()
    {
        return "UserService{" +
                "userDao=" + userDao +
                ", userDao1=" + userDao1 +
                ", userDao2=" + userDao2 +
                '}';
    }
}