介绍泛型依赖注入

关键代码:

public class BaseService<T> {
	
	// 在父类建立引用
	@Autowired
	protected BaseRepository<T> repository;

	public void add(){
		System.out.println(repository);
		System.out.println("BaseService add");
	}
}

详细:

BaseService.java:

package com.shuoeasy.test;

import org.springframework.beans.factory.annotation.Autowired;

public class BaseService<T> {
	
	// 在父类建立引用
	@Autowired
	protected BaseRepository<T> repository;

	public void add(){
		System.out.println(repository);
		System.out.println("BaseService add");
	}
}

UserService.java:

package com.shuoeasy.test;

import org.springframework.stereotype.Service;

@Service
public class UserService extends BaseService<User>{
}

User.java:

package com.shuoeasy.test;

import org.springframework.stereotype.Component;

@Component
public class User {
	private int id;
	private String name;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + "]";
	}
}

bean.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"
	xmlns:p="http://www.springframework.org/schema/p"
	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-4.2.xsd">
	
	<context:component-scan 
		base-package="com.shuoeasy.test">
	</context:component-scan>
</beans>

Main.java:

package com.shuoeasy.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

	public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml");
		
		UserService userService = (UserService) ctx.getBean("userService");
		userService.add();
	}
}

输出:

com.shuoeasy.test.UserRepository@4a1ab1c1

BaseService add


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