15、(知識篇)Spring使用Annotation配置bean02(泛型IOC)

原創

键盘侠0923

2020-02-21 05:48

//在基類中使用Autowire裝配,無需其他額外配置
//繼承基類的子類使用Spring的annotation即可

//詳情操作可見代碼

測試類：

package com.spring.test;

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

import com.spring.util.UserService;

public class Test {
	public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		
		//在基類中使用Autowire裝配,無需其他額外配置
		//繼承基類的子類使用Spring的annotation即可
		//詳情操作可見代碼
		
		
		UserService us = (UserService) ctx.getBean("userService");
		us.save();
		
		
	}
}

基類部分：

package com.spring.util;

public class SpringDao<T> {
	public void save(){
		System.out.println("save");
	}
}

package com.spring.util;

import java.lang.reflect.ParameterizedType;

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

public class SpringService<T> {
	@Autowired
	private SpringDao<T> dao;

	public void save() {

		ParameterizedType pt = (ParameterizedType) dao.getClass().getGenericSuperclass();

		System.out.println("傳入的泛型 == "+pt.getActualTypeArguments()[0]);
	}
}

子類部分：

package com.spring.util;

import org.springframework.stereotype.Component;

@Component
public class User {

}

package com.spring.util;

import org.springframework.stereotype.Repository;

@Repository
public class UserDao extends SpringDao<User>{

}

package com.spring.util;

import org.springframework.stereotype.Service;

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

applicationContext.xml部分：

<?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-4.1.xsd">

	<context:component-scan base-package="com.spring" ></context:component-scan>
</beans>