SSM框架项目搭建系列(五)—Spring之Bean的注解注入

applicationContext.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.xsd">   //扫描com.ssm包下所有带注解的    <context:component-scan base-package="com.ssm"/></beans>

//实体类 HelloWorld
HelloWorld.java

package com.ssm.beans;import org.springframework.stereotype.Component;/** * DateTime: 2016/11/2 10:03 * 功能： * 思路： */@Component("helloWorld")public class HelloWorld {    private String username;    private String password;    public HelloWorld(){    }    //public HelloWorld(final String username,final String password){    //    this.username=username;this.password=password;    //}    public void show(){        System.out.println("username:"+username+"  password:"+password);    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}

//DAO层，主要与数据库打交道，此处并没有真正的插入数据库，但操作原理体现出来了。

HelloWorldDAO.java

package com.ssm.DAO;import com.ssm.beans.HelloWorld;import org.springframework.stereotype.Repository;/** * DateTime: 2016/11/2 19:55 * 功能： * 思路： */@Repository("daoSupport")public class HelloWorldDAO {    public Object save(final HelloWorld helloWorld) throws Exception {        System.out.println("向数据库中插入:"+helloWorld.getUsername()+"..."+helloWorld.getPassword());        HelloWorld helloWorld1=new HelloWorld();        //为了测试 将传入的数据加工，比如传入aaa,则返回aaaaaa        helloWorld1.setUsername("new"+helloWorld.getUsername());        helloWorld1.setPassword("new"+helloWorld.getPassword());        return helloWorld1;    }}

//service层，与DAO层打交道，并将值返回给Controller

HelloWorldService.java

package com.ssm.service;import com.ssm.DAO.HelloWorldDAO;import com.ssm.beans.HelloWorld;import org.springframework.stereotype.Service;import javax.annotation.Resource;/** * DateTime: 2016/11/2 19:53 * 功能： * 思路： */@Service("helloWorldService")public class HelloWorldService {    @Resource(name = "daoSupport")    private HelloWorldDAO helloWorldDAO;    public HelloWorld save(final HelloWorld helloWorld) throws Exception {        return (HelloWorld) helloWorldDAO.save(helloWorld);    }}

//测试，这里没有使用Controller，所以直接查找helloWorldService

package com.ssm.test;import com.ssm.beans.HelloWorld;import com.ssm.service.HelloWorldService;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * DateTime: 2016/11/2 12:49 * 功能： * 思路： */public class HelloWorldTest {    public static void main(String[] args) throws Exception {        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");        HelloWorldService service=(HelloWorldService)applicationContext.getBean("helloWorldService");        HelloWorld helloWorld1 = (HelloWorld) applicationContext.getBean("helloWorld");        helloWorld1.setUsername("YEN");        helloWorld1.setPassword("MY");        HelloWorld result=service.save(helloWorld1);        System.out.println("返回的数据");        result.show();    }}