Spring再接触 Annotation part2

resource

resource

beans.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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd">
    <context:annotation-config />
  <bean id="u2" class="com.bjsxt.dao.impl.UserDAOImpl">
  </bean>

  <bean id="userService" class="com.bjsxt.service.UserService" >

  </bean>

</beans>

Userservice.java

package com.bjsxt.service;
import javax.annotation.Resource;

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

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

public class UserService {

    private UserDAO userDAO;  

    public void init() {
        System.out.println("init");
    }

    public void add(User user) {
        userDAO.save(user);
    }
    public UserDAO getUserDAO() {
        return userDAO;
    }

    @Resource   //默认按名字 找不到UserDao的话，名称找不到，按类型
    public void setUserDAO( UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    public void destroy() {
        System.out.println("destroy");
    }
}

test

    @Test
    public void testAdd() throws Exception {
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

        UserService service = (UserService)ctx.getBean("userService");
        service.add(new User());

        ctx.destroy();

    }

Component

userDaoimpl

package com.bjsxt.dao.impl;

import org.springframework.stereotype.Component;

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

@Component("u")
public class UserDAOImpl implements UserDAO {

    public void save(User user) {
        //Hibernate
        //JDBC
        //XML
        //NetWork
        System.out.println("user saved!");
    }

}

Userservice

package com.bjsxt.service;
import javax.annotation.Resource;

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

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

@Component("userService")
public class UserService {

    private UserDAO userDAO;  

    public void init() {
        System.out.println("init");
    }

    public void add(User user) {
        userDAO.save(user);
    }
    public UserDAO getUserDAO() {
        return userDAO;
    }

    @Resource(name="u")
    public void setUserDAO( UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    public void destroy() {
        System.out.println("destroy");
    }
}

beans.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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd">
    <context:annotation-config />
    <context:component-scan base-package="com.bjsxt"/>          //挨着盘在这下面的包找

</beans>

test

@Test
    public void testAdd() throws Exception {
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

        UserService service = (UserService)ctx.getBean("userService");
        service.add(new User());

        ctx.destroy();

    }

最后一个 PostConstruct 在方法之前  Predestroy 在小销毁之前

package com.bjsxt.service;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.annotation.Resource;

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

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

@Component("userService")
public class UserService {

    private UserDAO userDAO;  

    @PostConstruct
    public void init() {
        System.out.println("init");
    }

    public void add(User user) {
        userDAO.save(user);
    }
    public UserDAO getUserDAO() {
        return userDAO;
    }

    @Resource(name="u")
    public void setUserDAO( UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    @PreDestroy
    public void destroy() {
        System.out.println("destroy");
    }
}