SpringIOC

ioc控制反转）
=========
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:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
https://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
">

<!-- bean definitions here -->
<context:component-scan base-package="dao"/>
<context:component-scan base-package="services"/>
<context:component-scan base-package="controller"/>

<bean id="userDao" class="dao.impl.UserDaoImpl"/>
<bean id="userService" class="services.impl.UserServiceImpl"/>
<bean id="userController" class="controller.UserController"/>

<!-- bean definitions here -->

==========

UserController.java

package controller;
import Vo.UserVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Controller;
import services.UserService;
import services.impl.UserServiceImpl;

@Controller
public class UserController {
@Autowired
private UserService userService;

public UserVo getVo(Integer id, ApplicationContext context) {

return userService.getVo(id,context);
}
}

========
UserDao.java(接口)

package dao;

import entity.User;

public interface UserDao {
User getEntity(Integer id);

}

UserDaoImpl.java

package dao.impl;

import dao.UserDao;
import entity.User;
import org.springframework.stereotype.Repository;

@Repository
public class UserDaoImpl implements UserDao {
public User getEntity(Integer id) {
User user = new User();
user.setId(1);
user.setName("Anne");
user.setGender(0);
return user;
}
}
=======
User.java

package entity;

public class User {
private Integer id;
private String name;
private Integer gender;

public Integer getId()
{
return id;
}

public String getName() {
return name;
}

public Integer getGender() {
return gender;
}

public void setId(Integer id) {
this.id = id;
}
public void setName(String name){
this.name = name;
}
public void setGender(Integer gender) {
this.gender = gender;
}

}

========

UsrService.java(接口)

package services;

import Vo.UserVo;
import org.springframework.context.ApplicationContext;

public interface UserService {
UserVo getVo(Integer id, ApplicationContext context);
}

UserServiceImpl.java

package services.impl;

import Vo.UserVo;
import dao.UserDao;
import entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Service;
import services.UserService;

@Service("userService")
public class UserServiceImpl implements UserService {

@Autowired
private UserDao userDao;
public UserVo getVo(Integer id, ApplicationContext context) {
userDao = (UserDao) context.getBean("userDao");
User user = userDao.getEntity(id);
UserVo userVo = new UserVo(user);
userVo.setGenderName(userVo.getGender() == 0 ? "female" : "male");
return userVo;
}
}
======

UserVo.java
package vo;

import entity.User;

public class UserVo {
private Integer id;
private String name;
private Integer gender;
private String genderName;

public UserVo(User user) {
this.id = user.getId();
this.name = user.getName();
this.gender = user.getGender();
}

public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}
public void setName(String name){
this.name = name;
}

public String getGenderName() {
return genderName;
}
public void setGenderName(String genderName){
this.genderName = genderName;
}

public Integer getGender() {
return gender;
}

public void setGender(Integer gender) {
this.gender = gender;
}

public String toString(){
return "User{"+
"id="+id+
",name='"+name +'\''+
",genderName="+genderName +
",gender="+gender+'}';
}

}

======
测试类
UserTest.java
import Vo.UserVo;
import controller.UserController;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class UserTest {
public static void main(String[] args) {

ApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");

UserController userController = (UserController) context.getBean("userController");
UserVo userVo = userController.getVo(1,context);
System.out.println(userVo);
}
}