Spring(一)第一个示例

原文链接:http://www.orlion.ga/185/

一、下载与安装Spring

1、访问https://repo.spring.io/webapp/#/artifacts/browse/tree/Properties/libs-release-local/org/springframework/spring/3.2.16.RELEASE/spring-framework-3.2.16.RELEASE-dist.zip 右键download

2、eclipse中windows->proference->java->bulid path->User libraries创建一个名为Spring的user libraries，导入下载的包中lib目录下如图所示的jar包(commons-logging需要另外下载)


二、使用

创建如图所示代码结构：


UserDAO.java：

package ml.orlion.dao;

import ml.orlion.model.User;

public interface UserDAO {
public void saveUser(User user);
}

UserDAOImpl.java

package ml.orlion.dao.impl;

import ml.orlion.dao.UserDAO;
import ml.orlion.model.User;

public class UserDAOImpl implements UserDAO{

public void saveUser(User user){
System.out.println("save usering");
}
}

UserService.java

package ml.orlion.service;

import ml.orlion.dao.UserDAO;
import ml.orlion.dao.impl.UserDAOImpl;
import ml.orlion.model.User;

public class UserService {

private UserDAO userDAO = new UserDAOImpl();

public UserDAO getUserDao() {

return userDAO;
}

public void setUserDao(UserDAO userDAO) {
this.userDAO = userDAO;
}

public void saveUser(User user){
this.userDAO.saveUser(user);
}
}

User.java

package ml.orlion.model;

public class User {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}

}

beans.xml内容:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> 
<bean id="userDao" class="ml.orlion.dao.impl.UserDAOImpl">
</bean>

<bean id="userService" class="ml.orlion.service.UserService">
<property name="userDao" ref="userDao"/>
</bean>
</beans>

现在可以在代码中测试一下Spring了:

SpringTest.java

package ml.orlion.spring;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import ml.orlion.model.User;
import ml.orlion.service.UserService;

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

BeanFactory appContext = new ClassPathXmlApplicationContext("beans.xml");
UserService userService = (UserService)appContext.getBean("userService");
User u = new User();
u.setName("test");
u.setAge(1);

userService.saveUser(u);
}
}

右键运行即可在控制台看到:save usering,成功。