了解Spring set依赖注入

新建一个java项目，不是动态Web项目；就是一个简单的java项目；

创建domain模型 User.java

public class User {
private int id;
private String username;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
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;
}
}

创建lib文件夹，导入下列包，全选右键->”Build Path”->”add …”



创建上下文环境配置文件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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> 
<bean id="userManager" class="cn.com.xalead.spring.UserManager">
<property name="driverCalss">
<value>jdbc.msyql.Driver</value>
</property>
<property name="username">
<value>root</value>
</property>
<property name="password">
<value>root</value>
</property>
<property name="url">
<value>jdbc:mysql://localhost:3306</value>
</property>
</bean>

<!-- manager变量是UserAction类中的变量，引用上面的userManager"Bean"来注入其中 -->
<bean id="userAction" class="cn.com.xalead.spring.UserAction">
<property name="manager" ref="userManager" />
</bean>

</beans>

创建一个UserManager类，模拟对User对象的操作；

变量username, password, url, driveclass是模仿jdbc连接（没有具体实现连接，只是利用变量实现依赖注入的赋值操作）；

public class UserManager {
private String username;
private String password;
private String url;
private String driverCalss;

public void setUsername(String username) {
this.username = username;
}
public void setPassword(String password) {
this.password = password;
}
public void setUrl(String url) {
this.url = url;
}
public void setDriverCalss(String driverCalss) {
this.driverCalss = driverCalss;
}

public void add(User user){
System.out.println(username);
System.out.println("执行添加User对象的操作!");
}
}

创建一个UserAction类，类似MVC三层架构中的controller

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;

public class UserAction{
private UserManager manager = null;
public void setManager(UserManager manager) {
this.manager = manager;
}

public String execute(){
User user = new User();
manager.add(user);
return "success";
}
}

测试

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

public class MainClass {

public static void main(String[] args) {
BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");
//      BeanFactory factory = new ClassPathXmlApplicationContext("app*.xml");

UserAction ua = (UserAction)factory.getBean("userAction");
System.out.println(ua.execute());

}

}

测试结果：