初学一种新的技术,都是从简单的程序入手为佳.

怎么来写一个Spring的简单程序呢?

0.先将spring.jar放到构建路径中,如果是web项目的copy到lib目录下.

1.写一个java的bean,要求有一个属性对应有get,set方法的;又或者是在该bean的构造函数中设置该属性.

   前者的依赖注入方式是,set注入,后者为构造注入.

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package com.gc.action;  
 
public class HelloWorld {  
 
    public String msg = null;  
 
    public String getMsg() {  
        return msg;  
    }  
 
    public void setMsg(String msg) {  
        this.msg = msg;  
    }  
      
} 
package com.gc.action;

public class HelloWorld {

 public String msg = null;

 public String getMsg() {
  return msg;
 }

 public void setMsg(String msg) {
  this.msg = msg;
 }
 
}

或

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package com.gc.action;  
 
public class HelloWorld {  
 
    public String msg = null;  
 
    public String getMsg() {  
        return msg;  
    }  
 
    public void setMsg(String msg) {  
        this.msg = msg;  
    }  
 
    public HelloWorld(String msg) {  
          
        this.msg = msg;  
    }  
 
} 
package com.gc.action;

public class HelloWorld {

 public String msg = null;

 public String getMsg() {
  return msg;
 }

 public void setMsg(String msg) {
  this.msg = msg;
 }

 public HelloWorld(String msg) {
  
  this.msg = msg;
 }

}

2.写一配置文件config.xml

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<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"  
 "http://www.springframework.org/dtd/spring-beans.dtd"> 
   
 <beans> 
            <bean id="hello" class="com.gc.action.HelloWorld"> 
                    <property name="msg"> 
                            <value>HelloWold</value> 
                    </property> 
            </bean> 
 </beans> 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
 "http://www.springframework.org/dtd/spring-beans.dtd">
 
 <beans>
    <bean id="hello" class="com.gc.action.HelloWorld">
      <property name="msg">
        <value>HelloWold</value>
      </property>
    </bean>
 </beans>

或

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<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"  
 "http://www.springframework.org/dtd/spring-beans.dtd"> 
   
 <beans> 
            <bean id="hello" class="com.gc.action.HelloWorld"> 
                    <constructor-arg index="0"> 
                    <value>hello china </value> 
                    </constructor-arg> 
            </bean> 
 </beans> 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
 "http://www.springframework.org/dtd/spring-beans.dtd">
 
 <beans>
    <bean id="hello" class="com.gc.action.HelloWorld">
      <constructor-arg index="0">
      <value>hello china </value>
      </constructor-arg>
    </bean>
 </beans>

3.在需要的类中用配置好的bean

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package com.gc.test;  
import com.gc.action.HelloWorld;  
import org.springframework.context.ApplicationContext;  
import org.springframework.context.support.FileSystemXmlApplicationContext;  
 
 
public class TestHolloWorld {  
 
    /** 
     * @param args 
     */ 
    public static void main(String[] args) {  
        // TODO Auto-generated method stub  
 
        //HelloWorld hello = new HelloWorld();  
        //hello.setMsg("hello world");  
        //System.out.print(hello.getMsg());  
          
        ApplicationContext actx = new FileSystemXmlApplicationContext("WebRoot//config.xml");  
        HelloWorld hello = (HelloWorld) actx.getBean("hello");  
        System.out.print(hello.getMsg());  
          
    }  
 
} 
package com.gc.test;
import com.gc.action.HelloWorld;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class TestHolloWorld {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub

  //HelloWorld hello = new HelloWorld();
  //hello.setMsg("hello world");
  //System.out.print(hello.getMsg());
  
  ApplicationContext actx = new FileSystemXmlApplicationContext("WebRoot//config.xml");
  HelloWorld hello = (HelloWorld) actx.getBean("hello");
  System.out.print(hello.getMsg());
  
 }

}

发表于 @ 2009年03月18日　23:06:00