struts2 action 接收参数

原帖：
http://mgc.ahau.edu.cn/article.asp?id=779

Struts2中Action接收参数的方法主要有以下三种：
1.使用Action的属性接收参数：
    a.定义：在Action类中定义属性，创建get和set方法；
    b.接收：通过属性接收参数，如：userName；
    c.发送：使用属性名传递参数，如：user1!add?userName=Magci；
2.使用DomainModel接收参数：
    a.定义：定义Model类，在Action中定义Model类的对象（不需要new），创建该对象的get和set方法；
    b.接收：通过对象的属性接收参数，如：user.getUserName()；
    c.发送：使用对象的属性传递参数，如：user2!add?user.userName=MGC；
3.使用ModelDriven接收参数：
    a.定义：Action实现ModelDriven泛型接口，定义Model类的对象（必须new），通过getModel方法返回该对象；
    b.接收：通过对象的属性接收参数，如：user.getUserName()；
    c.发送：直接使用属性名传递参数，如：user2!add?userName=MGC；

实例：

web.xml:
view sourceprint?01.<?xml version="1.0" encoding="UTF-8"?>
02.<web-app version="2.5"
03.   
xmlns="http://java.sun.com/xml/ns/javaee"
04.   
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
05.   
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee ;
06.   
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
07. 
<welcome-file-list>
08.   
<welcome-file>hello.jsp</welcome-file>
09. 
</welcome-file-list>
10. 
<filter>
11.   
<filter-name>struts2</filter-name>
12.   
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
13. 
</filter>
14. 
<filter-mapping>
15.   
<filter-name>struts2</filter-name>
16.   
<url-pattern>/*</url-pattern>
17. 
</filter-mapping>
18.</web-app>

struts.xml:
view sourceprint?01.<?xml version="1.0" encoding="UTF-8" ?>
02.<!DOCTYPE struts PUBLIC
03.   
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
04.   
"http://struts.apache.org/dtds/struts-2.0.dtd">
05.

06.<struts>
07.   
<!-- 
08.   
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
09.   
<constant name="struts.devMode" value="false" />
10.

11.   
<include file="example.xml"/>
12.

13.

14.

15.   
<package name="default" namespace="/" extends="struts-default">
16.       
<default-action-ref name="index" />
17.       
<action name="index">
18.           
<result type="redirectAction">
19.               
<param name="actionName">HelloWorld</param>
20.               
<param name="namespace">/example</param>
21.           
</result>
22.       
</action>
23.   
</package>
24.    
-->
25.

26.   
<!-- Add packages here -->
27.   
<constant name="struts.devMode" value="true" />
28.    
<package name="user" namespace="/" extends="struts-default">
29.       
<action name="user*" class="cn.edu.ahau.mgc.struts2.action.UserAction{1}">
30.           
<result>/addSuccess.jsp</result>
31.       
</action>
32.   
</package>
33.</struts>

User.java:
view sourceprint?01.package cn.edu.ahau.mgc.struts2.mode;
02.

03.public class User {
04.

05.   
private String userName;
06.   
private String password;
07.    

08.   
public String getUserName() {
09.       
return this.userName;
10.   
}
11.    

12.   
public void setUserName(String userName) {
13.       
this.userName = userName;
14.   
}
15.    

16.   
public String getPassword() {
17.       
return this.password;
18.   
}
19.    

20.   
public void setPassword(String password) {
21.       
this.password = password;
22.   
}
23.}

UserAction1.java:
view sourceprint?01.package cn.edu.ahau.mgc.struts2.action;
02.

03.import com.opensymphony.xwork2.ActionSupport;
04.

05.public class UserAction1 extends ActionSupport {
06.

07.   
private String userName;
08.   
private String password;
09.    

10.   
public String add() {
11.       
System.out.println("userName: " + userName);
12.       
System.out.println("password: " + password);
13.       
return SUCCESS;
14.   
}
15.    

16.   
public String getUserName() {
17.       
return this.userName;
18.   
}
19.    

20.   
public void setUserName(String userName) {
21.       
this.userName = userName;
22.   
}
23.    

24.   
public String getPassword() {
25.       
return this.password;
26.   
}
27.    

28.   
public void setPassword(String password) {
29.       
this.password = password;
30.   
}
31.}


UserAction2.java:
view sourceprint?01.package cn.edu.ahau.mgc.struts2.action;
02.

03.import com.opensymphony.xwork2.ActionSupport;
04.

05.import cn.edu.ahau.mgc.struts2.mode.User;
06.

07.public class UserAction2 extends ActionSupport {
08.    

09.   
private User user;
10.    

11.   
public String add() {
12.       
System.out.println("userName: " + user.getUserName());
13.       
System.out.println("password: " + user.getPassword());
14.       
return SUCCESS;
15.   
}
16.    

17.   
public User getUser() {
18.       
return this.user;
19.   
}
20.    

21.   
public void setUser(User user) {
22.       
this.user = user;
23.   
}
24.    

25.}


UserAction3.java:
view sourceprint?01.package cn.edu.ahau.mgc.struts2.action;
02.

03.import cn.edu.ahau.mgc.struts2.mode.User;
04.

05.import com.opensymphony.xwork2.ActionSupport;
06.import com.opensymphony.xwork2.ModelDriven;
07.

08.public class UserAction3 extends ActionSupport implements ModelDriven<User> {
09.

10.   
private User user = new User();
11.    

12.   
public String add() {
13.       
System.out.println("userName: " + user.getUserName());
14.       
System.out.print("password: " + user.getPassword());
15.       
return SUCCESS;
16.   
}
17.

18.   
public User getModel() {
19.       
return this.user;
20.   
}
21.    

22.}

index.jsp:
view sourceprint?01.<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
02.<%
03.String path = request.getContextPath();
04.String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
05.%>
06.

07.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
08.<html>
09. 
<head>
10.   
<base href="<%=basePath%>">
11.    

12.   
<title>Param</title>
13.   
<meta http-equiv="pragma" content="no-cache">
14.   
<meta http-equiv="cache-control" content="no-cache">
15.   
<meta http-equiv="expires" content="0">    
16.   
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17.   
<meta http-equiv="description" content="This is my page">
18.   
<!--
19.   
<link rel="stylesheet" type="text/css" href="styles.css">
20.   
-->
21. 
</head>
22.  

23. 
<body>
24.   
<a href="user1!add?userName=Magci&password=123456">user1!add?userName=Magci&password=123456</a>
25.   
<br />
26.   
<br />
27.    

28.   
<a href="user2!add?user.userName=MGC&user.password=abc">user2!add?user.userName=MGC&user.password=abc</a>
29.   
<br />
30.   
<br />
31.    

32.   
<a href="user3!add?userName=MaGC&password=000000">user3!add?userName=MaGC&password=000000</a>
33. 
</body>
34.</html>

addSuccess.jsp:
view sourceprint?01.<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
02.<%
03.String path = request.getContextPath();
04.String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
05.%>
06.

07.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
08.<html>
09. 
<head>
10.   
<base href="<%=basePath%>">
11.    

12.   
<title>AddSuccess</title>
13.   
<meta http-equiv="pragma" content="no-cache">
14.   
<meta http-equiv="cache-control" content="no-cache">
15.   
<meta http-equiv="expires" content="0">    
16.   
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17.   
<meta http-equiv="description" content="This is my page">
18.   
<!--
19.   
<link rel="stylesheet" type="text/css" href="styles.css">
20.   
-->
21. 
</head>
22.  

23. 
<body>
24.   
User Add Success! <br>
25. 
</body>
26.</html>