Struts2中Action接收参数的方法

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:
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<?xml version="1.0" encoding="UTF-8"?>
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<web-app version="2.5" 
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xmlns="http://java.sun.com/xml/ns/javaee" 
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee ;
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http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
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<welcome-file-list>
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<welcome-file>hello.jsp</welcome-file>
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</welcome-file-list>
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<filter>
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<filter-name>struts2</filter-name>
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<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
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</filter>
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<filter-mapping>
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<filter-name>struts2</filter-name>
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<url-pattern>/*</url-pattern>
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</filter-mapping>
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</web-app>


struts.xml:
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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE struts PUBLIC
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"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
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"http://struts.apache.org/dtds/struts-2.0.dtd">
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<struts>
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<!-- 
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<constant name="struts.enable.DynamicMethodInvocation" value="false" />
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<constant name="struts.devMode" value="false" />
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<include file="example.xml"/>
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13.
 
14.
 
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<package name="default" namespace="/" extends="struts-default">
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<default-action-ref name="index" />
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<action name="index">
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<result type="redirectAction">
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<param name="actionName">HelloWorld</param>
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<param name="namespace">/example</param>
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</result>
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</action>
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</package>
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-->
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<!-- Add packages here -->
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<constant name="struts.devMode" value="true" />
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<package name="user" namespace="/" extends="struts-default">
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<action name="user*" class="cn.edu.ahau.mgc.struts2.action.UserAction{1}">
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<result>/addSuccess.jsp</result>
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</action>
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</package>
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</struts>


User.java:
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package cn.edu.ahau.mgc.struts2.mode;
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public class User {
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private String userName;
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private String password;
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public String getUserName() {
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return this.userName;
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}
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public void setUserName(String userName) {
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this.userName = userName;
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}
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public String getPassword() {
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return this.password;
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}
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public void setPassword(String password) {
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this.password = password;
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}
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}


UserAction1.java:
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package cn.edu.ahau.mgc.struts2.action;
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import com.opensymphony.xwork2.ActionSupport;
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public class UserAction1 extends ActionSupport {
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private String userName;
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private String password;
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public String add() {
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System.out.println("userName: " + userName);
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System.out.println("password: " + password);
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return SUCCESS;
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}
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public String getUserName() {
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return this.userName;
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}
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public void setUserName(String userName) {
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this.userName = userName;
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}
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public String getPassword() {
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return this.password;
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}
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public void setPassword(String password) {
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this.password = password;
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}
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}



UserAction2.java:
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package cn.edu.ahau.mgc.struts2.action;
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import com.opensymphony.xwork2.ActionSupport;
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import cn.edu.ahau.mgc.struts2.mode.User;
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public class UserAction2 extends ActionSupport {
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private User user;
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public String add() {
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System.out.println("userName: " + user.getUserName());
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System.out.println("password: " + user.getPassword());
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return SUCCESS;
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}
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public User getUser() {
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return this.user;
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}
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public void setUser(User user) {
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this.user = user;
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}
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}



UserAction3.java:
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package cn.edu.ahau.mgc.struts2.action;
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import cn.edu.ahau.mgc.struts2.mode.User;
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import com.opensymphony.xwork2.ActionSupport;
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import com.opensymphony.xwork2.ModelDriven;
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public class UserAction3 extends ActionSupport implements ModelDriven<User> {
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private User user = new User();
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public String add() {
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System.out.println("userName: " + user.getUserName());
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System.out.print("password: " + user.getPassword());
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return SUCCESS;
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}
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public User getModel() {
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return this.user;
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}
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}


index.jsp:
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<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
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<%
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String path = request.getContextPath();
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
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%>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<base href="<%=basePath%>">
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<title>Param</title>
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<meta http-equiv="pragma" content="no-cache">
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<meta http-equiv="cache-control" content="no-cache">
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<meta http-equiv="expires" content="0">    
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
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<meta http-equiv="description" content="This is my page">
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<!--
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<link rel="stylesheet" type="text/css" href="styles.css">
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-->
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</head>
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<body>
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<a href="user1!add?userName=Magci&password=123456">user1!add?userName=Magci&password=123456</a>
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<br />
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<br />
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<a href="user2!add?user.userName=MGC&user.password=abc">user2!add?user.userName=MGC&user.password=abc</a>
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<br />
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<br />
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<a href="user3!add?userName=MaGC&password=000000">user3!add?userName=MaGC&password=000000</a>
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</body>
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</html>


addSuccess.jsp:
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<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
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<%
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String path = request.getContextPath();
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
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%>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<base href="<%=basePath%>">
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<title>AddSuccess</title>
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<meta http-equiv="pragma" content="no-cache">
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<meta http-equiv="cache-control" content="no-cache">
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<meta http-equiv="expires" content="0">    
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
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<meta http-equiv="description" content="This is my page">
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<!--
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<link rel="stylesheet" type="text/css" href="styles.css">
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-->
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</head>
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<body>
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User Add Success! <br>
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</body>
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</html>