控制器：

package action;

import vo.User;
import com.opensymphony.xwork2.ActionSupport;
/**
 * 获取前台传过来的对象：使用方法，先定义一个javabean例如User类，
 * 然后把该javabean，充当Action类的属性，
 * 并且给属性提供set和get的方法
 * 前台的表单的name的属性值和等于Action类中的属性名.对应javabean中的属性名,例如：user.userName
 * 使用示例：<input type="text" name="user.userName">,<input type="password" name="user.password">
 * @author 够潮
 *
 */
public class ConvertObjectAction extends ActionSupport {

	/**
	 * 版本号
	 */
	private static final long serialVersionUID = 1L;
	/**
	 * 用户对象，用户接受前台传过来的对象
	 */
	private User user ;
	
	
	/**
	 * 获取前台传过来的对象
	 */
	public void convertObject(){
		
		
		System.out.println("用户名："+this.getUser().getUserName());
		System.out.println("密码："+this.getUser().getUserPassword());
		
		
	}
	/**
	 * 获取用户对象
	 * @return
	 */
	public User getUser() {
		return user;
	}
	/**
	 * 设置用户对象
	 * @param user
	 */
	public void setUser(User user) {
		this.user = user;
	}
	/**
	 * 获取版本号
	 * @return
	 */
	public static long getSerialVersionUID() {
		return serialVersionUID;
	}
	

}

javabean：

package vo;

/**
 * 
 * @author 够潮
 *
 */
public class User {

	/**
	 * 用户名
	 */
	private String userName;
	/**
	 * 密码
	 */
	private String userPassword;
	/**
	 * 获取用户名
	 * @return
	 */
	public String getUserName() {
		return userName;
	}
	/**
	 * 设置用户名
	 * @param userName
	 */
	public void setUserName(String userName) {
		this.userName = userName;
	}
	/**
	 * 获取密码
	 * @return
	 */
	public String getUserPassword() {
		return userPassword;
	}
	/**
	 * 设置密码
	 * @param userPassword
	 */
	public void setUserPassword(String userPassword) {
		this.userPassword = userPassword;
	}
	
}

前台页面：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>前台向后台传一个对象</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  <center>
  <h3>前台向后台传一个对象</h3>
  
  <form action="convertOject!convertObject.action">
   用戶名：<input type="text" name="user.userName"><br>
   密碼：<input type="password" name="user.userPassword"><br>
   <input type="submit" value="提交">
  </form>
  </center>
   
  </body>
</html>

配置文件：

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

	<package name="admin" namespace="/" extends="struts-default">
		
		
		<!-- ConvertObjectAction -->
		<action name="convertOject" class="action.ConvertObjectAction">
		     
		</action>

	</package>
</struts>