struts action接收list对象

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说明：struts2的action接收List<Object>。

有javabean:User，如下：

public class User {
// Fields

private Integer id;
private String username;
private String password;
public Integer getId() {
   return id;
}

// Default Constructor
public User() {

}

// mini Constructor
public User(Integer id) {
   this.id = id;
}

// Property accessors

public void setId(Integer 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;
}

@Override
public String toString() {
   return username+","+password;
}
}

Action类：UserAction，如下：

public class UserAction extends ActionSupport {
private User user;
private List<User> userList;

public List<User> getUserList() {
return userList;
}

public void setUserList(List<User> userList) {
this.userList = userList;
}

public User getUser() {
return user;
}

public void setUser(User user) {
   this.user = user;
}

/**
* 批量修改User。
* @return
*/
public String addUser() {
   for(User user2:userList) {
    System.out.println(user2.toString());
   }
   return SUCCESS;
}
}

JSP页面：user.jsp，如下：

<%@ page language="java" contentType="text/html;"
    pageEncoding="utf-8"%>
<%@taglib uri="/struts-tags"　prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>修改用户</title>
</head>
<body>
<s:form action="updateUser.action" method="post">
<table>
   <tr>
    <td>
     用户名
    </td>
    <td>
     密码
    </td>
   </tr>
   <s:iterator value="userList" status="stat">
    <tr>
     <td>
      <s:textfield name="userList[%{#stat.index}].username"></s:textfield>
     </td>
     <td>
      <s:password name="userList[%{#stat.index}].password"></s:password>
     </td>
    </tr>
   </s:iterator>
</table>
</s:form>
</body>
</html>