beans
package com.windvalley.beans;
public class UserInfo {
private String userName;
private String passWord;
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserName() {
return userName;
}
public void setPassWord(String passWord) {
this.passWord = passWord;
}
public String getPassWord() {
return passWord;
}
}
转换器
package com.windvalley.converter;
import java.util.Map;
import java.util.StringTokenizer;
import com.windvalley.beans.UserInfo;
import ognl.DefaultTypeConverter;
public class UserinfoConverter extends DefaultTypeConverter {
@Override
public Object convertValue(Map context, Object value, Class toType) {
// TODO Auto-generated method stub
if (UserInfo.class == toType) //页面向后台对象转换
{
String[] str = (String[])(value);
String firstValue = str[0];
StringTokenizer st = new StringTokenizer(firstValue, ";");
String userName = st.nextToken();
String passWord = st.nextToken();
UserInfo userInfo = new UserInfo();
userInfo.setUserName(userName);
userInfo.setPassWord(passWord);
return userInfo;
}
else {
return null;
}
}
}
action
package com.windvalley.struts2;
import com.opensymphony.xwork2.ActionSupport;
import com.windvalley.beans.UserInfo;
public class UserInfoAction extends ActionSupport {
private UserInfo userInfo;
public void setUserInfo(UserInfo userInfo) {
this.userInfo = userInfo;
}
public UserInfo getUserInfo() {
return userInfo;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
System.out.print(userInfo.getUserName());
System.out.print(userInfo.getPassWord());
return SUCCESS;
}
}
UserInfoAction-conversion.properties
userInfo=com.windvalley.converter.UserinfoConverter
Struct
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="struts2" extends="struts-default" namespace="/">
<action name="userinfo" class="com.windvalley.struts2.UserInfoAction" >
<result name="success">/userinfo.jsp</result>
</action>
</package>
</struts>
login.jsp
<%@ 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>Struct2 Login</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>
<form action="userinfo.action">
<h1>demo: userInfo</h1><br>
userInfo: <input type="text" name="userinfo" /> <br>
<input type="submit" value="submit">
</form>
</body>
</html>
用的dtd是2.1
报错为
java.lang.NullPointerException
com.windvalley.struts2.UserInfoAction.execute(UserInfoAction.java:25)
