这是一个登陆注册的小例子，问题好像出在json，或者在向数据库请求数据的过程中有问题，反正就是返不回来相关的信息
比如如果用户名密码输入错误应该返回一句话，这句话我在login实体类方法中定义了，可就是回不来
2015我跪求各位，为我解惑
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<%
String path = request.getContextPath();
%>
<!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>Insert title here</title>
<script type="text/javascript" src="<%=path %>/js/jquery-1.8.2.min.js"></script>
<script type="text/javascript">
function doLogin(type){
var name = $("#loginName").attr('value');
var pw = $("#loginPassword").attr('value');
var url = 'login.action?user.username= '+name+' &user.password= '+pw;
//alert("执行");
if(name!=null && name!='' && pw!=null && pw!=''){
$.ajax({
url:url,
type:"post",
dataType:"json",
async:true,
beforeSend:function(data){
$("#loginButton").attr("disabled",true);
},
success:function(data){
alert(data);
if(data.user!=null){
$("#msg").html(" <br/>");
var html="欢迎 "+data.user.username+" nbsp;<label><input type='button' name='search' value='退出' onclik='document.location=\"logout.action\"'></label>";
$("#topLoginDiv").html(html);
}else{
$("#msg").html(data.msg);
$("#msg").css("color","red");
}
$("#loginButton").attr("disabled",false);
}
});
}else{
alert("请输入用户名或密码！");
}
}
</script>
</head>
<body>
<div id="header" class="wrad">
<div id="logo">*****</div>
</div>
<div align="right" style="display: inline">
<div id="topLoginDiv">
用户名：
<s:textfield name="user.name" id="loginName" required="true"
size="15" />
密 码：
<s:password name="user.password" id="loginPassword" required="true"
size="15" />
<label class="ui-green"><input type="button" name="loginButton" id="loginButton" value="登陆" onclick="doLogin()" />
</label>
<label class="ui-green"><input type="button"
name="loginButton" id="loginButton" value="注册"
onclick='document.location="<%=path %>/pages/register.jsp"' />
</label>
<label class="ui-green"><input type="button" name="search"
value="发布信息" /></label>
</div>
<div id="msg"></div>
</div>
</body>
</html>
====================struts 2的
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />
<constant name="struts.ui.theme" value="simple" /><!-- 设置常量改变前台页面的输出格式 -->
<package name="house-json" namespace="/" extends="json-default">
<action name="login" class="com.pb.web.action.UserAction" method="login">
<result type="json"></result>
<result name="login" type="json"></result>
</action>
</package>
</struts>
=================Action的
public class UserAction extends BaseAction {
private IUserServiceImpl service=new IUserServiceImpl();
private HouseUser user;
private String msg;
public String login(){
if (user!=null) {
Map<String,Object> map=service.login(user);
user=(HouseUser)map.get(user);
if (user!=null) {
session.put(Constant.LOGIN_USER,user);
msg="true";
return SUCCESS;
}else {
msg=(String)map.get(msg);
}
}
return LOGIN;
}
public HouseUser getUser() {
return user;
}
public void setUser(HouseUser user) {
this.user = user;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
=========================login实体类方法的
public class IUserServiceImpl implements IUserService {
private IUserDao dao = new UserDaoimpl();
public Map<String, Object> login(HouseUser user) {
Map<String,Object> map=new HashMap<String, Object>();
List list = dao.findByProperty("HouseUser", "user", user.getUsername());
if (list != null && list.size() > 0) {
HouseUser loginUser = (HouseUser) list.get(0);
if (user.getPassword() != null
&& user.getPassword().trim().equals(loginUser.getPassword())) {
map.put("user",loginUser);
}else {
map.put("msg","用户名或密码不正确");
}
}else {
map.put("msg","用户名不存在");
}
return map;
}
@Override
public boolean doRegister(HouseUser user) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean validate(String name) {
// TODO Auto-generated method stub
return false;
}
@Override
public HouseUser getUserById(Integer id) {
// TODO Auto-generated method stub
return null;
}
}
================这是调用的 findByProperty 方法
public List<T> findByProperty(String classname, String propertyName,Object value) {
try {
String queryString = "from "+ classname +" as u where u." + propertyName
+ "= ?";
Query queryObject = getSession().createQuery(queryString);
queryObject.setParameter(0, value);
Iterator it=queryObject.iterate();
while (it.hasNext()) {
HouseUser hu=(HouseUser) it.next();
System.out.println(hu.getId()+" "+hu.getUsername());
}
return queryObject.list();
} catch (RuntimeException re){
throw re;
} finally {
closeSession();
}
//return null;
}
------解决思路----------------------
太长了 关键代码给出来先 20分要读这么一大堆代码。。。
------解决思路----------------------
你应该把你需要返回的数据渲染成为json格式之后返回给前台，拿你的Map来举例子吧
String json=convert2Json(map);
Printer print=response.getPrinter();
print.out(json);
pring.close()
大概就是这样的了渲染成Json,你可以使用第三方开源的，比如说json-lib,fastJson,或者是Gson
------解决思路----------------------
打错了，是
Writer out = response.getWriter();