struts.xml :
<?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>
<package name="default" extends="struts-default">
<action name="check" class="controller.UserAction" method="check">
<result name="check" type="stream">
<param name="inputName">inputStream</param>
<param name="contentType">text/html</param>
</result>
</action>
</package>
</struts>
check方法只是走形式,使用流向前台发送数据,控制层自定义流,方法名字一定要是getInputStream:
package controller;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import service.UserService;
import vo.User;
public class UserAction {
private User user;
private UserService us = new UserService();
public String check(){
return "check";
}
public InputStream getInputStream() throws UnsupportedEncodingException{
String count = us.checkAccount(user.getAccount()) + "";
ByteArrayInputStream bai = new ByteArrayInputStream(count.getBytes("utf-8"));
return bai;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
前台ajax:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript" src="jquery-1.8.3.js"></script>
<script type="text/javascript" src="jquery.validate.js"></script>
<script type="text/javascript" src="messages_zh.js"></script>
<script type="text/javascript">
jQuery.validator.addMethod("checkAccount",function(value){
var flag = false;
$.ajax({
url:"check.action",
data:{"user.account":value},
async:false,
success:function(data){
if (data == "0"){
flag = true;
}
},
error:function(e){
alert(e.status());
}
});
return flag;
},"用户存在");
$(function() {
$("#form1").validate({
rules : {
"user.account" : {
required : true,
checkAccount:true
},
"user.psw" : {
required : true
},
"psw2" : {
required : true
}
}
});
});
</script>
</head>
<body>
<form action="reg.action" method="post" id="form1">
鐢ㄦ埛鍚?锛?input name="user.account" type="text" /><br> 瀵嗙爜 锛?input
name="user.psw" type="password" /><br> 閲嶅瀵嗙爜锛?input name="psw2"
type="password" /><br> <input value="娉ㄥ唽" type="submit">
</form>
</body>
</html>