利用AJAX实现的用户唯一性检验
我利用的框架是WEBWORK框架表现层：jsp
<%@ page language="java" pageEncoding="UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
<head>
<title>用户唯一性校验</title>
<script type="text/javascript">
//定义一个变量用于存放XMLHttpRequest对象
var xmlHttp;
//该函数用于创建一个XMLHttpRequest对象
function createXMLHttpRequest(){
if(window.ActiveXObject){
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}else if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
}
}
//这是一个 启动AJAX异步 通信的方法
function beginCheck(){
var userName = document.all.userName.value;
if(userName == ""){//如果尚未输入注册名
alert("对不起，请你输入注册名！");
return ;
}
//创建一个XMLHttpRequest对象
createXMLHttpRequest();
//将状态触发器绑定到一个函数
xmlHttp.onreadystatechange = processor;
//通过GET方法向指定的URL建立服务器的调用
xmlHttp.open("GET","/checkUser.action?userName="+userName+"&password=123456");
//发送请求
xmlHttp.send(null);
}
//这是一个用来处理状态改变的函数
function processor(){
//定义一个变量用于存放从服务器返回的响应结果
var responseContext;
if(xmlHttp.readyState == 4){//如果响应完成
if(xmlHttp.status == 200){//如果返回成功
//取出服务器的响应内容
responseContext = xmlHttp.responseText;
alert(responseContext);
//如果注册名检查有效
if(responseContext.indexOf("true")!=-1){
alert("恭喜你，该注册名有效！");
}else{
alert("对不起，该注册名已被使用！");
}
}
}
}
</script>
</head>
<body>
<form action="checkUser.action" name="userNameForm">
请输入用户名：
<input name="userName" type="text" id="userName">
<input type="button" name="userNameCheck"value="有效性检查">
</form>
</body>
</html>
控制层Action
package com.dicorp.ajax.ajax_web.actions;
import javax.servlet.http.HttpServletRequest;
import com.opensymphony.webwork.RequestUtils;
import com.opensymphony.webwork.ServletActionContext;
import com.opensymphony.xwork.Action;
import com.opensymphony.xwork.ActionContext;
import com.sun.corba.se.spi.servicecontext.ServiceContext;
public class CheckUserAction implements Action {
private String password;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
private String userName;
private String responseContext;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String execute() throws Exception {
System.out.println("***********************"+this.userName);
String[] login = {"admin","users","yin"};
String userName = this.userName;
String password = this.password;
String responseContext = "true";
for(int i = 0 ; i < login.length;i++){
if(userName.equals(login)){
responseContext = "false";
}
}
System.out.println("&&&&&&&&&&&&&&&&&&&&&&&&&"+responseContext+"*******"+password);
ActionContext serviceContext = ActionContext.getContext();
/* serviceContext.getSession().put("responseContext", responseContext);
serviceContext.getSession().put("password", password);*/
serviceContext.put("responseContext",responseContext);
serviceContext.put("password", password);
return SUCCESS;
}
public String getResponseContext() {
return responseContext;
}
public void setResponseContext(String responseContext) {
this.responseContext = responseContext;
}
}
xwork.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork 1.1.1//EN" "http://www.opensymphony.com/xwork/xwork-1.1.1.dtd">
<xwork>
<include file="webwork-default.xml" />
<package name="com.di.xiao" extends="webwork-default">
<!-- checkuser -->
<action name="checkUser" class="com.dicorp.ajax.ajax_web.actions.CheckUserAction">
<result name="success" type="dispatcher">
/jsp/checkuser/result.jsp
</result>
</action>
</xwork>
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