package com.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class CheckUser
*/
public class CheckUser extends HttpServlet {
private static final long serialVersionUID = 1L;
public CheckUser() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
response.setContentType("text/html;charset=utf-8");
username = new String(username.getBytes("iso8859-1"),"utf-8");
boolean ok = false;
if(username.length() < 6){
ok = false;
}else{
ok = true;
}
PrintWriter out = response.getWriter();
if(ok){
out.print(username+"合法");
}else{
out.print(username+"不合法");
}
out.flush();
out.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
[xhtml] view plaincopy
<!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>用户登录(处理中文乱码)</title>
<mce:script type="text/javascript"><!--
function check(v){
var xmlHttp;
if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
if(xmlHttp.overrideMimeType){
xmlHttp.overrideMimeType("text/html");
}
}else if(window.ActiveXObject){
var name = ["MSXML2.XMLHTTP","Mirosoft.XMLHTTP"];
for(var i = 0;i<activeNames.length;i++){
try{
xmlHttpRequest = new ActiveXObject(activeNames[i]);
break;
}catch(e){
}
}
}
xmlHttp.open("GET","CheckUser?username="+encodeURI(document.getElementById("username").value),true);
//发送请求
xmlHttp.send(null);
xmlHttp.onreadystatechange = function(){
if(xmlHttp.readyState == 4){
if(xmlHttp.status == 200){
document.getElementById("uinfo").innerHTML = xmlHttp.responseText;
}
}
};
}
// --></mce:script>
</head>
<body>
<form action="">
<table>
<tr>
<td>userName：</td>
<td><input width='200' id='username' onblur="check(this);"><span id='uinfo'></span></td>
</tr>
<tr>
<td>password：</td>
<td><input width='200' type="password"></td>
</tr>
<tr>
<td><input type='button' value="login"></td>
<td><input type='button' value="submit"></td>
</tr>
</table>
</form>
</body>
</html>