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第一次尝试ajax，第一次尝试SSH。收货颇丰。
最主要还是发现javascript还是比较严谨的语言，一个字母的错误，一个大小写的错误，
都能让自己抓狂。比如：.readyState==4-------》.readystate==4。
XML、和json格式待续。。。。。
把自己的主要代码贴一下：
ajax：
<script type="text/javascript" language="javascript" charset="utf-8">
var http_request;
function sendRequest(){
var u=document.getElementById("username").value;
//var u=document.getElementsByTagName("username").value ;
if(window.ActiveXObject){
http_request=new ActiveXObject("Microsoft.XMLHTTP");
}else{
http_request=new XMLHttpRequest();
}
window.alert(http_request);
if(http_request){
var url="check.action";
http_request.open("post",url,true);
http_request.setRequestHeader(‘Content-type‘,‘application/x-www-form-urlencoded‘);
http_request.onreadystatechange=chuli;
http_request.send("username="+u);
window.alert(u);
}
}
function chuli(){
if(http_request.readyState==4){
window.alert(http_request.readyState);
if(http_request.status==200){
var req=http_request.responseText;
window.alert(req);
if(req=="fail"){
//提示该用户名不可用
document.getElementById("myreq").value="该用户不存在";
}else{
document.getElementById("myreq").value="恭喜，用户名存在";
}
}
}
}
</script>
JSP页面：
<div> <form action="@@" method="post" id="myform"> <input type="text" name="username" id="username" />用户名??: <input type="text" name="password" /> 密码?: <input type="button" value="检验" onclick="sendRequest();"/> <input type="text" name="valid" id="myreq"/> </form> <br/> 用户名??: <input type="text" name="username2" /> 用户密码:<input type="password" name="password2"><br> 电子邮件:<input type="text" name="email"><br/> <input type="submit" value="用户注册"/> </div>
struts.xml:
<action name="check" class="checkNameAction"> </action>
applicationContext.xml:
<bean id="checkNameAction" class="com.action.user.CheckNameAction" scope="prototype"> <property name="service"> <ref bean="userService"></ref> </property> </bean>
CheckNameAction.java:
public String execute() throws Exception { username=ServletActionContext.getRequest().getParameter("username") ; if (this.service.checkUser(username)) { HttpServletResponse response = ServletActionContext.getResponse(); response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); out.print("success"); } else { HttpServletResponse response = ServletActionContext.getResponse(); response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); out.print("fail"); //将信息写入response } return null; }
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原文地址：http://www.cnblogs.com/skyball/p/4574103.html
