Ajax------------ prototype+struts(json)

用到1: javascript框架 prototype

2:struts json插件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<constant name="struts.objectFactory" value="spring" />
<!---  注意继承的package -->
	<package name="json" extends="json-default">
		<action name="login" method="login" class="userAction">
			<result name="success" type="json"></result>
		</action>
	</package>
</struts>    

注：json-default包继承自struts-defaults

web处理

<mce:script type="text/javascript" src="script/prototype.js" mce_src="script/prototype.js"></mce:script>
<mce:script type="text/javascript"><!--
	function validateName(){
		if($F('username') == ''){
			alert("用户名不能为空");
			return false;
		}else{
			return true;
		}
	}
	
	function login() {
	
		var params = $('form').serialize();
		
		var request = new Ajax.Request("login.action", {
			method :"get",
			parameters :encodeURI(params),
			
			onSuccess : function(request) {
				// 返回的json结果
				var resJson = request.responseText.evalJSON();
				if(resJson.success){
					alert("成功处理");
				}else{
					alert(resJson.msg);
				}
			},
			
			onFailure : function(){
				alert("登陆失败,请稍后再试!");
			}
		});
}
// --></mce:script>