Ajax (部分一)自己做的，总结页面向后台传Form值、单个值和后台向前台传一个或是一组值

public void testAjax(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws IOException {
response.setContentType("application/json;charset=gb2312");
PrintWriter out = response.getWriter();
String username=request.getParameter("username");
String password=request.getParameter("password");
//声明对象，向前台传值类似于map，前台通过：
//var myobj=transport.responseText.evalJSON(true);
//var isTrue=myobj.isTrue(键的名字);
// 的到传过的值
JSONObject jsonObject=new JSONObject();

jsonObject.put("isTrue",false);
if(username=="aa"||password=="aa"){
jsonObject.put("isTrue",true);
out.print(jsonObject.toString());
out.flush();
out.close();
return;
}else{
jsonObject.put("isTrue",false);
out.print(jsonObject.toString());
out.flush();
out.close();
return;
}
}

(向页面传单个值)
public void testAjax(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws IOException {
response.setContentType("application/json;charset=gb2312");
PrintWriter out = response.getWriter();
String username=request.getParameter("username");
String password=request.getParameter("password");

if(username=="aa"||password=="aa"){
out.print(true);
out.flush();
out.close();
return;
}else{
out.print(false);
out.flush();
out.close();
return;
}
}

function getStByKsKm(id,name){
var par="id="+id+"&name="+name;

new Ajax.Request(//声明ajax对象
//调用方法名
'qxfp.do?method=getStByKsKm',
{

//*******传递单个少数几个值，用URL传递********
method:'get',//提交方式
method:'get',//提交方式

//*****传递多个值，用post方式********
method:'post',//提交方式
postBody: $('form1').serialize(),//序列化表单，即为发送表单做准备

onSuccess:function(response){//成功后执行的方法

//********成功以后用JSONObject得到后台传入的多个值*********
//得到后台的返回的JSONObject对象
var myobj=response.responseText.evalJSON(true);
//myobj的istrue字段中存储着结果
if(!myobj.istrue){
alert(myobj.errormessage);
return;

//********成功以后用得到后台传入的单个值*********
var result=response.responseText;
//result中存储着是后台的out.print();返回的值
if(result){
alert(myobj.errormessage);
return;

}}
}
}
);
}