ajax例子（Java） 示例①

功能描述：向后台传2个参数，后台取到参数后进行查询，然后返回一个值给前台，再由前台处理

 

前台代码：

 

var rightinfo = "";
$.ajax({ 
	url:'<%=path%>/am060402checkRoomIdDup.action',
	type:'post', //数据发送方式 
	data: ("newId="+ newId + "&oldId="+ oldId),
	dataType:'json',//接受数据格式 
		async: false ,
		success: function(data){
			rightinfo = data;
		}
});
//当 rightinfo为“1”时表示当前房间编号没有重复
if(rightinfo == 1){"//此处添加对应处理事件}"}
if(rightinfo == 0){"//此处添加对应处理事件"}

 后台代码：

public String checkIdDup() throws SQLException, IOException {
	ActionContext context = ActionContext.getContext();   
	HttpServletRequest request = (HttpServletRequest)context.get(ServletActionContext.HTTP_REQUEST); 
	HttpServletResponse response = (HttpServletResponse)context.get(ServletActionContext.HTTP_RESPONSE);   
	request.setCharacterEncoding("UTF-8");
	response.setCharacterEncoding("UTF-8");
	PrintWriter out = getResponse().getWriter();
	String oldId= request.getParameter("oldId");
	String newId= request.getParameter("newId");
	//此处添加：处理对应前台传值过来的查询或者其他操作
	if("条件1"){out.print("1")}
	if("条件2"){out.print("0")}
	out.close();
return null;
}