$(function(){
$.ajax({
type:"POST",
url:"queryIp.action",
dataType:"json",
async:false,
timeout:2000,
contentType: "application/json; charset=utf-8",
data:{
// startDate:$("#startDate").val().trim()&$("#endDate").val().trim();
time:new Date().getTime()
},
success:function(data)
{
var mydata=data;
alert(mydata);
},
error: function(XMLHttpRequest,textStatus,errorThrown){
alert("error:"+textStatus);
alert(XMLHttpRequest.status);
alert(XMLHttpRequest.readyState);
}
});
mydata 返回一直是个空值 是怎么回事 queryIp.action中有值
------解决方案--------------------------------------------------------
returnstr = "{returnstr:'0',returndata:" + ja + "}";//成功,返回信息
// System.out.println(ja);
return returnstr; //你这里不应该这样返回的吧,你的上一个贴子我有传代码给你看的啊
- Java code
JSONArray arr = new JSONArray(); if (channelId != null) { List<CmsTopic> list = manager.getListByChannel(channelId); JSONObject o; for (CmsTopic t : list) { o = new JSONObject(); o.put("id", t.getId()); o.put("name", t.getName()); arr.put(o); } } ResponseUtils.renderJson(response, arr.toString());
------解决方案--------------------------------------------------------
后台用response.....print(json);
将这个字符串返回
最后方法return null;
不是return 这个字符串
------解决方案--------------------------------------------------------
response.setContentType("text/html; charset=GBK");
//设置文本类型的编码格式
response.setCharacterEncoding("UTF-8");
response.setHeader("Cache-Control","no-cache");
logger.info("进入AJAX输出信息方法AJAXOutPrintString");
try {
PrintWriter out = response.getWriter();
out.write(outputString);
out.close();
} catch (IOException e) {
logger.info("Ajax输出IO异常!");
e.printStackTrace();
}
logger.info("离开AJAXOutPrintString");
酌量修改。输出记得要有,