For Servlet and Ajax interactions, the solution of status = parsererror is always reported. ajaxparsererror

For Servlet and Ajax interactions, the solution of status = parsererror is always reported. ajaxparsererror

Cause: the data returned by the servlet is not in Json format.

1. JS code:

Var jsonStr = {'clusternum': 2, 'iterationnum': 3, 'runtimes ': 4}; $. ajax ({type: "post", // http: // 172.22.12.135: 9000/Json. json url: "/LSHome", dataType: 'json', data: jsonStr, success: function (data, textStatus) {if (textStatus = "success ") {alert ("task creation succeeded" + data) ;}, error: function (xhr, status, errMsg) {alert ("task creation failed! ");}});

2. Note that the above url is/LSHome (the project name is LSHome). Therefore, in the web. xml file, configure the Servlet as follows:

<servlet>   <servlet-name>LSHomeServlet</servlet-name>   <servlet-class>com.ys.servlet.LSHomeServlet</servlet-class> </servlet> <servlet-mapping>   <servlet-name>LSHomeServlet</servlet-name> <url-pattern>/LSHome</url-pattern>

3. The Servlet code is:

Protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// number of clusters String clusterNum = request. getParameter ("clusterNum"); // number of iterations String iterationNum = request. getParameter ("iterationNum"); // Number of running times String runTimes = request. getParameter ("runTimes"); System. out. println ("cluster quantity:" + clusterNum + "--- iterations:" + iterationNum + "--- running times:" + runTimes); PrintWriter out = response. getWriter (); out. write ("success"); out. close ();}

4. The result is always an error in the ajax method, and status = parsererror

xhr = Object {readyState: 4, responseText: "success", status: 200, statusText: "OK"}

5. solution:

The reason is that the data returned by the response object is incorrectly formatted and the correct method is used.

 PrintWriter out = response.getWriter();String jsonStr = "{\"success\":\"OK\"}"; out.write(jsonStr);

You can splice the returned values into JSON data format, and then whether status = parsererror is reported.

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