What should I do if the jquery $.post method does not execute?

The solution to the problem that the jquery $.post method is not executed: Set the returned data to json data, and the code is [out.print(JSONObject.fromObject(result));].

The operating environment of this tutorial: windows7 system, jquery3.2.1 version. This method is suitable for all brands of computers.

Solution to the problem that the jquery $.post method does not execute:

About the problem that JQuery’s post callback function does not execute

The front-end post callback function is No execution, after setting the breakpoint debug or directly skip the execution

Error demonstration:

Background code

@RequestMapping(value = "login")
public void CheckUserAccount(@RequestParam("account")String account, HttpServletResponse response) throws IOException{
JSONObject json_account = JSONObject.fromObject(account);
int username = (Integer)json_account.get("username");
String password = json_account.getString("password");
logger.info("username = " + username + " password = " + password);
int status;
status = checkUserAccountService.IsCorrect(username, password);
Map<String, Object> result = new HashMap<String, Object>();
Map<String, String> info_json = new HashMap<String, String>();
if(status == 1){
info_json.put("status", "success");
}else if(status == 0){
info_json.put("status", "errorpassword");
}else{
info_json.put("status", "noexitaccount");
}
result.put("info", info_json);
JSONObject json_object = JSONObject.fromObject(result);
response.setContentType("text/json; charset=utf-8");
response.setHeader("Cache-Control", "no-cache");
PrintWriter out = response.getWriter();
out.print(result);
out.flush();
out.close();
logger.info("验证结果是" + ((Map<String, String>)(result.get("info"))).get("status"));

The key sentence is:

response.setContentType("text/json; charset=utf-8");

The data returned here is set to json data, but out.print(result);The output here is A Map, so the front end cannot recognize any data. As a result, the callback function is skipped and not executed (because the callback function only executes json data)

Correct demonstration:

Change to: out .print(JSONObject.fromObject(result));

is fine.

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