調(diào)用接口,無非也就是打開鏈接 讀取流 將結(jié)果以流的形式輸出

將查詢結(jié)果以json返回，無非就是將查詢到的結(jié)果轉(zhuǎn)換成jsonObject

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/***
?? ? * 將從數(shù)據(jù)中取到的結(jié)果以json的格式返回
?? ? *
?? ? * @param response
?? ? * @throws IOException
?? ? */
?? ?@RequestMapping(value = "/getJson")
?? ?public void getJson(HttpServletResponse response) throws IOException {
?? ??? ?List list = userService.getUsers();
?? ??? ?JSONArray Js = JSONArray.fromObject(list);
?? ??? ?JSONObject jsonObject = new JSONObject();
?? ??? ?jsonObject.put("msg", "success");
?? ??? ?jsonObject.put("data", Js.toString());
?? ??? ?ServletOutputStream out = response.getOutputStream();
?? ??? ?out.print(jsonObject.toString());
?? ?}

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/***
?? ? * 調(diào)用接口
?? ? * @param mm
?? ? * @param response
?? ? * @return
?? ? * @throws IOException
?? ? */
?? ?@RequestMapping(value = "/getUser")
?? ?public String getUsers(ModelMap mm, HttpServletResponse response)
?? ??? ??? ?throws IOException {
?? ??? ?String url = "http://127.0.0.1:8080/ssm/getJson";
?? ??? ?URL postUrl = new URL(url);
?? ??? ?HttpURLConnection connection = (HttpURLConnection) postUrl.openConnection();
?? ??? ?connection.setDoOutput(true);
?? ??? ?connection.setDoInput(true);
?? ??? ?connection.setRequestMethod("POST");
?? ??? ?connection.setUseCaches(false);
?? ??? ?connection.setInstanceFollowRedirects(true);
?? ??? ?connection.setRequestProperty("Content-Type",
?? ??? ??? ??? ?"application/x-www-form-urlencoded");
?? ??? ?Map<String,String> headerMap=new HashMap<String,String>();
?? ??? ?if(!headerMap.isEmpty()){
?? ??? ??? ?? for (Map.Entry<String, String> entry : headerMap.entrySet()) { ?
?? ??? ??? ??? ?? connection.setRequestProperty(entry.getKey(),entry.getValue());
?? ??? ??? ?? }
?? ?????? }
?? ??? ?connection.connect();
??????? DataOutputStream out = new DataOutputStream(connection.getOutputStream());
??????? //out.writeBytes(content);//content為方法參數(shù)
??????? out.flush();
??????? out.close(); // flush and close
??????? BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "utf-8"));
??????? String line="";
??????? line = reader.readLine();
??????? reader.close();
??????? connection.disconnect();
??????? mm.addAttribute("line", line);
??????? //mm.addAttribute("list", userService.getUsers());
?? ??? ?return "index";
?? ?}

?

?

總結(jié)

以上是生活随笔為你收集整理的json格式数据,将数据库中查询的结果转换为json, 然后调用接口的方式返回json(方式一)...的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

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