之前遇到一個問題，如果是get方法，

我可以很簡單的構(gòu)造強制鏈接結(jié)構(gòu)
/function/{userId}

或是參數(shù)結(jié)構(gòu)
/function?userId=123

@RequestMapping("/function")
@ResponseBody
public String function(@RequestParam("userId") String userId){
  return "result";
}

然后就可以
get方法調(diào)試很簡單，在網(wǎng)頁中請求就完成了，如果是POST怎么辦？

本文將介紹一個使用java代碼發(fā)送POST請求的方式：

class A{
  String a;
  String b;
  //省略getter，setter
    ...
}
@RequestMapping(value = "/functionPost", method = RequestMethod.POST)
    @ResponseBody
    public String functionPost(@RequestBody A a) {
        return "result";
    }

@ResponseBody

@Test
    public void jsonPost() {
        String strURL = "http://localhost:8080/newBsCard";
        try {
            URL url = new URL(strURL);// 創(chuàng)建連接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setUseCaches(false);
            connection.setInstanceFollowRedirects(true);
            connection.setRequestMethod("POST"); // 設(shè)置請求方式
            connection.setRequestProperty("Accept", "application/json"); // 設(shè)置接收數(shù)據(jù)的格式
            connection.setRequestProperty("Content-Type", "application/json;charset=utf-8"); // 設(shè)置發(fā)送數(shù)據(jù)的格式
            connection.connect();
            OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream(), "UTF-8"); // utf-8編碼
            A bean = new A();
           
            bean.setA("23");
            bean.setB("23");
            String a = JSONObject.toJSONString(bean);
            out.append(a);
            out.flush();
            out.close();

            int code = connection.getResponseCode();
            InputStream is = null;
            if (code == 200) {
                is = connection.getInputStream();
            } else {
                is = connection.getErrorStream();
            }

            // 讀取響應(yīng)
            int length = (int) connection.getContentLength();// 獲取長度
            if (length != -1) {
                byte[] data = new byte[length];
                byte[] temp = new byte[512];
                int readLen = 0;
                int destPos = 0;
                while ((readLen = is.read(temp)) > 0) {
                    System.arraycopy(temp, 0, data, destPos, readLen);
                    destPos += readLen;
                }
                String result = new String(data, "UTF-8"); // utf-8編碼
                System.out.println(result);
                //return result;
            }
        } catch (IOException e) {
            //LOG.error("Exception occur when send http post request!", e);
        }
    }

上面的代碼，改自：
https://blog.csdn.net/java173842219/article/details/54020168

參考
https://blog.csdn.net/ff906317011/article/details/78552426
該文章簡單介紹了@RequestMapping @ResponseBody 和 @RequestBody 注解的用法與區(qū)別

參考
https://www.cnblogs.com/dflmg/p/6364141.html
該文章，使用ajax請求。不過里面說明了請求的時候，發(fā)送到服務(wù)端的內(nèi)容被解析的方式。
https://www.cnblogs.com/qiankun-site/p/5774300.html

參考
https://blog.csdn.net/ljxbbss/article/details/74452326
該文章用實例說明了400錯誤的情況，以及用postman進行測試的方式

400錯誤：表示數(shù)據(jù)的參數(shù)類型錯誤
https://www.cnblogs.com/beppezhang/p/5824986.html

415錯誤：表示格式錯誤，比如content-type 參數(shù)搞錯了。
https://blog.csdn.net/majinggogogo/article/details/78383772

500系統(tǒng)錯誤。https://blog.csdn.net/xiejunna/article/details/70049094

POSTMan的使用
https://blog.csdn.net/afterlife_qiye/article/details/62218572

參考
這個文章，對接受的參數(shù)類型聊得更深刻。
https://blog.csdn.net/m0_37499059/article/details/78798077

參考
使用mock測試的方式，沒有實踐過，記下
https://www.cnblogs.com/knyel/p/7901034.html

文章中給了三種傳入方式
https://blog.csdn.net/lx_yoyo/article/details/72871091

springboot的測試方式
http://somefuture.iteye.com/blog/2247207