Java自带的Http Server实现设置返回值的类型(content-type)

private void response(HttpExchange exchange, String jsonBody) {
        try {
            byte[] bytes = jsonBody.getBytes(StandardCharsets.UTF_8);
            exchange.getResponseHeaders().add("Content-Type", "application/json; charset=utf-8");
            exchange.sendResponseHeaders(200, bytes.length);
            OutputStream outputStream = exchange.getResponseBody();
            outputStream.write(jsonBody.getBytes(StandardCharsets.UTF_8));
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     *description:获取http接口返回值 有参数
     * 返回值为 jsonarray 字符串形式
     *@author: fuxb
     *@date: 2021/7/28 11:00
     @param path  http 接口地址
     @param post  参数 形式为  param1=value1&param2=value2
     *@return: com.google.gson.JsonObject
     */
    public static String postDownloadJson(String path,String post){
        URL url = null;
        try {
            url = new URL(path);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");// 提交模式
            // conn.setConnectTimeout(10000);//连接超时 单位毫秒
            // conn.setReadTimeout(2000);//读取超时 单位毫秒
            // 发送POST请求必须设置如下两行
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            // 获取URLConnection对象对应的输出流  解决java.io.IOException: Server returned HTTP response code: 500  问题，使用OutputStreamWriter 转 utf-8格式，参数不能有空格的问题
//            PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
            OutputStreamWriter printWriter = new OutputStreamWriter(httpURLConnection.getOutputStream(), "utf-8");
            // 发送请求参数
            java.net.URLEncoder.encode(post, "UTF-8");
            printWriter.write(post);//post的参数 xx=xx&yy=yy
            // flush输出流的缓冲
            printWriter.flush();
            //开始获取数据
            BufferedInputStream bis = new   BufferedInputStream(httpURLConnection.getInputStream());
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            int len;
            byte[] arr = new byte[1024];
            while((len=bis.read(arr))!= -1){
                bos.write(arr,0,len);
                bos.flush();
            }
            bos.close();
//            return (JsonObject)parse.parse(bos.toString("utf-8"));
            return bos.toString("utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

//返回的json数组字符串转list<bean>:
List<ResKPID> listKpid = JSONObject.parseArray(listStrKpid, ResKPID.class);