后台http請求參數為json 【轉】

代碼實現：

/**
     * 向指定 URL 發送POST方法的請求(數據格式為json)
     *
     * @param url 發送請求的 URL
     * @param paramMap 請求參數集合
     * @param paramMap 請求參數，請求參數為json的形式。
     * @return 所代表遠程資源的響應結果
     */
    public static String sendPost(String url, Map<String, Object> paramMap) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse httpResponse = null;
        String result = "";
        // 創建httpClient實例
        httpClient = HttpClients.createDefault();
        // 創建httpPost遠程連接實例
        HttpPost httpPost = new HttpPost(url);

        // 配置請求參數實例
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(35000)// 設置連接主機服務超時時間
                .setConnectionRequestTimeout(35000)// 設置連接請求超時時間
                .setSocketTimeout(60000)// 設置讀取數據連接超時時間
                .build();
        // 為httpPost實例設置配置
        httpPost.setConfig(requestConfig);
        // 設置請求頭
        httpPost.addHeader("Content-Type", "application/json");
        httpPost.addHeader("appid", "avkp4qyu01fki");


        // 封裝post請求參數
        JSONObject jsonObject = new JSONObject();
        if (null != paramMap && paramMap.size() > 0) {
            //List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            // 通過map集成entrySet方法獲取entity
            Set<Map.Entry<String, Object>> entrySet = paramMap.entrySet();
            // 循環遍歷，獲取迭代器
            Iterator<Map.Entry<String, Object>> iterator = entrySet.iterator();
            while (iterator.hasNext()) {
                Map.Entry<String, Object> mapEntry = iterator.next();
                //nvps.add(new BasicNameValuePair(mapEntry.getKey(), mapEntry.getValue().toString()));
                jsonObject.put(mapEntry.getKey(),mapEntry.getValue());
            }
            ContentType contentType = ContentType.create("application/json");
            // 為httpPost設置封裝好的請求參數
            try {
                //設置參數的content-type格式
                httpPost.setEntity(new StringEntity(jsonObject.toString(), contentType));
                //此方式參數content-type為application/x-www-form-urlencoded,源碼中默認實現的
                //httpPost.setEntity(new UrlEncodedFormEntity(nvps,"utf-8"));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        try {
            // httpClient對象執行post請求,並返回響應參數對象
            httpResponse = httpClient.execute(httpPost);
            // 從響應對象中獲取響應內容
            HttpEntity entity = httpResponse.getEntity();
            result = EntityUtils.toString(entity);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 關閉資源
            if (null != httpResponse) {
                try {
                    httpResponse.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != httpClient) {
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return result;
    }
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版權聲明：本文為CSDN博主「gxk2019」的原創文章，遵循 CC 4.0 BY-SA 版權協議，轉載請附上原文出處鏈接及本聲明。
原文鏈接：https://blog.csdn.net/gxkvji/article/details/97966198

通過HttpservletRequest接收json數據

        // 接收json數據
        BufferedReader streamReader = new BufferedReader(new InputStreamReader(
                req.getInputStream(), "UTF-8"));
        StringBuilder responseStrBuilder = new StringBuilder();
        String inputStr;
        while ((inputStr = streamReader.readLine()) != null)
            responseStrBuilder.append(inputStr);
        // 轉化成json對象
        JSONObject jsonObject = JSONObject.fromObject(responseStrBuilder
                .toString());