后台http请求参数为json 【转】

代码实现：

/**
     * 向指定 URL 发送POST方法的请求(数据格式为json)
     *
     * @param url 发送请求的 URL
     * @param paramMap 请求参数集合
     * @param paramMap 请求参数，请求参数为json的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, Map<String, Object> paramMap) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse httpResponse = null;
        String result = "";
        // 创建httpClient实例
        httpClient = HttpClients.createDefault();
        // 创建httpPost远程连接实例
        HttpPost httpPost = new HttpPost(url);

        // 配置请求参数实例
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(35000)// 设置连接主机服务超时时间
                .setConnectionRequestTimeout(35000)// 设置连接请求超时时间
                .setSocketTimeout(60000)// 设置读取数据连接超时时间
                .build();
        // 为httpPost实例设置配置
        httpPost.setConfig(requestConfig);
        // 设置请求头
        httpPost.addHeader("Content-Type", "application/json");
        httpPost.addHeader("appid", "avkp4qyu01fki");


        // 封装post请求参数
        JSONObject jsonObject = new JSONObject();
        if (null != paramMap && paramMap.size() > 0) {
            //List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            // 通过map集成entrySet方法获取entity
            Set<Map.Entry<String, Object>> entrySet = paramMap.entrySet();
            // 循环遍历，获取迭代器
            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");
            // 为httpPost设置封装好的请求参数
            try {
                //设置参数的content-type格式
                httpPost.setEntity(new StringEntity(jsonObject.toString(), contentType));
                //此方式参数content-type为application/x-www-form-urlencoded,源码中默认实现的
                //httpPost.setEntity(new UrlEncodedFormEntity(nvps,"utf-8"));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        try {
            // httpClient对象执行post请求,并返回响应参数对象
            httpResponse = httpClient.execute(httpPost);
            // 从响应对象中获取响应内容
            HttpEntity entity = httpResponse.getEntity();
            result = EntityUtils.toString(entity);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            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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版权声明：本文为CSDN博主「gxk2019」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/gxkvji/article/details/97966198

通过HttpservletRequest接收json数据

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