java post请求参数 java post请求 json

 通过post请求传入请求体为json返回为json

public static void main(String[] args) {
        String q =base64格式的图片;
       JSONObject s= JsonToObject("src",q);


        System.out.println(s);
        String url ="https://api.mathpix.com/v3/text";
        try {
       String  res =     send(url,s,"utf-8");
            System.out.println(res);

        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println(q);
    }
public static String send(String url, JSONObject jsonObject, String encoding) throws ParseException, IOException {
        String body = "";

        //创建httpclient对象
        CloseableHttpClient client = HttpClients.createDefault();
        //创建post方式请求对象
        HttpPost httpPost = new HttpPost(url);

        //装填参数
        StringEntity s = new StringEntity(jsonObject.toString(), "utf-8");
        s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
                "application/json"));
        //设置参数到请求对象中
        httpPost.setEntity(s);
        System.out.println("请求地址："+url);
//        System.out.println("请求参数："+nvps.toString());

        //设置header信息
        //指定报文头【Content-type】、【User-Agent】{app_id}{app_key}

        httpPost.setHeader("app_id", "xxxxxxxxxxxxxxxxxx");
        httpPost.setHeader("app_key", "xxxxxxxxxxxxxxxxxxx");
        httpPost.setHeader("Content-type", "application/json");
        httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

        //执行请求操作，并拿到结果（同步阻塞）
        CloseableHttpResponse response = client.execute(httpPost);
        //获取结果实体
        HttpEntity entity = response.getEntity();
        System.out.println(entity);
        if (entity != null) {
            //按指定编码转换结果实体为String类型
            body = EntityUtils.toString(entity, encoding);
        }
        EntityUtils.consume(entity);
        //释放链接
        response.close();
        return body;
    }