Java Post请求调用服务接口

下面是我简单的记录接口

/**
     * POST---有参测试(对象参数)
     *
     * @date 2020年10月13日 下午4:18:50
     */
    public static String httpClientPostForm(String url,Map map) {
         String t="";
        // 获得Http客户端(可以理解为:你得先有一个浏览器;注意:实际上HttpClient与浏览器是不一样的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 创建Post请求
        HttpPost httpPost = new HttpPost(url);
        // 我这里利用阿里的fastjson，将Object转换为json字符串;
        // (需要导入com.alibaba.fastjson.JSON包)
        String jsonString = JSON.toJSONString(map);
        StringEntity entity = new StringEntity(jsonString, "UTF-8");
        // post请求是将参数放在请求体里面传过去的;这里将entity放入post请求体中
        httpPost.setEntity(entity);
        httpPost.setHeader("Content-Type", "application/json;charset=utf8");
        // 响应模型
        CloseableHttpResponse response = null;
        try {
            // 由客户端执行(发送)Post请求
            response = httpClient.execute(httpPost);
            // 从响应模型中获取响应实体
            HttpEntity responseEntity = response.getEntity();
            System.out.println("响应状态为:" + response.getStatusLine());
            if (responseEntity != null) {
                t=  EntityUtils.toString(responseEntity);
                System.out.println("响应内容长度为:" + responseEntity.getContentLength());
                System.out.println("响应内容为:" + t);
            }
        }catch (Exception e) {
            e.printStackTrace();
        }  finally {
            try {
                // 释放资源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return t;
    }

调用也非常简单(修改下调用类名)

String createRes = this.httpClientPostForm("完整的URL及调用方法", "Map(相关参数)");