[网络协议]java 第三方HTTP请求的调用

HttpURLConnection

			  String listPolicyApiUrl = "请求的api地址";
            Map map = new HashMap();
            map.put("chanelCode",channelId);
            map.put("IsInsureArray",1);//1需要 0 不需要
            map.put("appId",APPID);

			//请求参数装换成jasn格式字符串
            String body = JSONObject.toJSONString(map);

            OutputStreamWriter out = null;
            BufferedReader br = null;
            String result = "";

            URL url = new URL(listPolicyApiUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
//            String sign = Md5Utils.getMD5String(body+APPKey);
            //请求方式
            conn.setRequestMethod("POST");

            //设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
            conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
            //可在请求头添加额外请验证秘钥
            conn.setRequestProperty("eliteSign",sign);
            //DoOutput设置是否向httpUrlConnection输出，DoInput设置是否从httpUrlConnection读入，此外发送post请求必须设置这两个
            conn.setDoOutput(true);
            conn.setDoInput(true);

            //获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            //发送请求参数即数据
            out.write(body);
            //flush输出流的缓冲
            out.flush();

            /**
             * 下面的代码相当于，获取调用第三方http接口后返回的结果
             */
            //获取URLConnection对象对应的输入流
            InputStream is = conn.getInputStream();
            //构造一个字符流缓存
            br = new BufferedReader(new InputStreamReader(is));
            String str = "";
            while ((str = br.readLine()) != null){
                result += str;
            }
            System.out.println("结果");
            System.out.println(result);
            //关闭流
            is.close();
            //断开连接，
            conn.disconnect();

HttpClient

            //创建HttpClient对象
            CloseableHttpClient httpClient = HttpClients.createDefault();
            //创建get请求
            HttpPost httpPost = new HttpPost(listPolicyApiUrl);
            //设置请求头  比如一些需要登录验证的接口，就需要设置请求头和请求头的值  "username:password"登陆验证的密码

            JSONObject jsonParam = new JSONObject();
            jsonParam.put("appId", 2);
            jsonParam.put("IsInsureArray", 1);
            jsonParam.put("chanelCode", 3);

            httpPost.setHeader("eliteSign", sign);
            httpPost.setHeader("Content-type", "application/json;charset=utf-8");

            StringEntity s = new StringEntity(body, "utf-8");
            s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
//            //设置参数加到请求对象中
            httpPost.setEntity(s);

            //执行
            HttpResponse response = httpClient.execute(httpPost);
            //获取状态码
            int responseCode = response.getStatusLine().getStatusCode();
            if (responseCode == 200) {
                //获取请求体
                HttpEntity entity = response.getEntity();
                //获取请求体的内容
                //通过流的方式进行读取
                InputStream input = entity.getContent();
                BufferedReader br = new BufferedReader(new InputStreamReader(input));
                String str1 = br.readLine();
                //获取到返回的json字符串
                String result = new String(str1.getBytes("utf-8"), "utf-8");
                System.out.println(result);
                br.close();
                input.close();
            }

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