org.apache.http.client 类的使用

org.apache.http.client

// post 请求
public String licenseInfo(String holderCode, String abstractCode) {
        // 获取连接客户端工具
        CloseableHttpClient httpClient = HttpClients.createDefault();

        String entityStr = null;
        CloseableHttpResponse response = null;

        try {
            /*
             * 由于GET请求的参数都是拼装在URL地址后方，所以我们要构建一个URL，带参数
             */
            URIBuilder uriBuilder = new URIBuilder(API_HOST+"/licenseinfo");
            /** 第一种添加参数的形式 */
//        /*uriBuilder.addParameter("name", "root");
            uriBuilder.addParameter("holderCode", holderCode);
            uriBuilder.addParameter("abstractCode", abstractCode);
            /** 第二种添加参数的形式 */
            List list = new LinkedList<>();
//            BasicNameValuePair param1 = new BasicNameValuePair("holderCode", idNo);
//            BasicNameValuePair param2 = new BasicNameValuePair("password", "123456");
//            list.add(param1);
//            list.add(param2);
//            uriBuilder.setParameters(list);
            // 根据带参数的URI对象构建GET请求对象
            HttpGet httpGet = new HttpGet(uriBuilder.build());
            /*
             * 添加请求头信息
             */
            // 浏览器表示
            httpGet.addHeader("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6)");
            // 传输的类型
            httpGet.addHeader("Content-Type", "application/x-www-form-urlencoded");
            // 执行请求
            response = httpClient.execute(httpGet);
            // 获得响应的实体对象
            HttpEntity entity = response.getEntity();
            // 使用Apache提供的工具类进行转换成字符串
            entityStr = EntityUtils.toString(entity, "UTF-8");
        } catch (ClientProtocolException e) {
            System.err.println("Http协议出现问题");
            e.printStackTrace();
        } catch (ParseException e) {
            System.err.println("解析错误");
            e.printStackTrace();
        } catch (URISyntaxException e) {
            System.err.println("URI解析异常");
            e.printStackTrace();
        } catch (IOException e) {
            System.err.println("IO异常");
            e.printStackTrace();
        } finally {
            // 释放连接
            if (null != response) {
                try {
                    response.close();
                    httpClient.close();
                } catch (IOException e) {
                    System.err.println("释放连接出错");
                    e.printStackTrace();
                }
            }
        }

        // 打印响应内容
        System.out.println(entityStr);

        return entityStr;
    }