import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
* Created by liujiajia on 2016/12/2.
*/
public class HttpHelper {
    public static final String ADD_URL = "http://localhost:2001/";
    private static final String APPLICATION_JSON = "application/json";

    public static String postJson(String strUrl, String json) throws Exception {
        StringBuffer sb = new StringBuffer("");

        try {
            //创建连接
            URL url = new URL(ADD_URL + strUrl);
            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestMethod("POST");
            connection.setUseCaches(false);
            connection.setInstanceFollowRedirects(true);
            connection.setRequestProperty("Content-Type", APPLICATION_JSON);

            connection.connect();

            //POST 请求
            DataOutputStream out = new DataOutputStream(
                    connection.getOutputStream());

            out.writeBytes(json);
            out.flush();
            out.close();

            //读取响应
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String lines;
            while ((lines = reader.readLine()) != null) {
                lines = new String(lines.getBytes(), "utf-8");
                sb.append(lines);
            }

            reader.close();
            // 断开连接
            connection.disconnect();
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return sb.toString();
    }
}