Android中HTTP通信之HttpURLConnection与HttpClient

//发送GET请求
                    url = new URL("http://192.168.31.200:8080/HttpServer/MyServlet?name=孙群&age=27");
                    conn = (HttpURLConnection) url.openConnection();
                    //HttpURLConnection默认就是用GET发送请求，所以下面的setRequestMethod可以省略
                    conn.setRequestMethod("GET");
                    //HttpURLConnection默认也支持从服务端读取结果流，所以下面的setDoInput也可以省略
                    conn.setDoInput(true);
                    //用setRequestProperty方法设置一个自定义的请求头:action，由于后端判断
                    conn.setRequestProperty("action", NETWORK_GET);
                    //禁用网络缓存
                    conn.setUseCaches(false);
                    //获取请求头
                    requestHeader = getReqeustHeader(conn);
                    //在对各种参数配置完成后，通过调用connect方法建立TCP连接，但是并未真正获取数据
                    //conn.connect()方法不必显式调用，当调用conn.getInputStream()方法时内部也会自动调用connect方法
                    conn.connect();
                    //调用getInputStream方法后，服务端才会收到请求，并阻塞式地接收服务端返回的数据
                    InputStream is = conn.getInputStream(); //获取URL连接的输入流，从而获取响应的内容 //将InputStream转换成byte数组,getBytesByInputStream会关闭输入流
                    respOnseBody= getBytesByInputStream(is);
                    //获取响应头
                    respOnseHeader= getResponseHeader(conn);

try {
            URL httpUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
        } catch (Exception e) {
            e.printStackTrace();
        }
String result = "";
 try {
            InputStreamReader input = new InputStreamReader(conn.getInputStream());
            BufferedReader buffer = new BufferedReader(input);
            while ((inputLine = buffer.readLine()) != null)
                result += inputLine + "\n";
            buffer.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;

        try {
            URL httpUrl = new URL(url);
            conn = (HttpURLConnection) httpUrl.openConnection();
        } catch (Exception e) {
            e.printStackTrace();
        }
        String result = "";
        try {
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setRequestMethod("POST");
            conn.setUseCaches(false);
            OutputStream out = conn.getOutputStream();
            print = new PrintWriter(out);
            print.print(params);
            print.flush();            
            InputStreamReader input = new InputStreamReader(
                    conn.getInputStream());
            BufferedReader buffer = new BufferedReader(input);
            String inputLine = null;
            while ((inputLine = buffer.readLine()) != null)
                result += inputLine + "\n";
            print.close();
            buffer.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;