HttpClient 用法

Android的网络通信的方式有两种：

1. Socket
2. HTTP

而其中，HTTP又包括两种编程方式：

1. HttpURLConnection
2. HttpClient

这篇文章介绍的就是，HttpClient

 

首先，依然是创建

HttpClient client = new DefaultHttpClient();

 

第二步，GET请求方式，获得服务器响应

HttpGet httpGet = new HttpGet("http://www.baidu.com");

httpClient.execute(httpSet);

 

第三步，判断返回的状态码

if(httpResponse.getStatusLine().getStatusCode()==200){

}

 

四步，创建HttpEntity对象，获取服务器响应

HttpEntity entity = httpResponse.getEntity();

String response = EntityUtils.toString(entity,"utf-8");

 

MainActivity.java 

public class MainActivity extends Activity implements OnClickListener {

 

    private Button sendRequest;

    private TextView responseText;

 

    public static final int SHOW_RESPONSE = 0;

    private Handler handler = new Handler(){

        public void handleMessage(Message msg){

            switch (msg.what) {

            case SHOW_RESPONSE:

                String response = (String)msg.obj;

                responseText.setText(response);

                break;

 

            default:

                break;

            }

        }

    };

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

 

        sendRequest = (Button) findViewById(R.id.send_request);

        responseText = (TextView) findViewById(R.id.response);

        sendRequest.setOnClickListener(this);

    }

 

    @Override

    public void onClick(View v) {

        // TODO Auto-generated method stub

        if (v.getId() == R.id.send_request) {

//            sendRequestWithHttpURLConnection();

            sendRequestWithHttpClient();

        }

    }

    private void sendRequestWithHttpClient(){

        new Thread(new Runnable() {

 

            @Override

            public void run() {

                // TODO Auto-generated method stub

                try{

                    HttpClient client = new DefaultHttpClient();

                    HttpGet get = new HttpGet("http://www.baidu.com");

                    HttpResponse httpResponse =   client.execute(get);

                    if(httpResponse.getStatusLine().getStatusCode()==200){

                        HttpEntity entity = httpResponse.getEntity();

                        String response = EntityUtils.toString(entity,"utf-8");

                        Message message = new Message();

                        message.what=SHOW_RESPONSE;

                        message.obj=response;

                        handler.sendMessage(message);

                    }

                }catch(Exception e){

                    e.printStackTrace();

                }

 

            }

        }).start();

    }

}

 

除了sendRequestWithHttpClient与之前的HttpURLConnection不同，其他部分的代码都是相同的。