Android HTTP发送请求和接收响应的实例代码

Android HTTP发送请求和接收响应的实例代码攻略

在Android开发中，发送HTTP请求和接收响应是非常常见的任务。下面是一个详细的攻略，包含了两个示例说明，展示了如何在Android应用中发送HTTP请求和接收响应。

步骤1：添加网络权限

首先，在AndroidManifest.xml文件中添加网络权限。这将允许应用程序进行网络通信。在<manifest>标签内添加以下代码：

<uses-permission android:name=\"android.permission.INTERNET\" />

步骤2：使用HttpClient发送HTTP请求

Android提供了HttpClient类来发送HTTP请求。以下是一个示例代码，演示如何使用HttpClient发送GET请求并接收响应：

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

public class MainActivity extends AppCompatActivity {
    private static final String URL = \"http://example.com/api/data\";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpClient httpClient = new DefaultHttpClient();
                HttpGet httpGet = new HttpGet(URL);

                try {
                    HttpResponse response = httpClient.execute(httpGet);
                    String responseBody = EntityUtils.toString(response.getEntity());

                    // 在这里处理响应数据
                    Log.d(\"HTTP Response\", responseBody);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}

步骤3：使用HttpURLConnection发送HTTP请求

除了HttpClient，Android还提供了HttpURLConnection类来发送HTTP请求。以下是一个示例代码，演示如何使用HttpURLConnection发送POST请求并接收响应：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity {
    private static final String URL = \"http://example.com/api/data\";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    URL url = new URL(URL);
                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod(\"POST\");
                    connection.setDoOutput(true);

                    // 设置请求参数
                    String requestBody = \"param1=value1&param2=value2\";
                    OutputStream outputStream = connection.getOutputStream();
                    outputStream.write(requestBody.getBytes());
                    outputStream.flush();
                    outputStream.close();

                    int responseCode = connection.getResponseCode();
                    if (responseCode == HttpURLConnection.HTTP_OK) {
                        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                        StringBuilder response = new StringBuilder();
                        String line;
                        while ((line = reader.readLine()) != null) {
                            response.append(line);
                        }
                        reader.close();

                        // 在这里处理响应数据
                        Log.d(\"HTTP Response\", response.toString());
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}

以上示例代码演示了如何使用HttpClient和HttpURLConnection发送HTTP请求并接收响应。你可以根据自己的需求进行修改和扩展。记得在实际应用中，应该在后台线程中执行网络请求，以避免阻塞UI线程。