【Android Demo】获取指定网页的页面源代码

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * 获取HTML数据
 * 
 * @author David
 * 
 */
public class HtmlService {

    public static String getHtml(String path) throws Exception {
        // 通过网络地址创建URL对象
        URL url = new URL(path);
        // 根据URL
        // 打开连接，URL.openConnection函数会根据URL的类型，返回不同的URLConnection子类的对象，这里URL是一个http，因此实际返回的是HttpURLConnection
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        // 设定URL的请求类别，有POST、GET 两类
        conn.setRequestMethod("GET");
        //设置从主机读取数据超时（单位：毫秒）
        conn.setConnectTimeout(5000);
        //设置连接主机超时（单位：毫秒）
        conn.setReadTimeout(5000);
        // 通过打开的连接读取的输入流,获取html数据
        InputStream inStream = conn.getInputStream();
        // 得到html的二进制数据
        byte[] data = readInputStream(inStream);
        // 是用指定的字符集解码指定的字节数组构造一个新的字符串
        String html = new String(data, "utf-8");
        return html;
    }

    /**
     * 读取输入流，得到html的二进制数据
     * 
     * @param inStream
     * @return
     * @throws Exception
     */
    public static byte[] readInputStream(InputStream inStream) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = inStream.read(buffer)) != -1) {
            outStream.write(buffer, 0, len);
        }
        inStream.close();
        return outStream.toByteArray();
    }

}

public class MainActivity extends Activity {

    private String path = "http://www.cnblogs.com/yc-755909659/";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        TextView textView = (TextView)this.findViewById(R.id.textView);  
        try {  
            String htmlContent = HtmlService.getHtml(path);
            textView.setText(htmlContent);  
        } catch (Exception e) {     
            textView.setText("程序出现异常："+e.toString());
        }  
    }
}

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</ScrollView>

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