【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"/>