核心代码

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String htmlUrl ="http://www.baidu.com";
URL url = null;
HttpURLConnection conn = null;
int respCode = 404;
InputStream is = null;
try {
	url = new URL(htmlUrl);
	conn = (HttpURLConnection) url.openConnection();
	conn.setRequestMethod("GET");
	conn.setConnectTimeout(5 * 1000);
	respCode = conn.getResponseCode();
	if (respCode == 200) {
		is = conn.getInputStream();
		byte[] htmlBytes = StreamTools.in2bytes(is);
		String temp = new String(htmlBytes);

		// 比较白痴的获取charset的方法
		int s = temp.indexOf("charset=") + "charset=".length();	
		int e = temp.indexOf("\"", s);
		String charset = temp.substring(s, e);

		Log.i(LOG_TAG, charset);
		tvContent.setText(new String(htmlBytes, charset));
		Log.i(LOG_TAG, new String(htmlBytes, charset));
	}
} catch (Exception e) {
	Log.i(LOG_TAG, e.getMessage());
	e.printStackTrace();
}

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工具类?StreamTools

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import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class StreamTools {

	public static byte[] in2bytes(InputStream is) throws Exception {
		// 1、定义缓冲区
		// 2、定义字节输出流
		// 3、循环
		byte[] buffer = new byte[1024];
		int len = 0;
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		while ((len = is.read(buffer)) != -1) {
			baos.write(buffer, 0, len);
		}
		is.close();
		baos.flush();
		return baos.toByteArray();
	}
}