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布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.zhangli.wangluo.MainActivity" >

    <EditText
        android:id="@+id/et_path"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入网址" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="click"
        android:text="进去" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <TextView
            android:id="@+id/tv_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </ScrollView>

</LinearLayout>

 

新建一个java类：

放输出流的：

package com.zhangli.IO;

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

public class StreamTools {
	public static String readInputStream(InputStream is) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		int len = 0;
		byte buffer[] = new byte[1024];
		try {
			while ((len = is.read(buffer)) != -1) {
				baos.write(buffer, 0, len);
			}
			is.close();
			byte[] result = baos.toByteArray();
			// 试着解析result里面的字符串
			String temp = new String(result);
			if (temp.contains("utf-8")) {
				return temp;
			} else if (temp.contains("gb2312")) {
				return new String("gb2312");
			} else {
				return temp;
			}
		} catch (Exception e) {
			e.printStackTrace();
			return "获取失败";
		}
	}
}

MainActivity:

package com.zhangli.wangluo;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import com.zhangli.IO.StreamTools;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
	protected static final int ERROR = 1;
	protected static final int SHOW_TEXT = 2;
	private EditText et_path;
	private TextView tv_content;
	// 定义一个消息处理器
	private Handler handler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			switch (msg.what) {
			case ERROR:
				Toast.makeText(MainActivity.this, "加载失败", Toast.LENGTH_SHORT).show();
				break;
			case SHOW_TEXT:
				String text = (String) msg.obj;
				tv_content.setText(text);
				break;
			}
		}
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		tv_content = (TextView) findViewById(R.id.tv_content);
		et_path = (EditText) findViewById(R.id.et_path);
	}

	public void click(View view) {
		final String path = et_path.getText().toString().trim();
		if (TextUtils.isEmpty(path)) {
			Toast.makeText(this, "路径不能为空", Toast.LENGTH_SHORT).show();
		} else {
			new Thread() {
				public void run() {
					try {
						URL url = new URL(path);
						HttpURLConnection conn = (HttpURLConnection) url.openConnection();
						conn.setRequestMethod("GET");
						conn.setConnectTimeout(50000);

						int code = conn.getResponseCode();
						if (code == 200) {
							InputStream is = conn.getInputStream();
							String result = StreamTools.readInputStream(is);
							// tv_content.setText(result);
							Message msg = new Message();
							msg.what = SHOW_TEXT;
							msg.obj = result;
							handler.sendMessage(msg);
						} else {
							Message msg = new Message();
							msg.what = ERROR;
							handler.sendMessage(msg);
						}
					} catch (Exception e) {
						e.printStackTrace();
						Message msg = new Message();
						msg.what = ERROR;
						handler.sendMessage(msg);
					}
				};
			}.start();
		}
	}

}

加入权限：

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