1、布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <EditText
        android:id="@+id/url"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="输入网址"
        />
    <Button
        android:id="@+id/send"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="开始提取"
        />
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView
            android:id="@+id/text"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </ScrollView>
</LinearLayout>

2、主要代码


package com.get.demo;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends Activity {

    EditText url;
    Button send;
    TextView text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        url = (EditText) findViewById(R.id.url);
        send = (Button) findViewById(R.id.send);
        text = (TextView) findViewById(R.id.text);
        //按钮点击事件
        send.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                //执行httpGet方法
                httpGet();
            }
        });

    }

    private void httpGet() {
        //开子线程网络请求
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection=null;
                BufferedReader reader=null;
                String urls=url.getText().toString();

                try {
                    URL url=new URL(urls);
                    connection=(HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setReadTimeout(5000);
                    connection.setConnectTimeout(5000);
                    InputStream in=connection.getInputStream();

                    reader = new BufferedReader( new InputStreamReader(in));
                    StringBuilder response =new StringBuilder();
                    String line;
                    while ((line=reader.readLine())!=null){
                        response.append(line);
                    }
                    showResponse(response.toString());
                } catch (IOException e) {
                    e.printStackTrace();
                }finally {
                    if (reader!=null){
                        try {
                            reader.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                    if (connection!=null){
                        connection.disconnect();
                    }
                }


            }
        }).start();
    }

    //切换为主线程
    private void showResponse(final String response){
        runOnUiThread(new Runnable() {
            @Override
            public void run() {

                try {
                    text.setText(new String(response.getBytes(),"UTF-8"));
                    //把获取的网页数据赋值给变量response，并设置给TextView控件
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }
        });
    }

}