1.android的API提供了访问网络的一个类HttpURLConnection
2.通过发送GET请求获取服务器返回的html代码
3.先看看布局文件,如下所示,
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <EditText android:id="@+id/et" android:layout_width="match_parent" android:layout_height="wrap_content" /> <Button android:onClick="get" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="获取源码"/> <ScrollView android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/tv" android:layout_width="match_parent" android:layout_height="match_parent" android:textColor="#00f" android:hint="源码显示"/> </ScrollView></LinearLayout>
布局样子:
4.下来是清单文件,记得连接网络要添加权限
5.1再看java代码,MainActivity的
package com.market.source;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.EditText;import android.widget.TextView;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.ProtocolException;import java.net.URL;import java.net.URLConnection;import butterknife.BindView;import butterknife.ButterKnife;public class MainActivity extends Activity { @BindView(R.id.et) EditText et; @BindView(R.id.tv) TextView tv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ButterKnife.bind(this); } public void get(View vew) throws IOException { final String str = et.getText().toString().trim(); new Thread(){ @Override public void run() { //1.请求地址url URL url = null; try { url = new URL(str); //2.获取对这个地址的连接 HttpURLConnection con = (HttpURLConnection) url.openConnection(); //3.设置对这个地址的请求,GET请求 con.setRequestMethod("GET"); //4.设置请求参数 con.setConnectTimeout(5000); //5.获取服务器的响应 int code = con.getResponseCode(); //6.根据响应吗,判断请求成功还是失败,200成功 if(code==200){ //7.成功的话,服务器一流的形式返回数据 InputStream inputStream = con.getInputStream(); //8.这个流是字节流,需要我们转换为字符流才可以认识 final String info = StreamTool.StreamtoString(inputStream); Log.e("MainActivity",info); runOnUiThread(new Runnable() { @Override public void run() { tv.setText(info); } }); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (ProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }.start(); } }
5.2工具类,用来将一个流转化为字符串
public class StreamTool { public static String StreamtoString(InputStream inputStream) { int len = -1; byte[] buffer = new byte[1024]; //内存数组输出流 ByteArrayOutputStream baos = new ByteArrayOutputStream(); try { while((len=inputStream.read(buffer)) != -1){ baos.write(buffer,0,len); } String str = new String(baos.toByteArray()); return str; } catch (IOException e) { e.printStackTrace(); }finally { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } return null; } }
6.运行效果查看
时间: 2024-10-11 10:26:27