<?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">
 <Button
  android:id="@+id/btn"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="連接Web服務(wù)器"
  android:layout_gravity="center"/>
 <EditText
  android:id="@+id/edittext1"
  android:layout_width="250dp"
  android:layout_height="50dp"
  android:layout_gravity="center" />
 <EditText
  android:id="@+id/edittext2"
  android:layout_width="250dp"
  android:layout_height="50dp"
  android:layout_gravity="center"/>
 <ImageView
  android:id="@+id/imageview"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" />
</LinearLayout>

package com.test.web_server;

import android.app.Activity;
import android.app.Notification;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.StrictMode;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends Activity {
 Button btn;
 EditText txt1,txt2;
 ImageView img;
 HttpURLConnection conn = null;
 InputStream inStream = null;
 String str = "http://(這里填寫本機(jī)的IP地址):80/test/yinghua.jpg"; //使用Web網(wǎng)站IP(本地IP+port訪問，并非localhost)，test文件夾為www下創(chuàng)建
 HHandler mHandler = new HHandler();
 @Override
 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main2);
  img = (ImageView)findViewById(R.id.imageview);
  txt1 = (EditText)findViewById(R.id.edittext1);
  txt2 = (EditText)findViewById(R.id.edittext2);
  btn = (Button)findViewById(R.id.btn);
  btn.setOnClickListener(new mClick());
 }
 class mClick implements View.OnClickListener
 {
  public void onClick(View arg0)
  {
   StrictMode.setThreadPolicy(
     new StrictMode
       .ThreadPolicy
       .Builder()
       .detectDiskReads()
       .detectDiskWrites()
       .detectNetwork()
       .penaltyLog()
       .build());
   StrictMode.setVmPolicy(
     new StrictMode
       .VmPolicy
       .Builder()
       .detectLeakedSqlLiteObjects()
       .detectLeakedClosableObjects()
       .penaltyLog()
       .penaltyDeath()
       .build());
   getPicture();
  }
 }

 private void getPicture(){
  try{
   URL url = new URL(str); //構(gòu)建圖片的URL地址
   conn = (HttpURLConnection) url.openConnection();
   conn.setConnectTimeout(5000); //設(shè)置超時時間，5000毫秒即為5秒
   conn.setRequestMethod("GET"); //設(shè)置獲取圖片的方式為GET
   if(conn.getResponseCode()==200) //響應(yīng)碼為200則為訪問成功
   {
    //獲取連接的輸入流，這個輸入流就是圖片的輸入流
    inStream = conn.getInputStream();
    Bitmap bmp = BitmapFactory.decodeStream(inStream);
    //由于不是msg,因此不能使用sendMessage(msg)方法
    mHandler.obtainMessage(0,bmp).sendToTarget(); //向Handler發(fā)送消息，更新UI
    int result = inStream.read();
    while(result != -1){
     txt1.setText((char)result);
     result = inStream.read();
    }
    //關(guān)閉輸入流
    inStream.close();
    txt1.setText("（1）建立輸入流成功!");
   }
  }catch (Exception e2){txt1.setText("（3）IO流失敗");}
 } //gitPicture()結(jié)束

 /**
  Android利用Handler來實(shí)現(xiàn)UI線程的更新。
  Handler是Android中的消息發(fā)送器，主要接受子線程發(fā)送的數(shù)據(jù)，并用此數(shù)據(jù)配合主線程更新UI
  接受消息，處理消息，此Handler會與當(dāng)前主線程一塊運(yùn)行
  */

 class HHandler extends Handler
 { //子類必須重寫此方法，接受數(shù)據(jù)
  public void handleMessage(Message msg){
   super.handleMessage(msg);
   txt2.setText("（2）下載圖像成功!");
   img.setImageBitmap((Bitmap) msg.obj); //更新UI
  }
 }
} //主類結(jié)束

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