android下载服务器端文件(Socket实现下载文件）

【实例简介】android客户端利用sokcet通信和向Java服务端发请求，Java服务端把文件发给android客户端

调试时需要将 android端 连接的 ip地址 改为您服务器的ip地址 即可

【实例截图】

服务端截图:

android端截图

【核心代码】

android端源码如下：

package com.yqq.SocketClient;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.view.View;
import android.widget.Toast;

public class SocketClient extends Activity {
	private Socket socket;
	InputStream inputStream;
	OutputStream outputStream;
	Handler mHandler=new Handler(){
		
		public void handleMessage(Message msg) {
			
			if(msg.what==0x123){
				Toast.makeText(SocketClient.this,"文件下载完毕", 0).show();
			}
		}
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(com.example.socketclient.R.layout.main);
	}

	public void downFile(View v){
		new Thread(new Runnable() {
			
			@Override
			public void run() {
				try {
					socket=new Socket(InetAddress.getByName("172.20.113.1"), 20000);
					inputStream=socket.getInputStream();
					outputStream=socket.getOutputStream();
					outputStream.write("askForFile".getBytes());
					outputStream.flush();
					//socket.shutdownOutput();
					Thread.sleep(3000);
					byte[] buffer=new byte[1024];
					File file=new File(getCacheDir(),"测试");
					FileOutputStream fileOutputStream=new FileOutputStream(file);
					while(inputStream.read(buffer)!=-1){
						fileOutputStream.write(buffer);
						
					}
					
					Looper.prepare();
					Message message=Message.obtain();
					message.what=0x123;
					mHandler.sendMessage(message);
					Looper.loop();
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				
			}
		}).start();
		
	}
}