本文实例讲述了Android通过SOCKET下载文件的方法。分享给大家供大家参考,具体如下:
服务端代码
import java.io.BufferedInputStream;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.ServerSocket;import java.net.Socket;import java.util.Scanner;public class FunctionServer { private static int PORT = 2012; private String path = "需要下载的文件所在路径"; public static void main(String[] args) throws IOException{FunctionServer server = new FunctionServer();server.start(); } public void start() throws IOException{ServerSocket ss = new ServerSocket(PORT);while(true){ Socket s = ss.accept(); new Service(s).start();//创建线程} } class Service extends Thread{Socket s;public Service(Socket s){ this.s = s;}public void run(){ try{InputStream in = s.getInputStream();//得到输入流Scanner sc = new Scanner(in);OutputStream out = s.getOutputStream();while(true){ String str = sc.nextLine();//读取文件名 if(!str.equals(null)){System.out.println("你的文件名是"+str);//根据路径和文件名获取文件File f = new File(path+str);FileInputStream fis = new FileInputStream(f);DataInputStream dis = new DataInputStream(new BufferedInputStream(fis));byte[] buffer = new byte[8192];DataOutputStream ps = new DataOutputStream(out);ps.writeLong((long) f.length());//发送文件大小ps.flush();while(true) { int read = 0; if(dis!=null){read = fis.read(buffer); } if(read == -1){break; } ps.write(buffer,0,read);}ps.flush();dis.close();s.close();out.flush();break; }} }catch(IOException e){e.printStackTrace(); }} }}
客户端代码,下载线程
class DownloadThread extends Thread {Socket socket;InputStream in;OutputStream out;String path = "文件保存路径";String functionName;String serverIp = "服务器IP";int socketPort = "服务端口号";int fileSize,downLoadFileSize;public DownloadThread(String functionName) { this.functionName = functionName;}@Overridepublic void run() { Looper.prepare(); while(!Thread.interrupted()){try { socket = new Socket(serverIp, socketPort); InputStream in = socket.getInputStream(); OutputStream out = socket.getOutputStream(); out.write((functionName + "
").getBytes("gbk")); out.flush(); // 清理缓冲,确保发送到服务端 File f = new File(path + functionName); OutputStream song = new FileOutputStream(f); DataInputStream dis = new DataInputStream( new BufferedInputStream(in)); DataOutputStream dos = new DataOutputStream( new BufferedOutputStream(song)); fileSize = (int) dis.readLong() - 1; System.out.println("开始下载"); byte[] buffer = new byte[8192]; while (true) {int read = 0;if (dis != null) { read = dis.read(buffer); downLoadFileSize += read;}if (read == -1) { break;}dos.write(buffer, 0, read); } System.out.println("文件下载完成"); dos.close();} catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace();} catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace();} finally { this.interrupt();} }} }
基本可以直接用,根据自己需要稍微改动就OK了
希望本文所述对大家Android程序设计有所帮助。