Android通过SOCKET下载文件的方法

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;
 }
 @Override
 public void run() {
  Looper.prepare();
  while(!Thread.interrupted()){
   try {
    socket = new Socket(serverIp, socketPort);
    InputStream in = socket.getInputStream();
    OutputStream out = socket.getOutputStream();
    out.write((functionName + "\n").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。