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。