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。