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java实现文件传输

2024-07-26 06:23:53   222人阅读

在windows下装了个linux虚拟机,两者之间传输文件挺麻烦的.写了个简单的文件传输程序,来方便自己数据传送.

server 端:

 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

class CPThread extends Thread{
    Socket socket = null;
    public CPThread(Socket socket){
        this.socket = socket;
    }
    public void run(){
        try{
            InputStream in = 
                      socket.getInputStream();
            PrintWriter out = 
                  new PrintWriter(
                    new BufferedWriter(
                      new OutputStreamWriter(
                        socket.getOutputStream())),true);
            
            while(true)
            {
                //第一个參数为命令
                byte cmd[] = new byte[128];
                int b = 0;
                while(b<cmd.length){
                    b += in.read(cmd, b, cmd.length-b);
                }
                int ends = 0;
                for(int i=0;i<cmd.length;i++){
                    if(cmd[i]==‘-0‘){
                        ends = i;
                        break;
                    }
                }
                String cmds = new String(cmd,0,ends);
                if("exit".equals(cmds)){
                    System.exit(0);
                }
                else if("cp".equals(cmds)){
                    byte[] filename = new byte[256];
                    b = 0;
                    while(b<filename.length){
                        b += in.read(filename, b, filename.length-b);
                    }
                    ends = 0;
                    for(int i=0;i<filename.length;i++){
                        if(filename[i]==‘-0‘){
                            ends = i;
                            break;
                        }
                    }
                    String filenames = new String(filename,0,ends);
                    File fileout = new File(filenames);
                    if(fileout.isFile()){
                        throw new Exception("file exists"+fileout.getAbsolutePath());
                    }
                    FileOutputStream fos = new FileOutputStream(fileout);
                    
                    byte[] filesize = new byte[64];
                    b = 0;
                    while(b<filesize.length){
                        b += in.read(filesize, b, filesize.length-b);
                    }
                    
                    ends = 0;
                    for(int i=0;i<filesize.length;i++){
                        if(filesize[i]==‘-0‘){
                            ends = i;
                            break;
                        }
                    }
                    String filesizes = new String(filesize,0,ends);
                    
                    System.out.println("filesize:"+filesizes);
                    int ta = Integer.parseInt(filesizes);
                    byte[] buf = new byte[1024*10];
                    //InputStream ins = socket.getInputStream();
                    while(true){
                        if(ta==0){
                            break;
                        }
                        int len = ta;
                        if(len>buf.length){
                            len = buf.length;
                        }
                        int rlen = in.read(buf, 0, len);
                        
                        //int rlen = ins.read(buf, 0, len);
                        ta -= rlen;
                        if(rlen>0){
                            fos.write(buf,0,rlen);
                            fos.flush();
                        }
                        else{
                            break;
                        }
                    }
                    out.println("cp finish!");
                    fos.close();
                    break;
                }
                else{
                    System.out.println("err command!");
                    out.println("err command!");
                    break;
                }
            }
            socket.close();
        }catch(Exception e){
            e.printStackTrace();
            
        }
    }
}
public class JCPServer {

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub
        int num = args.length;
        if(num<=0){
            System.out.println("please input server port!");
            System.exit(0);
        }
        int port = Integer.parseInt(args[0]);
        System.out.println("you input port:"+port);
        //绑定接受数据端口
        ServerSocket s = new ServerSocket(port);
        while(true){
            Socket socket = s.accept();
            new CPThread(socket).start();
        }
    }

}

 

client 端

 

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;


public class JCPClient {

    /**
     * @param args
     */
    public static void main(String[] args)throws Exception {
        // TODO Auto-generated method stub
        int num = args.length;
        if(num<=3){
            System.out.println("please input server ip port filefrom fileto!");
            System.exit(0);
        }
        System.out.println("host:"+args[0]);
        System.out.println("port:"+args[1]);
        System.out.println("filefrom:"+args[2]);
        System.out.println("fileto:"+args[3]);
        InetAddress addr = InetAddress.getByName(args[0]);
        Socket socket = 
              new Socket(addr, Integer.parseInt(args[1]));
        OutputStream out = socket.getOutputStream();
        byte[] cmd = new byte[128];
        byte[] tcmd = "cp".getBytes();
        for(int i=0;i<tcmd.length;i++){
            cmd[i] = tcmd[i];
        }
        cmd[tcmd.length] = ‘-0‘;
        out.write(cmd,0,cmd.length);
        //文件名称
        byte[] file = new byte[256];
        byte[] tfile = args[3].getBytes();
        for(int i=0;i<tfile.length;i++){
            file[i] = tfile[i];
        }
        file[tfile.length] = ‘-0‘;
        out.write(file,0,file.length);
        
        //大小
        File filein = new File(args[2]);
        byte[] size = new byte[64];
        byte[] tsize = (""+filein.length()).getBytes();
        
        for(int i=0;i<tsize.length;i++){
            size[i] = tsize[i];
        }
        size[tsize.length] = ‘-0‘;
        out.write(size,0,size.length);
        
        FileInputStream fis = null;
        byte[] buf = new byte[1024*10];
        //char[] bufC = new char[1024*10];
        fis = new FileInputStream(filein);
        int readsize = 0;
        //OutputStream ops = socket.getOutputStream();
        while((readsize = fis.read(buf, 0, buf.length))>0){
            out.write(buf,0,readsize);
            out.flush();
        }
        socket.close();
    }

}

java实现文件传输


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