socket从服务器端下载文件到本地

 

具体需求是这样的：
    server1有个文件x.war，server2发起一个http请求到服务器端server1下载文件x.war，具体的请求是http://server1/downloadservlet，然后这个请求会返回文件x.war，server2接到返回结果后直接把把该文件保存到目录c:/bak下。

在服务端起个socket监听，客户端链接，然后下载
以下例子是客户端将服务器上存放在d:\mp4\test.mp4保存到本地d:\test2.dat
但服务器只能处理单个请求，可以自己试试将它改成多线程支持，练习下下
package socket;
import java.io.*;
import java.net.*;


public class DataServer {

        /**
         * @param args
         */
        public static final int SERVICE_PORT=1500;
        public static final int DATA_SIZE=1024*30;
        public static void main(String[] args) {
                // TODO Auto-generated method stub
                String filePath="d:"+File.separator+"MP4"+File.separator+"test.MP4";
                File fileOut=new File(filePath);
                if(!fileOut.exists()){
                        System.out.println("File Not Found");
                        return;
                }
                
                try{
                        ServerSocket server = new ServerSocket(SERVICE_PORT);
                        System.out.println("Service started");
                        
                        for(;;){
                                Socket nextClient = server.accept();
                                System.out.println("Received request from " + nextClient.getInetAddress()+ ":"+ nextClient.getPort());
                                
                                
                                FileInputStream fis=new FileInputStream(fileOut);
                                OutputStream out =nextClient.getOutputStream();
                                PrintStream fileOutS = new PrintStream(out);
                                fileOutS.print(filePath+"\r\n");
                                
                                
                                byte[] bs = new byte[DATA_SIZE];
                                int length;
                                System.out.println("Sending data...");
                    while ( (length=fis.read(bs)) != -1){
                            out.write(bs,0,length);
                            bs = new byte[DATA_SIZE];
                            Thread.sleep(500);
                    }
                    System.out.println("Data sending completed");
                    fileOutS.close();
                                fis.close();
                                out.flush();
                                out.close();
                                nextClient.close();
                                
                        }
                        
                }catch(Exception e){
                        e.printStackTrace();
                }
                
        }

}


客户端
package socket;
import java.net.*;
import java.io.*;


public class DataClient {

        public static final int SERVICE_PORT = 1500;
        public static final int DATA_SIZE = 1024*60;
        /**
         * @param args
         */
        public static void main(String[] args) {
                // TODO Auto-generated method stub
                String hostName="192.168.10.201";
                
                String filePath="D:"+File.separatorChar+"test2.dat";
                        try{
                        Socket client = new Socket(hostName,SERVICE_PORT);
                        System.out.println("Connection established");
                        System.out.println(client.getRemoteSocketAddress());
                        client.setSoTimeout(2000);
                        File file=new File(filePath);
                        if(file.exists()){
                                file.delete();
                                System.out.println("Create new file");
                        }
                        InputStream in = client.getInputStream();
                        BufferedReader readerFile = new BufferedReader(
                                        new InputStreamReader(in));

                        DataInputStream reader = new DataInputStream(in);
                        
                        FileOutputStream fos = new FileOutputStream(file);
                        String filename=readerFile.readLine();
                        System.out.println(filename);
                        
                        
                        byte[] bs = new byte[DATA_SIZE];
                int length;
                System.out.println("Data receiving started");
                while( (length=reader.read(bs)) != -1){
                        fos.write(bs,0,length);
                        bs = new byte[DATA_SIZE];
                        Thread.sleep(200);
                }
                System.out.println("Receiving completed");
                readerFile.close();
                reader.close();
                fos.close();        
                }catch(Exception e){
                        e.printStackTrace();
                }

        }

}

评论

2 楼 greyfox4488 2009-07-22  

     

1 楼 javaww 2008-10-07  

我是socket初学者,请问:
怎样通过socket把数据库里查询出来的数据发送给客户端