[英]Send file over socket (with threading on server-side) - not working
我有一个客户端服务器程序。 客户端程序将文件发送到服务器,服务器接收到该文件。 我的问题是,该文件实际上没有在服务器上接收...我没有在服务器目录中创建file.txt,但是它是空的...(是的,我确定ne中的file.txt客户目录不为空;))我认为问题在于Client.java中的while循环,因为它从不尴尬。
为了将来,我现在在服务器端实现每个接收文件一个线程。
客户端程序:
package controller;
public class Main {
public static void main(String[] args) {
new Controller();
}
}
-
package controller;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
public class Controller {
public Controller() {
try {
sendFileToServer();
} catch (IOException e) {
e.printStackTrace();
}
}
public void sendFileToServer() throws UnknownHostException, IOException {
Socket socket = null;
String host = "localhost";
socket = new Socket(host, 5555);
String filename = "file.txt";
File file = new File(filename);
OutputStream outText = socket.getOutputStream();
PrintStream outTextP = new PrintStream(outText);
outTextP.println(filename);
long filesize = file.length();
byte[] bytes = new byte[(int) filesize];
FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis);
BufferedOutputStream out = new BufferedOutputStream(socket.getOutputStream());
int count;
System.out.println("Start sending file...");
while ((count = bis.read(bytes)) > 0) {
System.out.println("count: " + count);
out.write(bytes, 0, count);
}
System.out.println("Finish!");
out.flush();
out.close();
fis.close();
bis.close();
socket.close();
}
}
-
服务器程序:
import java.io.IOException;
public class Main {
public static void main(String[] args) throws IOException {
new Server();
}
}
-
public class Server {
private ServerSocket serverSocket;
public Server() {
try {
serverSocket = new ServerSocket(5555);
waitForClient();
} catch (IOException e) {
e.printStackTrace();
}
}
private void waitForClient() {
Socket socket = null;
try {
while(true) {
socket = serverSocket.accept();
Thread thread = new Thread(new Client(socket));
thread.start();
}
} catch (IOException ex) {
System.out.println("serverSocket.accept() failed!");
}
}
}
-
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Socket;
public class Client implements Runnable{
private Socket socket;
public Client(Socket socket) {
this.socket = socket;
}
@Override
public void run() {
receiveFile();
}
private void receiveFile() {
try {
InputStream is = null;
FileOutputStream fos = null;
BufferedOutputStream bos = null;
int bufferSize = 0;
InputStream outText = socket.getInputStream();
// Get filename
InputStreamReader outTextI = new InputStreamReader(outText);
BufferedReader inTextB = new BufferedReader(outTextI);
String dateiname = inTextB.readLine();
System.out.println("Dateiname: " + dateiname);
try {
is = socket.getInputStream();
bufferSize = socket.getReceiveBufferSize();
System.out.println("Buffer size: " + bufferSize);
} catch (IOException ex) {
System.out.println("Can't get socket input stream. ");
}
try {
fos = new FileOutputStream(dateiname);
bos = new BufferedOutputStream(fos);
} catch (FileNotFoundException ex) {
System.out.println("File not found.");
}
byte[] bytes = new byte[bufferSize];
int count;
while ((count = is.read(bytes)) > 0) {
bos.write(bytes, 0, count);
System.out.println("This is never shown!!!"); // In this while-loop the file is normally receiving and written to the directory. But this loop is never embarrassed...
}
bos.flush();
bos.close();
is.close();
socket.close();
}catch(IOException e) {
e.printStackTrace();
}
}
}
当您进行此类传输时,必须记住套接字的关闭与关闭之间是有区别的,在您的代码中,您将关闭客户端中的套接字。
因此,让我们看看会发生什么:您填充缓冲区,然后告诉套接字关闭,这将放弃您刚才要求的操作。 关闭时,您告诉套接字“我不会发送更多数据, 而是发送剩下的要发送的内容并关闭”,因此您需要做的是在关闭套接字之前先关闭套接字,以使数据到达。
所以代替这个
out.flush();
out.close();
fis.close();
bis.close();
socket.close();
试试这个
out.flush();
socket.shutdownInput(); // since you only send you may not need to call this
socket.shutdownOutput(); // with this you ensure that the data you "buffered" is sent
socket.close();
通常,如果您想要正常关闭,则即使在服务器上,也应在所有情况下都这样做,因此,如果出现错误,通常所做的事就可以了,因为您无法从错误中恢复,所以只需关闭连接即可。
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