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[英]Java SocketChannel send multiple files over one socketchannel possible?
[英]Send multiple files using Java NIO SocketChannel
我已嘗試根據本指南使用java NIO套接字通道發送文件。 工作正常。 我修改了發送文件列表的方法。 基本上,我循環瀏覽上述指南中已實現的文件列表和調用發送方法。 出現錯誤“地址已在使用中”,因此我在FileSender類中注釋了套接字結束行。 之后,代碼中沒有錯誤。 程序似乎卡在中間。 我該如何解決這個問題? 有沒有更好的方法來解決問題?
主Java
public static void main(String[] args) throws IOException, InterruptedException{
RunningConfiguration.run();
List<File> files = new <File>ArrayList();
File a = new File("pics/city.jpg");
File b = new File("pics/desert.jpg");
File c = new File("pics/flower.jpg");
File d = new File("pics/night.jpg");
List<Node> nodes = RunningConfiguration.getNodeList();
ListIterator li = nodes.listIterator();
while(li.hasNext()){
Node node = (Node)li.next();
FileSender.send(node, files, "pics/received/");
}
}
FileSender.Java
public class FileSender {
private final InetSocketAddress fileSocketAddress;
private final File file;
public FileSender(InetAddress inetAddress, File file) throws IOException{
this.fileSocketAddress = new InetSocketAddress(inetAddress,RunningConfiguration.FILE_PORT);
this.file = file;
}
public static void send(InetSocketAddress inetSocketAddress, File file) throws IOException{
FileSender nioClient = new FileSender(inetSocketAddress.getAddress(),file);
SocketChannel socketChannel = nioClient.createChannel();
nioClient.sendFile(socketChannel);
}
public static void send(Node to, File file) throws IOException{
FileSender nioClient = new FileSender(to.getSocketAddress().getAddress(),file);
SocketChannel socketChannel = nioClient.createChannel();
nioClient.sendFile(socketChannel);
}
public static void send(Node to, File file,String filepath) throws IOException{
FileSender nioClient = new FileSender(to.getSocketAddress().getAddress(),file);
SocketChannel socketChannel = nioClient.createChannel();
nioClient.sendFile(socketChannel);
}
public static void send(Node to,List<File> files,String filepath) throws IOException{
ListIterator ltr = files.listIterator();
while(ltr.hasNext()){
File file = (File) ltr.next();
FileSender nioClient = new FileSender(to.getSocketAddress().getAddress(),file);
SocketChannel socketChannel = nioClient.createChannel();
nioClient.sendFile(socketChannel);
}
}
public SocketChannel createChannel() {
SocketChannel socketChannel = null;
try {
socketChannel = SocketChannel.open();
SocketAddress socketAddress = this.fileSocketAddress;
socketChannel.connect(socketAddress);
System.out.println("Connected..Now sending the file");
} catch (IOException e) {
e.printStackTrace();
}
return socketChannel;
}
public void sendFile(SocketChannel socketChannel) {
RandomAccessFile aFile = null;
try {
//File file = new File("data\\web.exe");
aFile = new RandomAccessFile(this.file, "r");
FileChannel inChannel = aFile.getChannel();
ByteBuffer buffer = ByteBuffer.allocate(1024);
while (inChannel.read(buffer) > 0) {
buffer.flip();
socketChannel.write(buffer);
buffer.clear();
}
Thread.sleep(400);
System.out.println("End of file reached..");
socketChannel.close();
aFile.close();
} catch (FileNotFoundException e ) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
FileReceiver.java
private String fileName;
public FileReceiver(String fileName) {
this.fileName = fileName;
}
public static void receive(String fileName) {
FileReceiver nioServer = new FileReceiver(fileName);
SocketChannel socketChannel = nioServer.createServerSocketChannel();
nioServer.readFileFromSocket(socketChannel);
}
public FileReceiver() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
public SocketChannel createServerSocketChannel() {
ServerSocketChannel serverSocketChannel = null;
SocketChannel socketChannel = null;
try {
System.out.println("File receiver listening at port: " + RunningConfiguration.FILE_PORT);
serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(RunningConfiguration.FILE_PORT));
socketChannel = serverSocketChannel.accept();
System.out.println("Connection established...." + socketChannel.getRemoteAddress());
} catch (IOException e) {
e.printStackTrace();
}
return socketChannel;
}
/**
* Reads the bytes from socket and writes to file
*
* @param socketChannel
*/
public void readFileFromSocket(SocketChannel socketChannel) {
RandomAccessFile aFile = null;
try {
aFile = new RandomAccessFile(this.fileName, "rw");
ByteBuffer buffer = ByteBuffer.allocate(1024);
FileChannel fileChannel = aFile.getChannel();
while (socketChannel.read(buffer) > 0) {
buffer.flip();
fileChannel.write(buffer);
buffer.clear();
}
// Thread.sleep(1000);
fileChannel.close();
System.out.println("End of file reached..Closing channel");
socketChannel.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}/*} catch (InterruptedException e) {
e.printStackTrace();
}*/
}
您需要在文件之前發送長度(可能是名稱),以便接收方知道何時停止。 接收器必須確保只讀取那么多字節,這可能需要減少最后一次讀取的limit
。 另外,您的復制循環不正確:
while (inChannel.read(buffer) > 0) {
buffer.flip();
socketChannel.write(buffer);
buffer.clear();
}
在流的末尾不一定能正常工作。 它應該是:
while (inChannel.read(buffer) >= 0 || buffer.position() > 0) {
buffer.flip();
socketChannel.write(buffer);
buffer.compact(); // NB compact(), not clear()
}
再次指出,他們將需要如上所述的進一步修改。
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