使用Java通过网络在计算机之间发送文件

Question

Hey, I have a project where, after serialising an array of objects, I have to send the file to another PC on the same network. I've googled "java networking" but some of the examples seem pretty complicated. What is the simplest way of achieving this? I have little/no networking experience beyond a basic understanding of IP addresses.

Answer 1

It depends on what you mean by "send a file". If the other PC has a shared drive that you can see over the network (eg in Windows explorer) then you can just copy it. FTP is another common option that would be pretty simple.

You could also look at using RMI to send the serialized data to another Java process.

Otherwise you might have to use the "complicated way". You'll probably find that it isn't as complicated as you might think you copy the examples and send the file as an array of bytes.

Answer 2

尝试看看Java RMI ，特别是有关通过网络发送序列化对象的知识。

Answer 3

I would try sending the data via JMS messaging like ActiveMQ . This way the producer/consumer don't even need to be running at the same time.

Here is an example http://www.javablogging.com/simple-guide-to-java-message-service-jms-using-activemq/

Answer 4

Follow the link below and you have a example of a file copy over TCP.

Link to example

Answer 5

使用套接字，看看这个例子

Answer 6

Simple java code will work for moving files between computers over a network.

public class FileCopier {

public static void main(String args[]) throws Exception {
//give your files location anywhere in same network   
File inboxDirectory = new File("data/inbox");    
//give your output location anywhere in same network where you want to save/copy files   
File outboxDirectory = new File("data/outbox");

    outboxDirectory.mkdir();

    File[] files = inboxDirectory.listFiles();
    for (File source : files) {
        if (source.isFile()) {
            File dest = new File(
                    outboxDirectory.getPath() 
                    + File.separator 
                    + source.getName()); 
            copyFile(source, dest);
        }
    }
}

private static void copyFile(File source, File dest) 
    throws IOException {
    OutputStream out = new FileOutputStream(dest);
    byte[] buffer = new byte[(int) source.length()];
    FileInputStream in = new FileInputStream(source);
    in.read(buffer);
    try {
        out.write(buffer);
    } finally {
        out.close();      
        in.close();
    }
}

}

otherwise you can also use apache camel for accessing files in same network between computers

public class FileCopierWithCamel {

public static void main(String args[]) throws Exception {

    CamelContext context = new DefaultCamelContext();


    context.addRoutes(new RouteBuilder() {
        public void configure() {
           // from("file:data/inbox?noop=true").to("file:data/outbox");
            from("file:data/inbox?noop=true").to("file:\\\\OthermachineName\\Output?autoCreate=true");  
        }
    });


    context.start();
   // Thread.currentThread().join();
   Thread.sleep(10000);


    context.stop();
}

}

Answer 7

You can simply create a shared folder for all of them and let them periodly check for new files.

Or you can write your own client server program so all clients listen on a specific port on which the server will send the file them.

Answer 8

我建议在KryoNet中使用RMI（与传统RMI相比设置很少）与RMIIO一起使用 。

Answer 9

如果您对Spring和Maven有一点经验，我会使用Apache Camel ， 这是一个示例 ， 该示例说明了如何通过FTP从Java程序向FTP服务器发送文件（在Spring的帮助下），但是Apache Camel可以理解很多协议，例如纯文件复制，通过邮件发送，通过消息队列发送...我真的认为Apache Camel仅缺少通过信鸽的运输。