Java套接字：以两种不同方式逐一读取/写入流

Question

About java.net.Socket and java.io. The server wants to send messages to a client, first use ObjectOutputStream to write(read, for client) an object, and then use BufferedWriter to write(read, for client)。

I can make it if I use ObjectXXXStream only or BufferedXXX only, but can't use them together on one stream. What should I do?

server:

oos = new ObjectOutputStream(client.getOutputStream());
oos.writeObject(dc);
// oos.close();

bw = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));          

bw.write("hahaha");
bw.flush();

while(true){
    line=br.readLine();
    if(line != null){
        ExecuteInput(line);
    }
}   

in client:

ois = new ObjectInputStream(socket.getInputStream());
XXX dc = (XXX) ois.readObject();
// ois.close();

String line;
while(true){
    try {
        // System.out.println("000000");
        line=br.readLine();
        // System.out.println("111111");
        if(line != null)
            System.out.println("aaaa "+line);
    } catch (IOException e) {
        System.out.println("222222");
        e.printStackTrace();
    }
}

Answer 1

You would use the ObjectOutputStream for both write operations. You cannot have 2 different types of streams for one socket, so you'd choose the most functional.

Although, I would question if sending objects is actually needed. You could instead send the state of the object and an "opcode" specifying what should be done with that state. But I don't know the purpose of dc , so I couldn't confirm

Answer 2

You can't use multiple streams/readers/writers on a socket when one or more of them is buffered, and both BufferedWriter and ObjectOutputStream are buffered.

Just use ObjectOutputStream() and either send everything as objects or else send the strings via writeUTF() , which means you have to read the strings with readUTF().