Java Sockets TCP 发送和接收

Question

我尝试了很多例子，但没有一个按照我的预期工作。我需要什么？

1. 通过 IP 和端口发送数据包。
2. 等待服务器响应并关闭套接字。

示例:

[Client] Send: "Hi server"
[Client] Wait
[Server] Send: "Hi client"
[Client] Receive response
[Client] Close socket

我只需要TCP客户端，服务器端就解决了。

尝试过: http://www.careerbless.com/samplecodes/java/beginners/socket/SocketBasic1.php

我的代码

public class SendPacket {

    public void send() throws Exception{

        Socket socket = null;
        ObjectOutputStream oos = null;
        ObjectInputStream ois = null;

        socket = new Socket(ip, port);
        oos = new ObjectOutputStream(socket.getOutputStream());

        String msg = "DSPSYSSTS";
        oos.write(msg.getBytes());
        oos.flush();

        //read the server response message
        ois = new ObjectInputStream(socket.getInputStream());
        String message = (String) ois.readObject();

        RunWinCmd runCmd = new RunWinCmd();
        runCmd.run("notepad.exe \"" + message + "\"");
        //close resources
        ois.close();
        oos.close();

    }
}

Answer 1

您必须按特定顺序初始化流。

试试这个(未测试):

public class SendPacket {

    public void send() throws Exception{

        Socket socket = null;
        ObjectOutputStream oos = null;
        ObjectInputStream ois = null;

        socket = new Socket(ip, port);
        oos = new ObjectOutputStream(socket.getOutputStream());
        ois = new ObjectInputStream(socket.getInputStream());

        String msg = "DSPSYSSTS";
        oos.write(msg.getBytes());
        oos.flush();

        //read the server response message
        String message = (String) ois.readObject();

        RunWinCmd runCmd = new RunWinCmd();
        runCmd.run("notepad.exe \"" + message + "\"");
        //close resources
        ois.close();
        oos.close();
        socket.close();//!!!!

    } }