我正在构建一个在客户端和服务器之间交互的程序:
客户端发送一个对象,服务器操作它并将其发送回客户端。
通过命令行下发的ip是121.0.0.1(同一台电脑)。
但是,当我按下“开始”按钮时,似乎出现了我无法发现的僵局。
我做错了什么?
我所有的类(class)都在这里:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.Socket;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
@SuppressWarnings("serial")
public class ClientPanel extends JPanel {
JTextArea textArea;
JTextField textField;
JButton goButton;
InetAddress ip;
public ClientPanel(InetAddress ip) {
this.ip=ip;
setLayout(new BorderLayout());
setSize(200, 200);
textArea = new JTextArea();
textArea.setSize(50, 50);
add(textArea, BorderLayout.NORTH);
textField = new JTextField();
textField.setSize(100, 100);
add(textField, BorderLayout.CENTER);
goButton = new JButton("Go");
add(goButton, BorderLayout.PAGE_END);
goButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
IntData intData=new IntData(Integer.parseInt(textField.getText()));
textArea.append("Go button pressed. Text in field: " + textField.getText() + "\n "
+ "sending to server:"+intData);
Socket socket;
try {
socket = new Socket(ip,4444);
new GetBinaryThread(socket, intData);
} catch (IOException e1) {e1.printStackTrace();}
}
});
repaint();
}
private class GetBinaryThread extends Thread {
private Socket socket;
private ObjectOutputStream out;
private ObjectInputStream in;
private IntData dataToSend;
public GetBinaryThread(Socket socket, IntData data) {
this.socket = socket;
try {
out = new ObjectOutputStream(socket.getOutputStream());
out.flush();
in = new ObjectInputStream(socket.getInputStream());
dataToSend = data;
} catch (IOException e) {
e.printStackTrace();
}
}
public void run() {
try {
out.writeObject(dataToSend);
Object recievedObject = in.readObject();
// TODO show the object in text area
ClientPanel.this.textArea.append(", recieved" + ((IntData)recievedObject).getBinary());
out.close();
in.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
}
<小时/>
import java.net.InetAddress;
import java.net.UnknownHostException;
import javax.swing.JFrame;
public class LaunchClient {
static final int FRAME_WIDTH = 500, FRAME_HEIGHT = 500;
public static void main(String[] args) {
InetAddress ip = null;
if (args.length==0){
System.out.println("No args so no IP!");
}
try {
ip = InetAddress.getByName(args[0]);
} catch (UnknownHostException e) {
e.printStackTrace();
}
System.out.println(ip);
JFrame frame = new JFrame();
frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.add(new ClientPanel(ip));
frame.setVisible(true);
}
}
<小时/>
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class BinaryServer {
public static void main(String[] args) {
Socket socket;
ServerSocket serverSocket;
try {
serverSocket = new ServerSocket(4444);
boolean listening = true;
System.out.println("server ready...");
while (listening) {
socket = serverSocket.accept();
System.out.println("got socket");
new BinaryServerThread(socket).start();
}
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
<小时/>
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
public class BinaryServerThread extends Thread {
Socket socket = null;
ObjectInputStream in;
ObjectOutputStream out;
public BinaryServerThread(Socket socket) {
this.socket = socket;
try {
in = new ObjectInputStream(socket.getInputStream());
out = new ObjectOutputStream(socket.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
public void run() {
IntData dataFromClient;
try {
dataFromClient = ((IntData) in.readObject());
dataFromClient.generateBinary();
System.out.println("got data: "+dataFromClient);
out.writeObject(dataFromClient);
in.close();
out.close();
socket.close();
} catch (ClassNotFoundException | IOException e) {
e.printStackTrace();
}
}
}
<小时/>
public class IntData {
private Integer integer;
private String binary = "Not set";
public IntData(int x){
integer=x;
}
public void generateBinary() {
binary = Integer.toBinaryString(integer);
}
public int getInteger() {
return integer;
}
public void setInteger(int integer) {
this.integer = integer;
}
public String getBinary() {
return binary;
}
public void setBinary(String binary) {
this.binary = binary;
}
public String toString(){
return integer.toString();
}
}
最佳答案
如果我理解您的问题,问题是您在命令行上提供的 IP 地址
121.0.0.1
不是环回地址。你需要
127.0.0.1
或
localhost
关于java - 无法发现客户端/服务器程序中的死锁,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32019921/