[英]Socket using in a swing applet
我应该用Java创建一个基于Swing和gui的服务器和客户端。我需要以某种方式建立一个从服务器到客户端,从客户端到服务器的套接字,并传递某种字符串.I我希望稍后有一个函数可以根据套接字中的字符串做几件事。
出于某种原因,我找不到一个简单的代码示例,它以简单的方式显示了它是如何完成的。
任何人都有任何简单的例子,或者可以解释它是如何完成的?
基于此示例 ,这是使用Swing的简单网络客户端 - 服务器对。 请注意与正确同步相关的一些问题:GUI本身是使用invokeLater()
在事件分派线程上构建的。 另外,代码依赖于append()
的线程安全性。 最后,它结合了Text Area Scrolling文章中的一个方便的提示。
更新:在Java 7中, append()
不再标记为线程安全; invokeLater()
用于display()
以对更新进行排序。
package net;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.Scanner;
import javax.swing.*;
import javax.swing.text.DefaultCaret;
/**
* A simple network client-server pair
* @http://stackoverflow.com/questions/3245805
*/
public class Echo implements ActionListener, Runnable {
private static final String HOST = "127.0.0.1";
private static final int PORT = 12345;
private final JFrame f = new JFrame();
private final JTextField tf = new JTextField(25);
private final JTextArea ta = new JTextArea(15, 25);
private final JButton send = new JButton("Send");
private volatile PrintWriter out;
private Scanner in;
private Thread thread;
private Kind kind;
public static enum Kind {
Client(100, "Trying"), Server(500, "Awaiting");
private int offset;
private String activity;
private Kind(int offset, String activity) {
this.offset = offset;
this.activity = activity;
}
}
public Echo(Kind kind) {
this.kind = kind;
f.setTitle("Echo " + kind);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getRootPane().setDefaultButton(send);
f.add(tf, BorderLayout.NORTH);
f.add(new JScrollPane(ta), BorderLayout.CENTER);
f.add(send, BorderLayout.SOUTH);
f.setLocation(kind.offset, 300);
f.pack();
send.addActionListener(this);
ta.setLineWrap(true);
ta.setWrapStyleWord(true);
DefaultCaret caret = (DefaultCaret) ta.getCaret();
caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
display(kind.activity + HOST + " on port " + PORT);
thread = new Thread(this, kind.toString());
}
public void start() {
f.setVisible(true);
thread.start();
}
//@Override
public void actionPerformed(ActionEvent ae) {
String s = tf.getText();
if (out != null) {
out.println(s);
}
display(s);
tf.setText("");
}
//@Override
public void run() {
try {
Socket socket;
if (kind == Kind.Client) {
socket = new Socket(HOST, PORT);
} else {
ServerSocket ss = new ServerSocket(PORT);
socket = ss.accept();
}
in = new Scanner(socket.getInputStream());
out = new PrintWriter(socket.getOutputStream(), true);
display("Connected");
while (true) {
display(in.nextLine());
}
} catch (Exception e) {
display(e.getMessage());
e.printStackTrace(System.err);
}
}
private void display(final String s) {
EventQueue.invokeLater(new Runnable() {
//@Override
public void run() {
ta.append(s + "\u23CE\n");
}
});
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
//@Override
public void run() {
new Echo(Kind.Server).start();
new Echo(Kind.Client).start();
}
});
}
}
一个基本的例子是:(基于Java中的Socket编程教程,APRajshekhar)
public static void main(String[] args) throws
UnknownHostException, IOException, InterruptedException {
Thread serverThread = new Thread(new Runnable() {
@Override
public void run() {
try {
// create the server socket
ServerSocket server = new ServerSocket(
8888, 5, InetAddress.getLocalHost());
// wait until clients try to connect
Socket client = server.accept();
BufferedReader in = new BufferedReader(new
InputStreamReader(client.getInputStream()));
// loop until the connection is closed
String line;
while ((line = in.readLine()) != null) {
// output what is received
System.out.println(line);
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
Thread clientThread = new Thread(new Runnable() {
@Override
public void run() {
try {
// connect with the server
Socket s = new Socket(InetAddress.getLocalHost(), 8888);
// attach to socket's output stream with auto flush turned on
PrintWriter out = new PrintWriter(s.getOutputStream(), true);
// send some text
out.println("Start");
out.println("End");
// close the stream
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
});
// start server
serverThread.start();
// wait a bit
Thread.sleep(1000);
// start client
clientThread.start();
}
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