我尝试使用套接字编程设置客户端服务器应用程序。我的客户端连接到服务器，但我无法使多事件处理工作。我的客户端小程序有两个文本框和按钮，每个文本框和按钮都与它们相关联。当我点击第一个按钮时，我试图得到＆＃34;你好＆＃34;显示在文本框中。当我点击按钮2时，我试图得到＆＃34;你好那里＆＃34;显示在第二个文本框中。但是，只有一个值（我第一次点击的值）显示在两个文本框中。我的事件处理机制不正确吗？我正在实现可序列化接口，客户端服务器通信处理对象。有人可以告诉我代码中的问题是什么吗？我还没有发布ObjectCommunication.java代码，但它只是实现了可序列化的接口，并且有getter和setter（以字符串作为输入参数）方法。
非常感谢！
以下是我的服务器代码：
import java.io.*;
import java.net.*;
public class Server_App {
public static void main(String[] args) {
try {
ServerSocket holder = new ServerSocket(4500);
for (;;) {
Socket incoming = holder.accept();
new ServerThread(incoming).start();
}
} catch (Exception e) {
System.out.println(e);
}
}
}
class ServerThread extends Thread
{
public ServerThread(Socket i) {
incoming = i;
}
public void run() {
try {
ObjectCommunication hold = new ObjectCommunication();
ObjectInputStream input = new ObjectInputStream(incoming.getInputStream());
ObjectOutputStream output = new ObjectOutputStream(incoming.getOutputStream());
hold = (ObjectCommunication) input.readObject();
if ((hold.getMessage()).equals("Event 1")) {
System.out.println("Message read: " + hold.getMessage());
hold.setMessage("Hello!");
} else if ((hold.getMessage()).equals("Event 2")) {
System.out.println("Message read:" + hold.getMessage());
hold.setMessage("Hello there!");
}
output.writeObject(hold);
input.close();
output.close();
incoming.close();
} catch (Exception e) {
System.out.println(e);
}
}
ObjectCommunication hold = null;
private Socket incoming;
}
以下是客户端代码：
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
public class Client_App extends Applet {
TextField textVal;
TextField anotherTextVal;
Socket socket;
ObjectCommunication hold = new ObjectCommunication();
ObjectCommunication temp = new ObjectCommunication();
ObjectOutputStream OutputStream;
ObjectInputStream InputStream;
public void init() {
socketConnection();
createGUI();
validate();
}
public void socketConnection() {
try {
socket = new Socket("127.0.0.1", 4500);
} catch (Exception e) {
System.out.println("Unknown Host");
}
try {
OutputStream = new ObjectOutputStream(socket.getOutputStream());
InputStream = new ObjectInputStream(socket.getInputStream());
} catch (IOException ex) {
System.out.println("Error: " + ex);
return;
}
}
public void createGUI() {
Button button = new Button("Hello Button");
add(button);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
button_actionPerformed(evt);
}
});
textVal = new TextField(6);
add(textVal);
Button anotherButton = new Button("Hello there Button");
add(anotherButton);
anotherButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
anotherButton_actionPerformed(evt);
}
});
anotherTextVal = new TextField(6);
add(anotherTextVal);
}
public void button_actionPerformed(ActionEvent e) {
String actionCommand = e.getActionCommand();
if (e.getSource() instanceof Button)
if (actionCommand.equals("Hello Button")) {
try {
temp.setMessage("Event 1");
//OutputStream.writeObject(temp);
new SendToServer().start();
new ListenToServer().start();
} catch (Exception ex) {
System.out.println("Communication didn't work!");
}
textVal.setText(hold.getMessage());
}
}
public void anotherButton_actionPerformed(ActionEvent evt) {
String action_Command = evt.getActionCommand();
if (evt.getSource() instanceof Button)
if (action_Command.equals("Hello there Button")) {
try {
temp.setMessage("Event 2");
new SendToServer().start();
new ListenToServer().start();
} catch (Exception ex) {
System.out.println("Communication didn't work!");
}
anotherTextVal.setText(hold.getMessage());
}
}
class ListenToServer extends Thread {
public void run() {
while (true) {
try {
hold = (ObjectCommunication) InputStream.readObject();
} catch (IOException e) {} catch (ClassNotFoundException e2) {}
}
}
}
class SendToServer extends Thread {
public void run() {
while (true) {
try {
OutputStream.writeObject(temp);
} catch (IOException e) {}
}
}
}
}
答案 0 :(得分：0)
说实话 - 我有点懒得阅读你的代码并在那里寻找一个错误:)但是我会在这里发布你的socket-based multiple client-server应用程序代码片段。
import java.net.*;
import java.io.*;
class ServeConnection extends Thread {
private Socket socket = null;
private BufferedReader in = null;
private PrintWriter out = null;
public ServeConnection(Socket s) throws IOException {
// init connection with client
socket = s;
try {
in = new BufferedReader(new InputStreamReader(
this.socket.getInputStream()));
out = new PrintWriter(this.socket.getOutputStream(), true);
} catch (IOException e) {
System.err.println("Couldn't get I/O.");
System.exit(1);
}
start();
}
public void run() {
System.out.println("client accepted from: " + socket.getInetAddress()
+ ":" + socket.getPort());
// get commands from client, until is he communicating or until no error
// occurs
String inputLine, outputLine;
try {
while ((inputLine = in.readLine()) != null) {
System.out.println("request: " + inputLine);
outputLine = inputLine;
out.println("I've recived "+outputLine);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("server ending");
out.close();
try {
in.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
class Server {
public static void svr_main(int port) throws IOException {
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(port);
} catch (IOException e) {
System.err.println("Could not listen on port: " + port);
System.exit(1);
}
System.out.println("Server ready");
try {
while (true) {
Socket socket = serverSocket.accept();
try {
new ServeConnection(socket);
} catch (IOException e) {
System.err.println("IO Exception");
}
}
} finally {
serverSocket.close();
}
}
}
class Client {
static Socket echoSocket = null;
static PrintWriter out = null;
static BufferedReader in = null;
public static void cli_main(int port, String servername) throws
IOException {
try {
echoSocket = new Socket(servername, port);
out = new PrintWriter(echoSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(
echoSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: " + servername);
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for " + servername);
System.exit(1);
}
System.out.println("Client ready!");
while (true) {
inputLine = (in.readLine().toString());
if (inputLine == null) {
System.out.println("Client closing!");
break;
}
// get the input and tokenize it
String[] tokens = inputLine.split(" ");
}
out.close();
in.close();
echoSocket.close();
System.out.println("Client closing");
}
}
public class MyClientServerSnippet{
public static void main(String[] args) throws IOException {
if (args.length == 0) {
System.err.println("Client: java snippet.MyClientServerSnippet<hostname> <port>");
System.err.println("Server: java snippet.MyClientServerSnippet<port>");
System.exit(1);
}
else if (args.length > 1) {
System.out.println("Starting client...\n");
Client client = new Client();
client.cli_main(3049, "127.0.0.1");
} else {
System.out.println("Starting server...\n");
Server server = new Server();
server.svr_main(3049);
}
}
}
希望这会有所帮助：]如果有什么是不可理解的，请不要犹豫，询问更多细节：）