将可运行类放入自己的线程中
嘿，所有Java新手都可以肯定这很简单，但无法正确获取以使其正常工作。
此可运行类的原始Java代码：
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class ChatServer {
private static Set < String > names = new HashSet < > ();
private static Set < PrintWriter > writers = new HashSet < > ();
public static int thePort = 8877;
private static boolean isPortInUse(String host, int port) throws SocketException {
boolean result = false;
try {
(new Socket(host, port)).close();
result = true;
} catch (IOException e) {
// Could not connect.
}
return result;
}
@SuppressWarnings("unused")
public static void main(String[] args) throws Exception {
System.out.println("The chat server is running...");
ExecutorService pool = Executors.newFixedThreadPool(500);
boolean hasPort = isPortInUse("localhost", thePort);
try (ServerSocket listener = new ServerSocket(thePort)) {
while (true) {
pool.execute(new Handler(listener.accept()));
}
}
}
private static class Handler implements Runnable {
private String name;
private Socket socket;
private Scanner in ;
private PrintWriter out;
public Handler(Socket socket) {
this.socket = socket;
}
public void run() {
try {
in = new Scanner(socket.getInputStream());
out = new PrintWriter(socket.getOutputStream(), true);
while (true) {
out.println("SUBMITNAME");
name = in .nextLine();
if (name == null) {
return;
}
synchronized(names) {
if (!name.isEmpty() && !names.contains(name)) {
names.add(name);
break;
}
}
}
out.println("NAMEACCEPTED " + name);
for (PrintWriter writer: writers) {
writer.println("MESSAGE " + name + " has joined");
}
writers.add(out);
while (true) {
String input = in .nextLine();
if (input.toLowerCase().startsWith("/quit")) {
return;
}
for (PrintWriter writer: writers) {
writer.println("MESSAGE " + name + ": " + input);
}
}
} catch (Exception e) {
System.out.println(e);
} finally {
if (out != null) {
writers.remove(out);
}
if (name != null) {
System.out.println(name + " has left");
names.remove(name);
for (PrintWriter writer: writers) {
writer.println("MESSAGE " + name + " has left");
}
}
try {
socket.close();
} catch (IOException e) {}
}
}
}
}
我创建的线程代码是这样的：
static Thread serverThread = new Thread(new Runnable() {
private String name;
private Socket socket;
private Scanner in ;
private PrintWriter out;
@Override
public void run() {
try {
Set < String > names = new HashSet < > ();
Set < PrintWriter > writers = new HashSet < > ();
int thePort = 8877;
System.out.println("The chat server is running...");
ExecutorService pool = Executors.newFixedThreadPool(500);
boolean hasPort = isPortInUse("localhost", thePort);
try (ServerSocket listener = new ServerSocket(thePort)) {
while (true) {
pool.execute(new Handler(listener.accept()));
}
}
try {
in = new Scanner(socket.getInputStream());
out = new PrintWriter(socket.getOutputStream(), true);
while (true) {
out.println("SUBMITNAME");
name = in .nextLine();
if (name == null) {
return;
}
synchronized(names) {
if (!name.isEmpty() && !names.contains(name)) {
names.add(name);
break;
}
}
}
out.println("NAMEACCEPTED " + name);
for (PrintWriter writer: writers) {
writer.println("MESSAGE " + name + " has joined");
}
writers.add(out);
while (true) {
String input = in .nextLine();
if (input.toLowerCase().startsWith("/quit")) {
return;
}
for (PrintWriter writer: writers) {
writer.println("MESSAGE " + name + ": " + input);
}
}
} catch (Exception e) {
System.out.println(e);
} finally {
if (out != null) {
writers.remove(out);
}
if (name != null) {
System.out.println(name + " has left");
names.remove(name);
for (PrintWriter writer: writers) {
writer.println("MESSAGE " + name + " has left");
}
}
try {
socket.close();
} catch (IOException e) {}
}
} catch (Exception e) {
System.out.println(e);
}
}
public void Handler(Socket socket) {
this.socket = socket;
}
private boolean isPortInUse(String host, int port) throws SocketException {
boolean result = false;
try {
(new Socket(host, port)).close();
result = true;
} catch (IOException e) {
// Could not connect.
}
return result;
}
});
上述所有代码中仅有的2个错误是：
处理程序无法解析为类型
上
pool.execute(new Handler(listener.accept()));
和
该方法的返回类型丢失
在
public Handler(Socket socket) {
那么我需要更改什么才能替换Handler，以便它可以与我创建的线程代码一起使用？
更新＃1
我在主类中同时调用服务器和客户端的
@SuppressWarnings({ "resource", "unused" })
private static void placeChatOnScreen() {
textField = new JTextField();
textField.setFont(new Font("Segoe UI", Font.PLAIN, 13));
textField.setDragEnabled(true);
textField.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
textField.setBounds(338, 838, 954, 22);
frame.getContentPane().add(textField);
messageArea = new JTextArea();
messageArea.setEditable(false);
messageArea.setFont(new Font("Segoe UI", Font.PLAIN, 13));
messageArea.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
messageArea.setDragEnabled(true);
messageArea.setName("chatArea");
messageArea.setWrapStyleWord(true);
messageArea.setBounds(338, 648, 954, 181);
frame.getContentPane().add(messageArea);
textField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
out.println(textField.getText());
textField.setText("");
}
});
// start server
final Thread serverThread = new Thread(new Handler());
serverThread.start();
// wait a bit
Thread.sleep(1000);
// start client
clientThread.start();
}
这是服务器类（就像您说的那样）：
public class ChatServer {
private static Set<String> names = new HashSet<>();
private static Set<PrintWriter> writers = new HashSet<>();
public static int thePort = 8877;
private static boolean isPortInUse(String host, int port) throws SocketException {
boolean result = false;
try {
(new Socket(host, port)).close();
result = true;
}
catch(IOException e) {
// Could not connect.
}
return result;
}
@SuppressWarnings("unused")
public static void main(String[] args) throws Exception {
System.out.println("The chat server is running...");
ExecutorService pool = Executors.newFixedThreadPool(500);
boolean hasPort = isPortInUse("localhost", thePort);
try (ServerSocket listener = new ServerSocket(thePort)) {
while (true) {
pool.execute(new Handler(listener.accept()));
}
}
}
public static class Handler implements Runnable {
private String name;
private Socket socket;
private Scanner in;
private PrintWriter out;
public Handler(Socket socket) {
this.socket = socket;
}
public void run() {
try {
in = new Scanner(socket.getInputStream());
out = new PrintWriter(socket.getOutputStream(), true);
while (true) {
out.println("SUBMITNAME");
name = in.nextLine();
if (name == null) {
return;
}
synchronized (names) {
if (!name.isEmpty() && !names.contains(name)) {
names.add(name);
break;
}
}
}
out.println("NAMEACCEPTED " + name);
for (PrintWriter writer : writers) {
writer.println("MESSAGE " + name + " has joined");
}
writers.add(out);
while (true) {
String input = in.nextLine();
if (input.toLowerCase().startsWith("/quit")) {
return;
}
for (PrintWriter writer : writers) {
writer.println("MESSAGE " + name + ": " + input);
}
}
} catch (Exception e) {
System.out.println(e);
} finally {
if (out != null) {
writers.remove(out);
}
if (name != null) {
System.out.println(name + " has left");
names.remove(name);
for (PrintWriter writer : writers) {
writer.println("MESSAGE " + name + " has left");
}
}
try { socket.close(); } catch (IOException e) {}
}
}
}
}
更新＃2
1 个答案:
答案 0 :(得分：0)
您声明了一个private类，其他类将无法访问该类
private static class Handler implements Runnable { ... }
因此，如果它们共享同一包，只需将其标记为public或package-private（无修饰符）即可。
public static class Handler implements Runnable { ... }
然后，做
final Thread serverThread = new Thread(new Handler());
serverThread.start();
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