Java中怎么组建和修改多线程服务器
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修改 acceptConnections() 以用缺省为 50(或任何您想要的大于 1 的指定数字)实例化 ServerSocket 。
修改 ServerSocket 的 handleConnection() 以用 ConnectionHandler 的一个实例生成一个新的 Thread 。
借用 RemoteFileServer 的 handleConnection() 方法的代码实现 ConnectionHandler 类。
附: MultithreadedRemoteFileServer 的完整代码清单
Java代码
import java.io.*; import java.net.*; public class MultithreadedRemoteFileServer { protected int listenPort; public MultithreadedRemoteFileServer(int aListenPort) { listenPort = aListenPort; } public void acceptConnections() { try { ServerSocket server = new ServerSocket(listenPort, 5); Socket incomingConnection = null; while (true) { incomingConnection = server.accept(); handleConnection(incomingConnection); } }catch (BindException e) { System.out.println("Unable to bind to port " + listenPort); } catch (IOException e) { System.out.println("Unable to instantiate a ServerSocket on port: " + listenPort); } } public void handleConnection(Socket connectionToHandle) { new Thread(new ConnectionHandler(connectionToHandle)).start(); } public static void main(String[] args) { MultithreadedRemoteFileServer server = new MultithreadedRemoteFileServer(3000); server.acceptConnections(); } } import java.io.*; import java.net.*; public class MultithreadedRemoteFileServer { protected int listenPort; public MultithreadedRemoteFileServer(int aListenPort) { listenPort = aListenPort; } public void acceptConnections() { try { ServerSocket server = new ServerSocket(listenPort, 5); Socket incomingConnection = null; while (true) { incomingConnection = server.accept(); handleConnection(incomingConnection); } } catch (BindException e) { System.out.println("Unable to bind to port " + listenPort); } catch (IOException e) { System.out.println("Unable to instantiate a ServerSocket on port: " + listenPort); } } public void handleConnection(Socket connectionToHandle) { new Thread(new ConnectionHandler(connectionToHandle)).start(); } public static void main(String[] args) { MultithreadedRemoteFileServer server = new MultithreadedRemoteFileServer(3000); server.acceptConnections(); } }
ConnectionHandler 的完整代码清单
Java代码
import java.io.*; import java.net.*; public class ConnectionHandler implements Runnable { protected Socket socketToHandle; public ConnectionHandler(Socket aSocketToHandle) { socketToHandle = aSocketToHandle; } public void run() { try { PrintWriter streamWriter = new PrintWriter(socketToHandle.getOutputStream()); BufferedReader streamReader = new BufferedReader(new InputStreamReader(socketToHandle.getInputStream())); String fileToRead = streamReader.readLine(); BufferedReader fileReader = new BufferedReader(new FileReader(fileToRead)); String line = null; while ((line = fileReader.readLine()) != null) streamWriter.println(line); fileReader.close(); streamWriter.close(); streamReader.close(); } catch (Exception e) { System.out.println("Error handling a client: " + e); } } }
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