[英]Java Multi threaded server not working as expected
我正在嘗試編寫一個多線程服務器,該服務器應該能夠一次接受多個HTTP請求。
服務器代碼:
package test.thread.server;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class MyServer implements Runnable {
private int serverPort = 8080;
private ServerSocket serverSocket;
private Thread runningThread;
private boolean isStopped;
public MyServer(int port){
this.serverPort = port;
}
@Override
public void run() {
synchronized (this) {
this.runningThread = Thread.currentThread();
}
openServerSocket();
while(!isStopped){
Socket clientSocket = null;
try {
clientSocket = this.serverSocket.accept();
} catch (IOException e) {
e.printStackTrace();
}
//start a new thread for processing each request
new Thread(new RequestHandler(clientSocket)).start();
}
}
public synchronized void stop(){
this.isStopped = true;
try {
this.serverSocket.close();
} catch (IOException e) {
throw new RuntimeException("Error closing server", e);
}
}
private void openServerSocket(){
try {
this.serverSocket = new ServerSocket(this.serverPort);
} catch (IOException e) {
e.printStackTrace();
}
}
}
處理請求的工作人員:
它從輸入流中讀取數據並進行打印。 之后,它應該進行30秒鍾的睡眠(表示不需要CPU的某些工作)。 睡眠時間過后,服務器將響應客戶端。
package test.thread.server;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Date;
public class RequestHandler implements Runnable {
Socket clientSocket;
static int counter = 0;
public RequestHandler(Socket clientSocket){
this.clientSocket = clientSocket;
}
@Override
public void run() {
try {
InputStream input = this.clientSocket.getInputStream();
OutputStream output = this.clientSocket.getOutputStream();
DataInputStream inFromClient = new DataInputStream(input);
System.out.println(new Date()+": " +Thread.currentThread().getName() + " - Started : "+inFromClient.readUTF());
Thread.sleep(30000);
/*output.write(("HTTP/1.1 200 OK\n\n<html><body>" +
"Multi-threaded Server " +
"</body></html>").getBytes());*/
DataOutputStream outFromServer = new DataOutputStream(output);
outFromServer.writeUTF("Output");
outFromServer.flush();
output.close();
input.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
HTTP客戶端:
客戶端不必擔心服務器的睡眠時間,它將連續發送5個請求。
package test.thread.server;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Date;
public class MyClient {
public static void main(String[] args) throws UnknownHostException, IOException {
// TODO Auto-generated method stub
for(int i=0; i<5; i++){
Socket clientSocket = new Socket("localhost", 8080);
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
DataInputStream inFromServer = new DataInputStream(clientSocket.getInputStream());
outToServer.writeUTF("Input");
outToServer.flush();
String output = inFromServer.readUTF();
System.out.println(new Date()+": "+output);
clientSocket.close();
}
}
}
現在,我希望服務器在一個線程進入睡眠狀態時處理下一個客戶端請求。 但是很遺憾,服務器僅在處理前一個請求之后才接受下一個請求。
期望o / p:
服務器不應等待當前請求過程完成,然后再為下一個請求打印“ Thread-X-Started:Input”。
當前輸出:
Server: Wed Feb 15 18:17:06 IST 2017: Thread-1 - Started : Input
Client: Wed Feb 15 18:17:36 IST 2017: Output
Server:Wed Feb 15 18:17:36 IST 2017: Thread-2 - Started : Input
Client:Wed Feb 15 18:18:06 IST 2017: Output
Server:Wed Feb 15 18:18:06 IST 2017: Thread-3 - Started : Input
Client:Wed Feb 15 18:18:36 IST 2017: Output
Server:Wed Feb 15 18:18:43 IST 2017: Thread-4 - Started : Input
Client:Wed Feb 15 18:19:13 IST 2017: Output
Server:Wed Feb 15 18:19:13 IST 2017: Thread-5 - Started : Input
Client:Wed Feb 15 18:19:43 IST 2017: Output
可能是什么問題?
我相信問題出在您的客戶身上。 客戶端僅在回答前一個請求后才發送下一個請求。 inFromServer.readUTF()
阻塞,直到有可用數據為止,這僅在服務器發送實際答案時才會發生。
我建議您調試程序。
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