java - 多线程 Java Web 服务器

Question

我正在尝试实现多线程 java 网络服务器。

这是我的主要内容:

import java.net.*;

public class Main {
    public static void main(String argv[]) throws Exception{

        ServerSocket welcomeSocket = new ServerSocket(6790);
        while(true){
            System.out.println("Waiting...");
            Socket cSock = welcomeSocket.accept();
            System.out.println("Accepted connection : " + cSock);

            Server a = new Server(cSock);
            a.start();


        }
    }
}

这是我的线程类:

import java.io.*;
import java.net.*;
import java.util.Scanner;


public class Server extends Thread{
    Socket cSock;

    Server(Socket cSock){   //constructor
        this.cSock = cSock;
    }

    public void run(){
        try{
            String request;
            Scanner inFromClient = new Scanner(cSock.getInputStream());
            DataOutputStream outToClient = new DataOutputStream(cSock.getOutputStream());
            request = inFromClient.nextLine();
            System.out.println("Received: "+request);

            //trimming URL to extract file name
            String reqMeth = request.substring(0, 3);
            String reqURL = request.substring(5, (request.lastIndexOf("HTTP/1.1")));
            String reqProto = request.substring(request.indexOf("HTTP/1.1"));
            System.out.println("Request Method:\t" +reqMeth +"\nRequest URL:\t" +reqURL+ "\nRequest Protocol: " +reqProto);

            //passing file name to open
            File localFile = new File(reqURL.trim());
            byte [] mybytearray  = new byte [(int)localFile.length()];
            FileInputStream fis = new FileInputStream(localFile);
            BufferedInputStream bis = new BufferedInputStream(fis);
            bis.read(mybytearray,0,mybytearray.length);

            //sending file to stream
            System.out.println("Sending...");           
            outToClient.write(mybytearray,0,mybytearray.length);
            outToClient.flush();
            outToClient.close();

        }catch(Exception e){
            System.out.println(e);
        }
    }
}

按照逻辑，服务器收到每个请求，都会创建一个新线程。每个线程都与一个特定的请求相关联。 我的问题是当我请求一个文件(例如 index.html)时，服务器收到请求，但文件没有加载，浏览器继续加载。

我发现每个线程都已启动但没有完成。

这是一个输出:

Waiting...
Accepted connection : Socket[addr=/192.168.0.10,port=58957,localport=6790]
Waiting...
Accepted connection : Socket[addr=/192.168.0.10,port=58958,localport=6790]
Waiting...
Received: GET /html/index.html HTTP/1.1
Request Method: GET
Request URL:    html/index.html 
Request Protocol: HTTP/1.1
Accepted connection : Socket[addr=/192.168.0.10,port=59093,localport=6790]
Waiting...
Received: GET /index.html HTTP/1.1
Request Method: GET
Request URL:    index.html 
Request Protocol: HTTP/1.1

我做错了什么？还有更好的方法吗？请注意，我只做了一个线程来测试来自一个 IP 的请求，并且将在解决此问题后继续构建。

Answer 1

您永远不会编写 HTTP header 。

outToClient.write("HTTP/1.0 200 OK\r\n");
outToClient.write("Connection: Close\r\n");
outToClient.write("\r\n");
outToClient.write(mybytearray,0,mybytearray.length);

如果您要实现自己的服务器，您应该阅读 RFC 2616 .