JAVA编写简单的http服务器

JAVA编写简单的Http服务器：

package server;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class HttpServer
{
    public static void main(String[] args) throws IOException 
    {
        int port = 80;
        new HttpServer().start(port);
    }
    
    public void start(int port) throws IOException 
    {
        @SuppressWarnings("resource")
        ServerSocket server = new ServerSocket(port);
        System.out.println("Server has started at port: " + port);
        while(true)
        {
            Socket client = server.accept();
            Thread thread = new Thread(new Services(client));
            thread.start();
        }
    }
    
    class Services implements Runnable
    {
        Socket client;
        
        public Services(Socket client)
        {
            this.client = client;
        }
        
        private byte[] getResource(String resource) throws IOException
        {
            File file = new File(resource);
            FileInputStream fis = new FileInputStream(file);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[1000];
            int read;
            while((read = fis.read(buffer)) != -1)
            {
                baos.write(buffer, 0, read);
            }
            fis.close();
            baos.close();
            return baos.toByteArray();
        }
        
        private String getHead(String url)
        {
            //使用\对.进行正则表达式中的转义
            String[] arr = url.split("\.");
            String fileType = arr[arr.length - 1];
            if(fileType.equals("html"))
            {
                return "HTTP/1.0200OK
" + "Content-Type:text/html
" + "Server:myserver

";
            }
            else if(fileType.equals("jpg") || fileType.equals("gif") || fileType.equals("png"))
            {
                return "HTTP/1.0200OK
" + "Content-Type:image/jpeg
" + "Server:myserver

";
            }
            else
            {
                return null;
            }
        }
        
        @Override
        public void run()
        {
            try
            {
                InputStream is = client.getInputStream();
                OutputStream os = client.getOutputStream();
                client.setSoTimeout(500);
                String url = "";
                int state = 0;
                while(true)
                {
                    int readInt = is.read();
                    char c = (char)readInt;
                    boolean space = Character.isWhitespace(c);
                    switch (state)
                    {
                    case 0:
                        if(space) continue;
                        else state = 1;
                    case 1:
                        if(space)
                        {
                            state = 2;
                            continue;
                        }
                        else
                        {
                            continue;
                        }
                    case 2:
                        if(space) continue;
                        else state = 3;
                    case 3:
                        if(space) break;
                        else 
                        {
                            url += c;
                            continue;
                        }
                    }
                    break;
                }
                while(true)
                {
                    try
                    {
                        @SuppressWarnings("unused")
                        int readInt = is.read();
                    } 
                    catch(InterruptedIOException e)
                    {
                        byte[] data = getResource("webapp" + url);
                        os.write(getHead(url).getBytes("utf-8"));
                        os.write(data);
                        os.close();
                        break;
                    }
                }
            } 
            catch(IOException e)
            {
                e.printStackTrace();
            }
        }
    }
}

测试所用网页：

<html>
    <head>
        <title>
            A famous hero, hxy!
        </title>
    </head>
    <body>
        <h1 align="center">hxy's home page</h1>
        <h2 align="center">hxy's home page</h2>
        <h3 align="center">hxy's home page</h3>
        <h4 align="center">hxy's home page</h4>
        <h5 align="center">hxy's home page</h5>
    </body>
</html>

代码下载：https://github.com/SplayHuo/JavaProject