一个单文件服务器（摘自《java网络编程》）

ackage net.programe.ten;

import java.io.*;
import java.net.*;

/**
 *发送相同文件的http服务器,
 * 想每个客户端都发送相同的内容
 * @author Arthur
 */
public class SingleFileHttpServer extends Thread {
    //发送数据的正文

    private byte[] content;
    //发送数据的首部
    private byte[] header;
    //默认端口为80
    private int port = 80;

    public SingleFileHttpServer(String data, String encoding, String MIMEType, int port)
            throws UnsupportedEncodingException {
        this(data.getBytes(encoding), encoding, MIMEType, port);
    }

    public SingleFileHttpServer(byte[] data, String encoding, String MIMEType, int port)
            throws UnsupportedEncodingException {
        this.content = data;
        this.port = port;
        String header = "HTTP/1.0 200 OK\r\n"
                + "Server:OneFile 1.0\r\n"
                + "Content-length:" + this.content.length + "\r\n"
                + "Content-type" + MIMEType + "\r\n\r\n";
        this.header = header.getBytes("ASCII");
    }

    @Override
    public void run() {
        try {
            //创建服务器socket
            ServerSocket server = new ServerSocket(this.port);
            System.out.println("接收来自端口为" + server.getLocalPort() + "的客户端的连接");
            while (true) {
                Socket conn = null;
                try {
                    conn = server.accept();
                    //定义一个输出流，用来向客户端发送数据
                    OutputStream out = new BufferedOutputStream(conn.getOutputStream());
                    //定义一个输入流，用来读取客户端发来的数据
                    InputStream in = new BufferedInputStream(conn.getInputStream());
                    //创建字符缓冲区,初始容量为80个字符
                    StringBuffer request = new StringBuffer(80);
                    //只读取一行
                    while (true) {
                        //读取一个字节的数据
                        int c = in.read();
                        if (c == '\r' || c == '\n' || c == -1) {
                            break;
                        }
                        request.append((char) c);
                    }//end while
                    //如果是HTTP/1.0或者以后的版本，就发送一个MIME首部
                    if (request.toString().indexOf("HTTP/") != -1) {
                        //向客户端发送消息
                        out.write(this.header);
                    }
                    //发送context
                    out.write(content);
                    //涮新
                    out.flush();
                } catch (IOException ex) {
                }
            }//end while
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }//end run

    public static void main(String[] args) throws UnsupportedEncodingException {
        String encoding = "ASCII";
        byte content[] = "hello java net".getBytes(encoding);
        Thread t = new SingleFileHttpServer(content, encoding, "text/html", 80);
        t.start();

    }
}