Java服务器程序

转载自：http://langhua9527.iteye.com/blog/328174

运行此服务器程序的前提是首先在XP上安装IIS，然后在默认的服务器目录C:\Inetpub\wwwroot
下新建一个dog.html文件。之后，运行下文的程序WebServer.java，后在IE输入http://localhost/dog.html就行了。

WebServer.java

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

public class WebServer {   
    private void webStart(int port){   
        try {   
            //新建一个服务器ServerSocket   
            ServerSocket socketServer = new ServerSocket(port);   
            while(true){   
                //等待客户端的请求   
                Socket socket = socketServer.accept();   
                new Processor(socket).start();   
            }   
        } catch (IOException e) {   
            e.printStackTrace();   
        }   
    }   
    public static void main(String[] args) {   
        int port = 2011;   
        if(args.length == 1){   
            port = Integer.parseInt(args[0]);   
        }   
        //启动服务器   
        new WebServer().webStart(port);   
    }   
} 

Processor.java

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;

public class Processor extends Thread {   
    private Socket sockets;   
    private InputStream in;   
    //为方便使用PrintStream   
    private PrintStream out;       
    //限定访问的文件地址   
    private final static String WEB_ROOT = "C:\\Inetpub\\wwwroot
";   
  
    public Processor(Socket socket) {   
        this.sockets = socket;   
        try {   
            //初始化in,out   
            in = sockets.getInputStream();   
            out = new PrintStream(sockets.getOutputStream());   
        } catch (IOException e) {   
            e.printStackTrace();   
        }   
    }   
  
    public void run() {   
        String filename = parse(in);   
        sendFile(filename);   
    }   
    //读客户端传过来的信息,返回需要请求的文件名   
    public String parse(InputStream in) {   
        //建立一个BufferedReader读客户端传过来的信息   
        BufferedReader br = new BufferedReader(new InputStreamReader(in));   
        String filename = null;   
        try {   
            String httpMessage = br.readLine();   
            String[] content = httpMessage.split(" ");   
            if (content.length != 3) {   
                sendErrorMessage(400, "客户端请求错误");   
            }   
            System.out.println("code:" + content[0] + ",name:" + content[1]   
                    + ",http version" + content[2]);   
            filename = content[1];   
        } catch (IOException e) {   
            e.printStackTrace();   
        }   
        return filename;   
    }   
    //错误处理   
    public void sendErrorMessage(int errorCoder, String errorMessage) {   
  
    }   
    //读取本地文件   
    public void sendFile(String filename) {   
        File file = new File(Processor.WEB_ROOT + filename);   
        if (!file.exists()) {   
            this.sendErrorMessage(404, "文件名不存在错误");   
        }   
        try {   
            //读取本地文件,并放到content里面,再用out写到客户端那边   
            InputStream in = new FileInputStream(file);   
            byte[] content = new byte[(int) file.length()];   
            in.read(content);   
            out.write(content);   
            out.close();   
            in.close();   
  
        } catch (FileNotFoundException e) {   
            e.printStackTrace();   
        } catch (IOException e) {   
            e.printStackTrace();   
        }   
    }   
}