【java web】编写自己的多线程的简单Web服务器，并访问图片资源

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

public class HttpServer {//主线程

  public static void main(String[] args) 
  {

    int port;
    //获得端口号
    ServerSocket serverSocket;
    try
    {
      port=Integer.parseInt(args[0]);
      
    }
    catch(Exception e)
    {
      port=8888;
    }
    
    
    
    try
    {
      serverSocket=new ServerSocket(port);
      
      while(true)
      {
        final Socket socket=serverSocket.accept();
        Service s = new Service(socket);
        Thread t = new Thread(s);
        t.start();  
      }
      
    }
    catch(Exception e){e.printStackTrace();}
    
    
  }
  
  
  
}      


class Service implements Runnable//分线程
{
  private Socket socket;

  public Service(Socket socket) {
    this.socket = socket;
  }
  @Override
  public void run() {
    // TODO Auto-generated method stub
    try {
      service(this.socket);
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
  
  public static void service(Socket socket)throws Exception
  {
    /*读取http请求信息*/
    InputStream socketIn=socket.getInputStream();
    Thread.sleep(500);
    int size=socketIn.available();
    byte[] buffer=new byte[size];
    socketIn.read(buffer);
      String request=new String(buffer);
      
      /*解析Http请求数据*/
      //获得请求的第一行信息
      String firstLineOfRequest=request.substring(0,request.indexOf("\r\n"));
      
      //解析第一行信息
      String[] parts=firstLineOfRequest.split(" ");
      String uri=parts[1];
      
      /*得到http响应正文的类型*/
      String contentType;
      if(uri.indexOf("html")!=-1  || uri.indexOf("htm")!=-1)
        contentType="text/html";
      else if (uri.indexOf("jpg")!=-1  || uri.indexOf("jpeg ")!=-1)
        contentType="image/jpeg";
      else if (uri.indexOf("gif")!=-1)
        contentType="image/gif";
      else
        contentType="application/octet-stream";
      
        System.out.println(uri);
      /*响应*/
      String responseFirstLine="HTTP/1.1 200 OK\r\n";
      String responseHeader="Content-Type:"+contentType+"\r\n\r\n";
      InputStream in=HttpServer.class.getResourceAsStream("root"+uri);
      
      OutputStream socketOut=socket.getOutputStream();
      socketOut.write(responseFirstLine.getBytes());
      socketOut.write(responseHeader.getBytes());
      
      int len=0;
      buffer=new byte[128];
      while((len=in.read(buffer))!=-1)   socketOut.write(buffer,0,len);
      
      
      Thread.sleep(1000);
      socket.close();
      
  } 
}

步骤1：保存为 HttpServer.java

注意：图片中h是小写，代码文件名是大写HttpServer

步骤2：进入保存路径

步骤3：

javac httpServer.java

步骤4：

步骤5：

步骤6：

建议firefox打开，别的浏览器不太好用