动手实现自己的http服务器【精简版】

package v2;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.List;
import java.util.Scanner;

public class Test
{
  public static void main(String[] args)
  {
    try
    {
      Socket s = null;
      ServerSocket ss = new ServerSocket(80);
      while ((s = ss.accept()) != null)
      {
        Scanner input = new Scanner(s.getInputStream(), "utf-8");
        int c = 0;
        String tmp = null;
        while (input.hasNextLine())
        {
          tmp = input.nextLine();
          if (tmp.trim().length() == 0) {
            break;
          }
          System.out.println(c + "·····································" + tmp);
          c++;
        }
        System.out.println("开始响应·····························");
        responseMsg(s, "Hello,world");
        input.close();
        s.close();
      }
    }
    catch (IOException e)
    {
      e.printStackTrace();
    }
  }
  
  private static void responseMsg(Socket s, String msg)
  {
    try
    {
      OutputStream out = s.getOutputStream();
      PrintWriter pw = new PrintWriter(out);
      
      pw.print("HTTP/1.0 500 OK\r\n");
      pw.print("Content-type:text/html; charset=utf-8\r\n");
      pw.print("\r\n");
      
      pw.println(msg);
      pw.flush();
      pw.close();
    }
    catch (IOException e)
    {
      e.printStackTrace();
    }
  }
  
  public static void showLines(List<String> lines)
  {
    for (String line : lines) {
      System.out.println(line);
    }
  }
}

如果端口被占用了，windows系统可以cmd输入"netstat -ano|find "80"     找到相关进程的id，然后  "taskkill  /f /pid 进程id  "进行查杀