http://127.0.0.1:8000/webserver/web/index.html

项目名：webserver
资源名目录： /web

返回hello

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package web.server;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class TCPServer {
    public static void main(String[] args) throws IOException {
        ServerSocket server = new ServerSocket(8000);
        //获取客户端的socket
        Socket accept = server.accept();

        InputStream clientIS = accept.getInputStream();

        clientIS.read();//必须得对客户端socket任意操作一波，不然没办法返回内容


        OutputStream outputStream = accept.getOutputStream();
        outputStream.write("HTTP/1.1 200 OK\r\n".getBytes());
        outputStream.write("Content-Type:text/html\r\n".getBytes());
        //写入空行，否则浏览器不解析
        outputStream.write("\r\n".getBytes());
        outputStream.write("hello".getBytes());
        accept.close();
        server.close();

    }
}

返回html

浏览器解析服务器回写的html页面中，如果有图片，那么浏览器会单独开一个线程，读取服务器的图片
所以必须使服务无线循环  不能单次服务

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package file.upload;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

//server
public class FileUploadServer {
    public static void main(String[] args) throws IOException {
        ServerSocket server = new ServerSocket(8000);
       while(true){
           Socket accept = server.accept();
           new Thread(new Runnable() {
               @Override
               public void run() {
                   try{
                       InputStream inputStream = accept.getInputStream();
                       //判断upload文件夹是否存在
                       File file = new File("D:\\upload");
                       if(!file.exists()){
                           file.mkdirs();
                       }
                       FileOutputStream fileOutputStream = new FileOutputStream(file +"\\"+System.currentTimeMillis()+".gif");
                       int len = 0;
                       byte[] bytes = new byte[1024 * 10];
                       while ((len = inputStream.read(bytes)) != -1) {
                           //写入本地
                           fileOutputStream.write(bytes, 0, len);
                       }

                       accept.getOutputStream().write("接收完毕".getBytes());
                       fileOutputStream.close();

                   }catch (IOException e){
                       e.printStackTrace();
                   }finally {
                       try {
                           accept.close();
                       }catch (IOException e){
                           e.printStackTrace();
                       }
                   }

               }
           });

       }
//        server.close();
    }
}