Java web服务器webServer

package com;

import java.net.ServerSocket;
import java.net.Socket;
 
 
public class WebServer {
	public static void main(String[] args) {
		int Port = 8081;//端口号，由于这里是测试，所以不要使用常用端口
		//创建两个套接字
		ServerSocket server = null;
		Socket client = null;
		try{
			server = new ServerSocket(Port);
			//服务器开始监听
			System.out.println("The WebServer is listening on port "+server.getLocalPort());
			while(true){
				client = server.accept();
//				//多线程运行
				new CommunicateThread(client).start();
			}
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
	}

}```




```java
package com;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;


//每有一个连接建立时，服务器分出一个通信的线程
public class CommunicateThread extends Thread {
    //与客户端通信的套接字
    Socket client;

    public CommunicateThread(Socket s) {
        client = s;
    }

    //获取浏览器请求资源的路径
    public String getResourcePath(String s) {
        // 一般的HTTP请求报文的第一行是“GET /index.html HTTP/1.1”
        // 我们要获取的就是中间的"/indext.apsx"

        //获取资源的位置
        String s1 = s.substring(s.indexOf(' ') + 1);
        s1 = s1.substring(1, s1.indexOf(' '));

        //默认资源为index.html
        if (s1.equals(""))
            s1 = "index.html";

        return s1;
    }

    public void sendFile(PrintStream out, File file) {
        try {
            DataInputStream in = new DataInputStream(new FileInputStream(file));
            int len = (int) file.length();
            byte buf[] = new byte[len];
            in.readFully(buf);//读取文内容到buf数组中
            out.write(buf, 0, len);

            out.flush();
            in.close();
        } catch (Exception e) {
            System.out.println(e.getMessage());
            System.exit(1);
        }
    }

    public void run() {
        try {
            //获取用户的IP地址和端口号
            String clientIP = client.getInetAddress().toString();
            int clientPort = client.getPort();
            //创建输出流对象
            PrintStream out = new PrintStream(client.getOutputStream());
            //创建输入流对象
            DataInputStream in = new DataInputStream(client.getInputStream());
            //读取浏览器提交的请求
            String msg = in.readLine();

            //获取文件路径
            String fileName = getResourcePath(msg);
//            System.out.println("The user asked for resource: " + fileName);
            File file = new File(fileName);

            if (file.exists()) {
                //根据响应报文格式设置
                System.out.println(fileName + " start send");
                out.println("HTTP/1.0 200 OK");
                out.println("MIME_version:1.0");
                out.println("Content_Type:text/html");
                int len = (int) file.length();
                out.println("Content_Length:" + len);
                out.println("");//报文头和信息之间要空一行

                //发送文件
                sendFile(out, file);
                out.flush();
            }
            else {
                StringBuffer error2 = new StringBuffer();
                error2.append("HTTP/1.1 404 file not found \r\n");
                error2.append("Content-Type:text/html \r\n");
                error2.append("Content-Length:20 \r\n").append("\r\n");
                error2.append("
404 no find
");
                try {
                    out.write(error2.toString().getBytes());
                    out.flush();
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
            client.close();
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }


}