java 实现简单的http服务器

1、废话不多说，代码如下

package com.linhuaming.test;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * http服务器 测试
 */
public class HttpServerTest {

    public static void main(String[] args) throws IOException {
        // ServerSocket指定端口port
        ServerSocket serverSocket = new ServerSocket(8080);
        System.out.println("启动服务---port:8080");

        while(true){
            // 阻塞到有连接访问，拿到socket
            Socket socket = serverSocket.accept();
            System.out.println("get socket from:"+socket.hashCode());

            // STEP. 启动线程
            new Thread(()->{
                try {
                    // STEP. 获取输入流、输出流
                    OutputStream outputStream = null;
                    InputStream inputStream = null;
                    inputStream = socket.getInputStream();
                    outputStream = socket.getOutputStream();

                    // STEP. 获取输入内容
                    byte[] bytes = new byte[inputStream.available()];
                    int result = inputStream.read(bytes);
                    if (result != -1) {
                        System.out.println(new String(bytes));
                    }

                    // STEP. 响应内容
                    // http 状态
                    String httpStatus = "200 OK";
                    // String httpStatus = "404 Not Found";
                    // String httpStatus = "500 Internal Server Error";

                    // 状态行、响应头部、空行、响应信息
                    String body = "<h1>hello</h1>";
                    String responseStatusLine = "HTTP/1.1 "+httpStatus+"\r\n";
                    String responseHeader = "";
                    responseHeader += "Content-Length: " + body.getBytes().length + "\r\n";
                    responseHeader += "Content-Type: text/html; charset-utf-8\r\n";
                    String responseLine = "\r\n";
                    String responseBody = body + "\r\n";
                    String response = responseStatusLine + responseHeader +responseLine + responseBody;

                    // 输出响应内容、关闭流
                    outputStream.write(response.getBytes());//按照协议，将返回请求由outputStream写入
                    outputStream.flush();
                    socket.shutdownInput();
                    socket.shutdownOutput();
                    socket.close();
                }catch (Exception e){
                    e.printStackTrace();
                }

            },String.valueOf(socket.hashCode())).start();
        }
    }

}

2、打开postman、chrome浏览器都可以，访问http://127.0.0.1:8080/test 即可，如下图所示

postman 访问

chrome 访问