JAVA 模拟TomCat服务器

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一、模拟TomCat服务器

public class HttpServer{
    //  服务器返回数据必要的数据头
    private static String head = "HTTP/1.1 200 OK"
                                +"Connection: close"
                                +"\n\n";
    public static void main(String[] args)throws IOExecption{
        System.out.println("服务器启动");
        //  端口: 80为默认端口,请求时可以省略不写
        ServerSocket socket = new ServerSocket(8081);
        //  等待浏览器请求
        Socket brower = socket.accept();
        //  一次性读取浏览器请求发来的请求头,避免阻塞
        InputStream receiver = brower.getInputStream();
        byte[] buf = new byte[1024];
        int len = receiver.read(buf);
        System.out.println(new String(buf,0,len));
        //  如何给浏览器返回信息
        OutputStream sender = brower.getOutputStream();
        //  html  功能: 通过浏览器请求的路径,解析具体路径下的文件,转换成html的字符串
        String html = "<font color = 'red' size='80'>Request Success</font>";
        String msg = head+html;
        sender.write(msg.getBytes());
        //  服务关闭
        brower.close();
        socket.close();
    }
}

浏览器发来的信息
连接状态 (注: 和HTTP协议相关)
Connection: keep-alive
用户代理
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36
请求次数
Upgrade-Insecure-Requests: 1
支持的格式
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,/;q=0.8
浏览器支持的压缩方式
Accept-Encoding: gzip, deflate, br
支持的语言
Accept-Language: zh-CN,zh;q=0.9
结束标记
\n\n

二、模拟客户端浏览器

public class HttpClient{
    private static String head = "GET /Test/index.html HTTP/1.1\n"
                                +"Host: localhost:8080\n"
                                +"Connection: close\n"
                                +"\n";
    public static void main(String[] args) throws UnknownHostException, IOEXception{
        System.out.println("Brower request message...");
        Socket brower = new Socket("localhost",8080);
        PrintWriter sender = new PrintWriter(brower.getOutputStream(),true);
        // 模拟浏览器发送请求头信息
        sender.println(head);
        // 接收tomcat返回的信息
        BufferedReader receiver = new BufferedReader(new InputStreamReader(brower.getInputStream()));
        String line = null;
        while((line = receiver.readLine())!=null){
            System.out.println(line);
        }
        brower.close();
    }
}

HTTP 协议版本 : 状态码
HTTP/1.1 200 OK
服务的提供
Server: Apache-Coyote/1.1
支持的范围
Accept-Ranges: bytes
标记(token)
ETag: W/”304-1516331676000”
最后的修改时间
Last-Modified: Fri, 19 Jan 2018 03:14:36 GMT
返回的文本格式
Content-Type: text/html
返回的内容文本长度
Content-Length: 304
返回的时间
Date: Fri, 19 Jan 2018 06:39:47 GMT
连接方式
Connection: close
结束标识
\n