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自定义Tomcat

MyRequest请求类

package com.hailu;

import java.io.IOException;
import java.io.InputStream;

public class MyRequest {
    //请求方法
    private String requestMethod;
    //请求地址
    private String requestUrl;

    public MyRequest(InputStream inputStream) throws IOException {
        //缓冲区域
        byte[] buffer = new byte[1024];
        //读取数据长度
        int len = 0;
        //定义请求变量
        String str = null;
        if ((len = inputStream.read(buffer)) > 0) {
            str = new String(buffer, 0, len);
        }
        //GET / HTTP/1.1
        String data = str.split("
")[0];
        String[] params = data.split(" ");
        this.requestMethod = params[0];
        this.requestUrl = params[1];
    }

    public String getRequestMethod() {
        return requestMethod;
    }

    public void setRequestMethod(String requestMethod) {
        this.requestMethod = requestMethod;
    }

    public String getRequestUrl() {
        return requestUrl;
    }

    public void setRequestUrl(String requestUrl) {
        this.requestUrl = requestUrl;
    }
}

MyResponse响应类

package com.hailu;

import java.io.OutputStream;

public class MyResponse {
    private OutputStream outputStream;

    public MyResponse(OutputStream outputStream){
        this.outputStream=outputStream;
    }

    public void write(String string) throws  Exception{
        StringBuilder stringBuilder=new StringBuilder();
        stringBuilder.append("HTTP/1.1 200 OK
")
                .append("Content-Type:text/html
")
                .append("
")
                .append("<html><body><h1>")
                .append(string)
                .append("</h1></body></html>");
        this.outputStream.write(stringBuilder.toString().getBytes());
        this.outputStream.flush();
        this.outputStream.close();
    }
}

MyMapping用于映射哪个Servlet处理我们的请求

package com.hailu;

import java.util.HashMap;

public class MyMapping {
    public static HashMap<String,String> mapping=new HashMap<>();
    static {
        mapping.put("/mytomcat","com.hailu.MyServlet");
    }
    public HashMap<String,String> getMapping(){
        return mapping;
    }
}

MyHttpServlet抽象类

package com.hailu;

public abstract class MyHttpServlet {
    public static final String METHOD_GET = "GET";
    public static final String METHOD_POST = "POST";

    public abstract void doGet(MyRequest myRequest, MyResponse myResponse) throws Exception;

    public abstract void doPost(MyRequest myRequest, MyResponse myResponse)throws Exception;

    /**
     * 根据请求方式来判断用哪种处理方法
     * @param myRequest
     * @param myResponse
     * @throws Exception
     */
    public void service(MyRequest myRequest, MyResponse myResponse)throws Exception {
        if (METHOD_GET.equals(myRequest.getRequestMethod())){
            doGet(myRequest,myResponse);
        }else if (METHOD_POST.equals(myRequest.getRequestMethod())){
            doPost(myRequest,myResponse);
        }
    }
}

MyHttpServlet

package com.hailu;

public class MyServlet extends MyHttpServlet {
    @Override
    public void doGet(MyRequest myRequest, MyResponse myResponse) throws Exception {
        myResponse.write("GetMyTomcat");
    }

    @Override
    public void doPost(MyRequest myRequest, MyResponse myResponse)throws Exception {
        myResponse.write("PostMyTomcat");
    }
}

MyServer

package com.hailu;

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

public class MyServer {
    public static void startServer(int port) throws Exception {
        ServerSocket serverSocket = new ServerSocket(port);
        Socket socket = null;
        while (true) {
            socket = serverSocket.accept();
            MyRequest myRequest = new MyRequest(socket.getInputStream());
            MyResponse myResponse = new MyResponse(socket.getOutputStream());

            String clazz = new MyMapping().getMapping().get(myRequest.getRequestUrl());
            if (clazz != null) {
                Class<MyServlet> myServletClass = (Class<MyServlet>) Class.forName(clazz);
                MyServlet myServlet = myServletClass.newInstance();
                myServlet.service(myRequest, myResponse);
            }
        }
    }

    public static void main(String[] args) {
        try {
            startServer(10086);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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原文地址：https://www.cnblogs.com/yanghailu/p/12741155.html