package cn.how2j.javaweb;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response){
        try {
            response.getWriter().println("Hello DIY Tomcat from HelloServlet@javaweb " + this);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

    public synchronized HttpServlet  getServlet(Class<?> clazz)
            throws InstantiationException, IllegalAccessException, ServletException {
        HttpServlet servlet = servletPool.get(clazz);
        if (null == servlet) {
            servlet = (HttpServlet) clazz.newInstance();
            servletPool.put(clazz, servlet);
        }
        return servlet;
    }

package cn.how2j.diytomcat.servlets;

import cn.how2j.diytomcat.catalina.Context;
import cn.how2j.diytomcat.http.Request;
import cn.how2j.diytomcat.http.Response;
import cn.how2j.diytomcat.util.Constant;
import cn.hutool.core.util.ReflectUtil;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class InvokerServlet extends HttpServlet {
	private static InvokerServlet instance = new InvokerServlet();

	public static synchronized InvokerServlet getInstance() {
		return instance;
	}

	private InvokerServlet() {

	}

	public void service(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse)
			throws IOException, ServletException {
			Request request = (Request) httpServletRequest;
			Response response = (Response) httpServletResponse;

			String uri = request.getUri();
			Context context = request.getContext();
			String servletClassName = context.getServletClassName(uri);

			try {
				Class servletClass = context.getWebappClassLoader().loadClass(servletClassName);
				Object servletObject = context.getServlet(servletClass);
				ReflectUtil.invoke(servletObject, "service", request, response);
				response.setStatus(Constant.CODE_200);

			} catch (Exception e) {
				throw new RuntimeException(e);
			}

	}

}

package cn.how2j.diytomcat.test;

import cn.how2j.diytomcat.util.MiniBrowser;
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.date.TimeInterval;
import cn.hutool.core.util.NetUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.core.util.ZipUtil;
import cn.hutool.http.HttpUtil;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import sun.net.www.content.text.plain;

import java.io.ByteArrayOutputStream;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class TestTomcat {
    private static int port = 18080;
    private static String ip = "127.0.0.1";
    @BeforeClass
    public static void beforeClass() {
        //所有测试开始前看diy tomcat 是否已经启动了
        if(NetUtil.isUsableLocalPort(port)) {
            System.err.println("请先启动 位于端口: " +port+ " 的diy tomcat，否则无法进行单元测试");
            System.exit(1);
        }
        else {
            System.out.println("检测到 diy tomcat已经启动，开始进行单元测试");
        }
    }

    @Test
    public void testHelloTomcat() {
        String html = getContentString("/");
        Assert.assertEquals(html,"Hello DIY Tomcat from how2j.cn");
    }

    @Test
    public void testTimeConsumeHtml() throws InterruptedException {
        ThreadPoolExecutor threadPool = new ThreadPoolExecutor(20, 20, 60, TimeUnit.SECONDS,
                new LinkedBlockingQueue<Runnable>(10));
            TimeInterval timeInterval = DateUtil.timer();

        for(int i = 0; i<3; i++){
            threadPool.execute(new Runnable(){
                public void run() {
                    getContentString("/timeConsume.html");
                }
            });
        }
        threadPool.shutdown();
        threadPool.awaitTermination(1, TimeUnit.HOURS);

        long duration = timeInterval.intervalMs();

        Assert.assertTrue(duration < 3000);
    }

    @Test
    public void testaIndex() {
        String html = getContentString("/a");
        Assert.assertEquals(html,"Hello DIY Tomcat from index.html@a");
    }

    @Test
    public void testbIndex() {
        String html = getContentString("/b/");
        Assert.assertEquals(html,"Hello DIY Tomcat from index.html@b");
    }

    @Test
    public void test404() {
        String response  = getHttpString("/not_exist.html");
        containAssert(response, "HTTP/1.1 404 Not Found");
    }
    @Test
    public void test500() {
        String response  = getHttpString("/500.html");
        containAssert(response, "HTTP/1.1 500 Internal Server Error");
    }

    @Test
    public void testaTxt() {
        String response  = getHttpString("/a.txt");
        containAssert(response, "Content-Type: text/plain");
    }

    @Test
    public void testPNG() {
        byte[] bytes = getContentBytes("/logo.png");
        int pngFileLength = 1672;
        Assert.assertEquals(pngFileLength, bytes.length);
    }
    @Test
    public void testPDF() {
        byte[] bytes = getContentBytes("/etf.pdf");
        int pngFileLength = 3590775;
        Assert.assertEquals(pngFileLength, bytes.length);
    }

    @Test
    public void testhello() {
        String html = getContentString("/j2ee/hello");
        Assert.assertEquals(html,"Hello DIY Tomcat from HelloServlet");
    }

    @Test
    public void testJavawebHello() {
        String html = getContentString("/javaweb/hello");
        containAssert(html,"Hello DIY Tomcat from HelloServlet@javaweb");
    }

    @Test
    public void testJavawebHelloSingleton() {
        String html1 = getContentString("/javaweb/hello");
        String html2 = getContentString("/javaweb/hello");
        Assert.assertEquals(html1,html2);
    }

    private byte[] getContentBytes(String uri) {
        return getContentBytes(uri,false);
    }
    private byte[] getContentBytes(String uri,boolean gzip) {
        String url = StrUtil.format("http://{}:{}{}", ip,port,uri);
        return MiniBrowser.getContentBytes(url,false);
    }
    private String getContentString(String uri) {
        String url = StrUtil.format("http://{}:{}{}", ip,port,uri);
        String content = MiniBrowser.getContentString(url);
        return content;
    }
    private String getHttpString(String uri) {
        String url = StrUtil.format("http://{}:{}{}", ip,port,uri);
        String http = MiniBrowser.getHttpString(url);
        return http;
    }
    private void containAssert(String html, String string) {
        boolean match = StrUtil.containsAny(html, string);
        Assert.assertTrue(match);
    }
}