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| package com.techscore.sandbox; | |
| import java.io.IOException; | |
| import java.io.InputStream; | |
| import java.net.URL; | |
| import java.nio.ByteBuffer; | |
| import java.util.ArrayList; | |
| import java.util.List; | |
| import java.util.regex.Pattern; | |
| import javax.servlet.ServletException; | |
| import javax.servlet.annotation.WebServlet; | |
| import javax.servlet.http.HttpServlet; | |
| import javax.servlet.http.HttpServletRequest; | |
| import javax.servlet.http.HttpServletResponse; | |
| public class Servlets { | |
| @WebServlet(name = "Index", urlPatterns = { "/" }) | |
| public static class Index extends HttpServlet { | |
| @Override | |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { | |
| resp.getWriter().print("<html><body><h1>Sandbox!</h1>" + "<a href=\"/NetworkIO\">NetworkIO</a><br>" | |
| + "<a href=\"/DeadLock\">DeadLock</a><br>" + "<a href=\"/Regex\">Regex</a><br>"); | |
| } | |
| } | |
| @WebServlet(name = "Sleep", urlPatterns = { "/Sleep" }) | |
| public static class Sleep extends HttpServlet { | |
| @Override | |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { | |
| try { | |
| Thread.sleep(10000); | |
| } catch (InterruptedException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| } | |
| @WebServlet(name = "NetworkIO", urlPatterns = { "/NetworkIO" }) | |
| public static class NetworkIO extends HttpServlet { | |
| @Override | |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { | |
| URL url = new URL("http://localhost:8080/Sleep"); | |
| InputStream is = url.openConnection().getInputStream(); | |
| } | |
| } | |
| @WebServlet(name = "DeadLock", urlPatterns = { "/DeadLock" }) | |
| public static class DeadLock extends HttpServlet { | |
| @Override | |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { | |
| Object obj1 = new Object(); | |
| Object obj2 = new Object(); | |
| new Thread(() -> { | |
| synchronized (obj1) { | |
| sleep(500); | |
| synchronized (obj2) { | |
| } | |
| } | |
| }).start(); | |
| new Thread(() -> { | |
| synchronized (obj2) { | |
| sleep(500); | |
| synchronized (obj1) { | |
| } | |
| } | |
| }).start(); | |
| } | |
| private void sleep(long millis) { | |
| try { | |
| Thread.sleep(millis); | |
| } catch (Exception e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| } | |
| @WebServlet(name = "Regex", urlPatterns = { "/Regex" }) | |
| public static class Regex extends HttpServlet { | |
| @Override | |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { | |
| for (int i = 0; i < 50000000; i++) { | |
| "hogehoge".replaceAll("hoge", "fuga"); | |
| } | |
| resp.getWriter().println("Done!"); | |
| } | |
| } | |
| } |
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