#22 mvc: dispatcher servlet

my-framework/mvc-practice/.gitignore

@@ -0,0 +1 @@
+tomcat.8080/**

my-framework/mvc-practice/build.gradle

@@ -10,7 +10,12 @@ repositories {
 }
 
 dependencies {
+    implementation 'org.apache.tomcat.embed:tomcat-embed-core:9.0.58'
+    implementation 'org.apache.tomcat.embed:tomcat-embed-jasper:9.0.58'
+
     implementation 'javax.servlet:javax.servlet-api:4.0.1'
+    implementation 'javax.servlet:jstl:1.2'
+
     implementation 'org.reflections:reflections:0.10.2'
     implementation 'ch.qos.logback:logback-classic:1.2.11'
 

my-framework/mvc-practice/src/main/java/org/example/WebApplicationServer.java

@@ -0,0 +1,37 @@
+package org.example;
+
+import org.apache.catalina.Context;
+import org.apache.catalina.LifecycleException;
+import org.apache.catalina.WebResourceRoot;
+import org.apache.catalina.startup.Tomcat;
+import org.apache.catalina.webresources.DirResourceSet;
+import org.apache.catalina.webresources.StandardRoot;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+
+public class WebApplicationServer {
+
+    private static final Logger log = LoggerFactory.getLogger(WebApplicationServer.class);
+    public static void main(String[] args) throws LifecycleException {
+        String webappDirLocation = "webapp/";
+        Tomcat tomcat = new Tomcat();
+        tomcat.setPort(8080);
+        tomcat.getConnector();
+
+        Context ctx = tomcat.addWebapp("/", new File(webappDirLocation).getAbsolutePath());
+        log.info("configuring app with basedir: {}", new File("./" + webappDirLocation).getAbsolutePath());
+
+        File additionWebInfClasses = new File("build/classes");
+        WebResourceRoot resources = new StandardRoot(ctx);
+        resources.addPreResources(new DirResourceSet(resources, "/WEB-INF/classes",
+                additionWebInfClasses.getAbsolutePath(), "/"));
+
+        ctx.setResources(resources);
+
+        tomcat.start();
+        tomcat.getServer().await();
+
+    }
+}

my-framework/mvc-practice/src/main/java/org/example/mvc/DispatcherServlet.java

@@ -0,0 +1,32 @@
+package org.example.mvc;
+
+import org.example.mvc.controller.Controller;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+@WebServlet("/")
+public class DispatcherServlet extends HttpServlet {
+
+    private static final Logger log = LoggerFactory.getLogger(DispatcherServlet.class);
+
+    private RequestMappingHandlerMapping requestMappingHandlerMapping;
+
+    @Override
+    public void init() throws ServletException {
+        requestMappingHandlerMapping = new RequestMappingHandlerMapping();
+        requestMappingHandlerMapping.init();
+    }
+
+    @Override
+    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        log.info("[DispatcherServlet] service started.");
+    }
+}

my-framework/mvc-practice/src/main/resources/logback.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE configuration>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <layout class="ch.qos.logback.classic.PatternLayout">
+            <Pattern>%d{HH:mm:ss.SSS} [%-5level] [%thread] [%logger{36}] - %m%n</Pattern>
+        </layout>
+    </appender>
+
+    <logger name="org.example" level="DEBUG"/>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT"/>
+    </root>
+</configuration>