Tìm hiểu về spring core - Bài 5: Spring webmvc

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>vn.techmaster</groupId>
        <artifactId>mastering-spring-boot</artifactId>
        <version>1.0.0</version>
    </parent>

    <groupId>vn.techmaster</groupId>
    <artifactId>webmvc</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <version>${tomcat.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jasper</artifactId>
            <version>${tomcat.version}</version>
        </dependency>
    </dependencies>
</project>

public abstract class HttpServlet extends GenericServlet {

    @Override
    public void init(ServletConfig config) throws ServletException {
    }

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    }

    protected void doHead(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    }

    protected void doPatch(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    }

    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    }

    protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {    }

    protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    }
}

package vn.techmaster.webmvc.config;

import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletRegistration;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class WebAppInitializer implements WebApplicationInitializer {

    @Override
    public void onStartup(ServletContext servletContext) {
        AnnotationConfigWebApplicationContext context =
            new AnnotationConfigWebApplicationContext();
        context.setConfigLocation("vn.techmaster.webmvc");
        ServletRegistration.Dynamic dispatcher = servletContext
            .addServlet("dispatcher", new DispatcherServlet(context));
        dispatcher.setLoadOnStartup(1);
        dispatcher.addMapping("/");
    }
}

@HandlesTypes(WebApplicationInitializer.class)
public class SpringServletContainerInitializer implements ServletContainerInitializer {

package vn.techmaster.webmvc.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "vn.techmaster.webmvc")
public class WebConfig {

    @Bean
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setPrefix("/templates/");
        viewResolver.setSuffix(".jsp");
        return viewResolver;
    }
}

package vn.techmaster.webmvc.controller;

import lombok.AllArgsConstructor;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import vn.techmaster.webmvc.model.MessageService;

@Controller
@RequestMapping("/")
@AllArgsConstructor
public class HomeController {

    private final MessageService messageService;

    @GetMapping
    public ModelAndView home() {
        String message = messageService.getMessage();
        ModelAndView modelAndView = new ModelAndView("home");
        modelAndView.addObject("message", message);
        return modelAndView;
    }
}

<!DOCTYPE html>
<html>
<head>
    <title>Home</title>
</head>
<body>
    <h1>${message}</h1>
</body>
</html>

package vn.techmaster.webmvc.model;

import org.springframework.stereotype.Component;

@Component
public class MessageService {

    public String getMessage() {
        return "Welcome to Techmaster";
    }
}

package vn.techmaster.webmvc;

import org.apache.catalina.connector.Connector;
import org.apache.catalina.startup.Tomcat;

import java.io.File;

public class WebMvcStartUp {

    public static void main(String[] args) throws Exception {
        String webappDirLocation = "src/main/resources/";
        Tomcat tomcat = new Tomcat();
        Connector connector = new Connector();
        connector.setPort(8080);
        tomcat.setConnector(connector);
        tomcat.addWebapp(
            "/",
            new File(webappDirLocation).getAbsolutePath()
        );
        tomcat.start();
        System.out.println("server started");
        tomcat.getServer().await();
    }
}