Vishwanth: Merged my changes of Thymeleaf POC (Proof of Concept)

spring-mvc-java/src/main/java/org/baeldung/controller/UserController.java

@@ -0,0 +1,31 @@
+package org.baeldung.controller;
+
+import org.baeldung.model.UserDetails;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+@Controller
+@RequestMapping("/")
+public class UserController {
+
+    @RequestMapping(value = "/", method = RequestMethod.GET)
+    public String showForm(final Model model) {
+        final UserDetails user = new UserDetails();
+        user.setFirstname("John");
+        user.setLastname("Roy");
+        user.setEmailId("John.Roy@gmail.com");
+        model.addAttribute("user", user);
+        return "index";
+    }
+
+    @RequestMapping(value = "/processForm", method = RequestMethod.POST)
+    public String processForm(@ModelAttribute(value = "user") final UserDetails user, final Model model) {
+        // Insert userDetails into DB
+        model.addAttribute("name", user.getFirstname() + " " + user.getLastname());
+        return "hello";
+    }
+
+}

spring-mvc-java/src/main/java/org/baeldung/dialect/CustomDialect.java

@@ -0,0 +1,24 @@
+package org.baeldung.dialect;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.baeldung.processor.NameProcessor;
+import org.thymeleaf.dialect.AbstractDialect;
+import org.thymeleaf.processor.IProcessor;
+
+public class CustomDialect extends AbstractDialect {
+
+    @Override
+    public String getPrefix() {
+        return "custom";
+    }
+
+    @Override
+    public Set<IProcessor> getProcessors() {
+        final Set<IProcessor> processors = new HashSet<IProcessor>();
+        processors.add(new NameProcessor());
+        return processors;
+    }
+
+}

spring-mvc-java/src/main/java/org/baeldung/model/UserDetails.java

@@ -0,0 +1,32 @@
+package org.baeldung.model;
+
+public class UserDetails {
+    private String firstname;
+    private String lastname;
+    private String emailId;
+
+    public String getFirstname() {
+        return firstname;
+    }
+
+    public void setFirstname(final String firstname) {
+        this.firstname = firstname;
+    }
+
+    public String getLastname() {
+        return lastname;
+    }
+
+    public void setLastname(final String lastname) {
+        this.lastname = lastname;
+    }
+
+    public String getEmailId() {
+        return emailId;
+    }
+
+    public void setEmailId(final String emailId) {
+        this.emailId = emailId;
+    }
+
+}

spring-mvc-java/src/main/java/org/baeldung/processor/NameProcessor.java

@@ -0,0 +1,23 @@
+package org.baeldung.processor;
+
+import org.thymeleaf.Arguments;
+import org.thymeleaf.dom.Element;
+import org.thymeleaf.processor.attr.AbstractTextChildModifierAttrProcessor;
+
+public class NameProcessor extends AbstractTextChildModifierAttrProcessor {
+
+    public NameProcessor() {
+        super("name");
+    }
+
+    @Override
+    protected String getText(final Arguments arguements, final Element elements, final String attributeName) {
+        return "Hello, " + elements.getAttributeValue(attributeName) + "!";
+    }
+
+    @Override
+    public int getPrecedence() {
+        return 1000;
+    }
+
+}

spring-mvc-java/src/main/java/org/baeldung/spring/web/config/ClientWebConfig.java

@@ -1,16 +1,28 @@
 package org.baeldung.spring.web.config;
 
+import java.util.HashSet;
+import java.util.Set;
+
+import org.baeldung.dialect.CustomDialect;
+import org.springframework.context.MessageSource;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Description;
+import org.springframework.context.support.ResourceBundleMessageSource;
 import org.springframework.web.servlet.ViewResolver;
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
 import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
-import org.springframework.web.servlet.view.InternalResourceViewResolver;
-import org.springframework.web.servlet.view.JstlView;
+import org.thymeleaf.dialect.IDialect;
+import org.thymeleaf.spring4.SpringTemplateEngine;
+import org.thymeleaf.spring4.view.ThymeleafViewResolver;
+import org.thymeleaf.templateresolver.ServletContextTemplateResolver;
 
 @EnableWebMvc
 @Configuration
+@ComponentScan("org.baeldung.controller")
 public class ClientWebConfig extends WebMvcConfigurerAdapter {
 
     public ClientWebConfig() {
@@ -28,12 +40,49 @@ public class ClientWebConfig extends WebMvcConfigurerAdapter {
 
     @Bean
     public ViewResolver viewResolver() {
-        final InternalResourceViewResolver bean = new InternalResourceViewResolver();
-
+        /*final InternalResourceViewResolver bean = new InternalResourceViewResolver();
         bean.setViewClass(JstlView.class);
         bean.setPrefix("/WEB-INF/view/");
-        bean.setSuffix(".jsp");
+        bean.setSuffix(".jsp");*/
 
-        return bean;
+        final ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
+        viewResolver.setTemplateEngine(templateEngine());
+
+        return viewResolver;
     }
+
+    @Bean
+    @Description("Thymeleaf template resolver serving HTML 5")
+    public ServletContextTemplateResolver templateResolver() {
+        final ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver();
+        templateResolver.setPrefix("/WEB-INF/templates/");
+        templateResolver.setSuffix(".html");
+        templateResolver.setTemplateMode("HTML5");
+        return templateResolver;
+    }
+
+    @Bean
+    @Description("Thymeleaf template engine with Spring integration")
+    public SpringTemplateEngine templateEngine() {
+        final SpringTemplateEngine templateEngine = new SpringTemplateEngine();
+        templateEngine.setTemplateResolver(templateResolver());
+        final Set<IDialect> dialects = new HashSet<>();
+        dialects.add(new CustomDialect());
+        templateEngine.setAdditionalDialects(dialects);
+        return templateEngine;
+    }
+
+    @Bean
+    @Description("Spring message resolver")
+    public MessageSource messageSource() {
+        final ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
+        messageSource.setBasename("messages");
+        return messageSource;
+    }
+
+    @Override
+    public void addResourceHandlers(final ResourceHandlerRegistry registry) {
+        registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
+    }
+
 }