Added a Spring Boot + Thymeleaf based form validation sample application code

4 files changed, 106 insertions, 0 deletions

diff --git a/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/Application.java b/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/Application.java
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+++ b/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/Application.java
@@ -0,0 +1,12 @@
+package com.example.spring;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) throws Exception {
+		SpringApplication.run(Application.class, args);
+	}
+}
\ No newline at end of file
diff --git a/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/HomeController.java b/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/HomeController.java
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+++ b/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/HomeController.java
@@ -0,0 +1,13 @@
+package com.example.spring;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+public class HomeController {
+
+    @RequestMapping("/")
+	public String home() {
+		return "index";
+	}
+}
diff --git a/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/contact/ContactController.java b/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/contact/ContactController.java
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+++ b/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/contact/ContactController.java
@@ -0,0 +1,36 @@
+package com.example.spring.contact;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PostMapping;
+
+import jakarta.validation.Valid;
+
+@Controller
+public class ContactController {
+
+	@GetMapping("/contact")
+	public String showForm(Model model) {
+		model.addAttribute("contactForm", new ContactForm());
+		return "contact/form";
+	}
+
+	@PostMapping("/contact")
+	public String processSubmission(@Valid @ModelAttribute ContactForm contactForm, BindingResult bindingResult,
+			Model model) {
+		if (bindingResult.hasErrors()) {
+			return "contact/form";
+		}
+
+		// Do whatever needed with the submitted data here.
+		// For example, invoke a method in a service/componet bean to send an email to contact person.
+
+		model.addAttribute("contactForm", contactForm);
+
+		return "contact/result";
+	}
+
+}
diff --git a/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/contact/ContactForm.java b/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/contact/ContactForm.java
new file mode 100644
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--- /dev/null
+++ b/spring-boot/06-form-handling-with-thymeleaf/src/main/java/com/example/spring/contact/ContactForm.java
@@ -0,0 +1,45 @@
+package com.example.spring.contact;
+
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+
+public class ContactForm {
+
+	@Pattern(regexp = "^[ a-zA-Z]+$", message = "Name should only include English letters")
+	@NotBlank(message = "Name is required")
+	private String name;
+
+	@Email(message = "Must be a valid email")
+    @NotBlank(message = "Email is required")
+	private String email;
+
+	@Size(min = 10, message = "Message must be at least 10 characters long")
+	private String message;
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getEmail() {
+		return email;
+	}
+
+	public void setEmail(String email) {
+		this.email = email;
+	}
+
+	public String getMessage() {
+		return message;
+	}
+
+	public void setMessage(String message) {
+		this.message = message;
+	}
+
+}