BAEL-2299 - A CRUD web application with SpringBoot and Thymeleaf (#5530)

* Initial Commit

* Update Application.java

* Update pom.xml

* Update pom.xml

* Update pom.xml

* Update Application.java

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/springbootcrudapp/application/Application.java

@@ -0,0 +1,22 @@
+package com.baeldung.springbootcrudapp.application;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.domain.EntityScan;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+@SpringBootApplication 
+@EnableAutoConfiguration
+@ComponentScan(basePackages={"com.baeldung.springbootcrudapp.application"})
+@EnableJpaRepositories(basePackages="com.baeldung.springbootcrudapp.application.repositories")
+@EnableTransactionManagement
+@EntityScan(basePackages="com.baeldung.springbootcrudapp.application.entities")
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+}

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/springbootcrudapp/application/controllers/UserController.java

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+package com.baeldung.springbootcrudapp.application.controllers;
+
+import com.baeldung.springbootcrudapp.application.repositories.UserRepository;
+import com.baeldung.springbootcrudapp.application.entities.User;
+import javax.validation.Valid;
+import org.springframework.beans.factory.annotation.Autowired;
+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.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+
+@Controller
+public class UserController {
+    
+    private final UserRepository userRepository;
+
+    @Autowired
+    public UserController(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+    
+    @GetMapping("/signup")
+    public String showSignUpForm(User user) {
+        return "add-user";
+    }
+    
+    @PostMapping("/adduser")
+    public String addUser(@Valid User user, BindingResult result, Model model) {
+        if (result.hasErrors()) {
+            return "add-user";
+        }
+        
+        userRepository.save(user);
+        model.addAttribute("users", userRepository.findAll());
+        return "index";
+    }
+    
+    @GetMapping("/edit/{id}")
+    public String showUpdateForm(@PathVariable("id") long id, Model model) {
+        User user = userRepository.findById(id).orElseThrow(() -> new IllegalArgumentException("Invalid user Id:" + id));
+        model.addAttribute("user", user);
+        return "update-user";
+    }
+    
+    @PostMapping("/update/{id}")
+    public String updateUser(@PathVariable("id") long id, @Valid User user, BindingResult result, Model model) {
+        if (result.hasErrors()) {
+            user.setId(id);
+            return "update-user";
+        }
+        
+        userRepository.save(user);
+        model.addAttribute("users", userRepository.findAll());
+        return "index";
+    }
+    
+    @GetMapping("/delete/{id}")
+    public String deleteUser(@PathVariable("id") long id, Model model) {
+        User user = userRepository.findById(id).orElseThrow(() -> new IllegalArgumentException("Invalid user Id:" + id));
+        userRepository.delete(user);
+        model.addAttribute("users", userRepository.findAll());
+        return "index";
+    }
+}

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/springbootcrudapp/application/entities/User.java

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+package com.baeldung.springbootcrudapp.application.entities;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.validation.constraints.NotBlank;
+
+@Entity
+public class User {
+    
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+    @NotBlank(message = "Name is mandatory")
+    private String name;
+    
+    @NotBlank(message = "Email is mandatory")
+    private String email;
+
+    public User() {}
+
+    public User(String name, String email) {
+        this.name = name;
+        this.email = email;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+    
+    public long getId() {
+        return id;
+    }
+    
+    public void setName(String name) {
+        this.name = name;
+    }
+    
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" + "id=" + id + ", name=" + name + ", email=" + email + '}';
+    }
+}

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/springbootcrudapp/application/repositories/UserRepository.java

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+package com.baeldung.springbootcrudapp.application.repositories;
+
+import com.baeldung.springbootcrudapp.application.entities.User;
+import java.util.List;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends CrudRepository<User, Long> {
+    
+    List<User> findByName(String name);
+    
+}