Spring Boot + Thymyleaf Mission in Java? Instance Tutorial

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2. Legitimate XML
3. XHTML
4. Legitimate XHTML
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6. Legacy HTML5

Learn how to use Thymeleaf with Spring Boot in Java?

<?xml model="1.0" encoding="UTF-8"?>
<undertaking 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 
   https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<dad or mum>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<model>2.6.0</model>
<relativePath/> <!-- lookup dad or mum from repository -->
   </dad or mum>
<groupId>com.pupil</groupId>
<artifactId>crudapp</artifactId>
<model>0.0.1-SNAPSHOT</model>
<title>crudapp</title>
<description>Demo undertaking for Spring Boot</description>
<properties>
<java.model>1.8</java.model>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optionally available>true</optionally available>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>check</scope>
<exclusions>
<exclusion>
<groupId>org.junit.classic</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<construct>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</construct>
</undertaking>

bundle com.pupil.crudapp.mannequin;
import javax.persistence.*;
@Entity
@Desk(title = "STUDENT")
public class Pupil {
@Column(title = "id")
@Id
    @GeneratedValue(technique=GenerationType.AUTO)
personal int id;
@NotBlank(message = "Title is necessary")
@Column(title = "title")
personal String title;
@NotBlank(message = "Electronic mail is necessary")
@Column(title = "electronic mail")
personal String electronic mail;
@NotBlank(message = "Grade is necessary")
@Column(title = "grade")
personal String grade;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return title;
}
public void setName(String title) {
this.title = title;
}
public String getEmail() {
return electronic mail;
}
public void setEmail(String electronic mail) {
this.electronic mail = electronic mail;
}
public String getGrade() {
return grade;
}
public void setGrade(String grade) {
this.grade = grade;
}
@Override
    public String toString() {
return "Pupil{" +
"id=" + id +
", title="" + title + "'' +
", electronic mail="" + electronic mail + "'' +
", grade="" + grade + "'' +
'}';
}
}




We've got annotated the mannequin class with @Entity annotation which is chargeable for make CRUD operations on area entities. Right here, used @NotBlank annotation is a hibernate validator which is able to validating the constrained fields earlier than persisting or updating an entity within the database.






The Repository Layer
Spring knowledge JPA permits to implement the JPA-based repositories with minimal efforts. 
Spring Knowledge JPA is an important element of Spring Boot's spring-boot-starter-data-jpa that gives a strong layer of abstraction on prime of a JPA implementation to make it simple so as to add CRUD performance. We could entry the persistence layer by means of this abstraction layer as a substitute of writing our personal DAO implementations from begin.
To make the crud funtionalities inside our projec, we extends the StudentRepository interface with CrudRepository. The instance code is given under.

bundle com.pupil.crudapp.repository;
import com.pupil.crudapp.mannequin.Pupil;
import org.springframework.knowledge.repository.CrudRepository;
import java.util.Checklist;
public interface StudentRepository extends CrudRepository<Pupil, Integer> {
Checklist<Pupil> findAll();
Pupil findById(int id);
int deleteById(int id);
}

The Controller Layer

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