Spring Boot + PostgreSQL + JSP CRUD

In this section, we will learn how to develop a basic Student Management Application using Spring Boot 3, Spring Data JPA, PostgreSQL, & JSP. The GitHub repository link is provided at the end of this tutorial. 

Note 

A quick side note here is that JSP has limitations on its own and even more so when combined with Spring Boot. So, we should consider the following template engines as better alternatives to JSP. 


Student List:


Add Student:


Update Student:



Tools and Technologies Used:

  • Spring Boot - 3.0.1
  • Java 17
  • Spring Framework - 6.0.3
  • Spring Data JPA - 3.0.1
  • Hibernate - 6.1.6.Final
  • Maven - 3.2+
  • PostgreSQL
  • JSP

Final Project Directory:



pom.xml

A Project Object Model or POM is the fundamental unit of work in Maven. It is an XML file that contains information about the project and configuration details utilized by Maven to build the project.
<?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
   https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>3.0.1</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.knf.dev.demo</groupId>
   <artifactId>spring-boot-jsp-postgresql-crud</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>spring-boot-jsp-postgresql-crud</name>
   <description>Demo project for Spring Boot</description>
   <properties>
      <java.version>17</java.version>
   </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.postgresql</groupId>
         <artifactId>postgresql</artifactId>
         <scope>runtime</scope>
      </dependency>
      <!-- JSP -->
      <dependency>
         <groupId>org.apache.tomcat.embed</groupId>
         <artifactId>tomcat-embed-jasper</artifactId>
      </dependency>
      <!-- jstl for jsp -->
      <dependency>
         <groupId>org.glassfish.web</groupId>
         <artifactId>jakarta.servlet.jsp.jstl</artifactId>
         <version>2.0.0</version>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>

   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
      </plugins>
   </build>

</project>


Configuring PostgreSQL Database and JSP View Resolver

First, you need to create a database in the PostgreSQL server. You can use the following command to create a database in the PostgresSQL server:
CREATE DATABASE students;

Now, let’s configure the Spring Boot application to use PostgreSQL as our data source. You can do that simply by adding PostgreSQL database URL, username, and password in the src/main/resources/application.properties file.

Open src/main/resources/application.properties file and add the following content to it:

spring.datasource.url=jdbc:postgresql://localhost:5432/students
spring.datasource.username=postgres
spring.datasource.password=root
spring.jpa.show-sql=true

# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto = update

spring.mvc.view.prefix: /WEB-INF/jsp/
spring.mvc.view.suffix: .jsp


Create the JPA Entity - Student.java

package com.knf.dev.demo.crudapp.model;

import jakarta.persistence.*;

@Entity
@Table
public class Student {
   
   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Long id;
   
   @Column(name="first_name")
   private String firstName;
   
   @Column(name="last_name")
   private String lastName;

   @Column(name="email_id")
   private String emailId;

   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   public String getFirstName() {
      return firstName;
   }

   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }

   public String getLastName() {
      return lastName;
   }

   public void setLastName(String lastName) {
      this.lastName = lastName;
   }

   public String getEmailId() {
      return emailId;
   }

   public void setEmailId(String emailId) {
      this.emailId = emailId;
   }
}


Spring Data JPA Repository Interface - StudentRepository.java

package com.knf.dev.demo.crudapp.repository;

import com.knf.dev.demo.crudapp.model.Student;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;


@Repository
public interface StudentRepository extends JpaRepository<Student, Long>{

}


Create Student Service Interface - StudentService.java

package com.knf.dev.demo.crudapp.service;

import com.knf.dev.demo.crudapp.dto.StudentDTO;
import java.util.List;

public interface StudentService {

   public void createOrUpdateStudent(StudentDTO empDTO);
   
   public List<StudentDTO> getAllStudent();
   
   public void deleteStudent(Long id);
   
   public StudentDTO editStudent(Long id);
   
}


Create Student Service Implementation - StudentServiceImpl

package com.knf.dev.demo.crudapp.serviceImpl;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import com.knf.dev.demo.crudapp.dto.StudentDTO;
import com.knf.dev.demo.crudapp.model.Student;
import com.knf.dev.demo.crudapp.repository.StudentRepository;
import com.knf.dev.demo.crudapp.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class StudentServiceImpl implements StudentService {
   
   @Autowired
   private StudentRepository studentRepository;

   public void createOrUpdateStudent(StudentDTO studentDTO) {
      Student student = convertDtoToModel(studentDTO);
      studentRepository.save(student);
   }
   
   public List<StudentDTO> getAllStudent() {
      List<Student> list = studentRepository.findAll();
      List<StudentDTO> userList = list.stream()
               .map(StudentDTO::new)
               .collect(Collectors.toCollection(ArrayList::new));
      return userList;
   }
   
   public void deleteStudent(Long id) {
      studentRepository.deleteById(id);
   }
   
   public StudentDTO editStudent(Long id) {
      Student student = studentRepository.getReferenceById(id);
      return convertModelToDTO(student);
   }
   
   private Student convertDtoToModel(StudentDTO userDto) {
      Student student = new Student();
      if (userDto.getId() != null) {
         student.setId(userDto.getId());
      }
      student.setEmailId(userDto.getEmailId());
      student.setFirstName(userDto.getFirstName());
      student.setLastName(userDto.getLastName());
      return student;
   }
   
   private StudentDTO convertModelToDTO(Student student) {
      StudentDTO studentDTO = new StudentDTO();
      studentDTO.setId(student.getId());
      studentDTO.setEmailId(student.getEmailId());
      studentDTO.setFirstName(student.getFirstName());
      studentDTO.setLastName(student.getLastName());
      return studentDTO;
   }
}


Create Student DTO - StudentDTO.java

package com.knf.dev.demo.crudapp.dto;

import com.knf.dev.demo.crudapp.model.Student;

public class StudentDTO {
   
   private Long id;
   private String firstName;
   private String lastName;
   private String emailId;
   
   public StudentDTO() {
   }
   
   public StudentDTO(Student employee) {
      this.firstName = employee.getFirstName();
      this.lastName = employee.getLastName();
      this.emailId = employee.getEmailId();
      this.id = employee.getId();
   }

   public String getFirstName() {
      return firstName;
   }

   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }

   public String getLastName() {
      return lastName;
   }

   public void setLastName(String lastName) {
      this.lastName = lastName;
   }

   public String getEmailId() {
      return emailId;
   }

   public void setEmailId(String emailId) {
      this.emailId = emailId;
   }

   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }
}


Create Student Controller - StudentController.java

package com.knf.dev.demo.crudapp.controller;

import java.util.List;
import java.util.Map;
import com.knf.dev.demo.crudapp.dto.StudentDTO;
import com.knf.dev.demo.crudapp.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class StudentController {

   @Autowired
   private StudentService studentService;
   
   @GetMapping(value = {"/","/registration"})
   public String registration(Map<String, Object> model) {
      model.put("student", new StudentDTO());
      return "student-add-update";
   }
   
   @PostMapping("/home")
   public String createStudent
         (@ModelAttribute("student") StudentDTO studentDto) {
      studentService.createOrUpdateStudent(studentDto);
      return "redirect:/list";   
   }
   
   @GetMapping("/list")
   public String listOfStudent(Model model) {
      List<StudentDTO> studentList = studentService.getAllStudent();
      model.addAttribute("studentList", studentList);
      return "student-list";
   }
   
   @PostMapping("/delete")
   public String deleteStudent(@RequestParam("id") String id) {
      studentService.deleteStudent(Long.parseLong(id));
      return "redirect:/list";      
   }
   
   @GetMapping("/edit")
   public String editStudent(
         @RequestParam("id") String id, Map<String, Object> model) {
      StudentDTO studentDTO = studentService
            .editStudent(Long.parseLong(id));
      model.put("student", studentDTO);
      return "student-add-update";
   }
   
}


View - student-add-update.jsp

<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Student Management</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
 href="https://use.fontawesome.com/releases/v5.4.1/css/all.css">
<link rel="stylesheet"
 href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css">
<script
 src="https://cdn.jsdelivr.net/npm/jquery@3.6.0/dist/jquery.slim.min.js">

</script>
<script
 src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js">
</script>
</head>
<body >
<div class="container my-5">
<h2>Student <c:out value="${student.id != null ? 'Update' : 'Registration' }" /></h2>
<div class="card">
            <div class="card-body">
                <div class="col-md-10">
<form:form method="POST" modelAttribute="student" action="/home" name="student">
      <form:hidden path="id"/>

    <div class="row">
       <div class="form-group col-md-8">
       <label for="name" class="col-form-label"> First Name
                                                        </label>
        <form:input path="firstName" id="fname" class="form-control" />
      </div>

         <div class="form-group col-md-8">
         <label for="name" class="col-form-label"> Last Name
                                                     </label>
        <form:input path="lastName" id="lname" class="form-control"/>
         </div>

        <div class="form-group col-md-8">
        <label for="email" class="col-form-label" > Email
                                                       </label>
        <form:input path="emailId" id="emailId" class="form-control"/>
        </div>
       </div>

        <div class="col-md-6">
        <input type="submit" class="btn btn-success"
           value="<c:out value="${student.id != null ? 'Update' : 'Register' }" />">&nbsp;&nbsp;
         <a href="/list">Student List</a>&nbsp;
         <c:if test="${student.id ne null}"><b>|</b>&nbsp;<a href="/registration">Registration</a></c:if>
         </div>

       </form:form>
              </div>
            </div>
        </div>
    </div>
</body>
</html>


View - student-list.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="stag" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Student Management</title>
<meta name="viewport" content="width=device-width, initial-scale=1">

<link rel="stylesheet"
 href="https://use.fontawesome.com/releases/v5.4.1/css/all.css">
<link rel="stylesheet"
 href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css">
<script
 src="https://cdn.jsdelivr.net/npm/jquery@3.6.0/dist/jquery.slim.min.js">
</script>
<script
 src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js">
</script>
</head>
<body>

 <div class="container my-2">
        <div class="card">
            <div class="card-body">
             <p class="my-5">
                <a href="/registration" class="btn btn-success">
                Add User</a>
             </p>
   <div class="col-md-10">
   <table class="table table-striped table-responsive-md">
      <tr>
         <th>First Name</th>
         <th>Last Name</th>
         <th>Email Id</th>
         <th></th>
         <th></th>
      </tr>
      <c:forEach items="${studentList}" var="student">
         <tr>
            <td>${student.firstName}</td>
            <td>${student.lastName}</td>
            <td>${student.emailId}</td>
            <td>
               <a class="btn btn-warning" href="/edit?id=${student.id}" >
               Edit</a>
            </td>
            <td>
               <form action="/delete?id=${student.id}" method="post">
                  <input class="btn btn-danger" type="submit" value="Delete" />
               </form>
            </td>
         </tr>
      </c:forEach>
   </table>
     </div>
   </div>
  </div>
</div>
</body>
</html>


Run the application - Application.java

package com.knf.dev.demo.crudapp;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

   public static void main(String[] args) {
      SpringApplication.run(Application.class, args);
   }

}

Application is the entry point that sets up the Spring Boot application. The @SpringBootApplication annotation enables auto-configuration and component scanning.

Let's run this Spring boot application from either IntelliJ IDEA IDE by right click - Run 'Application.main()'
Or you can use the below maven command to run:

mvn spring-boot:run
From the browser call the endpoint http://localhost:8080

Download Source Code

$ git clone https://github.com/knowledgefactory4u/KnowledgeFactory

More related topics, 

Popular posts from this blog

Learn Java 8 streams with an example - print odd/even numbers from Array and List

Example 1: Java 8 program to print odd numbers from a List   import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; /*Java 8 Program to find Odd Numbers from a List*/ public class DriverClass { public static void main( String [] args) { List < Integer > numbers = Arrays. asList( 1 , 4 , 8 , 40 , 11 , 22 , 33 , 99 ); List < Integer > oddNumbers = numbers.stream(). filter(o -> o % 2 != 0 ). collect(Collectors.toList()); System.out.println(oddNumbers); } } 1. Initialize List using Arrays.asList() method. Java's built-in Arrays.asList() method converts an array into a list. This method takes an array as an argument and returns a List object. 2.  Java List interface provides stream() method which returns a sequential Stream with list of Integer as its source. 3. The Java stream filter() method allow
Read more

Java Stream API - How to convert List of objects to another List of objects using Java streams?

Image
In this section, we will show you how to convert a List of objects to another List of objects in Java using the Java streams map(). The ‘map’ method maps each element to its corresponding result. Java Stream API   The Java Stream API provides a functional programming approach over the object oriented capabilities of Java. It is used for processing collections of objects. The Stream in Java can be defined as a sequence of elements from a source List, Set or Array. Most of the stream operations return a Stream. This avails engender a chain of stream operations(stream pipe-lining). The streams withal support the aggregate or terminal operations on the elements. for example, finding the sum or maximum element or finding the average etc...Stream operations can either be executed sequentially or parallel. when performed parallelly, it is called a parallel stream.   Stream map() Method   The Java 8 Stream map() is an intermediate operation. It converts Stream<obj1> to Stream<obj2>
Read more

Registration and Login with Spring Boot + Spring Security + Thymeleaf

Image
In this section, we will learn how to create user registration and login using Spring boot, Spring security, Thymeleaf, JPA, and H2DB. The GitHub repository link is provided at the end of this tutorial. You can download the source code. Technologies used: Spring Boot 2.5.5  Spring Data JPA  Spring Security  Thymeleaf  Maven 3+  Java 17  H2 Database   User Interface User Registration Authentication Failed Authentication success Sign out Final Project Structure: Complete pom.xml: <? 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 https://maven.apache.org/xsd/maven-4.0.0.xsd" > < modelVersion >4.0.0</ modelVersion > < parent > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-pare
Read more

Java, Spring Boot Mini Project - Library Management System - Download

Image
Hello everyone, Hope you are doing well. Here, we provide a Library Management System mini-project for beginners, it's free for download. Maybe you can build more on top of this project and create your own product, that's all about you. The source code download link is provided at the end of this post. 1. Benefit of this project You could cover the following technologies and features by learning and debugging this mini project. Java 17 Java Stream Java Lamda Expressions Java Records Functional programming Object-oriented programming var Keyword in Java Generics in Java Java Switch Spring boot 2.6.4 Spring Security Thymeleaf template engine OpenCSV Spring Data JPA Server Side Pagination H2 Database  Bootstrap HTML CSS and more... 2. Objective Of Spring Boot On Library Management System The main objective of this project is to manage the details of the books, author, category, and publisher. Only Admin/Librarian will manage all these activities. Also, they can export the data in
Read more

ReactJS, Spring Boot JWT Authentication Example

Image
In this tutorial, we’ll create a user registration & login example using ReactJS, Spring Boot, Spring Security, and JWT authentication. You could download the source code from our Github repository, the download link is provided at the end of this tutorial. Technologies used Backend Technologies: Java 17 Spring Boot 2.7.0 Spring Security Spring Data JPA JWT H2 Database Frontend Technologies: React 17.0.1 Axios 0.27.2 Redux 4.0.5 Bootstrap 4.5.2 ReactJS - SpringBoot - JWT - Flow Backend Project Directory: Frontend Project Directory: Following is the screenshot of our application - User Registration: User Signin: Profile View: Access Resource: We will build two projects:  1. Backend:   spring-boot-security-jwt 2. Frontend: react-redux-jwt Project 1: spring-boot-security-jwt Pom.xml <?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"
Read more

Spring Boot + Mockito simple application with 100% code coverage

Image
In this article, we will show you a simple  Spring Boot example to demonstrate test methods for Controllers, Service, and Repository, And code coverage analysis using the EclEmma plugin. Technologies used: Spring Boot 2.6.4 Mockito 3.11.2 Maven 3+ EclEmma plugin Junit 5 Java 17 A quick overview of  Spring Boot, Mockito, and EclEmma plugin Spring boot: Spring boot to develop REST web services and microservices. Spring Boot has taken the Spring framework to the next level. It has drastically reduced the configuration and setup time required for spring projects. We can set up a project with almost zero configuration and start building the things that actually matter to your application. Mockito: Mockito is a mocking framework, a JAVA-predicated library that is utilized for efficacious unit testing of JAVA applications. Mockito is utilized to mock interfaces so that a dummy functionality can be integrated into a mock interface that can be utilized in unit testing. EclEmma : E
Read more

Top 5 Java ORM tools - 2024

Image
  The term ORM refers to object-relational mapping, which uses objects to adapt programming languages to database systems while allowing them to function with SQL and object-oriented programming ideas. Any kind of database management system that can accomplish object mapping to the table in the virtual system is suitable for the implementation of ORM. Java has a wide variety of ORM tools, some of which are mentioned below: 1. Hibernate Hibernate is a lightweight, open-source, non-invasive Java ORM (Object-Relational Mapping) framework that allows developers to create objects that function independently of database software and create persistence logic in any Java or JavaEE application. It offers an abstraction layer, so developers don't have to bother about implementations; Hibernate handles these tasks internally, such as connecting to databases and creating queries to carry out CRUD operations, among other things. Persistence logic development is done with it. Persistence logic r
Read more

Java - Blowfish Encryption and decryption Example

Image
Blowfish is an encryption method developed by Bruce Schneier in 1993 as an alternative to the DES encryption method. It is significantly faster than DES and provides good encryption speed, although no effective cryptanalysis technique has been found to date. It is one of the first secure block ciphers that is not protected by any patents and is therefore freely available for anyone to use. This is a symmetric block cipher algorithm. Block size: 64 bits Key size: variable size from 32 to 448 bits number of subsections: 18 [P-array] number of rounds: 16 number of substitution blocks: 4 [each with 512 records of 32 bits each] develop  Example 1: Encryption and decryption using Blowfish import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.util.Base64; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeExc
Read more

Spring boot video streaming example-HTML5

Image
Hello everyone, Today we will learn how to stream MP4 video using Spring Boot and Spring Web Flux.  The Source code download link is provided at the end of this post. New, Quarkus Practice User Interface   Project Structure: G radle(build.gradle) plugins { id 'org.springframework.boot' version '2.5.4' id 'io.spring.dependency-management' version '1.0.11.RELEASE' id 'java' } group = 'com.knf.demo' version = '0.0.1-SNAPSHOT' sourceCompatibility = '11' repositories { mavenCentral() } dependencies { implementation 'org.springframework.boot:spring-boot-starter-webflux' testImplementation 'org.springframework.boot:spring-boot-starter-test' testImplementation 'io.projectreactor:reactor-test' } test { useJUnitPlatform() } Service (VideoStreamingService.java) package  com.knf.demo.service ; import org.springframework.beans.factory.annotation. Autowired ; import org.springframew
Read more

Google Cloud Storage + Spring Boot - File Upload, Download, and Delete

Image
In this section, we will learn  how to  create a simple spring boot application to perform different file operations such as upload, download, list, and delete files from the Google Cloud Storage. 1.  A little bit of Background Google Cloud Storage Cloud Storage is a managed service for storing unstructured data. Store any amount of data and retrieve it as often as you like. More Info - click here! Spring Boot Spring Boot makes it easy to create stand-alone, production-grade Spring-based Applications that you can "just run".  More Info - click here! 2. Create a GCP Project First, Sign into the Google console at  https://console.cloud.google.com . You can create a new project by first selecting the project dropdown in the top left and selecting " New Project ". Next, specify your GCP  Project name  and  Project ID . Then  Click on the " CREATE " button. Copy " Project ID " and keep it for future purposes. 3. Create a Google Cloud Storage bucket Fr
Read more