Spring MVC

BarCode in Spring MVC Framework and Spring Data JPA


Create Spring MVC Project

On the Eclipse, create a Spring MVC project in Spring Boot

Enter Project Information:

  • Name: LearnSpringMVCWithRealApps
  • Group: com.demo
  • Artifact: LearnSpringMVCWithRealApps
  • Description: Learn Spring MVC with Real Apps
  • Package: com.demo

Select the technologies and libraries to be used:

  • Web
  • JPA
  • MySQL

Click Next button to show Site Information for project

Click Finish button to finish create Spring MVC project




Configure 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
						http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.demo</groupId>
	<artifactId>LearnSpringMVCWithRealApps</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>LearnSpringMVCWithRealApps</name>
	<description>Learn Spring MVC with Real Apps</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.5.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<!-- JSTL tag lib -->
		<dependency>
			<groupId>javax.servlet.jsp.jstl</groupId>
			<artifactId>javax.servlet.jsp.jstl-api</artifactId>
			<version>1.2.1</version>
		</dependency>

		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</version>
		</dependency>

		<!-- Tomcat for JSP rendering -->
		<dependency>
			<groupId>org.apache.tomcat.embed</groupId>
			<artifactId>tomcat-embed-jasper</artifactId>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>

		<dependency>
			<groupId>com.google.zxing</groupId>
			<artifactId>core</artifactId>
			<version>3.3.3</version>
		</dependency>

		<dependency>
			<groupId>com.google.zxing</groupId>
			<artifactId>javase</artifactId>
			<version>3.3.3</version>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-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>

Create Database

Create a database with the name is learn_spring_mvc_with_real_apps. This database have 1 table: Product table

--
-- Table structure for table `product`
--

CREATE TABLE `product` (
  `id` int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT,
  `name` varchar(250) NOT NULL,
  `price` decimal(10,1) NOT NULL,
  `quantity` int(11) NOT NULL,
  `status` tinyint(1) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

--
-- Dumping data for table `product`
--

INSERT INTO `product` (`id`, `name`, `price`, `quantity`, `status`) VALUES
('p03', 'Name 3', 300, 4, 1),
('p02', 'Name 2', 200, 3, 0),
('p01', 'Name 1', 100, 2, 1),
('p05', 'name 5', 11, 2, 1);

Structure of Product Table

Data of Product Table




Configure application.properties

spring.mvc.view.prefix = /WEB-INF/views/
spring.mvc.view.suffix = .jsp
spring.mvc.static-path-pattern=/resources/**

spring.datasource.url= jdbc:mysql://localhost:3306/learn_spring_mvc_with_real_apps
spring.datasource.username=root
spring.datasource.password=123456

server.port=9596

Entities Class

Create new package, named com.demo.entities. In this package, create entities class as below:

Product Entity

Create new java class, named Product.java

package com.demo.entities;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "product")
public class Product {

	@Id
	private String id;
	private String name;
	private double price;
	private int quantity;
	private boolean status;

	public String getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public double getPrice() {
		return price;
	}

	public void setPrice(double price) {
		this.price = price;
	}

	public int getQuantity() {
		return quantity;
	}

	public void setQuantity(int quantity) {
		this.quantity = quantity;
	}

	public boolean isStatus() {
		return status;
	}

	public void setStatus(boolean status) {
		this.status = status;
	}

}

Create ZXing Helper

Create new package named com.demo.helpers. In this package create new java class named ZXingHelper.java use generate BarCode as below:

package com.demo.helpers;

import java.io.ByteArrayOutputStream;
import java.util.Hashtable;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.Writer;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.oned.Code128Writer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class ZXingHelper {

	public static byte[] getBarCodeImage(String text, int width, int height) {
		try {
			Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<>();
			hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
			Writer writer = new Code128Writer();
			BitMatrix bitMatrix = writer.encode(text, BarcodeFormat.CODE_128, width, height);
			ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
			MatrixToImageWriter.writeToStream(bitMatrix, "png", byteArrayOutputStream);
			return byteArrayOutputStream.toByteArray();
		} catch (Exception e) {
			return null;
		}
	}

}




Create ProductRepository Interface

Create new package named com.demo.repositories. In this package create the ProductRepository interface implements from CrudRepository interface of Spring Data JPA that provides CRUD Operations for an entity.

package com.demo.repositories;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.demo.entities.Product;

@Repository("productRepository")
public interface ProductRepository extends CrudRepository<Product, String> {
}

Create ProductService Interface

Create new package named com.demo.services. In this package create the ProductService interface as below:

package com.demo.services;

import com.demo.entities.Product;

public interface ProductService {

	public Iterable<Product> findAll();

}

Create ProductServiceImpl class

In com.demo.services package, create ProductServiceImpl class implements method from ProductService interfaces

package com.demo.services;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.demo.entities.Product;
import com.demo.repositories.ProductRepository;

@Service("productService")
public class ProductServiceImpl implements ProductService {

	@Autowired
	private ProductRepository productRepository;

	@Override
	public Iterable<Product> findAll() {
		return productRepository.findAll();
	}

}

Create Controllers

Create new package named com.demo.controllers. In this package, create new java class named ProductController.java

package com.demo.controllers;

import java.io.OutputStream;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.demo.helpers.ZXingHelper;
import com.demo.services.ProductService;

@Controller
@RequestMapping("product")
public class ProductController {

	@Autowired
	private ProductService productService;

	@RequestMapping(method = RequestMethod.GET)
	public String index(ModelMap modelMap) {
		modelMap.put("products", productService.findAll());
		return "product/index";
	}

	@RequestMapping(value = "barcode/{id}", method = RequestMethod.GET)
	public void barcode(@PathVariable("id") String id, HttpServletResponse response) throws Exception {
		response.setContentType("image/png");
		OutputStream outputStream = response.getOutputStream();
		outputStream.write(ZXingHelper.getBarCodeImage(id, 200, 200));
		outputStream.flush();
		outputStream.close();
	}

}




Create Views

Create new folders with path webapp\WEB-INF\views in src\main. In views folder, create new folder named product. In product folder, create new JSP Page named index.jsp as below:

<%@ 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" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>QR Code</title>
</head>
<body>

	<h3>Product List</h3>
	<table border="1" cellpadding="2" cellspacing="2">
		<tr>
			<th>Id</th>
			<th>Name</th>
			<th>Price</th>
			<th>Quantity</th>
			<th>Status</th>
			<th>BarCode</th>
		</tr>
		<c:forEach var="product" items="${products }">
			<tr>
				<td>${product.id }</td>
				<td>${product.name }</td>
				<td>${product.price }</td>
				<td>${product.quantity }</td>
				<td>${product.status }</td>
				<td>
					<img src="${pageContext.request.contextPath }/product/barcode/${product.id }" width="200" height="50">
				</td>
			</tr>
		</c:forEach>
	</table>

</body>
</html>

Structure of Spring MVC Project




Run Application

Select LearnSpringMVCWithRealAppsApplication.java file in com.demo package, right click and select Run As/Spring Boot App menu

Access index method in product controller with following url: http://localhost:9596/product

Output

References

I recommend you refer to the books below to learn more about the knowledge in this article:


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