Generate Random values in Spring boot

In this tutorial we will look into the ways of generating a random string or integer values in Spring boot:

Find this project on Github

https://github.com/javacodenet/random-generator/

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.javacodenet</groupId>
	<artifactId>spring-boot</artifactId>
	<version>1.0-SNAPSHOT</version>
	<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>1.4.0.RELEASE</version>
	</parent>
	<dependencies>
	<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
	</dependency>
	</dependencies>
	<build>
	<plugins>
	<plugin>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-maven-plugin</artifactId>
	</plugin>
	</plugins>
	</build>
	</project>

view raw pom.xml hosted with ❤ by GitHub

Application.java

	package com.javacodenet;
	import org.springframework.beans.factory.annotation.Autowired;
	import org.springframework.boot.SpringApplication;
	import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
	import org.springframework.boot.autoconfigure.SpringBootApplication;
	import org.springframework.web.bind.annotation.RequestMapping;
	import org.springframework.web.bind.annotation.RestController;
	@RestController
	@EnableAutoConfiguration
	@SpringBootApplication
	public class Application {
	@Autowired
	RandomValues randomValues;
	@RequestMapping("/random")
	public String randomMessage() {
	return "Your random string message is: " + randomValues.getRandomStringMessage()
	+ ", Your random integer value is: " + randomValues.getRandomInteger()
	+ ", Your random integer value with 50 to 500 range: " + randomValues.getRandomIntegerWithRange()
	+ ", Your random integer value with 1 to 10 range : " + randomValues.getRandomIntegerWithSpecialRange();
	}
	public static void main(String[] args) {
	SpringApplication.run(Application.class, args);
	}
	}

view raw Application.java hosted with ❤ by GitHub

RandomValues.java

Bean with random values injected from the configuration file.

	package com.javacodenet;
	import org.springframework.beans.factory.annotation.Value;
	import org.springframework.stereotype.Component;
	@Component
	public class RandomValues {
	@Value("${randomStringMessage}")
	private String randomStringMessage;
	@Value("${randomInteger}")
	private String randomInteger;
	@Value("${randomIntegerWithRange}")
	private String randomIntegerWithRange;
	@Value("${randomIntegerWithSpecialRange}")
	private String randomIntegerWithSpecialRange;
	public String getRandomStringMessage() {
	return randomStringMessage;
	}
	public void setRandomStringMessage(String randomStringMessage) {
	this.randomStringMessage = randomStringMessage;
	}
	public String getRandomInteger() {
	return randomInteger;
	}
	public void setRandomInteger(String randomInteger) {
	this.randomInteger = randomInteger;
	}
	public String getRandomIntegerWithRange() {
	return randomIntegerWithRange;
	}
	public void setRandomIntegerWithRange(String randomIntegerWithRange) {
	this.randomIntegerWithRange = randomIntegerWithRange;
	}
	public String getRandomIntegerWithSpecialRange() {
	return randomIntegerWithSpecialRange;
	}
	public void setRandomIntegerWithSpecialRange(String randomIntegerWithSpecialRange) {
	this.randomIntegerWithSpecialRange = randomIntegerWithSpecialRange;
	}
	}

view raw RandomValues.java hosted with ❤ by GitHub

application.properties

A configuration file containing random value definitions.

	server.context-path=/randomGenerator
	randomStringMessage = ${random.value}
	randomInteger = ${random.int}
	#Generates random integer from 50 to 499, 500 is exclusive, don't add any spaces between values
	randomIntegerWithRange = ${random.int(50,500)}
	#paranthesis can be replaced with special characters
	randomIntegerWithSpecialRange = ${random.int#1,10#}

view raw application.properties hosted with ❤ by GitHub

Output