Spring boot: RandomValuePropertySource: Working with random values

The RandomValuePropertySource is useful for injecting random values. You can generate random integers, longs, uuids, or strings.

Example

app.secret=${random.value}

app.number=${random.int}

app.bignumber=${random.long}

app.uuid=${random.uuid}

app.number.less.than.fifty=${random.int(50)}

app.number.in.range=${random.int[500,1000]}

You can inject them in java application like below.

@Value("${app.secret}")

private String secret;

@Value("${app.number}")

private int number;

@Value("${app.bignumber}")

private long bigNumber;

@Value("${app.uuid}")

private String uuid;

@Value("${app.number.less.than.fifty}")

private int numberLessThan50;

@Value("${app.number.in.range}")

private int numberInRange;

Find the below working example

application.properties

app.secret=${random.value}
app.number=${random.int}
app.bignumber=${random.long}
app.uuid=${random.uuid}
app.number.less.than.fifty=${random.int(50)}
app.number.in.range=${random.int[500,1000]}

ConfigBean.java

package com.sample.myApp.model;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class ConfigBean {

 @Value("${app.secret}")
 private String secret;

 @Value("${app.number}")
 private int number;

 @Value("${app.bignumber}")
 private long bigNumber;

 @Value("${app.uuid}")
 private String uuid;

 @Value("${app.number.less.than.fifty}")
 private int numberLessThan50;

 @Value("${app.number.in.range}")
 private int numberInRange;

 public String getSecret() {
  return secret;
 }

 public void setSecret(String secret) {
  this.secret = secret;
 }

 public int getNumber() {
  return number;
 }

 public void setNumber(int number) {
  this.number = number;
 }

 public long getBigNumber() {
  return bigNumber;
 }

 public void setBigNumber(long bigNumber) {
  this.bigNumber = bigNumber;
 }

 public String getUuid() {
  return uuid;
 }

 public void setUuid(String uuid) {
  this.uuid = uuid;
 }

 public int getNumberLessThan50() {
  return numberLessThan50;
 }

 public void setNumberLessThan50(int numberLessThan50) {
  this.numberLessThan50 = numberLessThan50;
 }

 public int getNumberInRange() {
  return numberInRange;
 }

 public void setNumberInRange(int numberInRange) {
  this.numberInRange = numberInRange;
 }

}

Application.java

package com.sample.myApp;

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

import com.sample.myApp.model.ConfigBean;

import org.springframework.boot.context.config.RandomValuePropertySource;

@SpringBootApplication
public class Application {

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

  ConfigBean configBean = applicationContext.getBean(ConfigBean.class);
  long bigNumber = configBean.getBigNumber();
  int number = configBean.getNumber();
  int numberInRange = configBean.getNumberInRange();
  int numberLessThan50 = configBean.getNumberLessThan50();
  String secret = configBean.getSecret();
  String uuid = configBean.getUuid();

  System.out.println("******************************");

  System.out.printf("bigNumber : %d \n", bigNumber);
  System.out.printf("number : %d \n", number);
  System.out.printf("numberInRange : %d \n", numberInRange);
  System.out.printf("numberLessThan50 : %d \n", numberLessThan50);
  System.out.printf("secret : %s \n", secret);
  System.out.printf("uuid : %s \n", uuid);

  System.out.println("******************************");

  SpringApplication.exit(applicationContext);
 }

}

When you ran 'Application.java', you can able to see below messages in console.

******************************
bigNumber : -3064097796043813516 
number : -110057729 
numberInRange : 660 
numberLessThan50 : 4 
secret : cc970482bdd5f1f3155019c7016904dc 
uuid : c069726a-c605-4dc4-84a1-761fc02acc59 
******************************

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