How to write a simple Spring Boot Application to encrypt and decrypt?

Here I will be using crypto library from BouncyCastleProvider and implement it in spring boot application. Find below the simplest code that I have attached even for beginners to follow through.

package demo;
import org.jasypt.encryption.pbe.PooledPBEStringEncryptor;
import org.jasypt.encryption.pbe.config.SimpleStringPBEConfig;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import java.util.Scanner;
@SpringBootApplication
public class EncryptAndDecrypt {
public static void main(String[] args) {
SimpleStringPBEConfig simpleStringPBEConfig = new SimpleStringPBEConfig();
simpleStringPBEConfig.setPassword("yourKey");
simpleStringPBEConfig.setAlgorithm("PBEWITHSHA256AND256BITAES-CBC-BC"); // See below for what this algorithm means.
simpleStringPBEConfig.setKeyObtentionIterations("500");
simpleStringPBEConfig.setPoolSize("1");
simpleStringPBEConfig.setStringOutputType("base64");
simpleStringPBEConfig.setProviderClassName("org.bouncycastle.jce.provider.BouncyCastleProvider");
simpleStringPBEConfig.setProviderName("BC");
PooledPBEStringEncryptor pooledPBEStringEncryptor = new PooledPBEStringEncryptor();
pooledPBEStringEncryptor.setConfig(simpleStringPBEConfig);
Scanner userInput = new Scanner(System.in);
System.out.println("Press : E to Encrypt a text and hit Enter. ");
System.out.println();
System.out.println("Press : D to Decrypt a text and hit Enter. ");
System.out.println();
String encryptOrDecrypt = userInput.nextLine();
if (encryptOrDecrypt.equals("E")) {
System.out.println("Enter text that you want to encrypt below: ");
String textToEncrypt = userInput.nextLine();
System.out.println("Your Encrypted ENC() Text is: " + "ENC(" + pooledPBEStringEncryptor.encrypt(textToEncrypt) + ")");
} else if (encryptOrDecrypt.equals("D")) {
System.out.println("Enter text that you want to decrypt below: ");
String encryptedTextToDecrypt = userInput.nextLine();
if (encryptedTextToDecrypt.startsWith("ENC(")) {
try {
System.out.println("Your Decrypted ENC() Text is: " + pooledPBEStringEncryptor.decrypt(encryptedTextToDecrypt.substring(3, encryptedTextToDecrypt.length() - 1)));
} catch (Exception e) {
//Your custom exception
}
} else {
try {
System.out.println("Your Decrypted ENC() Text is: " + pooledPBEStringEncryptor.decrypt(encryptedTextToDecrypt));
} catch (Exception e) {
//Your custom exception
}
}
}
}
}

Dependency Used :
com.github.ulisesbocchio jasypt-spring-boot-starter 2.0.0
org.jasypt jasypt-spring4 1.9.3
org.bouncycastle bcpkix-jdk15on 1.64
Alright so above code and dependency should help you understand further.
Now briefly as promised above on the code comment I will explain what the Algorithm text stands for:
PBEWITHSHA256AND256BITAES-CBC-BC
PBE = Password-Based Encryption
WITHSHA256 = SHA-256 is a modern hash algorithm, and is used to demonstrate that the data can’t be modified by anyone with having the password at hand. 256-bit hashes are the up-to-date standard, with 512-bit hashes.
AND256BITAES = AES-256 is a modern encryption algorithm. The 256-bit key size is for those who want just a tiny bit extra guarantee, even however a 128-bit key size can be adequate for many practices.
CBC = The CBC mode for encryption is the default choice for turning a block cipher into a stream cipher.
BC = Crypto provider library aka BouncyCastle.
Once again there are other encryption methods and providers. Choose wisely based on your or project needs.