Java Security

I have public key in xml format retrieved from a soap call like:

Public key =

<RSAKeyValue><Modulus>Tir6unMOaQ5tHqjjjwnlAMhccnCSMFEi3a0mhIxbW+O/GukjomGyzckQT2h0Ys70JezHbNq5YS3sYkNF29kCkz4HuNfy9eEjE/clA9/zyfT8ZcbnusLcLz2xNgbTp62fQdzBnReI5+dpj/N24krYvHaYIr8ACxDqBv2TR3E9M=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>

The c# code to encrypt the data is like this which does the job correclty.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
namespace ClassLibrary1
{
public class Class1
{
public static byte[] RSAEncrypt( )
{
string dataToEncrypt = "By35Jws8";

string publicKeyXMLString = "<RSAKeyValue><Modulus>+Tir6+unMOaQ5tHqjjjwnlAMhccnCSMFEi3a0mhIxbW+O/GukjomGyzckQT2h0Ys70JezHbNq5YS3sYkNF29kCkz4HuNfy9eEjE/clA9/zyfT8ZcbnusLcLz2xNgbTp62fQdzBnReI5+dpj/N24krYvHaYIr8ACxDqBv2TR3E9M=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";

try
{

//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter = new UnicodeEncoding();
byte[] encryptedData;
//Create a new instance of RSACryptoServiceProvider.

using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
{
RSA.FromXmlString(publicKeyXMLString);
encryptedData = RSA.Encrypt(ByteConverter.GetBytes(dataToEncrypt), false);
}

return encryptedData;
}

catch (CryptographicException e)
{

return null;

}

}

}
}

But I need to use java for some specific reason and i am new to java.

How can i achieve this is java, Could some one plase help me?