Base64 encoding in Java / Groovy
Solution 1
Apache Commons has many utilities:
Binary Package: http://commons.apache.org/codec/apidocs/org/apache/commons/codec/binary/Base64.html
Download: http://commons.apache.org/codec/download_codec.cgi
Solution 2
The preferred way to do this in groovy is:
def encoded = "Hello World".bytes.encodeBase64().toString()
assert encoded == "SGVsbG8gV29ybGQ="
def decoded = new String("SGVsbG8gV29ybGQ=".decodeBase64())
assert decoded == "Hello World"
Solution 3
You could use the open source Base64Coder library
import biz.source_code.base64Coder.Base64Coder
@Grab(group='biz.source_code', module='base64coder', version='2010-09-21')
String s1 = Base64Coder.encodeString("Hello world")
String s2 = Base64Coder.decodeString("SGVsbG8gd29ybGQ=")
Solution 4
Implement your own method like this :)
public class Coder {
private static final String base64code = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
public static String encodeAsBase64(String toEncode) {
return encodeAsBase64(toEncode.getBytes())
}
public static String encodeAsBase64(byte[] toEncode) {
int pos = 0;
int onhand = 0;
StringBuffer buffer = new StringBuffer();
for(byte b in toEncode) {
int read = b;
int m;
if(pos == 0) {
m = (read >> 2) & 63;
onhand = read & 3;
pos = 1;
} else if(pos == 1) {
m = (onhand << 4) + ((read >> 4) & 15);
onhand = read & 15;
pos = 2;
} else if(pos == 2) {
m = ((read >> 6) & 3) + (onhand << 2);
onhand = read & 63;
buffer.append(base64code.charAt(m));
m = onhand;
onhand = 0;
pos = 0;
}
buffer.append(base64code.charAt(m));
}
while(pos > 0 && pos < 4) {
pos++;
if(onhand == -1) {
buffer.append('=');
} else {
int m = pos == 2 ? onhand << 4 : (pos == 3 ? onhand << 2 : onhand);
onhand = -1;
buffer.append(base64code.charAt(m));
}
}
return buffer.toString()
}
}
Josh K
Me I'm a software engineer living in New York City. Currently I'm available for consulting work, previously I founded JAKT a leading design and development consultancy that uses technology to solve problems for entrepreneurs and corporations. You can read more about me at joshuakehn.com or @joshkehn. Common Links: Guidelines for Constructive Questions FAQ
Updated on January 15, 2020Comments
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Josh K over 4 years
What is the proper way to convert a byte [] to a Base64 string in Java? Better yet would be Grails / Groovy because it tells me that the
encodeAsBase64()
function is deprecated. Thesun.misc.BASE64Encoder
package isn't recommended for use and outputs a different size string on some Windows platforms.