Byte Array | Tech Tips Tricks

Encode Decode Byte Array To Base64 String Using Java

Posted by tech on

November 11, 2009

(4 votes, average: 5.00 out of 5)

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The code uses non standard classes found in the sun.misc package to convert to and from Base64. These classes may change in the future. Taken from Example Depot.

^?View Code JAVA

 // Convert a byte array to base64 string
byte[] buf = new byte[]{0x12, 0x23};
String s = new sun.misc.BASE64Encoder().encode(buf);
 
// Convert base64 string to a byte array
buf = new sun.misc.BASE64Decoder().decodeBuffer(s);

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tags: base64, byte array, java

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Java: Convert Stream To Byte[]

Posted by tech on

October 12, 2009

(2 votes, average: 5.00 out of 5)

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Say you call an HTTP request that returns a byte array which contains a binary file, how would you do this? First things first. Access it using an HttpURLConnection object. Once you have connected to the URL, get the InputStream object and that is when you will be able to convert the stream into a byte array. Check the code below.

^?View Code JAVA

URL u = new URL("MY URL");
HttpURLConnection uc = (HttpURLConnection) u.openConnection();
String contentType = uc.getContentType();
int contentLength = uc.getContentLength();
if (contentType.startsWith("text/") || contentLength == -1) {
    throw new IOException("This is not a binary file.");
}
InputStream raw = uc.getInputStream();
InputStream in = new BufferedInputStream(raw);
byte[] data = new byte[contentLength];
int bytesRead = 0;
int offset = 0;
while (offset < contentLength) {
    bytesRead = in.read(data, offset, data.length - offset);
    if (bytesRead == -1) break;
    offset += bytesRead;
}
in.close();

The data variable is the byte array. You can then do whatever you like (e.g. saving it as a binary file) after you have retrieved the byte array object.

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