Java MD5

  总是忘了怎么用,这次写下来,

  留着以后自己用。。。

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public final class AppMD5 {
        
    public static final String TYPE_MD5 = "MD5";
	
	public static String getMD5(final String text) throws NoSuchAlgorithmException, UnsupportedEncodingException {
		
		if (text == null || text.equals("")) {
			throw new IllegalArgumentException("Parameter text is empty or null!");
		}
		
		MessageDigest md = MessageDigest.getInstance(TYPE_MD5);
		byte[] bytes = md.digest(text.getBytes("UTF-8"));
		
		StringBuffer buf = new StringBuffer();
		for (byte b : bytes) {
			int n = b & 0xFF;
			String s = Integer.toHexString(n);
			buf.append(n > 15 ? s : "0" + s);
		}
		return buf.toString().toUpperCase();
	}
}