数据加密MD5_02

 import java.security.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class md5{
    public String md5(String str) {
        String s=str;
	if(s==null){
		return "";
	}else{
		String value = null;
		MessageDigest md5 = null;
		try {
			md5 = MessageDigest.getInstance("MD5");
			}catch (NoSuchAlgorithmException ex) {
				Logger.getLogger(md5.class.getName()).log(Level.SEVERE, null, ex);
				}
		sun.misc.BASE64Encoder baseEncoder = new sun.misc.BASE64Encoder();
		try {
			value = baseEncoder.encode(md5.digest(s.getBytes("utf-8")));
			} catch (Exception ex) {
			}
		return value;
		}
	}      
}