android典型代码系列(八)------传递一个String进行MD5编码

package cn.itcast.antivirus;
public class MD5Encoder {
public static String encode(String pwd) {
try {
MessageDigest  digest = MessageDigest.getInstance("MD5");
byte[]  bytes = digest.digest(pwd.getBytes());
StringBuffer sb = new  StringBuffer();
for(int i = 0;i<bytes.length;i++){
String s = Integer.toHexString(0xff&bytes[i]);
if(s.length()==1){
sb.append("0"+s);
}else{
sb.append(s);
}
}
return sb.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
throw new RuntimeException("buhuifasheng");
}
}
}