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import java.security.*;  
import java.security.spec.*;  
 
class MD5_test {  
 public final static String MD5(String s) {  
  char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',  
    'a', 'b', 'c', 'd', 'e', 'f' };  
  try {  
   byte[] strTemp = s.getBytes();  
   MessageDigest mdTemp = MessageDigest.getInstance("MD5");  
   mdTemp.update(strTemp);  
   byte[] md = mdTemp.digest();  
   int j = md.length;  
   char str[] = new char[j * 2];  
   int k = 0;  
   for (int i = 0; i < j; i++) {  
    byte byte0 = md[i];  
    str[k++] = hexDigits[byte0 >>> 4 & 0xf];  
    str[k++] = hexDigits[byte0 & 0xf];  
   }  
   return new String(str);  
  } catch (Exception e) {  
   return null;  
  }  
 }  
 
 public static void main(String[] args) {  
  // MD5_Test aa = new MD5_Test();  
  System.out.print(MD5_test.MD5("b"));  
 }  
} 
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import java.security.MessageDigest;  
 
 
public class MD5andKL {  
 // MD5¼ÓÂë¡£32λ  
 public static String MD5(String inStr) {  
  MessageDigest md5 = null;  
  try {  
   md5 = MessageDigest.getInstance("MD5");  
  } catch (Exception e) {  
   System.out.println(e.toString());  
   e.printStackTrace();