StringTokenizer separater issue with special charecters

public class Tokenizer {

public static void main(String[] args) {

String longStr = "33068|~|Disa+bled|~|False==34296|~|Value|~|Yes";

String separator = "+";

StringTokenizer token = new StringTokenizer(longStr, separator);

String[] strList = longStr.split(separator);

for(int i=0; i < strList.length ; ++i)

{

System.out.println(strList[i]);

}

}

Hi ,

The above program is throwing an exeception because I am using '+' as delimeter . if we put '\\+' then it is working fine.

Problem is the separator is configurable and I don't know which data will come into this. Some times it may be one character and sometimes it may be

String which contains these meta characters. In those case I can't identify those and put \\ right… tell me is there any method to do this.

Solution :

"\\Q"+separator+"\\E";

If we use \\Q and \\E it will remove all the metacharacters in the string and it will take as it is…

$ in replacement text of string.

If you want to replace a part of the string with other string which consists a character $ in it, with normal replace/replaceAll will give error. To resolve it see following code.

String str = "asdf$fgh";
String str2 = "hghf-j-kjfi";
//Matcher m
str = str.replaceAll("\\$", "\\\\\\$");
str = str2.replaceAll("-j-", str);
System.out.println(str);

Password Based Encryption With MD5 and DES algorithms

package com.pavan.text.encryption;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
*
* @author pgupta
*
*/
public class PasswordTest {
//Predefined key for encryption and decryption.
public static final String key = "PaVaNkUmArGuPtA";

public static void main(String[] args) {
 PasswordTest pt = new PasswordTest();
 String encryptedString = pt.Encrypt("pgupta");
 System.out.println("encryptedString:    "+encryptedString);

 String decryptedString = pt.Decrypt(encryptedString);
 System.out.println("decryptedString:    "+decryptedString);
}

/**
 * Encrypts the given string using Password Based Encryption With MD5 and DES algorithm.
 * @param password
 * @return
 */
public String Encrypt(String password){
 PBEKeySpec pbeKeySpec;
    PBEParameterSpec pbeParamSpec;
    SecretKeyFactory keyFac;  
    // Salt
    byte[] salt = {
      (byte)0xc7, (byte)0x73, (byte)0x21, (byte)0x8c,
      (byte)0x7e, (byte)0xc8, (byte)0xee, (byte)0x99
      };  
    // Iteration count  
    int count = 20;  
    try {
    // Create PBE parameter set
    pbeParamSpec = new PBEParameterSpec(salt, count);
    pbeKeySpec = new PBEKeySpec(PasswordTest.key.toCharArray());  
    keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");  
    SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);  
    // Create PBE Cipher  
    Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");  
    // Initialize PBE Cipher with key and parameters  
    pbeCipher.init(Cipher.ENCRYPT_MODE, pbeKey, pbeParamSpec);  
    // Our cleartext  
    byte[] cleartext = password.getBytes();  
    // Encrypt the cleartext  
    byte[] encryptedPassword = pbeCipher.doFinal(cleartext);
    String hash = (new BASE64Encoder()).encode(encryptedPassword);
    return hash;

    } catch (Exception e) {

 }
    return null;
}

/**
 * Decrypts the given string using Password Based Decryption With MD5 and DES algorithm.
 * @param encryptedPassword
 * @return
 */
public String Decrypt(String encryptedPassword){
 try {
     PBEKeySpec pbeKeySpec;
     PBEParameterSpec pbeParamSpec;
     SecretKeyFactory keyFac;  
     // Salt
     byte[] salt = {
       (byte)0xc7, (byte)0x73, (byte)0x21, (byte)0x8c,
       (byte)0x7e, (byte)0xc8, (byte)0xee, (byte)0x99
       };  
     // Iteration count  
     int count = 20;  
     // Create PBE parameter set
     pbeParamSpec = new PBEParameterSpec(salt, count);
     pbeKeySpec = new PBEKeySpec(PasswordTest.key.toCharArray());  
     keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");  
     SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);  
     // Create PBE Cipher  
     Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");  
     // Initialize PBE Cipher with key and parameters  
     pbeCipher.init(Cipher.ENCRYPT_MODE, pbeKey, pbeParamSpec);  
  
     //decrypt
     pbeCipher.init(Cipher.DECRYPT_MODE, pbeKey, pbeParamSpec);
     byte hash[] = (new BASE64Decoder()).decodeBuffer(encryptedPassword);

     byte[] decryptPassword = pbeCipher.doFinal(hash);
     return new String(decryptPassword);
 } catch (Exception e) {

 }
 return null;
}


}

regular expression for file name comparision

"[0-9]+.*|.*[!,*,&,@,#,$,%,^,*, \\s].*"

How to access more than one resultset from jdbc storedprocedures

 
public List executeCallableStatement(CallableStatement colStmt) {
  ResultSet res = null;
  List result = null;
  List multiResult = new ArrayList();
  int count = 1;
  try {
   colStmt.execute();
   while (true) {
    res = colStmt.getResultSet();
    if (res != null){
     result = generateResultList(res);
     count ++;
    }
    if(count > 1){
     multiResult.add(result);
    }
    // Advance and quit if done
    if ((colStmt.getMoreResults() == false)
         && (colStmt.getUpdateCount() == -1))
    {
     if (count == 2) 
     {
      multiResult = result;      
     }
     break;
    }
   }
  } catch (SQLException e) {
   e.printStackTrace();
  }

  return multiResult;
 }

   /**
     * Genarates ArrayList for given result set.
     * @param res
     * @return
     */
    private List generateResultList(ResultSet res){
  Hashtable hashTab = null;
  List resultList = new ArrayList();
  try {
   if (res != null) {
    ResultSetMetaData rsm = res.getMetaData();
    int columnCount = rsm.getColumnCount();
    while (res.next()) {
     hashTab = new Hashtable();
     for (int i = 1; i <= columnCount; i++) {
      String columnName = rsm.getColumnName(i);
      if (rsm.getColumnType(i) == Types.VARCHAR)
       hashTab.put(columnName, res.getString(columnName));
      else if (rsm.getColumnType(i) == Types.INTEGER)
       hashTab.put(columnName, new Integer(res
         .getInt(columnName)));
      else if (rsm.getColumnType(i) == Types.TIMESTAMP)
       hashTab.put(columnName, res
         .getTimestamp(columnName));
      else if (rsm.getColumnType(i) == Types.DECIMAL)
       hashTab.put(columnName, new Float(res
         .getFloat(columnName)));
     }
     resultList.add(hashTab);
    }
   }else{
    return null;
   }
  } catch (SQLException e) {
   e.printStackTrace();
  }

 return resultList;
    }