Given a hexstring this will return the byte array corresponding to string

      
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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.StringTokenizer;
import java.util.Collection;


/**
 * General string utils
 */
public class StringUtils {

  final public static char COMMA = ',';
  final public static String COMMA_STR = ",";
  final public static char ESCAPE_CHAR = '\\';
  private static DecimalFormat oneDecimal = new DecimalFormat("0.0");
  
  /**
   * Given a hexstring this will return the byte array corresponding to the
   * string
   * @param hex the hex String array
   * @return a byte array that is a hex string representation of the given
   *         string. The size of the byte array is therefore hex.length/2
   */
  public static byte[] hexStringToByte(String hex) {
    byte[] bts = new byte[hex.length() / 2];
    for (int i = 0; i < bts.length; i++) {
      bts[i] = (byte) Integer.parseInt(hex.substring(2 * i, 2 * i + 2), 16);
    }
    return bts;
  }
}

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Given a hexstring this will return the byte array corresponding to string : Byte Array « File Input Output « Java

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