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Apache Commons Validator provides the building blocks for both client side validation and server side data validation.
It may be used standalone or with a framework like Struts.
/*
* 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.
*/
package org.apache.commons.validator.routines;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* InetAddress validation and conversion routines (java.net.InetAddress).
*
* This class provides methods to validate a candidate IP address.
*
*
* This class is a Singleton; you can retrieve the instance via the {@link #getInstance()} method.
*
*
* @version $Revision: 1651811 $
* @since Validator 1.4
*/
public class InetAddressValidator implements Serializable {
private static final long serialVersionUID = -919201640201914789L;
private static final String IPV4_REGEX =
"^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$";
/**
* Singleton instance of this class.
*/
private static final InetAddressValidator VALIDATOR = new InetAddressValidator();
/** IPv4 RegexValidator */
private final RegexValidator ipv4Validator = new RegexValidator(IPV4_REGEX);
/**
* Returns the singleton instance of this validator.
* @return the singleton instance of this validator
*/
public static InetAddressValidator getInstance() {
return VALIDATOR;
}
/**
* Checks if the specified string is a valid IP address.
* @param inetAddress the string to validate
* @return true if the string validates as an IP address
*/
public boolean isValid(String inetAddress) {
return isValidInet4Address(inetAddress) || isValidInet6Address(inetAddress);
}
/**
* Validates an IPv4 address. Returns true if valid.
* @param inet4Address the IPv4 address to validate
* @return true if the argument contains a valid IPv4 address
*/
public boolean isValidInet4Address(String inet4Address) {
// verify that address conforms to generic IPv4 format
String[] groups = ipv4Validator.match(inet4Address);
if (groups == null) {
return false;
}
// verify that address subgroups are legal
for (int i = 0; i <= 3; i++) {
String ipSegment = groups[i];
if (ipSegment == null || ipSegment.length() == 0) {
return false;
}
int iIpSegment = 0;
try {
iIpSegment = Integer.parseInt(ipSegment);
} catch(NumberFormatException e) {
return false;
}
if (iIpSegment > 255) {
return false;
}
if (ipSegment.length() > 1 && ipSegment.startsWith("0")) {
return false;
}
}
return true;
}
/**
* Validates an IPv6 address. Returns true if valid.
* @param inet6Address the IPv6 address to validate
* @return true if the argument contains a valid IPv6 address
*
* @since 1.4.1
*/
public boolean isValidInet6Address(String inet6Address) {
boolean containsCompressedZeroes = inet6Address.contains("::");
if (containsCompressedZeroes && (inet6Address.indexOf("::") != inet6Address.lastIndexOf("::"))) {
return false;
}
if ((inet6Address.startsWith(":") && !inet6Address.startsWith("::"))
|| (inet6Address.endsWith(":") && !inet6Address.endsWith("::"))) {
return false;
}
String[] octets = inet6Address.split(":");
if (containsCompressedZeroes) {
List octetList = new ArrayList(Arrays.asList(octets));
if (inet6Address.endsWith("::")) {
// String.split() drops ending empty segments
octetList.add("");
} else if (inet6Address.startsWith("::") && !octetList.isEmpty()) {
octetList.remove(0);
}
octets = octetList.toArray(new String[octetList.size()]);
}
if (octets.length > 8) {
return false;
}
int validOctets = 0;
int emptyOctets = 0;
for (int index = 0; index < octets.length; index++) {
String octet = (String) octets[index];
if (octet.length() == 0) {
emptyOctets++;
if (emptyOctets > 1) {
return false;
}
} else {
emptyOctets = 0;
if (octet.contains(".")) { // contains is Java 1.5+
if (!inet6Address.endsWith(octet)) {
return false;
}
if (index > octets.length - 1 || index > 6) {
// IPV4 occupies last two octets
return false;
}
if (!isValidInet4Address(octet)) {
return false;
}
validOctets += 2;
continue;
}
if (octet.length() > 4) {
return false;
}
int octetInt = 0;
try {
octetInt = Integer.valueOf(octet, 16).intValue();
} catch (NumberFormatException e) {
return false;
}
if (octetInt < 0 || octetInt > 0xffff) {
return false;
}
}
validOctets++;
}
if (validOctets < 8 && !containsCompressedZeroes) {
return false;
}
return true;
}
}