UrlValidator (Apache Commons Validator 1.6 API)

java.lang.Object
- org.apache.commons.validator.routines.UrlValidator

All Implemented Interfaces:

java.io.Serializable
```
public class UrlValidator
extends java.lang.Object
implements java.io.Serializable
```
URL Validation routines.
Behavior of validation is modified by passing in options:
- ALLOW_2_SLASHES - [FALSE] Allows double '/' characters in the path component.
- NO_FRAGMENT- [FALSE] By default fragments are allowed, if this option is included then fragments are flagged as illegal.
- ALLOW_ALL_SCHEMES - [FALSE] By default only http, https, and ftp are considered valid schemes. Enabling this option will let any scheme pass validation.
Originally based in on php script by Debbie Dyer, validation.php v1.2b, Date: 03/07/02, http://javascript.internet.com. However, this validation now bears little resemblance to the php original.
```
   Example of usage:
   Construct a UrlValidator with valid schemes of "http", and "https".

    String[] schemes = {"http","https"}.
    UrlValidator urlValidator = new UrlValidator(schemes);
    if (urlValidator.isValid("ftp://foo.bar.com/")) {
       System.out.println("url is valid");
    } else {
       System.out.println("url is invalid");
    }

    prints "url is invalid"
   If instead the default constructor is used.

    UrlValidator urlValidator = new UrlValidator();
    if (urlValidator.isValid("ftp://foo.bar.com/")) {
       System.out.println("url is valid");
    } else {
       System.out.println("url is invalid");
    }

   prints out "url is valid"
  
```
Since:

Validator 1.4

Version:

$Revision: 1783203 $

See Also:

Uniform Resource Identifiers (URI): Generic Syntax , Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`static long`	`ALLOW_2_SLASHES`	Allow two slashes in the path component of the URL.
`static long`	`ALLOW_ALL_SCHEMES`	Allows all validly formatted schemes to pass validation instead of supplying a set of valid schemes.
`static long`	`ALLOW_LOCAL_URLS`	Allow local URLs, such as http://localhost/ or http://machine/ .
`static long`	`NO_FRAGMENTS`	Enabling this options disallows any URL fragments.

Constructor Summary

Constructors
Constructor	Description
`UrlValidator()`	Create a UrlValidator with default properties.
`UrlValidator(long options)`	Initialize a UrlValidator with the given validation options.
`UrlValidator(java.lang.String[] schemes)`	Behavior of validation is modified by passing in several strings options:
`UrlValidator(java.lang.String[] schemes, long options)`	Behavior of validation is modified by passing in options:
`UrlValidator(java.lang.String[] schemes, RegexValidator authorityValidator, long options)`	Customizable constructor.
`UrlValidator(RegexValidator authorityValidator, long options)`	Initialize a UrlValidator with the given validation options.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected int`	`countToken(java.lang.String token, java.lang.String target)`	Returns the number of times the token appears in the target.
`static UrlValidator`	`getInstance()`	Returns the singleton instance of this class with default schemes and options.
`boolean`	`isValid(java.lang.String value)`	Checks if a field has a valid url address.
`protected boolean`	`isValidAuthority(java.lang.String authority)`	Returns true if the authority is properly formatted.
`protected boolean`	`isValidFragment(java.lang.String fragment)`	Returns true if the given fragment is null or fragments are allowed.
`protected boolean`	`isValidPath(java.lang.String path)`	Returns true if the path is valid.
`protected boolean`	`isValidQuery(java.lang.String query)`	Returns true if the query is null or it's a properly formatted query string.
`protected boolean`	`isValidScheme(java.lang.String scheme)`	Validate scheme.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - ALLOW_ALL_SCHEMES
```
public static final long ALLOW_ALL_SCHEMES
```
    Allows all validly formatted schemes to pass validation instead of supplying a set of valid schemes.
    
    See Also:
    
    Constant Field Values
  - ALLOW_2_SLASHES
```
public static final long ALLOW_2_SLASHES
```
    Allow two slashes in the path component of the URL.
    
    See Also:
    
    Constant Field Values
  - NO_FRAGMENTS
```
public static final long NO_FRAGMENTS
```
    Enabling this options disallows any URL fragments.
    
    See Also:
    
    Constant Field Values
  - ALLOW_LOCAL_URLS
```
public static final long ALLOW_LOCAL_URLS
```
    Allow local URLs, such as http://localhost/ or http://machine/ . This enables a broad-brush check, for complex local machine name validation requirements you should create your validator with a RegexValidator instead (UrlValidator(RegexValidator, long))
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - UrlValidator
```
public UrlValidator()
```
    Create a UrlValidator with default properties.
  - UrlValidator
```
public UrlValidator(java.lang.String[] schemes)
```
    Behavior of validation is modified by passing in several strings options:
    
    Parameters:
    
    schemes - Pass in one or more url schemes to consider valid, passing in a null will default to "http,https,ftp" being valid. If a non-null schemes is specified then all valid schemes must be specified. Setting the ALLOW_ALL_SCHEMES option will ignore the contents of schemes.
  - UrlValidator
```
public UrlValidator(long options)
```
    Initialize a UrlValidator with the given validation options.
    
    Parameters:
    
    options - The options should be set using the public constants declared in this class. To set multiple options you simply add them together. For example, ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
  - UrlValidator
```
public UrlValidator(java.lang.String[] schemes,
                    long options)
```
    Behavior of validation is modified by passing in options:
    
    Parameters:
    
    schemes - The set of valid schemes. Ignored if the ALLOW_ALL_SCHEMES option is set.
    
    options - The options should be set using the public constants declared in this class. To set multiple options you simply add them together. For example, ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
  - UrlValidator
```
public UrlValidator(RegexValidator authorityValidator,
                    long options)
```
    Initialize a UrlValidator with the given validation options.
    
    Parameters:
    
    authorityValidator - Regular expression validator used to validate the authority part This allows the user to override the standard set of domains.
    
    options - Validation options. Set using the public constants of this class. To set multiple options, simply add them together:
    ALLOW_2_SLASHES + NO_FRAGMENTS
    enables both of those options.
  - UrlValidator
```
public UrlValidator(java.lang.String[] schemes,
                    RegexValidator authorityValidator,
                    long options)
```
    Customizable constructor. Validation behavior is modifed by passing in options.
    
    Parameters:
    
    schemes - the set of valid schemes. Ignored if the ALLOW_ALL_SCHEMES option is set.
    
    authorityValidator - Regular expression validator used to validate the authority part
    
    options - Validation options. Set using the public constants of this class. To set multiple options, simply add them together:
    ALLOW_2_SLASHES + NO_FRAGMENTS
    enables both of those options.
- Method Detail
  - getInstance
```
public static UrlValidator getInstance()
```
    Returns the singleton instance of this class with default schemes and options.
    
    Returns:
    
    singleton instance with default schemes and options
  - isValid
```
public boolean isValid(java.lang.String value)
```
    Checks if a field has a valid url address.
    Note that the method calls #isValidAuthority() which checks that the domain is valid.
    
    Parameters:
    
    value - The value validation is being performed on. A null value is considered invalid.
    
    Returns:
    
    true if the url is valid.
  - isValidScheme
```
protected boolean isValidScheme(java.lang.String scheme)
```
    Validate scheme. If schemes[] was initialized to a non null, then only those schemes are allowed. Otherwise the default schemes are "http", "https", "ftp". Matching is case-blind.
    
    Parameters:
    
    scheme - The scheme to validate. A null value is considered invalid.
    
    Returns:
    
    true if valid.
  - isValidAuthority
```
protected boolean isValidAuthority(java.lang.String authority)
```
    Returns true if the authority is properly formatted. An authority is the combination of hostname and port. A null authority value is considered invalid. Note: this implementation validates the domain unless a RegexValidator was provided. If a RegexValidator was supplied and it matches, then the authority is regarded as valid with no further checks, otherwise the method checks against the AUTHORITY_PATTERN and the DomainValidator (ALLOW_LOCAL_URLS)
    
    Parameters:
    
    authority - Authority value to validate, alllows IDN
    
    Returns:
    
    true if authority (hostname and port) is valid.
  - isValidPath
```
protected boolean isValidPath(java.lang.String path)
```
    Returns true if the path is valid. A null value is considered invalid.
    
    Parameters:
    
    path - Path value to validate.
    
    Returns:
    
    true if path is valid.
  - isValidQuery
```
protected boolean isValidQuery(java.lang.String query)
```
    Returns true if the query is null or it's a properly formatted query string.
    
    Parameters:
    
    query - Query value to validate.
    
    Returns:
    
    true if query is valid.
  - isValidFragment
```
protected boolean isValidFragment(java.lang.String fragment)
```
    Returns true if the given fragment is null or fragments are allowed.
    
    Parameters:
    
    fragment - Fragment value to validate.
    
    Returns:
    
    true if fragment is valid.
  - countToken
```
protected int countToken(java.lang.String token,
                         java.lang.String target)
```
    Returns the number of times the token appears in the target.
    
    Parameters:
    
    token - Token value to be counted.
    
    target - Target value to count tokens in.
    
    Returns:
    
    the number of tokens.

Class UrlValidator

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ALLOW_ALL_SCHEMES

ALLOW_2_SLASHES

NO_FRAGMENTS

ALLOW_LOCAL_URLS

Constructor Detail

UrlValidator

UrlValidator

UrlValidator

UrlValidator

UrlValidator

UrlValidator

Method Detail

getInstance

isValid

isValidScheme

isValidAuthority

isValidPath

isValidQuery

isValidFragment

countToken