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<a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/core-developers/using-field-validators.md" title="Edit this page on GitHub">Edit on GitHub</a>
<a href="validation.html" title="back to Validation"><< back to Validation</a>
<h1 class="no_toc" id="using-field-validators">Using Field Validators</h1>
<ul id="markdown-toc">
<li><a href="#description" id="markdown-toc-description">Description</a> <ul>
<li><a href="#step-1" id="markdown-toc-step-1">Step 1</a></li>
<li><a href="#step-2" id="markdown-toc-step-2">Step 2</a></li>
<li><a href="#step-3" id="markdown-toc-step-3">Step 3</a></li>
</ul>
</li>
</ul>
<h2 id="description">Description</h2>
<p>The followings show a simple example using Struts’ Field Validators</p>
<h3 id="step-1">Step 1</h3>
<p>Create the jsp page</p>
<div class="language-html highlighter-rouge"><div class="highlight"><pre class="highlight"><code>
<span class="nt">&lt;h3&gt;</span>All Field Errors Will Appear Here<span class="nt">&lt;/h3&gt;</span>
<span class="nt">&lt;s:fielderror/&gt;</span>
<span class="nt">&lt;hr/&gt;</span>
<span class="nt">&lt;h3&gt;</span>Field Error due to 'Required String Validator Field' Will Appear Here<span class="nt">&lt;/h3&gt;</span>
<span class="nt">&lt;s:fielderror&gt;</span>
<span class="nt">&lt;s:param</span> <span class="na">value=</span><span class="s">"%{'requiredStringValidatorField'}"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/s:fielderror&gt;</span>
<span class="nt">&lt;hr/&gt;</span>
<span class="nt">&lt;h3&gt;</span>Field Error due to 'String Length Validator Field' Will Appear Here<span class="nt">&lt;/h3&gt;</span>
<span class="nt">&lt;s:fielderror&gt;</span>
<span class="nt">&lt;s:param&gt;</span>stringLengthValidatorField<span class="nt">&lt;/s:param&gt;</span>
<span class="nt">&lt;/s:fielderror&gt;</span>
<span class="nt">&lt;hr/&gt;</span>
<span class="nt">&lt;s:form</span> <span class="na">action=</span><span class="s">"submitFieldValidatorsExamples"</span> <span class="na">namespace=</span><span class="s">"/validation"</span> <span class="na">method=</span><span class="s">"POST"</span> <span class="na">theme=</span><span class="s">"xhtml"</span><span class="nt">&gt;</span>
<span class="nt">&lt;s:textfield</span> <span class="na">label=</span><span class="s">"Required Validator Field"</span> <span class="na">name=</span><span class="s">"requiredValidatorField"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:textfield</span> <span class="na">label=</span><span class="s">"Required String Validator Field"</span> <span class="na">name=</span><span class="s">"requiredStringValidatorField"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:textfield</span> <span class="na">label=</span><span class="s">"Integer Validator Field"</span> <span class="na">name=</span><span class="s">"integerValidatorField"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:textfield</span> <span class="na">label=</span><span class="s">"Date Validator Field"</span> <span class="na">name=</span><span class="s">"dateValidatorField"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:textfield</span> <span class="na">label=</span><span class="s">"Email Validator Field"</span> <span class="na">name=</span><span class="s">"emailValidatorField"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:textfield</span> <span class="na">label=</span><span class="s">"URL Validator Field"</span> <span class="na">name=</span><span class="s">"urlValidatorField"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:textfield</span> <span class="na">label=</span><span class="s">"String Length Validator Field"</span> <span class="na">name=</span><span class="s">"stringLengthValidatorField"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:textfield</span> <span class="na">label=</span><span class="s">"Regex Validator Field"</span> <span class="na">name=</span><span class="s">"regexValidatorField"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:textfield</span> <span class="na">label=</span><span class="s">"Field Expression Validator Field"</span> <span class="na">name=</span><span class="s">"fieldExpressionValidatorField"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:submit</span> <span class="na">label=</span><span class="s">"Submit"</span> <span class="na">cssClass=</span><span class="s">"btn btn-primary"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/s:form&gt;</span>
</code></pre></div></div>
<h3 id="step-2">Step 2</h3>
<p>Create the action class</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">class</span> <span class="nc">FieldValidatorsExampleAction</span> <span class="kd">extends</span> <span class="n">AbstractValidationActionSupport</span> <span class="o">{</span>
<span class="kd">private</span> <span class="n">String</span> <span class="n">requiredValidatorField</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="kd">private</span> <span class="n">String</span> <span class="n">requiredStringValidatorField</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="kd">private</span> <span class="n">Integer</span> <span class="n">integerValidatorField</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="kd">private</span> <span class="n">Date</span> <span class="n">dateValidatorField</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="kd">private</span> <span class="n">String</span> <span class="n">emailValidatorField</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="kd">private</span> <span class="n">String</span> <span class="n">urlValidatorField</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="kd">private</span> <span class="n">String</span> <span class="n">stringLengthValidatorField</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="kd">private</span> <span class="n">String</span> <span class="n">regexValidatorField</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="kd">private</span> <span class="n">String</span> <span class="n">fieldExpressionValidatorField</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="kd">public</span> <span class="n">Date</span> <span class="nf">getDateValidatorField</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">dateValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setDateValidatorField</span><span class="o">(</span><span class="n">Date</span> <span class="n">dateValidatorField</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">dateValidatorField</span> <span class="o">=</span> <span class="n">dateValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="n">String</span> <span class="nf">getEmailValidatorField</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">emailValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setEmailValidatorField</span><span class="o">(</span><span class="n">String</span> <span class="n">emailValidatorField</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">emailValidatorField</span> <span class="o">=</span> <span class="n">emailValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="n">Integer</span> <span class="nf">getIntegerValidatorField</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">integerValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setIntegerValidatorField</span><span class="o">(</span><span class="n">Integer</span> <span class="n">integerValidatorField</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">integerValidatorField</span> <span class="o">=</span> <span class="n">integerValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="n">String</span> <span class="nf">getRegexValidatorField</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">regexValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setRegexValidatorField</span><span class="o">(</span><span class="n">String</span> <span class="n">regexValidatorField</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">regexValidatorField</span> <span class="o">=</span> <span class="n">regexValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="n">String</span> <span class="nf">getRequiredStringValidatorField</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">requiredStringValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setRequiredStringValidatorField</span><span class="o">(</span><span class="n">String</span> <span class="n">requiredStringValidatorField</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">requiredStringValidatorField</span> <span class="o">=</span> <span class="n">requiredStringValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="n">String</span> <span class="nf">getRequiredValidatorField</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">requiredValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setRequiredValidatorField</span><span class="o">(</span><span class="n">String</span> <span class="n">requiredValidatorField</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">requiredValidatorField</span> <span class="o">=</span> <span class="n">requiredValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="n">String</span> <span class="nf">getStringLengthValidatorField</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">stringLengthValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setStringLengthValidatorField</span><span class="o">(</span><span class="n">String</span> <span class="n">stringLengthValidatorField</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">stringLengthValidatorField</span> <span class="o">=</span> <span class="n">stringLengthValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="n">String</span> <span class="nf">getFieldExpressionValidatorField</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">fieldExpressionValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setFieldExpressionValidatorField</span><span class="o">(</span>
<span class="n">String</span> <span class="n">fieldExpressionValidatorField</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">fieldExpressionValidatorField</span> <span class="o">=</span> <span class="n">fieldExpressionValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="n">String</span> <span class="nf">getUrlValidatorField</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">urlValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setUrlValidatorField</span><span class="o">(</span><span class="n">String</span> <span class="n">urlValidatorField</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">urlValidatorField</span> <span class="o">=</span> <span class="n">urlValidatorField</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<h3 id="step-3">Step 3</h3>
<p>Create the <code class="highlighter-rouge">validator.xml</code>.</p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;validators&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"requiredValidatorField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"required"</span><span class="nt">&gt;</span>
<span class="nt">&lt;message&gt;</span><span class="cp">&lt;![CDATA[ required ]]&gt;</span><span class="nt">&lt;/message&gt;</span>
<span class="nt">&lt;/field-validator&gt;</span>
<span class="nt">&lt;/field&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"requiredStringValidatorField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"requiredstring"</span><span class="nt">&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"trim"</span><span class="nt">&gt;</span>true<span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;message&gt;</span><span class="cp">&lt;![CDATA[ required and must be string ]]&gt;</span><span class="nt">&lt;/message&gt;</span>
<span class="nt">&lt;/field-validator&gt;</span>
<span class="nt">&lt;/field&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"integerValidatorField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"int"</span><span class="nt">&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"min"</span><span class="nt">&gt;</span>1<span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"max"</span><span class="nt">&gt;</span>10<span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;message&gt;</span><span class="cp">&lt;![CDATA[ must be integer min 1 max 10 if supplied ]]&gt;</span><span class="nt">&lt;/message&gt;</span>
<span class="nt">&lt;/field-validator&gt;</span>
<span class="nt">&lt;/field&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"dateValidatorField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"date"</span><span class="nt">&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"min"</span><span class="nt">&gt;</span>01/01/1990<span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"max"</span><span class="nt">&gt;</span>01/01/2000<span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;message&gt;</span><span class="cp">&lt;![CDATA[ must be a min 01-01-1990 max 01-01-2000 if supplied ]]&gt;</span><span class="nt">&lt;/message&gt;</span>
<span class="nt">&lt;/field-validator&gt;</span>
<span class="nt">&lt;/field&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"emailValidatorField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"email"</span><span class="nt">&gt;</span>
<span class="nt">&lt;message&gt;</span><span class="cp">&lt;![CDATA[ must be a valid email if supplied ]]&gt;</span><span class="nt">&lt;/message&gt;</span>
<span class="nt">&lt;/field-validator&gt;</span>
<span class="nt">&lt;/field&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"urlValidatorField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"url"</span><span class="nt">&gt;</span>
<span class="nt">&lt;message&gt;</span><span class="cp">&lt;![CDATA[ must be a valid url if supplied ]]&gt;</span><span class="nt">&lt;/message&gt;</span>
<span class="nt">&lt;/field-validator&gt;</span>
<span class="nt">&lt;/field&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"stringLengthValidatorField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"stringlength"</span><span class="nt">&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"maxLength"</span><span class="nt">&gt;</span>4<span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"minLength"</span><span class="nt">&gt;</span>2<span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"trim"</span><span class="nt">&gt;</span>true<span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;message&gt;</span><span class="cp">&lt;![CDATA[ must be a String of a specific greater than 1 less than 5 if specified ]]&gt;</span><span class="nt">&lt;/message&gt;</span>
<span class="nt">&lt;/field-validator&gt;</span>
<span class="nt">&lt;/field&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"regexValidatorField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"regex"</span><span class="nt">&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"regex"</span><span class="nt">&gt;</span><span class="cp">&lt;![CDATA[ [^&lt;&gt;]+ ]]&gt;</span><span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;message&gt;</span><span class="cp">&lt;![CDATA[ regexValidatorField must match a regexp (.*.txt) if specified ]]&gt;</span><span class="nt">&lt;/message&gt;</span>
<span class="nt">&lt;/field-validator&gt;</span>
<span class="nt">&lt;/field&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"fieldExpressionValidatorField"</span><span class="nt">&gt;</span>
<span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"fieldexpression"</span><span class="nt">&gt;</span>
<span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"expression"</span><span class="nt">&gt;</span>(fieldExpressionValidatorField == requiredValidatorField)<span class="nt">&lt;/param&gt;</span>
<span class="nt">&lt;message&gt;</span><span class="cp">&lt;![CDATA[ must be the same as the Required Validator Field if specified ]]&gt;</span><span class="nt">&lt;/message&gt;</span>
<span class="nt">&lt;/field-validator&gt;</span>
<span class="nt">&lt;/field&gt;</span>
<span class="nt">&lt;/validators&gt;</span>
</code></pre></div></div>
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