Basic Validation

Let's configure a basic validation workflow, step by step.

Step 1

Create the input form.

<html>
<head>
    <title>Validation - Basic</title>
    <s:head/>
</head>

<body>

<b>What is your favorite color?</b>
<p/>

<s:form method="post">
    <s:textfield label="Name" name="name"/>
    <s:textfield label="Age" name="age"/>
    <s:textfield label="Favorite color" name="answer"/>
    <s:submit/>
</s:form>

</body>
</html>

Step 2

Create the Action class.

public class QuizAction extends ActionSupport {

    private static final long serialVersionUID = -7505437345373234225L;

    String name;
    int age;
    String answer;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAnswer() {
        return answer;
    }

    public void setAnswer(String answer) {
        this.answer = answer;
    }
}

Step 3

Create the validators. The validation.xml format is either <ActionClassName>-validation.xml or <ActionClassName>-<ActionAliasName>-validation.xml.

<!--
    Add the following DOCTYPE declaration as first line of your XXX-validation.xml file:
    <!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0.2//EN" "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
-->
<validators>
    <field name="name">
        <field-validator type="requiredstring">
            <message>You must enter a name</message>
        </field-validator>
    </field>
    <field name="age">
        <field-validator type="int">
            <param name="min">13</param>
            <param name="max">19</param>
            <message>Only people ages 13 to 19 may take this quiz</message>
        </field-validator>
    </field>
</validators>

Step 4

Make sure there is a result for "input" listed in the struts.xml for when the validation fails:

<action name="HelloWorld" class="tutorial.HelloWorld">
<result name="success">/tutorial/createconfirm.jsp</result>
<result name="error">/tutorial/error.jsp</result>
<result name="input">/tutorial/create.jsp</result>
</action>

If you don't have this, you'll get a: "No result defined for action xxx.xxx.tutorial.HellowWorld and result input" error