Struts2自学入门（八）——表单验证

表单：

<s:actionerror/>
用户注册
<s:form action="/registerAction" method="post">
<s:textfield name="user.userName" label="用户名"></s:textfield>
<s:textfield name="user.name" label="真实姓名"></s:textfield>
<s:textfield name="user.age" label="年龄"></s:textfield>
<s:textfield name="user.email" label="电子邮件"></s:textfield>
<s:textfield name="user.email" label="主页"></s:textfield>
<s:submit value="注册"></s:submit>
</s:form>

Struts.xml

<package name="manager" extends="struts-default">

<action name="registerAction" class="com.java1234.action.RegisterAction">
<result name="input">/register.jsp</result>
<result name="success">/success.jsp</result>
</action>

</package>

Action:
public class RegisterAction extends ActionSupport{

/**
*
*/
private static final long serialVersionUID = 1L;

private User user;

public User getUser() {
return user;
}

public void setUser(User user) {
this.user = user;
}

@Override
public String execute() throws Exception {
System.out.println("传入的用户："+user);
return SUCCESS;
}

}在Action的包下建立 RegisterAction-validation.xml：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.2//EN" "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">

<validators>
<field name="user.userName">
<field-validator type="requiredstring">
<message>请输入用户名</message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">6</param>
<param name="maxLength">10</param>
<message>用户名必须在${minLength}和${maxLength}之间</message>
</field-validator>
</field>
<field name="user.name">
<field-validator type="requiredstring">
<message>请输入姓名</message>
</field-validator>
</field>
<field name="user.age">
<field-validator type="int">
<param name="min">18</param>
<message>年龄必须满18周岁</message>
</field-validator>
</field>
<field name="user.email">
<field-validator type="requiredstring">
<message>请输入邮件</message>
</field-validator>
<field-validator type="email">
<message>邮件格式不对</message>
</field-validator>
</field>
<field name="user.homePage">
<field-validator type="requiredstring">
<message>请输入主页</message>
</field-validator>
<field-validator type="url">
<message>主页格式不对</message>
</field-validator>
</field>

<validator type="expression">
<param name="expression"><![CDATA[!user.name.equals(user.userName)]]></param>
<message>用户名和真实姓名不能相同</message>
</validator>
</validators>

最后一个为表达式验证, 输出到前端的<s:actionerror/>标签