其實呢，都是自己不小心弄成的。寫個日記，算是提醒和自己一樣的朋友們被自己犯同樣的錯誤了。
因爲使用的是動態ActionForm.你就必須在原來<form-bean>裏面添加org.apache.struts.validator包裏面的API.即：把原來的：
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<form-beans >
<form-bean name="loginForm" type="com.login.struts.form.LoginForm" />
<form-bean name="registForm" type="org.apache.struts.action.DynaActionForm" dynamic="true">
<form-property name="username" type="java.lang.String" />
<form-property name="password1" type="java.lang.String" />
<form-property name="password2" type="java.lang.String" />
</form-bean>
</form-beans>
<action
attribute="registForm"
input="/regist.jsp"
name="registForm"
path="/regist"
scope="request"
validate="true"<!--rememer true-->
type="com.login.struts.action.RegistAction">
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改成：
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<form-beans >
<form-bean name="loginForm" type="com.login.struts.form.LoginForm" />
<form-bean name="registForm" type="org.apache.struts.validator.DynaValidatorForm">
<form-property name="username" type="java.lang.String" />
<form-property name="password1" type="java.lang.String" />
<form-property name="password2" type="java.lang.String" />
</form-bean>
</form-beans>
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同時也需要在XXXAction.java裏面導入這個包：
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.....
import org.apache.struts.validator.DynaValidatorForm;
public class RegistAction extends Action {
/*
* Generated Methods
*/
/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
* @throws Exception
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws Exception {
DynaValidatorForm dyform = (DynaValidatorForm)form;// TODO Auto-generated method stub
String username = (String)dyform.get("username");
String password1 = (String)dyform.get("password1");
String password2 = (String)dyform.get("password2");
........
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還需要在struts-config.xml添加struts插件
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<plug-in className="org.apache.struts.validator.ValidatorPlugIn">
<set-property
property="pathnames"
value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/>
<set-property property="stopOnFirstError" value="false"/>
</plug-in>
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如果還是不行的話，可以看看lib裏面添加了jakarta-ora.jar以及common-validator.jar兩個jar文件了沒有。如果沒有的話可以到網絡上下載http://commons.apache.org
