本文将带你了解WEBAPP开发教程应用struts的validator验证的一个简单实例，希望本文对大家学WEBAPP有所帮助。

 我使用的IDE是Netbeans，用Eclipse开发步骤差不多，先新建Web工程，工程名为WebApp，配置目录结构如下
    WebApp/src/com/action/UserAction.java WebApp/src/com/formbean/UserForm.java   WebApp/web/index.jsp  //登陆页面WebApp/web/WEB-INF/struts-config.xml   WebApp/web/WEB-INF/web.xml  WebApp/web/WEB-INF/validation.xml   WebApp/web/WEB-INF/lib/classes/MeaasgeResources.properties   struts1.3.8相关的jar文件放在目录WebApp/web/WEB-INF/lib/
    通过validator验证输入的表单是否为空，若为空，则显示 ** is required.的信息各文件代码如下：
    ==============UserForm===========
    package com.formbean
    import org.apache.struts.validator.ValidatorForm;
    public class UserForm extends ValidatorForm{
        private String name;
        private String password;
     
        public String getName(){
            return name;
        }
     
        public void setName(String name){
            this.name = name;
        }
     
        public String getPassword(){
            return password;
        }
     
        public void   setPassword(){        this.password =   password;
        }
    }
    ==============UserAction.java================== package com.action; import   javax.servlet.http.HttpServletRequest; import   javax.servlet.http.HttpServletResponse; import   org.apache.struts.action.Action; import org.apache.struts.action.ActionForm;   import org.apache.struts.action.ActionMapping; import   org.apache.struts.action.ActionForward; import   org.apache.struts.action.ActionErrors; import   org.apache.struts.action.ActionMessage; import   org.apache.struts.action.ActionMessages; import   org.apache.struts.actions.DispatchAction; import com.formbean.UserForm;   public class UserAction extends Action{ public ActionForward   execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,   HttpServletResponse response){ return   mapping.findForward("index");  //不进行任何处理，只简单地把页面转发回index.jsp}   }
    =================web.xml====================== <?xml   version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app   PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application   2.3//EN" "//java.sun.com/dtd/web-app_2_3.dtd">
    <servlet> <servlet-name>action</servlet-name>   <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>   <init-param> <param-name>config</param-name> <param-value>/WEB-INF/struts-config.xml</param-value>   </init-param> <load-on-startup>1</load-on-startup>   </servlet> <servlet-mapping>   <servlet-name>action</servlet-name>   <url-pattern>*.do</url-pattern> </servlet-mapping>   <welcome-file-list> <welcome-file>index.jsp</welcome-file>   </welcome-file-list> </web-app>   =================struts-config.xml=================== <?xml   version="1.0" encoding="UTF-8"?> <!DOCTYPE   struts-config PUBLIC    "-//Apache Software   Foundation//DTD Struts Configuration 1.3//EN"      "//struts.apache.org/dtds/struts-config_1_3.dtd">
    <struts-config> <form-beans> <form-bean   name="userform"   type="com.formbean.UserForm"></form-bean>   </form-beans> <action-mappings> <action   path="/login" type="com.action.UserAction" name="userform"   validate="true" input="/index.jsp"> <forward   name="index" path="/index.jsp"></forward>   </action> </action-mappings> <controller>   </controller> <message-resources   parameter="MessageResources"> </message-resources>   <plug-in   className="org.apache.struts.validator.ValidatorPlugIn">   <set-property property="pathnames"   value="/org/apache/struts/validator/validator-rules.xml,/WEB-INF/validation.xml"/>   </plug-in> </struts-config>   ==============validation.xml========== <?xml version="1.0"   encoding="UTF-8"?> <!DOCTYPE form-validation   PUBLIC    "-//Apache Software Foundation//DTD Commons       Validator Rules Configuration   1.3.0//EN"      "//jakarta.apache.org/commons/dtds/validator_1_3_0.dtd">
    <form-validation> <formset> <form   name="userform"> <field property="name"   depends="required"> <arg position="0"   key="label.regest.name"/> </field> <field   property="password" depends="required"> <arg   position="0" key="label.regest.password"/>   </field> </form> </formset> </form-validation>
    =================MessageResources.properties======
    # Label Resourceslabel.search.name = Namelabel.search.ssNum=Social Security   Number
    #Error Resources
    error.required = {0} is required.error.search.criteria.missing = Search   Criteria Missingerror.search.ssNum.invalid = Invalid Social Security   Numbererrors.header = <font   color="red"><b><Validaction   Error(s)</b></font><ul>errors.footer=</ul><hr   width="100%" size="1"   noshade="true">errors.prefix=<li>errors.suffix=</li>errors.invalid={0}   is not valid
    ===================index.jsp==================== <%@page   contentType="text/html; charset=UTF-8"   language="java"%> <%@taglib prefix="html"   uri="//struts.apache.org/tags-html"%> <%@taglib   prefix="bean"   uri="//struts.apache.org/tags-bean"%> <%@taglib   prefix="logic"   uri="//struts.apache.org/tags-logic"%> <html>   <head><title>login</title></head> <body>   <html:form action="/login"> 用户：<html:text   property="name"/><br> 密码：<html:password   property="password"/><br> <html:submit   value="submit"/> <html:reset/> </html:form>
    <html:errors/> <!--当表单验证不通过时，显示错误信息--></body>   </html>    

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