（七）Struts2 验证框架

所有的学习我们必须先搭建好Struts2的环境（1、导入对应的jar包，2、web.xml，3、struts.xml）

第一节：Struts2 验证简介

Struts2 基于Struts2 拦截器，为开发者提供了一套易用的验证框架，并可扩展；一般的验证都支持。

第二节：Struts2 内置验证

一，普通字段验证

二，验证表达式：

<s:actionerror/>（在配置信息中最后“用户名和真实姓名不能相同”的话，即表明有error，所以用表达式，在前端页面会有显示）

例子：

struts.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE struts PUBLIC
     "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
     "http://struts.apache.org/dtds/struts-2.0.dtd">

 <struts>

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

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

     </package>

 </struts>

User.java

 package com.wishwzp.model;

 public class User {

     private String userName;//用户名
     private String name;//真实姓名
     private int age;//年龄
     private String email;//邮件
     private String homePage;//主页

     public String getUserName() {
         return userName;
     }
     public void setUserName(String userName) {
         this.userName = userName;
     }
     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 getEmail() {
         return email;
     }
     public void setEmail(String email) {
         this.email = email;
     }
     public String getHomePage() {
         return homePage;
     }
     public void setHomePage(String homePage) {
         this.homePage = homePage;
     }
     @Override
     public String toString() {
         return "User [userName=" + userName + ", name=" + name + ", age=" + age
                 + ", email=" + email + ", homePage=" + homePage + "]";
     }

 }

RegisterAction.java

 package com.wishwzp.action;

 import com.wishwzp.model.User;
 import com.opensymphony.xwork2.ActionSupport;

 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;
     }

 }

RegisterAction-validation.xml      （这个文件命名规范：XXXX-validation.xml,其中XXXX就是后台action类）

 <?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>

     <!-- 用户名格式验证 -->
     <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>

     <!-- 真实姓名格式验证 -->
     <field name="user.name">
         <field-validator type="requiredstring">
             <message>请输入姓名</message>
         </field-validator>
     </field>

     <!-- 年龄格式验证 -->
     <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>

     <!-- 邮件格式验证 -->
     <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>

     <!-- 主页格式验证 -->
     <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>

     <!-- 用户名和真实姓名不能相同验证 -->
     <!-- !user.name.equals(user.userName)     用户名和真实姓名不能相等，如果相等就是错误的信息，前端页面会有"<s:actionerror>"表达式显示错误信息 -->
     <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>

register.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <%@taglib prefix="s" uri="/struts-tags" %>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Insert title here</title>
 </head>
 <body>

 <!-- 这是就是用户名和真实姓名错误后显示的信息 -->
 <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="邮件"></s:textfield>
     <s:textfield name="user.homePage" label="主页"></s:textfield>
     <s:submit value="注册"></s:submit>
 </s:form>
 </body>
 </html>

success.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <%@taglib prefix="s" uri="/struts-tags" %>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Insert title here</title>
 </head>
 <body>
 注册成功
 </body>
 </html>

结果显示：（什么都没有写就提交了的结果显示）

第三节：自定义验证

例子：

validators.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE validators PUBLIC
         "-//Apache Struts//XWork Validator Config 1.0//EN"
         "http://struts.apache.org/dtds/xwork-validator-config-1.0.dtd">
 <validators>
     <validator name="required" class="com.opensymphony.xwork2.validator.validators.RequiredFieldValidator"/>
     <validator name="requiredstring" class="com.opensymphony.xwork2.validator.validators.RequiredStringValidator"/>
     <validator name="int" class="com.opensymphony.xwork2.validator.validators.IntRangeFieldValidator"/>
     <validator name="double" class="com.opensymphony.xwork2.validator.validators.DoubleRangeFieldValidator"/>
     <validator name="date" class="com.opensymphony.xwork2.validator.validators.DateRangeFieldValidator"/>
     <validator name="expression" class="com.opensymphony.xwork2.validator.validators.ExpressionValidator"/>
     <validator name="fieldexpression" class="com.opensymphony.xwork2.validator.validators.FieldExpressionValidator"/>
     <validator name="email" class="com.opensymphony.xwork2.validator.validators.EmailValidator"/>
     <validator name="url" class="com.opensymphony.xwork2.validator.validators.URLValidator"/>
     <validator name="visitor" class="com.opensymphony.xwork2.validator.validators.VisitorFieldValidator"/>
     <validator name="conversion" class="com.opensymphony.xwork2.validator.validators.ConversionErrorFieldValidator"/>
     <validator name="stringlength" class="com.opensymphony.xwork2.validator.validators.StringLengthFieldValidator"/>
     <validator name="regex" class="com.opensymphony.xwork2.validator.validators.RegexFieldValidator"/>
     <validator name="conditionalvisitor" class="com.opensymphony.xwork2.validator.validators.ConditionalVisitorFieldValidator"/>

     <!-- 自己定义配置的validatiors验证敏感词汇 -->
     <validator name="sensitive" class="com.wishwzp.validators.SensitiveWordValidators"/>
 </validators>

SensitiveWordValidators.java

 package com.wishwzp.validators;

 import com.opensymphony.xwork2.validator.ValidationException;
 import com.opensymphony.xwork2.validator.validators.FieldValidatorSupport;

 public class SensitiveWordValidators extends FieldValidatorSupport{

     @Override
     public void validate(Object object) throws ValidationException {
         String fieldName=this.getFieldName();//获取字段名称
         String value=this.getFieldValue(fieldName, object).toString();//获取用户输入的值
         if(!check(value)){
             this.addFieldError(fieldName, object);
         }
     }

     public boolean check(String value){
         String sensitiveWords[]={"你妹","你妈"};//敏感词汇
         for(int i=0;i<sensitiveWords.length;i++){
             if(value.indexOf(sensitiveWords[i])>-1){
                 return false;
             }
         }
         return true;
     }

 }

struts.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE struts PUBLIC
     "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
     "http://struts.apache.org/dtds/struts-2.0.dtd">

 <struts>

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

         <action name="validationAction" class="com.wishwzp.action.ValidationAction">
             <result name="input">/validation.jsp</result>
             <result name="success">/success.jsp</result>
         </action>

     </package>

 </struts>

ValidationAction.java

 package com.wishwzp.action;

 import com.wishwzp.model.User;
 import com.opensymphony.xwork2.ActionSupport;

 public class ValidationAction extends ActionSupport{

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

     private String name;

     public String getName() {
         return name;
     }

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

     @Override
     public String execute() throws Exception {
         System.out.println("姓名："+name);
         return SUCCESS;
     }

 }

ValidationAction-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="name">
         <field-validator type="requiredstring">
             <message>请输入姓名</message>
         </field-validator>

         <field-validator type="sensitive">
             <message>有敏感词汇</message>
         </field-validator>
     </field>

 </validators>

validation.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <%@taglib prefix="s" uri="/struts-tags" %>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Insert title here</title>
 </head>
 <body>
 简单自定义验证
 <s:form action="/validationAction" method="post">
     <s:textfield name="name" label="姓名"></s:textfield>
     <s:submit value="提交"></s:submit>
 </s:form>
 </body>
 </html>

结果：

如果输入敏感词提交的话：

如果输入不是敏感词提交的话：