（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：