struts2 数据校验

　　通过struts2中延续自xwork框架的validation.xml配置方式进行数据校验，因struts2 下存在三种请求参数的注入方式，固按照不同注入方式对validation.xml的配置进行总结。

一、Action类下直接参数的校验配置：

• web.xml文件配置struts过滤器：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

 <filter>
     <filter-name>struts2</filter-name>
     <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
 </filter>
 <filter-mapping>
     <filter-name>struts2</filter-name>
     <url-pattern>/*</url-pattern>
 </filter-mapping>

• bean文件：因直接在action类下进行注入及验证，不涉及bean文件，固略；
• RegistServiceDao文件存储注册业务逻辑，略；
• Action文件：

package com.action

public class RegAction extends ActionSupport{
    private String name;
    private String password;
    private String gender;
    private String email;
    private String address;

    private User userInfo;
    //setter和getter方法略;

    public User setInfo(){
        User info = new User();
        info.setname(this.name);
        info.setpassword(this.password);
        info.setgender(this.gender);
        info.setemail(this.email);
        info.setaddress(this.address);

        return info;
    }

    public String regist(){
        RegistServiceDao rsd = new RegistServiceDao();
        userInfo = setInfo();
        if(rsd.regist(usrInfo)){
            return "success";
        }else{
            return "input";
        }
    }
}

• struts配置文件配置action：

<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <package name="default" extends="struts-defualt">
        <action name="regist" class="com.action.RegistAction">
            <result name="success">success.jsp</result>
            <result name="INPUT">regist.jsp</result>
        </action>
    </package>
</struts>

****

• validation.xml文件配置校验器，命名规则为<ActionClassName>-<aliasName>-validation.xml，文件必须放在action文件的同目录下;　　

　　RegActoin-regiest-validation.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
        "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
        "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

    <validators>
        <feild name="name">
            <feild-validator type="requiredString">
                <message>用户名不能为空</message>
            </feild-validator>
        </feild>
        <feild name="password">
            <feild-validator type="requiredString">
                <message>密码不能为空</message>
            </feild-validator>
        </feild>
        <feild name="gender">
            <feild-validator type="requiredString">
                <message>性别不能为空</message>
            </feild-validator>
        </feild>
        <feild name="email">
            <feild-validator type="email">
                <message>油箱格式不正确</message>
            </feild-validator>
        </feild>
    </validators>

二、DomainModel的注入方式下的数据校验：

• web.xml配置文件无变化，同第一种；
• bean文件，包含setter和getter的完整bean文件：

package com.entity

public class User{
    private String name;
    private String password;
    private String gender;
    private String email;
    private String address;

    public User(){}

    public User(String name,String password,String gender,String email,String address){
        this.name = name;
        this.password = password;
        this.gender = gender;
        this.email = email;
        this.address = address;
    }

    //setter和getter方法略
}

• RegistServiceDao文件存储注册业务逻辑，略；
• Action文件，利用User对象注入数据，添加user的getter和setter方法，同时调用字段值时亦通过对象（user.getName())：

package com.action

public class RegAction extends ActionSupport{

    //无需实例化User
    private User user;

    public User getUser(){
        return user;
    }

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

    public String regist(){
        RegistServiceDao rsd = new RegistServiceDao();
        if(rsd.regist(user)){
            return "success";
        }else{
            return "input";
        }
    }
}

• struts配置文件配置Action，同第一种；

********

• validation.xml文件配置配置校验器，校验user对象的字段需通过visitor校验器，配置如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
        "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
        "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<validators>
    <field name="user">
        <field-validator type="visitor">
            <param name="context">abc</param>
            <param name="appendPrefix">true</param>
        </field-validator>
    </field>
</validators>

• User-abc-validation.xml文件配置visitor校验，命名规则为类似Action的校验配置文件，文件位置亦必须与实体类同一目录下：
  

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
        "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
        "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

    <validators>
        <feild name="name">
            <feild-validator type="requiredString">
                <message>用户名不能为空</message>
            </feild-validator>
        </feild>
        <feild name="password">
            <feild-validator type="requiredString">
                <message>密码不能为空</message>
            </feild-validator>
        </feild>
        <feild name="gender">
            <feild-validator type="requiredString">
                <message>性别不能为空</message>
            </feild-validator>
        </feild>
        <feild name="email">
            <feild-validator type="email">
                <message>油箱格式不正确</message>
            </feild-validator>
        </feild>
    </validators>

！！

• jsp文件改动，因DomainModel下的注入方式，对参数设定的字段名称需要加对象实例的前缀（user.name)：

<s:form action = "regist" method = "post">
    <s:textfield name="user.name" label="用户名"/>
    <s:password name="user.password" label="密码"/>
    <s:texfield name="user.gender" label="性别"/>
    <s:texfield name="user.email" label="油箱"/>
    <s:texfield name="user.address" label="地址"/>
    <s:submit/>
</s:form>

三、ModelDriven注入下的数据校验，与域模型相比，主要是Action及jsp注入参数发生变化，同时需要对visitor校验器参数进行调整：

• web.xml配置文件无变化；
• bean文件无变化；
• RegServiceDao文件无变化；
• Action文件，需做以下修改：
  • 声明ModelDriven接口（泛型接口）；
  • 需要声明getModel方法，同时对User类进行实例化；
  • 无需添加bean对象的getter和setter方法；

package com.action

public class RegAction extends ActionSupport implements ModelDriven<User>{

    //无需实例化User
    private User user;

     public User getModel(){
         if(user!=null){
             return user;
         }else{
             user = new User();
             return user;
         }
     }

    public String regist(){
        RegistServiceDao rsd = new RegistServiceDao();
        if(rsd.regist(user)){
            return "success";
        }else{
            return "input";
        }
    }
}

• struts文件配置Action无变化；

********

• validation.xml文件配置校验器，同第二种，使用visitor校验器，需要修改如下两个参数：
  • field标签的name属性为：model；
  • field下param标签的name为"appendPrefix" 属性的值修改为false（字段不再需要添加bean对象前缀）；
• User-abc-validation.xml配置校验器无变化；

！！

• jsp页面需做简单修改，接收参数不需添加bean对象前缀

<s:form action = "regist" method = "post">
    <s:textfield name="name" label="用户名"/>
    <s:password name="password" label="密码"/>
    <s:texfield name="gender" label="性别"/>
    <s:texfield name="email" label="油箱"/>
    <s:texfield name="address" label="地址"/>
    <s:submit/>
</s:form>