Struts2校驗框架(轉)

[標題]:[原]Struts2校驗框架
[時間]:2009-7-27
[摘要]:校驗框架配置、客戶端校驗
[關鍵字]:浪曦視頻，Struts2應用開發(fā)系列，WebWork，Apache，validation
[環(huán)境]:struts-2.1.6、JDK6、MyEclipse7、Tomcat6
[作者]:Winty (wintys@gmail.com) http://www.tkk7.com/wintys

[正文]:
Struts校驗框架提供了一種不用編寫代碼，只需修改配置文件即可對輸入進行校驗的功能。代碼方式校驗，即重寫validate()方法。實際應用中，validate()與校驗框架一般只選其一。

1、校驗框架配置
在RegisterAction.java相同目錄新建校驗框架配置文件RegisterAction-validation.xml。RegisterAction-validation.xml的DTD可以復制struts自帶的示例struts2-mailreader-2.1.6中的DTD:

<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

xwork-validator-1.0.2.dtd:

<?xml version="1.0" encoding="UTF-8"?>



<!ELEMENT validators (field|validator)+>

<!ELEMENT field (field-validator+)>
<!ATTLIST field
   name CDATA #REQUIRED
>

<!ELEMENT field-validator (param*, message)>
<!ATTLIST field-validator
   type CDATA #REQUIRED
    short-circuit (true|false) "false"
>

<!ELEMENT validator (param*, message)>
<!ATTLIST validator
   type CDATA #REQUIRED
    short-circuit (true|false) "false"
>

<!ELEMENT param (#PCDATA)>
<!ATTLIST param
    name CDATA #REQUIRED
>

<!ELEMENT message (#PCDATA)>
<!ATTLIST message
    key CDATA #IMPLIED
>

RegisterAction-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>

    <field name="name">
        <field-validator type="requiredstring" >
            <param name="trim">true</param>
            <message>name required</message>
        </field-validator>
        <field-validator type="stringlength">
            <param name="trim">true</param>
            <param name="minLength">6</param>
            <param name="maxLength">10</param>
            <message>name length range : ${minLength} ~ ${maxLength}</message>
        </field-validator>
    </field>

    <field name="age">
        <field-validator type="conversion" short-circuit="true">
            <message>the field age conversion error</message>
        </field-validator>
        <field-validator type="int">
            <param name="min">1</param>
            <param name="max">150</param>
            <message>age range: ${min} ~ ${max}</message>
        </field-validator>
    </field>

    <field name="birthday">
        <field-validator type="required">
            <message>birthday required</message>
        </field-validator>
        <field-validator type="date">
            <param name="min">2009-01-01</param>
            <param name="max">2009-12-31</param>
            <message>birthday range: ${min} ~ ${max}</message>
        </field-validator>
    </field>

    <field name="email">
        <field-validator type="email">
            <message>invalid email address</message>
        </field-validator>
    </field>
</validators>

說明:
a.校驗框架有兩種校驗方式:field和validator。
field校驗:先指定需要校驗的屬性，再指定校驗方式。validator校驗:先指定校驗方式，再指定需要校驗的屬性。兩種方式是等價的。

field校驗:
<field name="name">
   <field-validator type="requiredstring" >
       <param name="trim">true</param>
       <message>name required</message>
   </field-validator>
   <field-validator type="stringlength">
       <param name="trim">true</param>
       <param name="minLength">6</param>
       <param name="maxLength">10</param>
       <message>name length range : ${minLength} ~ ${maxLength}</message>
   </field-validator>
</field>

validator校驗:
<validator type="requiredstring">
   <param name="fieldName">name</param>
   <param name="trim">true</param>
   <message>name required</message>
</validator>
<validator type="stringlength">
   <param name="fieldName">name</param>
    <param name="trim">true</param>
    <param name="minLength">6</param>
    <param name="maxLength">10</param>
    <message>name length range : ${minLength} ~ ${maxLength}</message>
</validator>

b.<field-validator type="requiredstring" >中的type及其對應的xwork類可以在xwork-2.1.2.jar/com.opensymphony.xwork2.validator.validators/default.xml中查找到。
default.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
        "-//OpenSymphony Group//XWork Validator Config 1.0//EN"
        "http://www.opensymphony.com/xwork/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="long" class="com.opensymphony.xwork2.validator.validators.LongRangeFieldValidator"/>
    <validator name="short" class="com.opensymphony.xwork2.validator.validators.ShortRangeFieldValidator"/>
    <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"/>
</validators>

c. 對于校驗<field-validator type="requiredstring" >:String用requiredstring，其它類型用required。
d. 驗證錯誤將默認產生FieldError。
e. short-circuit="true" : 一個校驗失敗，是否是繼續(xù)執(zhí)行后續(xù)校驗。
f. 對于相同屬性的FieldError，validate()方法中的驗證和RegisterAction-validation.xml中的驗證都會執(zhí)行,并且FieldError都會顯示。
執(zhí)行順序: RegisterAction-validation.xml => validate()。

2、特定于業(yè)務邏輯的局部校驗:
對于struts.xml中<action>的method="register"指定的業(yè)務方法register()，使用校驗RegisterAction-register-validation.xml(與RegisterAction.java在同一目錄下)。同時，RegisterAction-validation.xml會被執(zhí)行。執(zhí)行順序: RegisterAction-validation.xml => RegisterAction-register-validation.xml

3、Struts2客戶端校驗
   設置struts標簽<s:form>中validate="true"。這樣就會根據RegisterAction-validation.xml生成頁面Javascript，在客戶端執(zhí)行校驗。

注意:
a.struts標簽不能使用simple主題。
b.Struts2客戶端校驗功能較弱，一般不用。

4、FieldError和ActionError的實現
a.真正存放field級別錯誤信息的對象是LinkedHashMap。
b.該LinkedHashMap的key是String類型的，value是ArrayList類型，所以同一個key可以對應多個錯誤消息。
c.對于Action級別的錯誤信息，實際上是放置在ArrayList中的。

[參考資料]:
    《浪曦視頻之Struts2應用開發(fā)系列》

posted on 2010-07-27 10:01 勒緊皮帶向前沖閱讀(1165) 評論(0) 編輯收藏所屬分類: struts

導航

統計

常用鏈接

留言簿(3)

隨筆分類

隨筆檔案

blogjava

搜索

最新評論

閱讀排行榜

評論排行榜

Struts2校驗框架(轉)