struts2------自定义校验器

自定义验证器必须实现 Validator 接口,为了简化校验器的开发，框架提供了两个抽象类ValidatorSupport 和FieldValidatorSupport。其中ValidatorSupport【用于定义非字段优先的校验器】和 FieldValidatorSupport【用于字段优先的校验器】实现了 Validator 接口，同时提供了用于实现数据校验的通用方法。

实现用户名称的唯一性校验---自定义校验器

继承FieldValidatorSupport实现字段有限的校验器

public class UniqueNameValidator extends FieldValidatorSupport {

@Override

public void validate(Object object) throws ValidationException {

// 覆盖定义validate方法实现数据校验逻辑

String name = this.getFieldName();// 获取输入域的名称<input>的name值

String value = this.getFieldValue(name, object).toString();// 获取用户输入的数据，已经完成了数据类型转换，可以直接获取到转换后的结果

// 具体的验证处理逻辑

if (value != null && value.trim().length() > 0) {

IUserServ userv = ServiceFactory.getUserService();

boolean bb = userv.existsName(value);

if(bb){//验证没有通过，用户名称已经存在，添加配置的默认报错信息

this.addFieldError(name, this.getDefaultMessage());

}

如果不是很通用的校验，比较建议使用validateXxxx的方法实现，不建议自定义校验器

如果使用了自定义校验方法validateXXX和校验框架两种方法，请注意没有互斥,两个都会被执行

2、注册校验器

将struts2-core.jar中/com/opensymphony/xwork2/validator/validators/default.xml拷贝到src根路径下，并更名为validators.xml，然后添加自定义校验器的说明

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

<!DOCTYPE validators PUBLIC

"-//Apache Struts//XWork Validator Definition 1.0//EN"

"http://struts.apache.org/dtds/xwork-validator-definition-1.0.dtd">

<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="creditcard"

class="com.opensymphony.xwork2.validator.validators.CreditCardValidator" />

<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" />

<validator name="uniqueName"

class="com.yao.action.validator.UniqueNameValidator" />

</validators>

3、在校验规则说明文件中引用自定义的校验器uniqueName

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

<!DOCTYPE validators PUBLIC

"-//Apache Struts//XWork Validator 1.0.3//EN"

"http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">

<field-validator type="requiredstring" short-circuit="true">

<message>用户名称必须填写!</message>

</field-validator>

<field-validator type="stringlength" short-circuit="true">

<message>用户名称应该在6到20个字符之间!</message>

</field-validator>

<field-validator type="uniqueName">

<message>用户名称已经被占用!</message>

</field-validator>

</field>

</validators>

struts2------自定义校验器

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