Question

我正在尝试在Struts2（2.3.16）中构建一个自定义验证器，如下所示。

package validator;

import actions.DiscountAction;
import com.opensymphony.xwork2.validator.ValidationException;
import com.opensymphony.xwork2.validator.validators.ValidatorSupport;
import org.joda.time.DateTime;

public final class DiscountDateValidator extends ValidatorSupport
{
    private DateTime startDate;
    private DateTime endDate;

    //Getters and setters.

    @Override
    public void validate(Object o) throws ValidationException
    {
        System.out.println("startDate = "+startDate);
        System.out.println("endDate = "+endDate);
        System.out.println((o instanceof DiscountAction));
    }
}

validators.xml文件如下所示。

<?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="discountDateValidator" 
               class="validator.DiscountDateValidator"/>
</validators>

此验证器用于以下操作中。

@Namespace("/admin_side")
@ResultPath("/WEB-INF/content")
@ParentPackage(value="struts-default")
public final class DiscountAction extends ActionSupport implements Serializable, ValidationAware, ModelDriven<Discount>
{
    @Autowired
    private final transient DiscountService discountService=null;
    private static final long serialVersionUID = 1L;

    private Discount entity=new Discount();

    @Override
    public Discount getModel() {
        return entity;
    }

    @Validations(
        customValidators={
            @CustomValidator(type="discountDateValidator", parameters={
                @ValidationParameter(name="startDate", value="${entity.discountStartDate}"), 
                @ValidationParameter(name="endDate", value="${entity.discountEndDate}")}, 
            message="xxx zzz aaa")})
    @Action(value = "AddDiscount",
    results = {
        @Result(name=ActionSupport.SUCCESS, type="redirectAction", params={"namespace", "/admin_side", "actionName", "Discount", "currentPage", "${currentPage}", "message", "${message}", "editId", "${editId}", "status", "${status}"}),
        @Result(name = ActionSupport.INPUT, location = "Discount.jsp")},
    interceptorRefs={@InterceptorRef(value="defaultStack", params={"params.acceptParamNames", "editId, discountId, discountCode, discountPercent, discountStartDate, discountEndDate, currentPage, rowCount, totalPages, status", "validation.validateAnnotatedMethodOnly", "true"})})
    public String insert(){
        return ActionSupport.SUCCESS;
    }
}

在提交表单时会调用validate() DiscountDateValidator方法，startDate和endDate的值始终为null，{{ 1}}评估为o instanceof DiscountAction。

我在这里俯瞰什么？

Answer 1

这是因为${discountStartDate}和${discountEndDate}（@ValidationParameter的值属性）直接设置为验证器的字符串属性，我们需要使用{{1}手动解析Object parse(String expression, Class type)方法中的方法。

这些表达式由validate()方法评估为OGNL表达式。这些更改后的验证器如下。

parse()

package validator; import actions.DiscountAction; import com.opensymphony.xwork2.validator.ValidationException; import com.opensymphony.xwork2.validator.validators.ValidatorSupport; import org.joda.time.DateTime; public final class DiscountDateValidator extends ValidatorSupport { private String startDate; //Set to ${discountStartDate} private String endDate; //Set to ${discountEndDate} public String getStartDate() { return startDate; } public void setStartDate(String startDate) { this.startDate = startDate; } public String getEndDate() { return endDate; } public void setEndDate(String endDate) { this.endDate = endDate; } @Override public void validate(Object o) throws ValidationException { DateTime discountStartDate = (DateTime)parse(startDate, DateTime.class); DateTime discountEndDate = (DateTime)parse(endDate, DateTime.class); System.out.println("startDate = "+discountStartDate); System.out.println("endDate = "+discountEndDate); System.out.println((o instanceof DiscountAction)); //Perform validation as required using these values. } }和getFieldValue("discountStartDate", o)也可以直接检索字段值（我不确定此方法在此类验证器中的任何副作用）。

_{getFieldValue("discountEndDate", o)和${entity.discountStartDate}不是必需的（${entity.discountStartDate}应该被排除，因为它包含在问题中）。}

自定义验证程序不会将参数值设置为Struts2中验证程序的属性

1 个答案: