Struts2中的collection验证

Struts2提供了Collection的转换器,可以直接把页面传递过来的参数转换成List Set类型,使用这个转换器能为我们节省不少手指运动量,但Collection的验证就成了一个问题.google之后,找到了这个资料[url=http://www.iteye.com/topic/176026]webwork数组形式提交表单及validation研究[/url].但文中的collection是xwork1的验证器,在xwork2中并不存在,于是想到把它从xwork1中转移过来.并修改了少许,使之可以支持多个验证器.

有2个类,CollectionFieldValidator和DefaultActionValidatorManager,因为都是xwork1的类,所以我们还要稍微改动一下.
[b]CollectionFieldValidator.java[/b]

//propertyname,e.g:persons.name
private String property;
	public String getProperty() { return this.property; }
	public void setProperty(String collection) { this.property = collection; }

	//all validatorRef split with ","
	private String validatorRefs;
	public String getValidatorRefs() { return this.validatorRefs; }
	public void setValidatorRefs(String validatorRefs) { this.validatorRefs = validatorRefs; }

	//a validator's param key start with it's ref
	private Map validatorParams = new LinkedHashMap();
	public void setValidatorParams(Map validatorParams) { this.validatorParams = validatorParams; }
	public Map getValidatorParams() { return validatorParams; }

//get all validator and set them then validate
public void validate(Object object) throws ValidationException {...}

//find all propertyname and put them into result (a recursion method)
protected void populateValue(Object obj, CloneableIterator iterator, List result, String overallPropertyName) throws OgnlException, CloneNotSupportedException {...}
}

因为CollectionFieldValidator.java中调用了xwork1的DefaultActionValidatorManager.java中的validate(Object object, List validators, ValidatorContext validatorContext)方法,但该方法在xwork2中不存在,甚至ActionValidatorManager中不存在这个方法接口,只能自己动手了.

[b]Xwork1DefaultActionValidatorManager.java[/b]

//继承了xwork2的DefaultActionValidatorManager
public class Xwork1DefaultActionValidatorManager extends DefaultActionValidatorManager{

//仅仅从xwork1的DefaultActionValidatorManager.java中拷贝过来
public void validate(Object object, List validators, ValidatorContext validatorContext) throws ValidationException {...}
}

使用方法如下:
[b]validators.xml[/b]

<validators>
    <validator name="collection" class="com.ddl.tools.CollectionFieldValidator"/>
</validators>

[b]ActionName-validattion.xml[/b]

<validators>
<!-- Action 中 Field 名-->
<field name="sentForm">
		<field-validator type="collection">  
<!-- 需要验证的属性,其中details是collection-->
			<param name="property">sentForm.details.requestQty</param>  
<!-- 以逗号分隔 -->
			<param name="validatorRefs">required,int</param>   
<!-- 验证器引用名_参数名-->
			<param name="validatorParams['required_messageKey']">receivedocument.requestQty.validate.required</param>
			<param name="validatorParams['int_messageKey']">receivedocument.requestQty.validate.int</param>
			<message>...</message>
		</field-validator>  
	</field>
<field name="sentForm">
		<field-validator type="collection">  
			<param name="property">sentForm.details.item</param>  
			<param name="validatorRefs">requiredstring</param>   
			<param name="validatorParams['requiredstring_messageKey']">receivedocument.item.validate.required</param>
			<message>...</message>
		</field-validator>  
	</field>
</validators>

可能有人注意到使用方法和上面提供的链接中稍有不同,这是因为原来的collection验证不能有多验证器.