jsf1.2/facelet1.x 中convertor的自定义

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第一步，先定义一个validator继承jsf中的validator，如果需要有状态就必须实现StateHolder接口

package com.xx.web.validator;import javax.faces.component.StateHolder;import javax.faces.component.UIComponent;import javax.faces.context.FacesContext;import javax.faces.validator.Validator;import javax.faces.validator.ValidatorException;public class NumberValidator implements Validator, StateHolder {private int precision = 10;private int scale = 6;private boolean mustPositive = true;public NumberValidator() {}public void setPrecision(int precision) {this.precision = precision;}public void setScale(int scale) {this.scale = scale;}public void setMustPositive(Boolean mustPositive) {this.mustPositive = mustPositive;}@Overridepublic void validate(FacesContext context, UIComponent component,Object value) throws ValidatorException {<span style="white-space:pre"></span>//这里是具体验证的逻辑}@Overridepublic Object saveState(FacesContext context) {Object values[] = new Object[3];values[0] = precision;values[1] = scale;values[2]=mustPositive;return (values);}@Overridepublic void restoreState(FacesContext context, Object state) {Object values[] = (Object[]) state;precision = (Integer) values[0];scale = (Integer) values[1];mustPositive=(Boolean)values[2];}@Overridepublic boolean isTransient() {return false;}@Overridepublic void setTransient(boolean newTransientValue) {}}

在faces-confg.xml中添加以下代码

<validator>  <validator-id>numberValidator</validator-id>  <validator-class>com.xx.web.validator.NumberValidator</validator-class></validator>

到此为止validator已经可以使用了

<h:inputText>

<f:validator validatorId='numberValidator'></f:validator>

</h:inputText>

但是上面的参数无法添加

因为我们使用了facelet，所以要定义一个facelet的tag

package com.xx.web.validator;import javax.faces.validator.Validator;import com.sun.facelets.FaceletContext;import com.sun.facelets.tag.TagAttribute;import com.sun.facelets.tag.jsf.ValidateHandler;import com.sun.facelets.tag.jsf.ValidatorConfig;public class NumberValidatorHandler extends ValidateHandler {private final TagAttribute precisionAttr;private final TagAttribute scaleAttr;private final TagAttribute mustPositiveAttr;public NumberValidatorHandler(ValidatorConfig config) {super(config);precisionAttr = this.getAttribute("precision");scaleAttr = this.getAttribute("scale");mustPositiveAttr = this.getAttribute("mustPositive");}@Overrideprotected Validator createValidator(FaceletContext ctx) {NumberValidator result = (NumberValidator) ctx.getFacesContext().getApplication().createValidator("number");if (precisionAttr != null)result.setPrecision(Integer.valueOf(precisionAttr.getValue(ctx)));if (scaleAttr != null)result.setScale(Integer.valueOf(scaleAttr.getValue(ctx)));if (mustPositiveAttr != null)result.setMustPositive(Boolean.valueOf(mustPositiveAttr.getValue(ctx)));return result;}}

然后在taglib.xml中加入

<tag><tag-name>validateNumber</tag-name><validator><validator-id>number</validator-id><handler-class>com.xx.validator.NumberValidatorHandler</handler-class></validator></tag>

使用方法

<xx:inputText label="xxx"style="width:220px;"value="#{xx.xxValue}"><xx:validateNumber  precision="2" scale="3"></jd:validateNumber></xx:inputText>

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