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
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;
}
@Override
public void validate(FacesContext context, UIComponent component,
Object value) throws ValidatorException {
//这里是具体验证的逻辑
}
@Override
public Object saveState(FacesContext context) {
Object values[] = new Object[3];
values[0] = precision;
values[1] = scale;
values[2]= mustPositive;
return (values);
}
@Override
public void restoreState(FacesContext context, Object state) {
Object values[] = (Object[]) state;
precision = (Integer) values[0];
scale = (Integer) values[1];
mustPositive=(Boolean)values[2];
}
@Override
public boolean isTransient() {
return false;
}
@Override
public void setTransient(boolean newTransientValue) {
}
}
numberValidator com.xx.web.validator.NumberValidator
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");
}
@Override
protected 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;
}
}validateNumber number com.xx.validator.NumberValidatorHandler
