validatenumbergreaterthan.java

J2EE开发与Weblogic一书中的源代码

package webauction.web.helpers;

import weblogicx.jsp.tags.validators.CustomizableAdapter;

public class ValidateNumberGreaterThan extends CustomizableAdapter {

    private String fieldToValidate;
    private String expression;

    public ValidateNumberGreaterThan() {
        super();
    }

    public boolean validate(javax.servlet.ServletRequest req)
        throws Exception {
        boolean isOk = false;
        String val = req.getParameter(fieldToValidate);
        try {
            double entered = Double.parseDouble(val);
            double floor = Double.parseDouble(expression);
            if (entered > floor) {
                isOk = true;
            }
        } catch (NumberFormatException e1) {}

        return isOk;
    }

    public void setFieldToValidate(String fieldname) {
        this.fieldToValidate = fieldname;
    }

    public void setExpression(String expression) {
        this.expression = expression;
    }
}