ZK textbox Constraint验证

test.zul：

<?page title="" contentType="text/html;charset=UTF-8"?>
  
<zk xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xmlns="http://www.zkoss.org/2005/zul" 
        xsi:schemaLocation="http://www.zkoss.org/2005/zul http://www.zkoss.org/2005/zul">
<window id="testWin" border="none" apply="test.test19">
    邮箱：<textbox id="textbox"/>
</window>
</zk>

test19.java：

package test;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.WrongValueException;
import org.zkoss.zk.ui.util.GenericAutowireComposer;
import org.zkoss.zul.Constraint;
import org.zkoss.zul.Textbox;

public class test19 extends GenericAutowireComposer<Component>{
    
    private static final long serialVersionUID = 1L;
    
    private Textbox textbox;
    
    @Override
    public void doAfterCompose(Component comp) throws Exception {
        // TODO Auto-generated method stub
        
        super.doAfterCompose(comp);
        
        textbox.setConstraint(new Constraint() {

            @Override
            public void validate(Component comp, Object obj)
                    throws WrongValueException {
                if (obj == null || obj.toString().trim().length() == 0) {
                    throw new WrongValueException(comp, "邮箱不能为空！");
                }else {
                    String regex = "^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$";
                    boolean result = obj.toString().matches(regex);
                    if (result == false) {
                        throw new WrongValueException(comp, "邮箱格式有误！");
                    }
                }
            }
        });
    }    
}

效果：