calcbean.java

来自「OperaMasks是一种基于J2EE的Web开发技术」· Java 代码 · 共 50 行

package demo;

import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;

import org.operamasks.faces.annotation.Action;
import org.operamasks.faces.annotation.Bind;
import org.operamasks.faces.annotation.ManagedBean;
import org.operamasks.faces.annotation.ManagedBeanScope;
import org.operamasks.faces.annotation.Required;

@ManagedBean(name = "calcBean", scope = ManagedBeanScope.REQUEST)
public class CalcBean {
	@Bind
	@Required
	private double first = 22.0;

	@Bind
	@Required
	private double second = 7.0;

	@Bind
	private double result;

	@Action
	public void add() {
		result = first + second;
	}

	@Action
	public void subtract() {
		result = first - second;
	}

	@Action
	public void multiply() {
		result = first * second;
	}

	@Action
	public void divide() {
		if (second == 0) {
		    FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_ERROR, "Divide by zero", null);
		    FacesContext.getCurrentInstance().addMessage("calc:second", message);
		    return;
		}
		result = first / second;
	}
}