一个例子jsf源码，费力从电驴上下的

package com.langsin; public class BackBean { private double firstNumber=0.0; private double secondNumber=0.0; private double result; private AddBean addbean=new AddBean(); public double getFirstNumber() { return firstNumber; } public void setFirstNumber(double firstNumber) { this.firstNumber = firstNumber; } public double getResult() { return result; } public void setResult(double result) { this.result = result; } public double getSecondNumber() { return secondNumber; } public void setSecondNumber(double secondNumber) { this.secondNumber = secondNumber; } public String add() { result=addbean.add(firstNumber, secondNumber); return "success"; } }