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JSP学习笔记---应用做个简易计算器JSP+javabean

2016-08-29 22:31 381 查看

注意：

1.用到了<jsp:setProperty property="*" name="calculate"/>标签，注意javabean中参数变量务必要与表单提交数据名称相同。

Main.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'Main.jsp' starting page</title>
</head>

<body>

<jsp:useBean id="calculate" class="com.wanhao.Calculate"/>
<jsp:setProperty property="*" name="calculate"/>
<%
calculate.calculate();
out.write(calculate.getFirstNum()+calculate.getOperator()+calculate.getSecondNum()+"="+calculate.getResult());
%>

<form action="/Calculate/Main.jsp" method="post">
输入第一个数：<input type="text" name="firstNum">
选择操作：
<select name="operator">
<option>+
<option>-
<option>*
<option>/
</select>
输入第二个数：<input type="text" name="secondNum">
<input type="submit" name="计算" >
</form>

</body>
</html>
Calculate.java
package com.wanhao;

import java.math.BigDecimal;

public class Calculate {
String firstNum="0";
char operator='+';
String secondNum="0";
String result="0";
public char getOperator() {
return operator;
}
public void setOperator(char operator) {
this.operator = operator;
}
public String getResult() {
return result;
}
public void setResult(String result) {
this.result = result;
}
public String getFirstNum() {
return firstNum;
}
public void setFirstNum(String firstNum) {
this.firstNum = firstNum;
}
public String getSecondNum() {
return secondNum;
}
public void setSecondNum(String secondNum) {
this.secondNum = secondNum;
}
public void calculate()
{
BigDecimal number1=new BigDecimal(firstNum);
BigDecimal number2=new BigDecimal(secondNum);
switch(operator)
{
case '+': result=number1.add(number2).toString();break;
case '-': result=number1.subtract(number2).toString();break;
case '*': result=number1.multiply(number2).toString();break;
case '/': result=number1.divide(number2, 10, BigDecimal.ROUND_UP).toString();break;
default: result="0";
}

}

}

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标签： javabean jsp javabean+jsp应用简易计算器

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