Use JSP to create an ultra-simple web calculator instance for sharing

This article mainly introduces an example of using JSP to create an ultra-simple web calculator. The method in this article uses the JavaBean Component. If you need a friend, you can refer to the following to implement a simple calculator program. Requirements: use jsp + javabean mode.
The source code of the project is as follows:
File: calculator. jsp

<% @ Page language = "java" pageEncoding = "UTF-8" %> <% @ page isErrorPage = "true" %> <% @ page errorPage = "calculator. jsp "%> <% @ taglib uri =" http://java.sun.com/jsp/jstl/core "prefix =" c "%>      Simple Computer       <% -- Create a Calculator object -- %>
 <% -- Set Value wildcard * Indicates setting all attributes -- %>
 <% -- Calculate -- %>
 
  
<% Cal. calculate (); %>
            
    
Calculation result: $ {cal. firstNum }$ {cal. operator }$ {cal. secondNum }=$ {cal. result}
   
 <% -- Construct url -- %>
         

The javabean code used in this article is as follows:

Package cn. zq. domain; public class Calculator {private String firstNum; private String operator; private String secondNum; private String result; public String getFirstNum () {return firstNum;} public void setFirstNum (String firstNum) {this. firstNum = firstNum;} public String getOperator () {return operator;} public void setOperator (String operator) {this. operator = operator;} public String GetSecondNum () {return secondNum;} public void setSecondNum (String secondNum) {this. secondNum = secondNum;} public String getResult () {return result;} public void setResult (String result) {this. result = result;} public Calculator () {} public Calculator (String firstNum, String operator, String secondNum, String result) {this. firstNum = firstNum; this. operator = operator; this. secondNum = s EcondNum; this. result = result;} public void calculate () {if (operator! = Null &&! Operator. equals ("") {double first = new Double (firstNum); double second = new Double (secondNum); char character = operator. charAt (0); switch (seconds) {case '+': result = first + second + ""; break; case '-': result = first-second + ""; break; case '*': result = first * second + ""; break; case '/': result = first/second + ""; break; default: throw new RuntimeException ("unknown operator! ");}}}}

The final result is as follows:

For more information about how to use JSP to create an ultra-simple web page calculator, see the PHP Chinese website!