基于servlet的MVC模式------MVC模式设计四则运算小web应用
1,理解mvc设计模式的核心思想,视图,模型,控制器。掌握mvc模式在jsp中的具体体现。
2,在mvc设计模式中,视图由jsp页面负责,模型由JavaBean负责,控制器由servlet负责。
3,模型(Model),一个或多个JavaBean对象,用于存数数据,JavaBean主要提供简单的setXXX()方法和getXXX()方法,在这些方法中不涉及对数据的具体处理细节。
4,视图(view),一个或者多个jsp页面,为模型提供数据展示,jsp页面主要使用HTML页面标记和JavaBean标记来显示数据
5,控制器(Controller):一个或者多个Servlet对象,根据视图提交的要求进行数据处理操作,并将有关结果存储到JavaBean当中,然后Servlet使用重定向方式请求视图中的某个jsp页面的更新显示,即让该jsp页面使用通过JavaBean标记显示控制器存储在JavaBean中的数据
下面是我设计的web应用,有两个jsp页面,inputNumber.jsp和showResult.jsp,一个javaBean和一个Servlet。jsp页面的inputNumber.jsp挺一个表单。,用户可以通过表单输入两个数和四则运算符号。提交给Servlet控制器,javaBean负责存储运算数,运算符号,运算结果。servlet负责四则运算,并将结果存储在javabean当中,并负责请求jsp页面showResult.jsp页面,显示javaBean中的数据。
主要用到的知识,转发。mvc设计思想。
step1,
inputNumber.jsp
[html]
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
</head>
<body>
<form action="operationservlet" method="post">
请输入数字1 <input type="text" name="number1"> 选择运算符 <input
type="radio" name="operation" value="+" checked /> <input
type="radio" name="operation" value="-"> <input type="radio"
name="operation" value="*"> <input type="radio"
name="operation" value="/"> 请输入数字2 <input type="text"
name="number2"> <input type="submit" value="提交">
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
</head>
<body>
<form action="operationservlet" method="post">
请输入数字1 <input type="text" name="number1"> 选择运算符 <input
type="radio" name="operation" value="+" checked /> <input
type="radio" name="operation" value="-"> <input type="radio"
name="operation" value="*"> <input type="radio"
name="operation" value="/"> 请输入数字2 <input type="text"
name="number2"> <input type="submit" value="提交">
</form>
</body>
</html>
step2
javaBean文件
[java]
public class Operation {
private int number1;
private String operation;
private int number2;
private int result;
public int getResult() {
return result;
}
public void setResult(int result) {
this.result = result;
}
public int getNumber1() {
return number1;
}
public void setNumber1(int number1) {
this.number1 = number1;
}
public String getOperation() {
return operation;
}
public void setOperation(String operation) {
this.operation = operation;
}
public int getNumber2() {
return number2;
}
public void setNumber2(int number2) {
this.number2 = number2;
}
}
public class Operation {
private int number1;
private String operation;
private int number2;
private int result;
public int getResult() {
return result;
}
public void setResult(int result) {
this.result = result;
}
public int getNumber1() {
return number1;
}
public void setNumber1(int number1) {
this.number1 = number1;
}
public String getOperation() {
return operation;
}
public void setOperation(String operation) {
this.operation = operation;
}
public int getNumber2() {
return number2;
}
public void setNumber2(int number2) {
this.number2 = number2;
}
}
step4
servlet控制器
[java]
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import bean.Operation;
public class operationServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
Operation oper=new Operation();
request.setAttribute("operation", oper);
String number11=request.getParameter("number1");
String operation=request.getParameter("operation");
System.out.println("我爱你"+operation);
String number22=request.getParameter("number2");
int number1=Integer.parseInt(number11);
int number2=Integer.parseInt(number22);
oper.setNumber1(number1);
oper.setNumber2(number2);
oper.setOperation(operation);
if(operation.equals("+")){
oper.setResult(number2+number1);
} 
补充:web前端 , HTML/CSS ,