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实验14 MVC

作者：从前慢现在也慢 | 2024-05-04 19:31:09

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实验14 MVC

二、实验项目内容（实验题目）

编写代码，掌握MVC的用法。【参考课本例1 】

三、源代码以及执行结果截图：

example7_1.jsp：

<%@ page contentType="text/html" %>

<%@ page pageEncoding = "utf-8" %>

<jsp:useBean id="digitBean" class ="save.data.Example7_1_Bean" scope="request"/>

<style>

#tom{

font-family:宋体;font-size:26;color:blue

}

</style>

<table>

<tr><td id =tom> 输入两个数:</td>

<input type=text name="numberOne"

value=<%= digitBean.getNumberOne() %> id =tom size=6/></td>

<td><input type=text name="numberTwo"

value=<%=digitBean.getNumberTwo()%> id =tom size=6/></td>

</tr>

<tr><td id =tom>选择运算符号:</td>

<option value="+">+(加)

<option value="-">-(减)

<option value="*">*(乘)

<option value="/">/(除)

</select>

</td>

</tr>

</table></form>

运算结果：

<jsp:getProperty name="digitBean" property="numberOne"/>

<jsp:getProperty name="digitBean" property="operator"/>

<jsp:getProperty name="digitBean" property="numberTwo"/> =

<jsp:getProperty name="digitBean" property="result"/>

</p></body></HTML>

Example7_1_Servlet.Java：

package handle.data;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

import save.data.*;

public class Example7_1_Servlet extends HttpServlet{

public void init(ServletConfig config) throws ServletException{

super.init(config);

}

public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{

Example7_1_Bean digitBean = null;

digitBean = new Example7_1_Bean();

request.setAttribute("digitBean",digitBean);

String str1 = request.getParameter("numberOne");

String str2 = request.getParameter("numberTwo");

if(str1==null||str2==null)

return;

if(str1.length()==0||str2.length()==0)

return;

double numberOne = Double.parseDouble(str1);

double numberTwo = Double.parseDouble(str2);

String operator = request.getParameter("operator");

double result=0;

if(operator.equals("+"))

result = numberOne+numberTwo;

else if(operator.equals("-"))

result = numberOne-numberTwo;

else if(operator.equals("*"))

result = numberOne*numberTwo;

else if(operator.equals("/"))

result = numberOne/numberTwo;

digitBean.setNumberOne(numberOne);

digitBean.setNumberTwo(numberTwo);

digitBean.setOperator(operator);

digitBean.setResult(result);

RequestDispatcher dispatcher= request.getRequestDispatcher("example7_1.jsp");

dispatcher.forward(request,response);

}

public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{

doPost(request,response);

}

Example7_1_Bean：

package save.data;

public class Example7_1_Bean {

double numberOne,numberTwo,result;

String operator="+";

public void setNumberOne(double n){

numberOne=n;

}

public double getNumberOne(){

return numberOne;

}

public void setNumberTwo(double n){

numberTwo=n;

}

public double getNumberTwo(){

return numberTwo;

}

public void setOperator(String s){

operator=s.trim();;

}

public String getOperator(){

return operator;

}

public void setResult(double r){

result=r;

}

public double getResult(){

return result;

}

Web.xml：

<?xml version="1.0" encoding="utf-8"?>

<web-app>

<servlet-name>computer</servlet-name>

<servlet-class>handle.data.Example7_1_Servlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>computer</servlet-name>

<url-pattern>/computer</url-pattern>

</servlet-mapping>

<servlet-name>handleExpress</servlet-name>

<servlet-class>handle.data.ExpressWish_Servlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>handleExpress</servlet-name>

<url-pattern>/handleExpress</url-pattern>

</servlet-mapping>

<servlet-name>shopping</servlet-name>

<servlet-class>handle.data.Example7_2_Servlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>shopping</servlet-name>

<url-pattern>/shopping</url-pattern>

</servlet-mapping>

</web-app>

结果图：

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