JSP和Servlet（测试计数器）

来源：互联网发布：郑和知乎编辑：程序博客网时间：2024/06/05 20:33

ps：application是在整个服务器中起作用的，所以只要服务器不中断，数据还在保留。
commit.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><html>  <head>    <title>My JSP 'conmit.jsp' starting page</title>  </head>  <body>    <form action="commitServlet">        一、你觉得JavaWeb的课程好不好？<br>        <input type = "radio" name = "java" value = "hao">A、好<br>        <input type = "radio" name = "java" value = "buhao">B、不好<br>        <input type = "radio" name = "java" value = "haihaola">C、还好啦<br>        二、你的爱好是？<br>        <input type = "checkbox" name = "hobby" value = "basketball">A、basketball<br>        <input type = "checkbox" name = "hobby" value = "football">B、football<br>        <input type = "checkbox" name = "hobby" value = "volleyball">B、volleyball<br>        <input type = "submit" value = "提交">    </form>  </body></html>

commitServlet.java

package com;import java.io.IOException;import java.io.PrintWriter;import java.util.HashMap;import java.util.HashSet;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class commitServlet extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String javaWeb = request.getParameter("java");        String[] hobby = request.getParameterValues("hobby");        request.setAttribute("javaWeb", javaWeb);        request.setAttribute("hobby", hobby);        request.getRequestDispatcher("commit_Result.jsp").forward(request,                response);    }}

commit_Result.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><html><head><title>My JSP 'commit_Result.jsp' starting page</title></head><body>    <%        String javaWeb = (String) request.getAttribute("javaWeb");        String[] hobby = (String[]) request.getAttribute("hobby");    %>    <%        /*  HashMap<String , Integer> map = new HashMap<String, Integer>();         map.put("hao", 0);        map.put("buhao", 0);        map.put("haihaola", 0);        if("hao".equals(javaWeb)){            int i = 0;            i ++;            map.put("hao", i);        }else if("buhao".equals(javaWeb)){            int i;            map.put("buhao", i++);        }else if("haihaola".equals(javaWeb)){            int i = 0;            i ++;            map.put("haihaola", i);        }         */         /* 如果获得到的值不存在并且获得到的值与条件的相同            则用application设置setattribute为“1”；         */        if (application.getAttribute("hao") == null && "hao".equals(javaWeb)) {            application.setAttribute("hao", "1");            /* 如果不为空就累加 */        } else if ("hao".equals(javaWeb)) {            String java = (String) application.getAttribute("hao");            int num = Integer.parseInt(java);            num++;            String Str = String.valueOf(num);            application.setAttribute("hao", Str);        }        if (application.getAttribute("buhao") == null && "buhao".equals(javaWeb)) {            application.setAttribute("buhao", "1");        } else if ("buhao".equals(javaWeb)) {            String java = (String) application.getAttribute("buhao");            int num = Integer.parseInt(java);            num++;            String Str = String.valueOf(num);            application.setAttribute("buhao", Str);        }        if (application.getAttribute("haihaola") == null && "haihaola".equals(javaWeb)) {            application.setAttribute("haihaola", "1");        } else if ("haihaola".equals(javaWeb)) {            String java = (String) application.getAttribute("haihaola");            int num = Integer.parseInt(java);            num++;            String Str = String.valueOf(num);            application.setAttribute("haihaola", Str);        }        /* 循环数组所有的值 */        for(int i = 0;i<hobby.length;i++){            if (application.getAttribute("basketball") == null && "basketball".equals(hobby[i])) {                application.setAttribute("basketball", "1");            } else if ("basketball".equals(hobby[i])) {                String java = (String) application.getAttribute("basketball");                int num = Integer.parseInt(java);                num++;                String Str = String.valueOf(num);                application.setAttribute("basketball", Str);            }        }        for(int i = 0;i<hobby.length;i++){            if (application.getAttribute("football") == null && "football".equals(hobby[i])) {                application.setAttribute("football", "1");            } else if ("football".equals(hobby[i])) {                String java = (String) application.getAttribute("football");                int num = Integer.parseInt(java);                num++;                String Str = String.valueOf(num);                application.setAttribute("football", Str);            }        }        for(int i = 0;i<hobby.length;i++){            if (application.getAttribute("volleyball") == null && "volleyball".equals(hobby[i])) {                application.setAttribute("volleyball", "1");            } else if ("volleyball".equals(hobby[i])) {                String java = (String) application.getAttribute("volleyball");                int num = Integer.parseInt(java);                num++;                String Str = String.valueOf(num);                application.setAttribute("volleyball", Str);            }        }    %>    <a href="result.jsp">查看测试总结果</a></body></html>

result.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><html><head><title>My JSP 'result.jsp' starting page</title></head><body>    第一题测试结果为：    <br> “好”---<%=application.getAttribute("hao")%>次    <br> “不好”---<%=application.getAttribute("buhao")%>次    <br> “还好啦”---<%=application.getAttribute("haihaola")%>次    <br> 第二题测试结果为：    <br> “篮球”---<%=application.getAttribute("basketball")%>次    <br> “足球”---<%=application.getAttribute("football")%>次    <br> "排球"---<%=application.getAttribute("volleyball")%>次    <br><a href="conmit.jsp">再次做题</a></body></html>

效果图：
commit.jsp

commit_Result.jsp
这里写图片描述
result.jsp

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