springboot运行配置jsp

springboot运行配置jsp

参考：https://blog.csdn.net/qq_43470725/article/details/119750430

https://blog.csdn.net/qq_43470725/article/details/121969868

pom:

 
		 
            org.springframework.boot
            spring-boot-starter-web
        
        
            javax.servlet
            javax.servlet-api
        
        
            javax.servlet
            jstl
        
        
        
            org.apache.tomcat.embed
            tomcat-embed-jasper
            provided
        

yml:

#jsp支持
  mvc:
    view:
      prefix: /WEB-INF/jsp/
      suffix: .jsp
#关闭默认模板引擎（thymeleaf）,才会支持jsp
  thymeleaf:
    cache: false
    enabled: false

jsp：

<%@ page import="java.io.File" %>
<%@ page import="org.apache.commons.fileupload.disk.DiskFileItemFactory" %>
<%@ page import="org.apache.commons.fileupload.servlet.ServletFileUpload" %>
<%@ page import="org.apache.commons.fileupload.FileItem" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="java.util.*" %><%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2021/8/17
  Time: 10:23
  To change this template use File | Settings | File Templates.
--%>
<%--<%@ page contentType="text/html;charset=UTF-8" language="java" %>--%>
<%----%>
<%----%>
<%--    --%>
<%----%>
<%----%>

<%----%>
<%----%>
<%--语法：https://www.w3cschool.cn/jsp/jsp-syntax.html
   1、脚本程序： 可以包含任意量的Java语句、变量、方法或表达式，只要它们在脚本语言中是有效的：<% 代码片段 %>
或者，您也可以编写与其等价的XML语句

  代码片段

    2、任何文本、HTML标签、JSP元素必须写在脚本程序的外面
    3、JSP声明 ：用来声明变量和方法
    一个声明语句可以声明一个或多个变量、方法，供后面的Java代码使用。在JSP文件中，您必须先声明这些变量和方法然后才能使用它们。
JSP声明的语法格式：  <%! declaration; [ declaration; ]+ ... %>
    <%! int i = 0; %>
<%! int a, b, c; %>
<%! Circle a = new Circle(2.0); %>

    4、JSP表达式
    一个JSP表达式中包含的脚本语言表达式，先被转化成String，然后插入到表达式出现的地方。

    由于表达式的值会被转化成String，所以您可以在一个文本行中使用表达式而不用去管它是否是HTML标签。

    表达式元素中可以包含任何符合Java语言规范的表达式，但是不能使用分号来结束表达式。

    JSP表达式的语法格式：

    <%= 表达式 %>

    5、JSP隐含对象
        JSP支持九个自动定义的变量，江湖人称隐含对象。这九个隐含对象的简介见下表：
    	request     HttpServletRequest类的实例
        response    HttpServletResponse类的实例
        out         PrintWriter类的实例，用于把结果输出至网页上
        session     HttpSession类的实例
        application ServletContext类的实例，与应用上下文有关
        config      ServletConfig类的实例
        pageContext PageContext类的实例，提供对JSP页面所有对象以及命名空间的访问
        page        类似于Java类中的this关键字
        Exception   Exception类的对象，代表发生错误的JSP页面中对应的异常对象

    6、控制流语句
    JSP提供对Java语言的全面支持。您可以在JSP程序中使用Java API甚至建立Java代码块，包括判断语句和循环语句等等：
    判断语句：eg:
    <%! int day = 3; %>
    
    
    
    
    
    <% if (day == 1 | day == 7) { %>
      
 Today is weekend
    <% } else { %>
      
 Today is not weekend
    <% } %>
    
    


--%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%--设置cookie--%>
<%

    // 为 first_name 和 last_name设置cookie
//    cookie firstName = new cookie("first_name", request.getParameter("first_name"));
//    cookie lastName = new cookie("last_name",request.getParameter("last_name"));
    cookie firstName = new cookie("first_name", "123");
    cookie lastName = new cookie("last_name","456");
    // 设置cookie过期时间为24小时。
    firstName.setMaxAge(60*60*24);
    lastName.setMaxAge(60*60*24);
//    firstName.setMaxAge(10);
//    lastName.setMaxAge(10);
    // 在响应头部添加cookie
    response.addcookie( firstName );
    response.addcookie( lastName );
%>



    



<%!
    private int initVar=0;
    private int serviceVar=0;
    private int destroyVar=0;
%>

<%!
    public void jspInit(){
        initVar++;
        System.out.println("jspInit(): JSP被初始化了"+initVar+"次");
    }
    public void jspDestroy(){
        destroyVar++;
        System.out.println("jspDestroy(): JSP被销毁了"+destroyVar+"次");
    }
%>

<%
    serviceVar++;
    System.out.println("_jspService(): JSP共响应了"+serviceVar+"次请求");

    String content1="初始化次数 : "+initVar;
    String content2="响应客户请求次数 : "+serviceVar;
    String content3="销毁次数 : "+destroyVar;
%>
w3cschool教程 JSP 测试实例
<%=content1 %>
<%=content2 %>
<%=content3 %>


    
First Name:
        <%= request.getParameter("first_name")%>
    
    
Last  Name:
        <%= request.getParameter("last_name")%>
    




<%--获取cookie--%>
<%
    cookie cookie = null;
    cookie[] cookies = null;
    // 获取cookies的数据,是一个数组
    cookies = request.getcookies();
    if( cookies != null ){
        out.println(" Found cookies Name and Value");
        for (int i = 0; i < cookies.length; i++){
            cookie = cookies[i];

            out.print("Name : " + cookie.getName( ) + ",  ");
            out.print("Value: " + cookie.getValue( )+" 
");
        }
    }else{
        out.println("No cookies founds");
    }
%>
<%--删除cookie--%>
<%
    // 获取当前域名下的cookies，是一个数组
    cookies = request.getcookies();
    if( cookies != null ){
        out.println(" Found cookies Name and Value");
        for (int i = 0; i < cookies.length; i++){
            cookie = cookies[i];
            if((cookie.getName( )).compareTo("first_name") == 0 ){
                cookie.setMaxAge(0);
                response.addcookie(cookie);
                out.print("Deleted cookie: " +
                        cookie.getName( ) + "
");
            }
            out.print("Name : " + cookie.getName( ) + ",  ");
            out.print("Value: " + cookie.getValue( )+" 
");
        }
    }else{
        out.println(
                "No cookies founds");
    }
%>

<%--session--%>
<%    // 获取session创建时间
 Date createTime = new Date(session.getCreationTime());
 // 获取最后访问页面的时间
 Date lastAccessTime = new Date(session.getLastAccessedTime());
 String title = "Welcome Back to my website";
 Integer visitCount = new Integer(0);
 String visitCountKey = new String("visitCount");
 String userIDKey = new String("userID");
 String userID = new String("ABCD");
 // 检测网页是否由新的访问用户
  if (session.isNew()){
      title = "Welcome to my website";
      session.setAttribute(userIDKey, userID);
      session.setAttribute(visitCountKey,  visitCount);
  }
  visitCount = (Integer)session.getAttribute(visitCountKey);
  visitCount = visitCount + 1;
  userID = (String)session.getAttribute(userIDKey);
  session.setAttribute(visitCountKey,  visitCount);
%>


    
        Session info
        Value
    
    
        id
        <% out.print( session.getId()); %>
    
    
        Creation Time
        <% out.print(createTime); %>
    
    
        Time of Last Access
        <% out.print(lastAccessTime); %>
    
    
        User ID
        <% out.print(userID); %>
    
    
        Number of visits
        <% out.print(visitCount); %>
    


<%--日期： https://www.w3cschool.cn/jsp/jsp-handling-date.html --%>
<%    Date date = new Date();    out.print( "" +date.toString()+"");
%>
<%
    Date dNow = new Date( );
    SimpleDateFormat ft = new SimpleDateFormat ("E yyyy.MM.dd 'at' hh:mm:ss a zzz");
    out.print( "" + ft.format(dNow) + "");
%>

<%--页面重定向--%>
<%--
<%
    out.print(request.getParameter("isSuccess"));
    String isSuccess = request.getParameter("isSuccess");
//    String isSuccess = "12";
    if("1".equals(isSuccess)){
        // 重定向到新地址
        String site = new String("http://www.w3cschool.cn");
        response.setStatus(response.SC_MOVED_TEMPORARILY);
        response.setHeader("Location", site);
    }
%>

<%--JSP 点击量统计--%>
<%
    Integer hitsCount = (Integer)application.getAttribute("hitCounter");
    if( hitsCount ==null || hitsCount == 0 ){
        
        out.println("Welcome to my website!"+"
");
        hitsCount = 1;
    }else{
        
        out.println("Welcome back to my website!"+"
");
        hitsCount += 1;
    }
    application.setAttribute("hitCounter", hitsCount);
    out.print("Total number of visits:"+hitsCount +"
");
%>

<%--JSP 自动刷新--%>
<%
    // Set refresh, autoload time as 5 seconds
    response.setIntHeader("Refresh", 60*24);
// Get current time
    Calendar calendar = new GregorianCalendar();
    String am_pm;
    int hour = calendar.get(Calendar.HOUR);
    int minute = calendar.get(Calendar.MINUTE);
    int second = calendar.get(Calendar.SECOND);
    if(calendar.get(Calendar.AM_PM) == 0)
        am_pm = "AM";
    else
        am_pm = "PM";
    String CT = hour+":"+ minute +":"+ second +" "+ am_pm;
    out.println("Crrent Time: " + CT + "n");
%>

controller:

package com.example.dtest.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/JSP")
public class JspTestController {

    @GetMapping("/001")
    public String myVueTest(){

        return "JspTest01";

    }

}

测试：