SpringMVC访问WEB-INF下的jsp解决方案&Spring Boot集成使用jsp

电玩女神 2023-09-30 13:24 40阅读 0赞

## SpringMVC访问WEB-INF下的jsp解决方案 ##

### 一. 问题 ###

将项目中用到的jsp等文件放在WEB-INF目录下。实际开发过程中，需要在框架页面通过iframe嵌入对应的具体页面，此处如果直接调用对应页面所在的url地址，则会提示404错误。

WEB-INF目录下的文件不能直接访问，需要映射，jsp放在那里也不能访问，应该是servlet或javabean才行。

### 二.解决思路 ###

#### 1. 为什么要将对应jsp放在WEB-INF下？ ####

传统的java web项目考虑一定的安全性都会选择把jsp放在web-inf下，毕竟jsp存在部分java代码是要经过编译运行的，通过后台servlet action或者controller进行跳转，这样也便于统一管理维护。再做一些过滤器拦截器之类的安全措施可以说是双重保险。

#### 2.如何实现正常访问 ####

**（1）直接把JSP页面放到WEB-INF外的webapp目录下；**

**（2）Controller进行处理；**

通过ModelAndView来进行跳转，跳转到compare.jsp页面。当然要用ModelAndView的话需要在Spring的配置文件中配置  
视图解析器。

**（3）jsp:forward page；**

<jsp:forward page="{路径|<%=表达式%>}"/>
     
    　　<jsp:param name="参数名称" value="参数内容"/>
     
    </jsp:forward>

**（4）基于视图解析器，添加mvc:view-controller**

两种用法

1、重定向  
<mvc:view-controller path=“/” view-name=“redirect:/admin/index”/>  
即如果当前路径是/ 则重定向到/admin/index

2、view name  
<mvc:view-controller path=“/” view-name=admin/index"/>  
如果当前路径是/ 则交给相应的视图解析器直接解析为视图

mvc:view-controller相当于@RequestMapping

**注意：**

**1. 使用这个标签后，必须配置，否则会造成所有的@Controller注解无法解析**

**2.如果请求存在处理器，则这个标签对应的请求处理不起作用。因为请求先去找处理器，如果找不到，才使用这个标签**

--------------------

## Spring Boot集成使用jsp ##

### 简介： ###

官方不推荐使用jsp作为页面,我们可以使用其他的模板引擎，比如 Thymeleaf和 freemarker，官方主推的是Thymeleaf。但是目前来说,很多项目的页面还是用的jsp.而且很多现成的项目用的jsp页面,扒过来就能用,当然如果时间允许的情况，还是不建议大家使用jsp，而是采用官方推荐的模板。

### 搭建项目 ###

#### 1.新建一个基础的 springboot WEB项目 ####

#### 2.pom.xml文件jar包 ####

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
       <modelVersion>4.0.0</modelVersion>
       <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>2.1.3.RELEASE</version>
          <relativePath/> 
       </parent>
       <groupId>com.mr</groupId>
       <artifactId>springboot_jsp</artifactId>
       <version>0.0.1-SNAPSHOT</version>
       <name>springboot_jsp</name>
       <description>Demo project for Spring Boot</description>
    
       <properties>
          <java.version>1.8</java.version>
       </properties>
       <packaging>war</packaging>
       <dependencies>
          <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
          </dependency>
    
          <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
          </dependency>
    
    
          
          
          <dependency>
             <groupId>javax.servlet</groupId>
             <artifactId>javax.servlet-api</artifactId>
             <scope>provided</scope>
          </dependency>
          <dependency>
             <groupId>javax.servlet</groupId>
             <artifactId>jstl</artifactId>
          </dependency>
          
          <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-tomcat</artifactId>
          </dependency>
          
          <dependency>
             <groupId>org.apache.tomcat.embed</groupId>
             <artifactId>tomcat-embed-jasper</artifactId>
             <scope>provided</scope>
          </dependency>
       </dependencies>
    
       <build>
          <plugins>
             <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
          </plugins>
          <resources>
             <resource>
                <directory>src/main/java</directory>
                <includes>
                   <include>**/*.xml</include>
                </includes>
             </resource>
             <resource>
                <directory>src/main/resources</directory>
                <includes>
                   <include>**/*.*</include>
                </includes>
             </resource>
             <resource>
                <directory>src/main/webapp</directory>
                <targetPath>META-INF/resources</targetPath>
                <includes>
                   <include>**/*.*</include>
                </includes>
             </resource>
          </resources>
       </build>
    
    </project>

#### 3. 新建webapp文件夹，与resources同级 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70]

#### 4. 新建JSP页面，此时发现New里面没有JSP页面。需要设置一下才会出现 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70 1]

#### 添加web ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70 2]

#### 选择已经添加的webapp ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70 3]

#### 此时webapp上有蓝色圆点，表示设置成功 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70 5]

#### 5.application.properties ####

server.port=8082
    
    #页面默认前缀目录 默认在webapp下有别的文件夹可以，以文件夹/往下加
    spring.mvc.view.prefix=/
    #页面默认后缀目录
    spring.mvc.view.suffix=.jsp``

### 简单Demo ###

#### 6.JspController.java ####

@Controller
    public class JspController {
        
        @GetMapping("/boot/index")
        public String index(Model model){
        
            model.addAttribute("msg","Spring boot集成jsp");
            return "index";
        }
        @GetMapping("/boot/aaa")    
        public String aaa(Model model){
        
            model.addAttribute("sss","boot 整合jsp");
            return "aaa";
        }
    }

### 7.index.jsp ###

<%@
             pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Insert title here</title>
    </head>
    <body>
        <h1>Hello word</h1>
        ${msg}
    </body>
    </html>

#### 8.aaa.jsp ####

<%--
      Created by IntelliJ IDEA.
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    ${sss}
    </body>
    </html>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70 6]

#### 右键选择spring-boot:run启动项目即可。 ####

#### 浏览器效果 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70 7]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70 8]

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