二、SpringBoot整合JSP

二、SpringBoot整合JSP

JSP Limitations

When running a Spring Boot application that uses an embedded servlet container (and is packaged as an executable archive), there are some limitations in the JSP support.

* With Jetty and Tomcat, it should work if you use war packaging. An executable war will work when launched with java -jar, and will also be deployable to any standard container. JSPs are not supported when using an executable jar.

* Undertow does not support JSPs.

* Creating a custom error.jsp page does not override the default view for error handling. Custom error pages should be used instead.

JSP限制:SpringBoot默认支持的视图并非JSP,而是诸如Thymeleaf等模板,但有些时候,我们还是想要使用JSP页面,那么我们也以这么做

在上一个工程的基础上

①,修改pom.xml,添加如下红色部分标注的内容

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 4     <modelVersion>4.0.0</modelVersion>
 5     <parent>
 6         <groupId>org.springframework.boot</groupId>
 7         <artifactId>spring-boot-starter-parent</artifactId>
 8         <version>2.1.4.RELEASE</version>
 9         <relativePath/> <!-- lookup parent from repository -->
10     </parent>
11     <groupId>com.hnnz</groupId>
12     <artifactId>demo</artifactId>
13     <version>0.0.1-SNAPSHOT</version>
14     <name>SpringBootDemo</name>
15     <description>Demo project for Spring Boot</description>
16  
17  
18     <properties>
19         <java.version>1.8</java.version>
20     </properties>
21  
22  
23     <dependencies>
24         <dependency>
25             <groupId>org.springframework.boot</groupId>
26             <artifactId>spring-boot-starter-web</artifactId>
27         </dependency>
28  
29  
30         <dependency>
31             <groupId>org.springframework.boot</groupId>
32             <artifactId>spring-boot-starter-test</artifactId>
33             <scope>test</scope>
34         </dependency>
35  
36  
37         <!-- Compile -->
38         <dependency>
39             <groupId>javax.servlet</groupId>
40             <artifactId>jstl</artifactId>
41         </dependency>
42         <!-- Provided -->
43         <dependency>
44             <groupId>org.springframework.boot</groupId>
45             <artifactId>spring-boot-starter-tomcat</artifactId>
46             <scope>provided</scope>
47         </dependency>
48         <dependency>
49             <groupId>org.apache.tomcat.embed</groupId>
50             <artifactId>tomcat-embed-jasper</artifactId>
51             <scope>provided</scope>
52         </dependency>
53     </dependencies>
54  
55     <build>
56         <plugins>
57             <plugin>
58                 <groupId>org.springframework.boot</groupId>
59                 <artifactId>spring-boot-maven-plugin</artifactId>
60             </plugin>
61         </plugins>
62     </build>
63  
64  
65 </project>

这些是使用jsp的必备组件

②,在application.propertites中添加以下内容

1 spring.mvc.view.prefix: /WEB-INF/jsp/
2 spring.mvc.view.suffix: .jsp

与SpringMVC类似的,他们代表视图的前缀与后缀

③在java文件夹下新建文件夹webapp/WEB-INF/jsp,在jsp文件夹下新建index.jsp,目录结构如图所示:

在index.jsp里添加任意内容,例如:

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8" isELIgnored="false" %>
 2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 3 <html xmlns="http://www.w3.org/1999/xhtml">
 4 <head>
 5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 6     <title>error页面</title>
 7 </head>
 8 <body>
 9      Hello,Spring Boot!
10 </body>
11 </html>

④,修改HelloController

 1 package com.hnnz.demo.controller;
 2  
 3  
 4 import org.springframework.stereotype.Controller;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 import org.springframework.web.bind.annotation.ResponseBody;
 7 import org.springframework.web.bind.annotation.RestController;
 8  
 9  
10 @Controller
11 public class HelloController {
12  
13  
14     @RequestMapping("/hello")
15     @ResponseBody
16     public String hello(){
17         return "Hello,Spring!";
18     }
19  
20  
21     @RequestMapping("/index")
22     public String index() {
23         return "index";
24     }
25  
26 }

修改类注解@RestController为@Controller,使此类下的方法返回值不再是字符串,而是视图
当我们仍需要使一个方法返回字符串时,我们可以再为这个方法添加@ResponseBody注解

⑤,启动SpringBootDemoApplication的主方法,访问 http://localhost:8080/index 浏览器返回的视图如下:

二、SpringBoot整合JSP

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