详解SpringBoot 添加对JSP的支持(附常见坑点)

序言:

SpringBoot默认不支持JSP,如果想在项目中使用,需要进行相关初始化工作。为了方便大家更好的开发,本案例可直接作为JSP开发的脚手架工程 SpringBoot+War+JSP .

常见问题:

1.修改JSP需重启才能生效:

在生产环境中,SpringBoot重新编译JSP可能会导致较大的性能损失,并且很难追查到问题根源,所以在最新的版本中,官方已经默认关闭此功能,详见JspServlet类的初始化参数。那么,如何解决这个问题呢?推荐两个解决办法:1.使用devtools 2. 添加配置(server.servlet.jsp.init-parameters.development=true)

2.各种404:

1.必须导入嵌入式容器和JASPER解析器 2.必须创建webapp目录

正文:SpringBoot 添加对JSP的支持

1. 搭建脚手架

首先使用 Spring Initializr 构建工程,其中源码和静态资源目录默认生成,这里只需手工添加Web资源目录。如图:

2. 在pom.xml 添加相关依赖

<?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">

<!--基本信息 -->

<modelVersion>4.0.0</modelVersion>

<groupId>com.hehe</groupId>

<artifactId>springboot-web-jsp</artifactId>

<version>0.0.1-SNAPSHOT</version>

<!--打包格式:SpringBoot使用JSP时需打包为war类型 -->

<packaging>war</packaging>

<!--继承父工程-->

<parent>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>2.0.0.M4</version>

<relativePath/>

</parent>

<!--依赖管理 -->

<dependencies>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</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>

</dependency>

<dependency>

<groupId>javax.servlet</groupId>

<artifactId>jstl</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-devtools</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-test</artifactId>

<scope>test</scope>

</dependency>

</dependencies>

<!--指定远程仓库(含插件) -->

<repositories>

<repository>

<id>spring-snapshots</id>

<url>http://repo.spring.io/snapshot</url>

<snapshots><enabled>true</enabled></snapshots>

</repository>

<repository>

<id>spring-milestones</id>

<url>http://repo.spring.io/milestone</url>

</repository>

</repositories>

<pluginRepositories>

<pluginRepository>

<id>spring-snapshots</id>

<url>http://repo.spring.io/snapshot</url>

</pluginRepository>

<pluginRepository>

<id>spring-milestones</id>

<url>http://repo.spring.io/milestone</url>

</pluginRepository>

</pluginRepositories>

<!--构建插件 -->

<build>

<plugins>

<plugin>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

</plugins>

</build>

</project>

3. 启动类添加Servlet支持

@SpringBootApplication

public class SpringbootWarJspApplication extends SpringBootServletInitializer {

@Override

protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {

return builder.sources(SpringbootWarJspApplication.class);

}

public static void main(String[] args) {

SpringApplication.run(SpringbootWarJspApplication.class, args);

}

}

4. 添加MVC映射

application.yml 配置如下:

spring:

mvc:

view:

prefix: /WEB-INF/views/ # Read From Web Resources Dir

suffix: .jsp

5. 编写JSP页面

在 WEB-INF/views 目录下新建一个JSP文件

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

<!DOCTYPE html>

<html>

<body>

<marquee><p style="font-size: 100px">Hello JSP !!</p>

![](${pageContext.servletContext.contextPath}/doge.gif)

</marquee>

</body>

</html>

6.启动项目

启动方式1:在IDE启动WebJspApplication,然后打开项目地址。

启动方式2:部署到外置Tomcat,启动完成后,打开项目地址。这里需要注意的是,使用外置Tomcat部署的时候,需要将嵌入式容器调整为provided级别。(防止冲突)

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-tomcat</artifactId>

<scope>provided</scope>

</dependency>

<dependency>

<groupId>org.apache.tomcat.embed</groupId>

<artifactId>tomcat-embed-jasper</artifactId>

<scope>provided</scope>

</dependency>

7.单元测试

@RunWith(SpringRunner.class)

@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)

@DirtiesContext

public class WebJspApplicationTest {

@Autowired

private TestRestTemplate restTemplate;

@Test

public void testJspWithEl() throws Exception {

ResponseEntity<String> entity = restTemplate.getForEntity("/", String.class);

assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);

assertThat(entity.getBody()).contains("Hello JSP");

}

}

全文至此,有疑问的小伙伴可在评论下方进行交流。

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