SpringBoot的Web开发入门案例8—支持jsp

新建springboot工程：springboot_jsp，打包方式为war
导入web模块：

生成的项目结构：

包含启动类SpringbootJspApplication：

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringbootJspApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringbootJspApplication.class, args);
	}

}

ServletInitializer类：

package com.example.demo;

import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

public class ServletInitializer extends SpringBootServletInitializer {

	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
		return application.sources(SpringbootJspApplication.class);
	}

}

pom.xml:

<?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 https://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>2.2.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>springboot_jsp</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<name>springboot_jsp</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<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>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

在pom文件中添加支持jsp的依赖：

<dependency>
	<groupId>org.apache.tomcat.embed</groupId>
	<artifactId>tomcat-embed-jasper</artifactId>
	<scope>provided</scope>
</dependency>

在 webapp 文件夹下新建 WEB-INF 文件夹，在 WEB-INF 下新建 test.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1>success</h1>
</body>
</html>

新建HelloController类

package com.example.demo.controller;

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

@Controller
public class HelloController {
	
	@GetMapping("/hello")
	public String hello() {
		return "test";
	}
}

application.properties文件：

server.port=9000
spring.mvc.view.prefix=/WEB-INF/
spring.mvc.view.suffix=.jsp

将项目添加到tomcat容器中，启动tomcat，访问路径：http://localhost:9000/springboot_jsp/hello，页面显示失败，再访问路径：http://localhost:8080/springboot_jsp/hello，页面成功显示：

这说明，使用外部tomcat时，在配置文件中配置的端口号server.port失效了。
修改test.jsp页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1>success</h1>
	<br>
	<a href="click">click</a>
</body>
</html>

新建second.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1>${msg }</h1>
</body>
</html>

新增请求：

@GetMapping("/click")
	public String click(Model model) {
		model.addAttribute("msg", "click---second.jsp");
		return "second";
	}

重启tomcat，请求http://localhost:8080/springboot_jsp/hello
点击click链接，跳转至second.jsp，从Model中传递过来的值可正常显示：

总结：

创建一个 springboot/maven 工程，打包方式为war包
要有一个ServletInitializer的类（继承SpringBootServletInitializer）
在pom文件中增加jsp的依赖，修改tomcat启动器的scope
调整目录结构，jsp页面要放在WEB-INF下，在application.properties/yml中配置页面的前后缀（视图解析）
启动服务时，使用的是外部的容器

BLUcoding

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SpringBoot的Web开发入门案例8—支持jsp

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