25.集成外部Tomcat的配置

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SpringBoot项目不使用内嵌的Tomcat，将项目打成war包，运行在外部的Tomcat中

1.创建项目

File -> New -> Spring Starter Project

2.项目文件

多出了文件ServletInitializer.java和webapps文件夹

ServletInitializer对外部Tomcat的支持

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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(Application.class);
	}

}

在webapps文件夹下创建文件index.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<c:forEach begin="1" end="10" var="num">
		${num }
	</c:forEach>
</body>
</html>

pom.xml添加对jstl的依赖和对外部Tomcat的支持

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<?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>2.7.0</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>11_springboot_tomcat</artifactId>
	<version>1.0</version>
	<packaging>war</packaging>
	<name>11_springboot_tomcat</name>
	<description>Spring Boot external tomcat</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-devtools</artifactId>
			<scope>runtime</scope>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-configuration-processor</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>

        <!-- 对外部Tomcat的支持 start -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
			<scope>provided</scope>
		</dependency>
        <!-- 对外部Tomcat的支持 end -->

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		
		<!-- 添加jstl的依赖 start -->
		<dependency>
		    <groupId>javax.servlet</groupId>
		    <artifactId>jstl</artifactId>
		</dependency>
		
		<dependency>
		    <groupId>taglibs</groupId>
		    <artifactId>standard</artifactId>
		    <version>1.1.2</version>
		</dependency>
		<!-- 添加jstl的依赖 end -->
		
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<excludes>
						<exclude>
							<groupId>org.projectlombok</groupId>
							<artifactId>lombok</artifactId>
						</exclude>
					</excludes>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>

3.项目打包

项目或pom.xml右键，Run As -> Maven install

在target目录下生成了相应的项目war包

4.运行项目

将生成的项目war包放入外部Tomcat的webapps目录下运行即可

浏览器访问: http://localhost:8080/11_springboot_tomcat-1.0/或http://localhost:8080/11_springboot_tomcat-1.0/index.jsp