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在本文中，将演示如何将Spring Boot WAR文件部署到Tomcat servlet容器中。

对于Spring Boot WAR部署，需要执行三个步骤：

1. 扩展SpringBootServletInitializer
2. 根据提供标记嵌入式servlet容器。
3. 更新包装为 War

测试工具：

• Spring Boot 1.4.2.RELEASE
• Tomcat 8.5.9
• Maven 3

注意
在Spring Boot中，具有嵌入服务器解决方案的最终可执行JAR文件可能不适合所有生产环境，特别是部署团队(具有良好的服务器优化和监控技能知识，但缺乏开发经验的团队)，他们希望完全控制服务器，并且不能接触代码。

1. 推展 SpringBootServletInitializer

使现有的 @SpringBootApplication 类扩展 SpringBootServletInitializer
1.1 - 经典Spring Boot JAR部署(更新此文件以支持WAR部署)。

SpringBootWebApplication.java 文件的内容如下 -

import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringBootWebApplication {public static void main(String[] args) throws Exception {SpringApplication.run(SpringBootWebApplication.class, args);}}

1.2 Spring Boot WAR 部署

SpringBootWebApplication.java 文件的内容如下 -

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;@SpringBootApplication
public class SpringBootWebApplication extends SpringBootServletInitializer {@Overrideprotected SpringApplicationBuilder configure(SpringApplicationBuilder application) {return application.sources(SpringBootWebApplication.class);}public static void main(String[] args) throws Exception {SpringApplication.run(SpringBootWebApplication.class, args);}}/*@SpringBootApplication
public class SpringBootWebApplication {public static void main(String[] args) throws Exception {SpringApplication.run(SpringBootWebApplication.class, args);}}*/

如果要为部署创建了一个额外的SpringBootWebApplication类，请确保告诉Spring Boot要从哪个主类开始启动程序：

在 pom.xml 文件中增加以下内容指定 -

<properties><start-class>com.yiibai.NewSpringBootWebApplicationForWAR</start-class>
</properties>

2.提供标记嵌入式servlet容器

在 pom.xml 文件中增加以下内容指定 -

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><!-- marked the embedded servlet container as provided --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-tomcat</artifactId><scope>provided</scope></dependency></dependencies>

3.更新包装为War
在 pom.xml 文件中增加以下内容指定 -

<packaging>war</packaging>

完成，mvn打包并将$project/target/xxx.war复制到Tomcat发布目录进行部署。

4. 完整的Spring Boot WAR + Tomcat部署

4.1 - 以Spring Boot Thymeleaf为例，更新它并手动部署到Tomcat。
4.2 - 更新现有的SpringBootWebApplication并让它扩展SpringBootServletInitializer类。

SpringBootWebApplication.java文件的完整代码如下所示 -

package com.yiibai;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;@SpringBootApplication
public class SpringBootWebApplication extends SpringBootServletInitializer {@Overrideprotected SpringApplicationBuilder configure(SpringApplicationBuilder application) {return application.sources(SpringBootWebApplication.class);}public static void main(String[] args) throws Exception {SpringApplication.run(SpringBootWebApplication.class, args);}}

4.3 - 更新打包包，并按提供的标记spring-boot-starter-tomcat。
pom.xml文件的完整代码如下所示 -

<?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><artifactId>spring-boot-web-thymeleaf</artifactId><packaging>war</packaging><name>Spring Boot Web Thymeleaf Example</name><description>Spring Boot Web Thymeleaf Example</description><url>http://www.yiibai.com</url><version>1.0</version><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.2.RELEASE</version></parent><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><!-- marked the embedded servlet container as provided --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-tomcat</artifactId><scope>provided</scope></dependency><!-- hot swapping, disable cache for template, enable live reload --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><optional>true</optional></dependency><!-- Optional, for bootstrap --><dependency><groupId>org.webjars</groupId><artifactId>bootstrap</artifactId><version>3.3.7</version></dependency></dependencies><build><plugins><!-- Package as an executable jar/war --><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project>

4.4 - 这是可选的，将contextPath更新为/yiibai以方便稍后作为演示。准备好WAR部署文件。

application.properties 文件的完整内容如下所示 -

welcome.message: Hello Yiibaiserver.contextPath=/yiibai

Bash

4.5 - 获取Tomcat并部署WAR文件，执行以下命令 -

F:\worksp\springboot\spring-boot-war-tomcat>mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Spring Boot Web Thymeleaf Example 1.0
[INFO] ------------------------------------------------------------------------
Downloading: http://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-thymeleaf/1.4.2.RELEASE/spring-boot-starter-thymeleaf-1.4.2.RELEASE.pom
Downloaded: http://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-thymeleaf/1.4.2.RELEASE/spring-boot-starter-thymeleaf-1.4.2.RELEASE.pom (2 KB at 0.7 KB/sec)
Downloading: http://repo.maven.apache.org/maven2/org/thymeleaf/thymeleaf-spring4/2.1.5.RELEASE/thymeleaf-spring4-2.1.5.RELEASE.pom
....
.... ...

将生成的 spring-boot-web-thymeleaf-1.0.war 拷贝到 Tomcat 发布目录下 -

例如，写本文章时，Tomcat 发布目录使用的是 -F:\worksp\springmvc\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\webapps

4.6 - 现在启动 Tomcat，访问：http://localhost:8080/yiibai/ ，程序没有错误问题，应该会看到以下结果 -