使用外部容器运行spring-boot项目：不使用spring-boot内置容器让spring-boot项目运行在外部tomcat容器中

前言：本项目基于maven构建

spring-boot项目可以快速构建web应用，其内置的tomcat容器也十分方便我们的测试运行；

spring-boot项目需要部署在外部容器中的时候，spring-boot导出的war包无法再外部容器（tomcat）中运行或运行报错，本章就是详细讲解如何解决这个问题

1、pom.xml一览

<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>
<groupId>项目名称自行自行定义</groupId>
<artifactId>项目名称自行定义</artifactId>
<version>1.1.2-SNAPSHOT</version>
<packaging>war</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
</parent>
<dependencies>
<!-- spring-boot web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<!-- 排除内置容器，排除内置容器导出成war包可以让外部容器运行spring-boot项目-->
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>

</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-pool2 -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>

<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<!-- Package as an executable jar -->
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</pluginRepository>
</pluginRepositories>
</project>

2、排除org.springframework.boot依赖中的tomcat内置容器

注意：只有排除内置容器，才能让外部容器运行spring-boot项目

org.springframework.boot依赖中的排除项，测试时不要排除内置容器，会导致springboot无法测试运行，导出war包时再加上该项即可
<!-- spring-boot web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<!-- 排除内置容器，排除内置容器导出成war包可以让外部容器运行spring-boot项目-->
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>

3、实现SpringBootServletInitializer接口

spring-boot入口类必须实现SpringBootServletInitializer接口的configure方法才能让外部容器运行spring-boot项目

注意：SpringBootServletInitializer接口需要依赖 javax.servlet

package cn.eguid.Run;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;

import cc.eguid.livepush.PushManager;
import cc.eguid.livepush.PushManagerImpl;
import cn.eguid.livePushServer.redisManager.RedisMQHandler;

@SpringBootApplication
// 开启通用注解扫描
@ComponentScan
public class Application extends SpringBootServletInitializer {
/**
* 实现SpringBootServletInitializer可以让spring-boot项目在web容器中运行
*/
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
builder.sources(this.getClass());
return super.configure(builder);
}

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

}
}

总结：

外部容器运行spring-boot项目，只需要在原项目上做两件事

1、在pom.xml中排除org.springframework.boot的内置tomcat容器

2、spring-boot入口实现SpringBootServletInitializer接口

补充：SpringBootServletInitializer接口依赖javax.servlet包，需要在pom.xml中引入该包