这一篇文章介绍SpringBoot应用修改默认打jar形式部署为打war包形式，部署到外部Tomcat。

SpringBoot应用默认打包成为可执行jar模式让我们感觉到部署的便捷，接下来给大家介绍一下SpringBoot项目打War包形式部署到外部Tomcat。

修改原有项目

1.修改项目

打开项目，修改pom文件：
1.项目中加入spring-boot-starter-web（如果是已经加入该依赖的项目可以忽略）和spring-boot-starter-tomcat依赖。
2.packaging由jar修改为war。
3.在build内加入finalName，这个是设置打war包名称，可以不设置使用默认的。

完整pom文件如下：

<?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>

    <groupId>com.dalaoyang</groupId>
    <artifactId>springboot_tomcat</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>springboot_tomcat</name>
    <description>springboot_tomcat</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.15.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <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>
        </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>
        </dependency>
    </dependencies>

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

修改启动类，使其继承SpringBootServletInitializer类，重写configure方法，代码如下：

package com.dalaoyang;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.builder.SpringApplicationBuilder;import org.springframework.boot.web.support.SpringBootServletInitializer;@SpringBootApplicationpublic class SpringbootTomcatApplication  extends SpringBootServletInitializer {    public static void main(String[] args) {
        SpringApplication.run(SpringbootTomcatApplication.class, args);
    }    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {        return application.sources(SpringbootTomcatApplication.class);
    }
}

新建一个Controller，作为测试，代码如下:

package com.dalaoyang;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;/**
 * @author dalaoyang
 * @project springboot_learn
 * @package com.dalaoyang
 * @email yangyang@dalaoyang.cn
 * @date 2018/8/1
 */@RestControllerpublic class Controller  {    @GetMapping("/")    public String index(){        return "Hello , dalaoyang ";
    }
}

作者：dalaoyang
链接：https://www.jianshu.com/p/26b9aa803a61