用STS打包成war部署到tomcat运行的注意事项
没及时记录下来，又踩坑了，而且是很基础的 -_-!
注意事项1：自定义一个类继承自SpringBootServletInitializer
比如：
package com.sleepingbug.hello;
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(HelloApplication.class);
}
}
说明：HelloApplication是创建Hello工程时自动生成的类
注意事项2：修改pom.xml，指明spring boot的版本
（我用的是比较旧的了，本文末尾会给上完整的pom.xml文件内容）
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
注意事项3：修改pom.xml，指明打包方式war
<packaging>war</packaging>
注意事项4：修改pom.xml，指明JDK版本
<properties>
<java.version>1.8</java.version>
<!-- Howard 2019-03-07 set complier version -->
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
注意事项5：修改pom.xml，指明使用外部tomcat
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
注意事项6：包含Maven依赖库
注意事项7：工程右键菜单有三个点的 [Mave Build ...] 来打包，打包参数如下图
Goals要填写"package"，
Profiles要删掉原来自动填的"pom.xml"，保持空白；
勾选Skip Tests
最后可以打包出来，就可以丢到tomcat的webapps目录下运行了。
末了，附上，整个pom.xml的内容
<?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>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.emeet</groupId>
<artifactId>hello</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>Hello</name>
<description>Hello from SleepingBug</description>
<properties>
<java.version>1.8</java.version>
<!-- Howard 2019-03-07 set complier version -->
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<!-- Howard 2019-03-13 use external tomcat -->
<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-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>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
</project>
