Spring-Boot Web工程內嵌了tomcat,默認情況下會把工程打成一個可執行的jar包。如果你希望打成war包,和其它web應用部署在外部的應用服務器(例如Jetty)上,那么需要我們修改pom.xml,并注冊spring boot的入口程序,即包含main()方法的類。
pom.xml的修改
pom.xml的修改包含兩個部分,一是把<packaging>jar</packaging>
改成<packaging>war</packaging>
, 二是把內嵌的tomcat排除掉。
<?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">
<!-- ... -->
<packaging>war</packaging>
<!-- ... -->
<dependencies>
<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>
<!-- ... -->
</dependencies>
</project>
注冊啟動類
創建ServletInitializer.java,繼承SpringBootServletInitializer ,覆蓋configure(),把啟動類Application注冊進去。外部web應用服務器構建Web Application Context的時候,會把啟動類添加進去。
public class ServletInitializer extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Application.class);
}
}
啟動類示例 Application.java
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}