pom.xml 修改

首先把打包类型修改为: <packaging>war</packaging>

接着修改spring-boot-starter-tomcat为provided的scope, 避免打包到war中:

<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>

注意:

boot-start版本要高于1.3, 否则使用tomcat启动会出现异常.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
    <version>1.3.1.RELEASE</version>
</dependency>

部署到 Servlet 3.0 规范的容器

如果你的web容器支持Servlet 3.0规范, 可以使用以下的方法:

首先继承SpringBootServletInitializer, 并覆写configure方法, 不需要web.xml.

@Configuration
@EnableAutoConfiguration
@ComponentScan
public class Application extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        // Customize the application or call application.sources(...) to add sources
        // Since our example is itself a @Configuration class we actually don't
        // need to override this method.
        return application.sources(SampleControllerAndApp.class);
    }

}

部署到旧的容器 (Servlet 2.5)

如果你的容器不支持servlet 3.0规范怎么办 ? 下面是一个解决方法:

1
增加一个org.springframework.boot:spring-boot-legacy依赖
2
创建web.xml, 用以声明context listener, 这个listener是org.springframework.boot.legacy.context.web.SpringBootContextLoaderListener, 是在spring-boot下特别使用的, 其他配置和正常spring应用一样. web.xml 如下:


<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>demo.Application</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.boot.legacy.context.web.SpringBootContextLoaderListener</listener-class>
    </listener>

    <filter>
        <filter-name>metricFilter</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>metricFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextAttribute</param-name>
            <param-value>org.springframework.web.context.WebApplicationContext.ROOT</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

参考

howto-create-a-deployable-war-file
http://docs.spring.io/spring-boot/docs/current/maven-plugin/
http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#build-tool-plugins-maven-packaging