springBoot项目打包war包部署到tomcat-蒲公英云

springBoot项目打包war包部署到tomcat

第一步：修改pom.xml

变成war包

<groupId>com.example</groupId>
    <artifactId>springdemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

排除org.springframework.boot依赖中的tomcat内置容器，这是很重要的一步

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

添加对servlet API的依赖

<!-- jsp支持开启 -->  
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>
        <!-- servlet支持开启 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>

继承SpringBootServletInitializer ，并覆盖它的 configure 方法,如下图代码，为什么需要提供这样一个SpringBootServletInitializer子类并覆盖它的config方法呢，我们看下该类原代码的注释:

/**Note that a WebApplicationInitializer is only needed if you are building a war file and
* deploying it. If you prefer to run an embedded container then you won’t need this at
* all.

如果我们构建的是war包并部署到外部tomcat则需要使用它，如果使用内置servlet容器则不需要，外置tomcat环境的配置需要这个类的configure方法来指定初始化资源。

@SpringBootApplication
@EnableAutoConfiguration
@MapperScan(basePackages = {"com.example.springdemo"})
public class SpringdemoApplication extends SpringBootServletInitializer {
    /**
     * 需要把web项目打成war包部署到外部tomcat运行时需要改变启动方式
     */
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(SpringdemoApplication.class);
    }
    // springboot运行后此方法首先被调用
    // 实现CommandLineRunner抽象类中的run方法
    public static void main(String[] args) {
        SpringApplication.run(SpringdemoApplication.class, args);
    }
}

如果像我一样在webapp的WEB-INF的lib下引入了第三方的jar包就还需要把第三方jar包加进来

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <configuration>
                    <webResources>
                        <resource>
                            <directory>src/main/webapp</directory>
                            <targetPath>WEB-INF/lib/</targetPath>
                            <includes>
                                <include>**/*.jar</include>
                            </includes>
                        </resource>
                    </webResources>
                </configuration>
            </plugin>
        </plugins>
    </build>