springboot嵌入式tomcat和tomcat-embed-jasper [英] springboot embedded tomcat and tomcat-embed-jasper

问题描述

我有时会在pom.xml中看到以下声明......

I sometimes see these following declaration in pom.xml...

   <dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
        <scope>provided</scope>
    </dependency>
    ....

如你所见，spring-boot-starter-web was声明为
为tomcat-embed-jasper。

as you can see, spring-boot-starter-web was declared as well as tomcat-embed-jasper.

是不是spring-boot-starter-web已经有嵌入式tomcat？
为什么有些开发人员仍然使用boot-starter-web声明tomcat-embed-jasper？或者有什么理由？

isn't it spring-boot-starter-web already have an embedded tomcat? why some developers still declare tomcat-embed-jasper along with boot-starter-web? or is there any reason?

推荐答案

如你所说， spring-boot-starter-web 包含 spring-boot-starter-tomcat 。您可以查看这里

As you said, the spring-boot-starter-web includes the spring-boot-starter-tomcat. You could check it here

spring-boot-starter-tomcat 包含 tomcat -embed芯。您可以查看这里

但是，似乎 tomcat-embed-core 不包括 Tomcat的嵌入-碧玉。实际上， tomcat-embed-jasper 包含与 tomcat-embed-core 的依赖关系。检查它 here

But, seems like tomcat-embed-core doesn't include tomcat-embed-jasper. In fact, is tomcat-embed-jasper who includes dependency with tomcat-embed-core. Check it here

无论如何， tomcat-embed-jasper 标记为提供，表示您希望JDK或容器在运行时提供依赖项。此范围仅在编译和测试类路径中可用，并且不可传递。

Anyway, the tomcat-embed-jasper is marked as provided, so indicates that you expect the JDK or a container to provide the dependency at runtime. This scope is only available on the compilation and test classpath, and is not transitive.

总之， spring-boot-starter-web 包含tomcat嵌入式依赖项，但它不包含jasper嵌入式依赖项，因此应该单独声明它。

In conclusion, the spring-boot-starter-web includes the tomcat embedded dependency but it doesn't includes the jasper embedded dependency, so that should be the reason to declare it separately.

此外，请记住，使用Spring IO Platform作为父级，您可以轻松地管理依赖项。要了解更多信息，请阅读我的帖子

Also, remember that using Spring IO Platform as parent you are able to manage dependencies easily. To know more about this you could read my post

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