> For the complete documentation index, see [llms.txt](https://jack80342.gitbook.io/spring-boot/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jack80342.gitbook.io/spring-boot/x.-appendices/e.-the-executable-jar-format/e.3.-launching-executable-jars.md).

# 附录E.3. 启动可执行Jars

`org.springframework.boot.loader.Launcher`类是个特殊的启动类，用于一个可执行jar的主要入口。它实际上就是你jar文件的`Main-Class`，并用来设置一个合适的`URLClassLoader`，最后调用你的`main()`方法。

这里有３个启动器子类（JarLauncher、WarLauncher和PropertiesLauncher）。它们的作用是从嵌套的jar或war文件目录中（相对于显示的从classpath）加载资源（.class文件等）。在`[Jar|War]Launcher`情况下，嵌套路径是固定的（`lib/*.jar`和war的`lib-provided/*.jar`），所以如果你需要很多其他jars只需添加到那些位置即可。PropertiesLauncher默认查找你应用存档的`lib/`目录，但你可以通过设置环境变量`LOADER_PATH`或application.properties中的`loader.path`来添加其他的位置（一个以逗号分隔的目录、存档或存档内的目录列表）。


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