WebApplicationType
为一个枚举类,主要有三个枚举值:
public enum WebApplicationType{
/**
* The application should not run as a web application and should not start an
* embedded web server.
*/
NONE,
/**
* The application should run as a servlet-based web application and should start an
* embedded servlet web server.
*/
SERVLET,
/**
* The application should run as a reactive web application and should start an
* embedded reactive web server.
*/
REACTIVE;
……
}
通过判断是否可以找到一些类来判断web应用的类型:
static WebApplicationType deduceFromClasspath() {
if (ClassUtils.isPresent(WEBFLUX_INDICATOR_CLASS, null)
&& !ClassUtils.isPresent(WEBMVC_INDICATOR_CLASS, null)
&& !ClassUtils.isPresent(JERSEY_INDICATOR_CLASS, null)) {
return WebApplicationType.REACTIVE;
}
for (String className : SERVLET_INDICATOR_CLASSES) {
if (!ClassUtils.isPresent(className, null)) {
return WebApplicationType.NONE;
}
}
return WebApplicationType.SERVLET;
}