Outline, this article mainly introduces Spring Resource related
One: Resource related
Two: ResourceLoader related
Three: Resource ant loading mode related
One: Resource related
First, let's take a look at the commonly used methods of Resource:
Take a look at the class diagram of Resource:
From the above class diagram, we introduce some commonly used classes
UrlResource：
An implementation class for accessing network resources. Start with the following http: ftp: file: such as: http://myserver/logo.png
ClassPathResource：
Access the implementation class of the resource in the class loading path. The effect is similar to this.getClass().getResource("/").getPath();
FileSystemResource：
An implementation class for accessing resources in the file system. Such as: file:/data/config.xml
ServletContextResource：
Access the implementation class relative to the resource in the ServletContext path, the path must start with "/", such as: /WEB-INF/web.xml
The effect is similar to request.getServletContext().getRealPath("");
InputStreamResource：
An implementation class to access input stream resources.
ByteArrayResource：
An implementation class for accessing byte array resources.
Two: ResourceLoader related
ResourceLoader contains a Resource object, so its main function is the getResource() function.
It can be seen that ResourcePatternResolver encapsulates a layer on ResourceLoader, supports multi-resource loading, and it is worth mentioning that it also supports paths in Ant format.
Implementation class of ResourcePatternResolver:
Three: Resource ant loading mode related
Ant path wildcard supports "?", "*", "**", note that wildcard matching does not include the directory separator "/":
“?”：匹配一个字符，如“config?.xml”将匹配“config1.xml”；
“*”：匹配零个或多个字符串，如“cn/*/config.xml”将匹配“cn/javass/config.xml”，但不匹配匹配“cn/config.xml”；而“cn/config-*.xml”将匹配“cn/config-dao.xml”；
“**”：匹配路径中的零个或多个目录，如“cn/**/config.xml”将匹配“cn /config.xml”，也匹配“cn/javass/spring/config.xml”；而“cn/javass/config-**.xml”将匹配“cn/javass/config-dao.xml”，即把“**”当做两个“*”处理。
“classpath*:”用于加载所有匹配的类路径Resource