Spring boot load resource path configuration and classpath problem solved

1. The default path of spring boot loading file:

1. /META-INF/resources/
2. /resources/
3. /static/
4. /public/

We can also see from the spring boot source code:

 private static final String[] CLASSPATH_RESOURCE_LOCATIONS = { "classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/" };

2. Classpath meaning

1. Store various resource configuration files eg.init.properties log4j.properties struts.xml
2. Store template file eg.actionerror.ftl
3. The class file is stored corresponding to the src directory compiled file during project development.

Summary: This is an entrance to locate resources

Classpath exists in general Java projects with WEB-INFO/directory.

When we need a certain class, the system will automatically search in CLASSPATH. If it is a jar, it will automatically search from the jar. If it is an ordinary directory, it will search according to the package under the directory.

But unlike PATH, the default CLASSPATH does not contain the current directory, which is also the reason why CLASSPATH needs to include a point.

The web application under Tomcat has two preset classpaths: WEB-INF/classes and WEB-INF/lib to start the project, and the project will load the data in these two directories. This is the specification of the war package. It is more troublesome to change the preset classpath. No similar configuration is found in the Tomcat configuration file. You must implement your own classloader to achieve your goal.

A web application running in tomcat. Its classpath includes the following directory:

What I know is:

1. %tomcat%/lib
2. web-inf/lib
3. web-inf/classes
   

classpath in environment variables

Summary: classpath is an entry to locate resources. The priority of lib under classpath is greater than classes;

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