How Java uses the getClass().getResourceAsStream() method to obtain resource instance analysis

This article mainly introduces the relevant information about Java using the getClass().getResourceAsStream() method to obtain resources. Here we mainly explain which method can obtain file resources. Friends in need can refer to it

Java uses the getClass().getResourceAsStream() method to obtain resources

I wanted to obtain a resource file for some processing before, but could not get the file using getClass().getResourceAsStream(). Specific usage.

1 InputStream is = this.getClass().getResourceAsStream(fileName);  //拿不到资源
2 InputStream is = this.getClass().getResourceAsStream("/" + fileName); // 拿到资源
3 InputStream is = this.getClass().getClassLoader().getResourceAsStream(fileName); //拿到资源

The location of the specific files and code is that the code is in the src/main/java directory and the resource files are in the src/main/resources/ directory.

will be searched from the directory of the current class. If this file is not in the same directory as the class, it will not be found.

will be found from the entire compiled classes directory. Maven will also package the resource files into the classes folder, so it can be found.

ClassLoader is found from the entire classes folder, so there is no need to add / in front.

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