Java multiple ways to obtain files under the project path

The target file is placed in the mytxt file under the resources folder of the project. The file name is file Test.txt:

In fact, you can see that after the project is run, this file is dropped into the target folder:

Get the InputStream of this file:

For example, we write a method to obtain the file stream in FileUtil,

public class FileUtil {
    

}

 

① getResourceAsStream

 String filePath = "/mytxt/fileTest.txt";
 InputStream inputStream = FileUtil.class.getResourceAsStream(filePath);

 

②  getResource + getPath

String filePath = "/mytxt/fileTest.txt";
String path = FileUtil.class.getResource(filePath).getPath();
InputStream fileInputStream = new FileInputStream(path);

 

③ getClassLoader().getResourceAsStream (note that the file path in this method does not initially have a / bar)

String filePath = "mytxt/fileTest.txt";
InputStream inputStream = FileUtil.class.getClassLoader().

getResourceAsStream(filePath);

 

④ Thread.currentThread().getContextClassLoader().getResource (note that in this way, the file path does not initially have a / bar)

String filePath = "mytxt/fileTest.txt";       
String path = Thread.currentThread().getContextClassLoader().

getResource(filePath ).getPath();
        InputStream fileInputStream = new FileInputStream(path);

⑤ System.getProperty first gets the project root path, and then splices target/classes and file path

String filePath = "/mytxt/fileTest.txt";
String relativelyPath = System.getProperty("user.dir");

InputStream fileInputStream = new FileInputStream(relativelyPath + "/target/classes/" + filePath);

 

⑥ Paths.get("").toAbsolutePath() First get the project root path, then splice target/classes and file path

String filePath = "/mytxt/fileTest.txt"; 
Path path = Paths.get("").toAbsolutePath();      
InputStream fileInputStream = new FileInputStream(path + "/target/classes/" + filePath);

Get the InputStream and do whatever you need to do. Well, that’s it for this article.