Java获取resources下文件路径的几种方法及遇到的问题

String filePath = "path/to/file.txt";
URL resourceUrl = getClass().getClassLoader().getResource(filePath);
String resourcePath = resourceUrl.getPath();

String filePath = "path/to/file.txt";
InputStream inputStream = getClass().getClassLoader().getResourceAsStream(filePath);

String filePath = "path/to/file.txt";
URL resourceUrl = getClass().getResource(filePath);
String resourcePath = resourceUrl.getPath();

String filePath = "path/to/file.txt";
InputStream inputStream = getClass().getResourceAsStream(filePath);

public String getResourcesPath(String filePath) {
        String resourcePath=null;
        try {
            Resource resource = new ClassPathResource(filePath);
            Path path = resource.getFile().toPath();
            resourcePath=path.toString();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return resourcePath;
    }

 public String getResourcesPath(String filePath) {
        String resourcePath=null;
        File file = new File(filePath);
        try {
            Resource resource = new ClassPathResource(filePath);
            InputStream inputStream = resource.getInputStream();
            FileUtils.copyInputStreamToFile(inputStream, file);
            resourcePath=file.getAbsolutePath();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return resourcePath;
    }