SpringBoot 读取 jar包下resource中整个文件夹下内容,生成临时目录

static {
    try {
       copytReeourcesFileToTemp("classpath:static/xxx/", "*", System.getProperty("java.io.tmpdir") + "tempspring");
    } catch (Exception e) {
        e.printStackTrace();
    }
}
public static void copytReeourcesFileToTemp(String fileRoot, String regExpStr, String tempParent) throws Exception {
try {
ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
Resource[] resources = (Resource[]) resolver.getResources(fileRoot + regExpStr);
for (Resource resource : resources) {File newFile = new File(tempParent, resource.getFilename());
if (newFile.exists()) {
newFile.delete();
}
InputStream stream = null;
try {
stream = resource.getInputStream();
} catch (Exception e1) {
logger.debug(resource.getFilename() + "是文件夹");
}
if (stream == null) {logger.debug("创建文件夹" + resource.getFilename());
newFile.mkdirs();
Resource[] children = (Resource[]) resolver.getResources(fileRoot + resource.getFilename() + "/" + regExpStr);
for (Resource child : children) {
copytReeourcesFileToTemp(fileRoot + resource.getFilename() + "/", regExpStr, tempParent + "\\" + resource.getFilename());
}
} else {

if (!newFile.getParentFile().exists()) {
newFile.getParentFile().mkdir();
}
FileUtils.copyInputStreamToFile(stream, newFile);
}
}
} catch (Exception e) {
System.out.println("复制文件出现错误" + e.getMessage());
throw e;
}

}