org.casbin.utils.FileUtils Maven / Gradle / Ivy
package org.casbin.utils;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
/**
* @author fangzhengjin
* @version V1.0
* @title: FileUtils
* @package org.casbin.utils
* @description:
* @date 2019/9/24 17:06
*/
public class FileUtils {
private final static Logger logger = LoggerFactory.getLogger(FileUtils.class);
private static String removePrefix(String str, String prefix) {
if (str.startsWith(prefix)) {
return str.substring(prefix.length());
}
return str;
}
public static File getFile(String filePath) {
File template = new File(removePrefix(filePath, "classpath:"));
if (template.exists()) {
return template;
} else {
return null;
}
}
public static InputStream getFileAsInputStream(String filePath) {
File file = getFile(filePath);
try {
if (file != null && file.exists()) {
return new FileInputStream(file);
}
Resource resource = new DefaultResourceLoader().getResource(filePath);
if (resource.exists()) {
return resource.getInputStream();
}
return null;
} catch (Exception e) {
logger.error("load file $filePath by inputStream error", e);
return null;
}
}
public static String getFileAsText(String filePath) {
try (InputStream inputStream = getFileAsInputStream(filePath);) {
if (inputStream != null) {
return IOUtils.toString(inputStream, StandardCharsets.UTF_8);
}
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
}