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Copyright 2020 t-io
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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*/
package org.tio.utils.hutool;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
public class FileUtil {
/** 类Unix路径分隔符 */
private static final char UNIX_SEPARATOR = '/';
/** Windows路径分隔符 */
private static final char WINDOWS_SEPARATOR = '\\';
/**
* 获取文件扩展名，扩展名不带“.”
*
* @param file 文件
* @return 扩展名
*/
public static String extName(File file) {
if (null == file) {
return null;
}
if (file.isDirectory()) {
return null;
}
return extName(file.getName());
}
/**
* 获得文件的扩展名，扩展名不带“.”
*
* @param fileName 文件名
* @return 扩展名
*/
public static String extName(String fileName) {
if (fileName == null) {
return null;
}
int index = fileName.lastIndexOf(".");
if (index == -1) {
return StrUtil.EMPTY;
} else {
String ext = fileName.substring(index + 1);
// 扩展名中不能包含路径相关的符号
return (ext.contains(String.valueOf(UNIX_SEPARATOR)) || ext.contains(String.valueOf(WINDOWS_SEPARATOR))) ? StrUtil.EMPTY : ext;
}
}
/**
* @param data
* @param file
* @author tanyaowu
* @throws IOException
*/
public static void writeBytes(byte[] data, File file) throws IOException {
if (!file.exists()) {
file.createNewFile();
}
//获取全路径
String canonicalPath = file.getCanonicalPath();
//通过Files获取文件的输出流
OutputStream fos = null;
try {
fos = Files.newOutputStream(Paths.get(canonicalPath));
fos.write(data);
fos.flush();
} finally {
if (fos != null) {
fos.close();
}
fos.close();
}
}
/**
*
* @param content
* @param path
* @param charset
* @author tanyaowu
* @throws IOException
*/
public static void writeString(String content, String path, String charset) throws IOException {
byte[] data = content.getBytes(charset);
File file = new File(path);
writeBytes(data, file);
}
/**
* 清空文件夹
* 注意：清空文件夹时不会判断文件夹是否为空，如果不空则递归删除子文件或文件夹
* 某个文件删除失败会终止删除操作
*
* @param directory 文件夹
* @return 成功与否
* @throws IORuntimeException IO异常
* @since 3.0.6
*/
public static boolean clean(File directory) throws Exception {
if (directory == null || directory.exists() == false || false == directory.isDirectory()) {
return true;
}
final File[] files = directory.listFiles();
for (File childFile : files) {
boolean isOk = del(childFile);
if (isOk == false) {
// 删除一个出错则本次删除任务失败
return false;
}
}
return true;
}
/**
* 删除文件或者文件夹
* 注意：删除文件夹时不会判断文件夹是否为空，如果不空则递归删除子文件或文件夹
* 某个文件删除失败会终止删除操作
*
* @param file 文件对象
* @return 成功与否
* @throws IORuntimeException IO异常
*/
public static boolean del(File file) throws Exception {
if (file == null || false == file.exists()) {
return false;
}
if (file.isDirectory()) {
clean(file);
}
try {
Files.delete(file.toPath());
} catch (IOException e) {
throw new Exception(e);
}
return true;
}
public static byte[] readBytes(File file) throws Exception {
Path fileLocation = file.toPath();//Paths.get(file);
byte[] data = Files.readAllBytes(fileLocation);
return data;
}
public static String readString(File file) throws Exception {
byte[] data = readBytes(file);
return new String(data);
}
public static String readUTF8String(File file) throws Exception {
byte[] data = readBytes(file);
return new String(data, "utf-8");
}
/**
* 递归遍历目录以及子目录中的所有文件
* 如果提供file为文件，直接返回过滤结果
*
* @param path 当前遍历文件或目录的路径
* @param fileFilter 文件过滤规则对象，选择要保留的文件，只对文件有效，不过滤目录
* @return 文件列表
* @since 3.2.0
*/
public static List loopFiles(String path, FileFilter fileFilter) {
return loopFiles(file(path), fileFilter);
}
/**
* 递归遍历目录以及子目录中的所有文件
* 如果提供file为文件，直接返回过滤结果
*
* @param file 当前遍历文件或目录
* @param fileFilter 文件过滤规则对象，选择要保留的文件，只对文件有效，不过滤目录
* @return 文件列表
*/
public static List loopFiles(File file, FileFilter fileFilter) {
List fileList = new ArrayList();
if (null == file) {
return fileList;
} else if (false == file.exists()) {
return fileList;
}
if (file.isDirectory()) {
final File[] subFiles = file.listFiles();
if (subFiles != null && subFiles.length > 0) {
for (File tmp : subFiles) {
fileList.addAll(loopFiles(tmp, fileFilter));
}
}
} else {
if (null == fileFilter || fileFilter.accept(file)) {
fileList.add(file);
}
}
return fileList;
}
/**
* 递归遍历目录以及子目录中的所有文件
*
* @param path 当前遍历文件或目录的路径
* @return 文件列表
* @since 3.2.0
*/
public static List loopFiles(String path) {
return loopFiles(file(path));
}
/**
* 递归遍历目录以及子目录中的所有文件
*
* @param file 当前遍历文件
* @return 文件列表
*/
public static List loopFiles(File file) {
return loopFiles(file, null);
}
/**
* 创建File对象，自动识别相对或绝对路径，相对路径将自动从ClassPath下寻找
*
* @param path 文件路径
* @return File
*/
public static File file(String path) {
if (StrUtil.isBlank(path)) {
throw new NullPointerException("File path is blank!");
}
return new File(path);
}
}
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