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t-io is a aio framework for java
/*
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package com.litongjava.tio.utils.hutool;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
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) {
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
// 获取全路径
String canonicalPath = null;
try {
canonicalPath = file.getCanonicalPath();
} catch (IOException e) {
throw new RuntimeException(e);
}
// 通过Files获取文件的输出流
try (OutputStream fos = Files.newOutputStream(Paths.get(canonicalPath));) {
fos.write(data);
fos.flush();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
/**
*
* @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) {
Path fileLocation = file.toPath();// Paths.get(file);
byte[] data = null;
try {
data = Files.readAllBytes(fileLocation);
} catch (IOException e) {
throw new RuntimeException(e);
}
return data;
}
public static String readString(File file) {
byte[] data = readBytes(file);
return new String(data);
}
public static String readUTF8String(File file) {
byte[] data = readBytes(file);
try {
return new String(data, "utf-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
/**
* 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);
}
public static StringBuilder readURLAsString(URL resource) {
if (resource == null) {
throw new RuntimeException();
}
StringBuilder text = new StringBuilder();
try (InputStream inputStream = resource.openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
char[] buffer = new char[1024];
int bytesRead;
while ((bytesRead = reader.read(buffer, 0, buffer.length)) != -1) {
text.append(buffer, 0, bytesRead);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
return text;
}
public static byte[] readUrlAsBytes(URL resource) {
if (resource == null) {
throw new RuntimeException("Resource not found");
}
try (InputStream inputStream = resource.openStream();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
byte[] buffer = new byte[1024 * 10];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
return outputStream.toByteArray();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
/**
* readURLAsLines
* @param resource
* @return
*/
public static List readURLAsLines(URL resource) {
try (InputStream inputStream = resource.openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
return reader.lines().collect(Collectors.toList());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}