小编给大家分享一下Java中文件操作工具类fileUtil的示例分析，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
具体如下：
package com.gcloud.common;import java.io.*;import java.net.MalformedURLException;import java.net.URL;public class FileUtil { public static String readFile(InputStream is) { BufferedReader br = null; StringBuffer sb = new StringBuffer(); try { br = new BufferedReader(new InputStreamReader(is, "UTF-8")); String readLine = null; while ((readLine = br.readLine()) != null) { sb.append(readLine); } } catch (Exception e) { e.printStackTrace(); } finally { try { br.close(); is.close(); } catch (IOException e) { e.printStackTrace(); } } return sb.toString(); } public static boolean isFileExist(String fileName) { return new File(fileName).isFile(); } public static boolean makeDirectory(File file) { File parent = file.getParentFile(); if (parent != null) { return parent.mkdirs(); } return false; } public static URL getURL(File file) throws MalformedURLException { String fileURL = "file:/" + file.getAbsolutePath(); URL url = new URL(fileURL); return url; } public static String getFileName(String filePath) { File file = new File(filePath); return file.getName(); } public static String getFilePath(String fileName) { File file = new File(fileName); return file.getAbsolutePath(); } public static String toUNIXpath(String filePath) { return filePath.replace("", "/"); } public static String getUNIXfilePath(String fileName) { File file = new File(fileName); return toUNIXpath(file.getAbsolutePath()); } public static String getFileExt(String fileName) { int point = fileName.lastIndexOf('.'); int length = fileName.length(); if (point == -1 || point == length - 1) { return ""; } else { return fileName.substring(point + 1, length); } } public static String getNamePart(String fileName) { int point = getPathLastIndex(fileName); int length = fileName.length(); if (point == -1) { return fileName; } else if (point == length - 1) { int secondPoint = getPathLastIndex(fileName, point - 1); if (secondPoint == -1) { if (length == 1) { return fileName; } else { return fileName.substring(0, point); } } else { return fileName.substring(secondPoint + 1, point); } } else { return fileName.substring(point + 1); } } public static String getPathPart(String fileName) { int point = getPathLastIndex(fileName); int length = fileName.length(); if (point == -1) { return ""; } else if (point == length - 1) { int secondPoint = getPathLastIndex(fileName, point - 1); if (secondPoint == -1) { return ""; } else { return fileName.substring(0, secondPoint); } } else { return fileName.substring(0, point); } } public static int getPathLastIndex(String fileName) { int point = fileName.lastIndexOf("/"); if (point == -1) { point = fileName.lastIndexOf(""); } return point; } public static int getPathLastIndex(String fileName, int fromIndex) { int point = fileName.lastIndexOf("/", fromIndex); if (point == -1) { point = fileName.lastIndexOf("", fromIndex); } return point; } public static int getPathIndex(String fileName) { int point = fileName.indexOf("/"); if (point == -1) { point = fileName.indexOf(""); } return point; } public static int getPathIndex(String fileName, int fromIndex) { int point = fileName.indexOf("/", fromIndex); if (point == -1) { point = fileName.indexOf("", fromIndex); } return point; } public static String removeFileExt(String filename) { int index = filename.lastIndexOf("."); if (index != -1) { return filename.substring(0, index); } else { return filename; } } public static String getSubpath(String pathName, String fileName) { int index = fileName.indexOf(pathName); if (index != -1) { return fileName.substring(index + pathName.length() + 1); } else { return fileName; } } public static void deleteFile(String filename) throws IOException { File file = new File(filename); if (file.isDirectory()) { throw new IOException("IOException -> BadInputException: not a file."); } if (!file.exists()) { throw new IOException("IOException -> BadInputException: file is not exist."); } if (!file.delete()) { throw new IOException("Cannot delete file. filename = " + filename); } } public static void deleteDir(File dir) throws IOException { if (dir.isFile()) throw new IOException("IOException -> BadInputException: not a directory."); File[] files = dir.listFiles(); if (files != null) { for (int i = 0; i < files.length; i++) { File file = files[i]; if (file.isFile()) { file.delete(); } else { deleteDir(file); } } } dir.delete(); } public static void copy(File src, File dst) throws Exception { int BUFFER_SIZE = 4096; InputStream in = null; OutputStream out = null; try { in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE); out = new BufferedOutputStream(new FileOutputStream(dst), BUFFER_SIZE); byte[] buffer = new byte[BUFFER_SIZE]; int len = 0; while ((len = in.read(buffer)) > 0) { out.write(buffer, 0, len); } } catch (Exception e) { throw e; } finally { if (null != in) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } in = null; } if (null != out) { try { out.close(); } catch (IOException e) { e.printStackTrace(); } out = null; } } } public static void copy(File src, File dst, boolean append) throws Exception { int BUFFER_SIZE = 4096; InputStream in = null; OutputStream out = null; try { in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE); out = new BufferedOutputStream(new FileOutputStream(dst, append), BUFFER_SIZE); byte[] buffer = new byte[BUFFER_SIZE]; int len = 0; while ((len = in.read(buffer)) > 0) { out.write(buffer, 0, len); } } catch (Exception e) { throw e; } finally { if (null != in) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } in = null; } if (null != out) { try { out.close(); } catch (IOException e) { e.printStackTrace(); } out = null; } } }}以上是“Java中文件操作工具类fileUtil的示例分析”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注编程网行业资讯频道！
