Java-FileUtil工具类

mac2022-06-30  107

import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.UnsupportedEncodingException; /** * 文件处理工具 */ public class FileUtils { /** * 將文件转为字节 * * @param filename * @return * @throws IOException */ public static byte[] toByteArray(String filename) throws IOException { File f = new File(filename); if (!f.exists()) { throw new FileNotFoundException(filename); } ByteArrayOutputStream bos = new ByteArrayOutputStream((int) f.length()); BufferedInputStream in = null; try { in = new BufferedInputStream(new FileInputStream(f)); int buf_size = 1024; byte[] buffer = new byte[buf_size]; int len = 0; while (-1 != (len = in.read(buffer, 0, buf_size))) { bos.write(buffer, 0, len); } return bos.toByteArray(); } catch (IOException e) { e.printStackTrace(); throw e; } finally { try { in.close(); } catch (IOException e) { e.printStackTrace(); } bos.close(); } } /** * InputStream 转为 byte[] * * @param inStream * @return * @throws IOException */ public static final byte[] inputStreamToByteArray(InputStream inStream) throws IOException { ByteArrayOutputStream swapStream = new ByteArrayOutputStream(); byte[] buff = new byte[100]; int rc = 0; while ((rc = inStream.read(buff, 0, 100)) > 0) { swapStream.write(buff, 0, rc); } byte[] in2b = swapStream.toByteArray(); return in2b; } /** * 文件类型 * * @param fileName * @return */ public static String getFileType(String fileName) { int start = 0; start = fileName.lastIndexOf("."); if (start <= 0) { return ""; } return "." + fileName.substring(start + 1); } /** * @param 文件路径 * @return 文件名 */ public static String getFileName(String filepath) { int start = 0; start = filepath.lastIndexOf("/"); if (start <= 0) { return ""; } return filepath.substring(start + 1); } public static int getFileSize(File file) { if (file.exists() && file.isFile()) { FileInputStream fis = null; try { fis = new FileInputStream(file); return fis.available() / 1024; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (fis != null) fis.close(); } catch (IOException e) { e.printStackTrace(); } } } return 0; } /** * 目的: 将String数据存为文件 。 * @param src * 字符串 * @param path * 文件保存路徑 * @return */ public static File saveFileFromStr(String src, String path) { byte[] b = src.getBytes(); BufferedOutputStream stream = null; File file = null; try { file = new File(path); FileOutputStream fstream = new FileOutputStream(file); stream = new BufferedOutputStream(fstream); stream.write(b); } catch (Exception e) { e.printStackTrace(); } finally { if (stream != null) { try { stream.close(); } catch (IOException e1) { e1.printStackTrace(); } } } return file; } /** * 目的: 将byte数据存为文件。 * @param b * byte数据 * @param path * 文件保存路径 * @return */ public static File saveFileFromBytes(byte[] b, String path) { BufferedOutputStream stream = null; File file = null; try { file = new File(path); FileOutputStream fstream = new FileOutputStream(file); stream = new BufferedOutputStream(fstream); stream.write(b); } catch (Exception e) { e.printStackTrace(); } finally { if (stream != null) { try { stream.close(); } catch (IOException e1) { e1.printStackTrace(); } } } return file; } /** * 目的:byte 转String 编码BASE64 。 * @param bstr * @return */ public static String encodeBASE64(byte[] bstr) { return new sun.misc.BASE64Encoder().encode(bstr); } /** * 目的:string 转 byte 解码BASE64 。 * @param str * @return */ public static byte[] decodeBASE64(String str) { byte[] bt = null; try { sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder(); bt =decoder.decodeBuffer(str); } catch (IOException e) { e.printStackTrace(); } return bt; } /** * 目的:byte[] 转为String * @param b * @return */ public static String byteToString(byte[] b){ try { return new String(b,"UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); return new String(b); } } /** * 目的:String 转为 byte[] 。 * @param b * @return */ public static byte[] stringTobyte(String str){ try { return str.getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); return str.getBytes(); } } }

转载于:https://www.cnblogs.com/bilaisheng/p/10211021.html

相关资源:Java文件处理工具类--FileUtil
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