Java文件操作类

import java.util.zip.*;

public class FileObj { private String message; private final long KB = 1024; private final long MB = 1024 * KB; private final long GB = 1024 * MB; // bt字节参考量 public static final long SIZE_BT = 1024L; // KB字节参考量 public static final long SIZE_KB = SIZE_BT * 1024L; // MB字节参考量 public static final long SIZE_MB = SIZE_KB * 1024L; // GB字节参考量 public static final long SIZE_GB = SIZE_MB * 1024L; // TB字节参考量 public static final long SIZE_TB = SIZE_GB * 1024L; public static final int SACLE = 2; // 文件大小属性 private long longSize; // 递归遍历文件目录计算文件大小 private void getFileSize(File file) { // 获得文件目录下文件对象数组 File[] fileArray = file.listFiles(); // 如果文件目录数组不为空或者length!=0,即目录为空目录 if (fileArray != null && fileArray.length != 0) { // 遍历文件对象数组 for (int i = 0; i < fileArray.length; i++) { File fileSI = fileArray[i]; // 如果是目录递归遍历 if (fileSI.isDirectory()) { // 递归遍历 getFileSize(fileSI); } // 如果是文件 if (fileSI.isFile()) { longSize += fileSI.length(); } } } else { // 如果文件目录数组为空或者length==0,即目录为空目录 longSize = 0; } } public void setMessage(String message) { this.message = message; }

/** * 读取文本文件内容 * * @param filePathAndName * 带有完整绝对路径的文件名 * @param encoding * 文本文件打开的编码方式 * @return 返回文本文件的内容 */ public String readTxt(String filePathAndName, String encoding) throws IOException { encoding = encoding.trim(); StringBuffer str = new StringBuffer(\"\"); String st = \"\"; try { FileInputStream fs = new FileInputStream(filePathAndName); InputStreamReader isr; if (encoding.equals(\"\")) { isr = new InputStreamReader(fs); } else { isr = new InputStreamReader(fs, encoding); } BufferedReader br = new BufferedReader(isr); try { String data = \"\"; while ((data = br.readLine()) != null) { str.append(data + \" \"); } } catch (Exception e) { str.append(e.toString()); } st = str.toString(); } catch (IOException es) { st = \"\"; } return st; } /** * 新建目录 * * @param folderPath * 目录 * @return 返回目录创建后的路径 */ public String createFolder(String folderPath) { String txt = folderPath; try { File myFilePath = new File(txt); txt = folderPath; if (!myFilePath.exists()) { myFilePath.mkdir(); } } catch (Exception e) {

}

message = \"创建目录操作出错\"; }

return txt;

/**

* 多级目录创建 *

* @param folderPath

* 准备要在本级目录下创建新目录的目录路径 例如 c:myf * @param paths

* 无限级目录参数，各级目录以单数线区分 例如 a|b|c * @return 返回创建文件后的路径 例如 c:myfa c */

public String createFolders(String folderPath, String paths) { String txts = }

folderPath; try { String txt; txts = folderPath; StringTokenizer st = new StringTokenizer(paths, \"|\"); for (int i = 0; st.hasMoreTokens(); i++) { txt = st.nextToken().trim(); if (txts.lastIndexOf(\"/\") != -1) { txts = createFolder(txts + txt); } else { txts = createFolder(txts + txt + \"/\"); } }

} catch (Exception e) { message = \"创建目录操作出错！\"; }

return txts;

/**

* 新建文件 *

* @param filePathAndName

* 文本文件完整绝对路径及文件名 * @param fileContent * 文本文件内容 * @return */ public void createFile(String filePathAndName, String fileContent) {

try { String filePath = filePathAndName; filePath = filePath.toString(); File myFilePath = new File(filePath); if (!myFilePath.exists()) { myFilePath.createNewFile(); } FileWriter resultFile = new FileWriter(myFilePath);

PrintWriter myFile = new PrintWriter(resultFile); String strContent = fileContent; myFile.println(strContent); myFile.close(); resultFile.close(); } catch (Exception e) { message = \"创建文件操作出错\"; } } /** * 有编码方式的文件创建 * * @param filePathAndName * 文本文件完整绝对路径及文件名 * @param fileContent * 文本文件内容 * @param encoding * 编码方式 例如 GBK 或者 UTF-8 * @return */ public void createFile(String filePathAndName, String fileContent, String encoding) { try { String filePath = filePathAndName; filePath = filePath.toString(); File myFilePath = new File(filePath); if (!myFilePath.exists()) { myFilePath.createNewFile(); } PrintWriter myFile = new PrintWriter(myFilePath, encoding); String strContent = fileContent; myFile.println(strContent); myFile.close(); } catch (Exception e) { message = \"创建文件操作出错\"; } } /** * 删除文件 * * @param filePathAndName * 文本文件完整绝对路径及文件名 * @return Boolean 成功删除返回true,遇异常返回false */ public boolean delFile(String filePathAndName) { boolean bea = false; try { String filePath = filePathAndName; File myDelFile = new File(filePath); if (myDelFile.exists()) { myDelFile.delete();

}

bea = true; } else { bea = false; message = (filePathAndName + \"删除文件操作出错\"); }

} catch (Exception e) { message = e.toString(); }

return bea;

/**

* 删除文件夹 *

* @param folderPath

* 文件夹完整绝对路径 * @return */

public void delFolder(String folderPath) { LinkedList folderList = new LinkedList(); folderList.add(folderPath); while (folderList.size() > 0) { File file = new File((String) folderList.poll()); File[] files = file.listFiles(); ArrayList fileList = new ArrayList(); for (int i = 0; i < files.length; i++) { if (files[i].isDirectory()) { folderList.add(files[i].getPath()); } else { fileList.add(files[i]); } } for (File f : fileList) { f.delete(); } } folderList = new LinkedList(); folderList.add(folderPath); while (folderList.size() > 0) { File file = new File((String) folderList.getLast()); if (file.delete()) { folderList.removeLast(); } else { File[] files = file.listFiles(); for (int i = 0; i < files.length; i++) { folderList.add(files[i].getPath()); } } } }

/**

* 删除指定文件夹下所有文件 *

* @param path

* 文件夹完整绝对路径

* @return * @return */ public boolean delAllFile(String path) { boolean bea = false; File file = new File(path); if (!file.exists()) { return bea; } if (!file.isDirectory()) { return bea; } String[] tempList = file.list(); File temp = null; for (int i = 0; i < tempList.length; i++) { if (path.endsWith(File.separator)) { temp = new File(path + tempList[i]); } else { temp = new File(path + File.separator + tempList[i]); } if (temp.isFile()) { temp.delete(); } if (temp.isDirectory()) { delAllFile(path + \"/\" + tempList[i]);// 先删除文件夹里面的文件 delFolder(path + \"/\" + tempList[i]);// 再删除空文件夹 bea = true; } } return bea; } /** * 复制单个文件 * * @param oldPathFile * 准备复制的文件源 * @param newPathFile * 拷贝到新绝对路径带文件名 * @return */ public void copyFile(String oldPathFile, String newPathFile) { try { int bytesum = 0; int byteread = 0; File oldfile = new File(oldPathFile); if (oldfile.exists()) { // 文件存在时 InputStream inStream = new FileInputStream(oldPathFile); // 读入原文件 FileOutputStream fs = new FileOutputStream(newPathFile); byte[] buffer = new byte[10240]; while ((byteread = inStream.read(buffer)) != -1) {

bytesum += byteread; // 字节数 文件大小 System.out.println(bytesum); fs.write(buffer, 0, byteread); } inStream.close(); } } catch (Exception e) { message = (\"复制单个文件操作出错\"); } } /** * 复制整个文件夹的内容 * * @param oldPath * 准备拷贝的目录 * @param newPath * 指定绝对路径的新目录 * @return */ public void copyFolder(String oldPath, String newPath) { try { new File(newPath).mkdirs(); // 如果文件夹不存在 则建立新文件夹 File a = new File(oldPath); String[] file = a.list(); File temp = null; for (int i = 0; i < file.length; i++) { if (oldPath.endsWith(File.separator)) { temp = new File(oldPath + file[i]); } else { temp = new File(oldPath + File.separator + file[i]); } if (temp.isFile()) { FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream(newPath + \"/\" + (temp.getName()).toString()); byte[] b = new byte[10240]; int len; while ((len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); } if (temp.isDirectory()) {// 如果是子文件夹 copyFolder(oldPath + \"/\" + file[i], newPath + \"/\" + file[i]); } }

}

} catch (Exception e) { message = \"复制整个文件夹内容操作出错\"; }

/**

* 移动文件 *

* @param oldPath * @param newPath * @return */

public void moveFile(String oldPath, String newPath) { copyFile(oldPath, newPath); delFile(oldPath); }

/**

* 移动目录 *

* @param oldPath * @param newPath * @return */

public void moveFolder(String oldPath, String newPath) { copyFolder(oldPath, newPath); delFolder(oldPath); }

/**

* 清空文件夹 *

* @param folderPath * @return */

public void cleanFolder(String folderPath) { File delfilefolder = new File(folderPath); if (!delfilefolder.exists() && !delfilefolder.delete()) { LinkedList folderList = new LinkedList(); folderList.add(delfilefolder.getAbsolutePath()); while (folderList.size() > 0) { File file = new File((String) folderList.poll()); File[] files = file.listFiles(); ArrayList fileList = new ArrayList(); for (int i = 0; i < files.length; i++) { if (files[i].isDirectory()) { folderList.add(files[i].getPath()); } else { fileList.add(files[i]); } } for (File f : fileList) { f.delete(); } } folderList = new LinkedList();

folderList.add(delfilefolder.getAbsolutePath()); while (folderList.size() > 0) { File file = new File((String) folderList.getLast()); if (file.delete()) { folderList.removeLast(); } else { File[] files = file.listFiles(); for (int i = 0; i < files.length; i++) { folderList.add(files[i].getPath()); } } } } delfilefolder.mkdir(); } /** * 计算文件大小 * * @param filePath * @return String */ public String fileSize(String filePath) { // 文件属性 File file = new File(filePath); // 如果文件存在而且是文件，直接返回文件大小 if (file.exists() && file.isFile()) { long filesize = file.length(); String showsize; if (filesize >= GB) showsize = filesize / GB + \" GB\"; else if (filesize >= MB) showsize = filesize / MB + \" MB\"; else if (filesize >= KB) showsize = filesize / KB + \" KB\"; else if (filesize > 1) showsize = filesize / GB + \" Bytes\"; else showsize = \"1 Byte\"; return showsize; } return null; } /** * 计算文件夹的大小 * * @param folderPath * @return String * @throws IOException * @throws RuntimeException */ public String folderSize(String folderPath) { // 文件存在而且是目录，递归遍历文件目录计算文件大小 File file = new File(folderPath);

if (file.exists() && file.isDirectory()) { getFileSize(file);// 递归遍历 } if (longSize == 1) { return \"1 Byte\"; } else if (longSize >= 2 && longSize < SIZE_BT) { return longSize + \" Bytes\"; } else if (longSize >= SIZE_BT && longSize < SIZE_KB) { return longSize / SIZE_BT + \" KB\"; } else if (longSize >= SIZE_KB && longSize < SIZE_MB) { return longSize / SIZE_KB + \" MB\"; } else if (longSize >= SIZE_MB && longSize < SIZE_GB) { BigDecimal longs = new BigDecimal(Double.valueOf(longSize + \"\") .toString()); BigDecimal sizeMB = new BigDecimal(Double.valueOf(SIZE_MB + \"\") .toString()); String result = longs.divide(sizeMB, SACLE, BigDecimal.ROUND_HALF_UP).toString(); // double result=longSize/(double)SIZE_MB; return result + \" GB\"; } else { BigDecimal longs = new BigDecimal(Double.valueOf(longSize + \"\") .toString()); BigDecimal sizeMB = new BigDecimal(Double.valueOf(SIZE_GB + \"\") .toString()); String result = longs.divide(sizeMB, SACLE, BigDecimal.ROUND_HALF_UP).toString(); return result + \" TB\"; } } /** * 以一个文件夹的框架在另一个目录创建文件夹和空文件 * * @param oldPath * @param newPath * @return */ public void buildPath(String oldPath, String newPath) { boolean b = false;// 不创建空文件 List folderList = new ArrayList(); folderList.add(oldPath); List folderList2 = new ArrayList(); folderList2.add(newPath); for (int j = 0; j < folderList.size(); j++) { (new File(folderList2.get(j))).mkdirs(); // 如果文件夹不存在 则建立新文件夹 File folders = new File(folderList.get(j)); String[] file = folders.list(); File temp = null; try { for (int i = 0; i < file.length; i++) {

if

(folderList.get(j).endsWith(File.separator)) { temp = new File(folderList.get(j), file[i]); } else { temp = new File(folderList.get(j), file[i]); } if (temp.isFile()) { if (b) temp.createNewFile(); } else if (temp.isDirectory()) {// 如果是子文件夹 folderList.add(folderList.get(j) + File.separator + file[i]); folderList2.add(folderList2.get(j) + File.separator + file[i]); } } } catch (IOException e) { // 复制整个文件夹内容操作出错 e.printStackTrace(); } } } /** * 对目标压缩文件解压缩到指定文件夹 * * @param filePath * @param folderPath * @return */ public void unzipFolder(String filePath, String folderPath) { File myFolderPath = new File(folderPath); try { if (!myFolderPath.exists()) { myFolderPath.mkdir(); } } catch (Exception e) { // 新建目录操作出错 e.printStackTrace(); return; } try { ZipInputStream in = new ZipInputStream( new FileInputStream(filePath)); ZipEntry entry = null; while ((entry = in.getNextEntry()) != null) { String entryName = entry.getName(); File file = new File(folderPath, entryName); if (entry.isDirectory()) { file.mkdirs(); } else {

FileOutputStream os = new FileOutputStream(file); // Transfer bytes from the ZIP file to the output // file byte[] buf = new byte[10240]; int len; while ((len = in.read(buf)) > 0) { os.write(buf, 0, len); } os.close(); in.closeEntry(); } } } catch (IOException e) { e.printStackTrace(); } } /** * 提取扩展名 * * @param filePath * 目录 * @return */ public String GetExt(String filePath) { if (filePath.indexOf('.') > 0) return filePath.substring(filePath.lastIndexOf('.')); else return \"\"; } /** * 提取文件名 * * @param filePath * 目录 * @return */ public String GetFileName(String filePath) { if (filePath.indexOf('\\\\') > 0) return filePath.substring(filePath.lastIndexOf(\"\\\\\") + 1); else return \"\"; } /** * 提取文件路径 * * @param filePath * 目录 * @return */ public String GetDirName(String filePath) {

if (filePath.indexOf('\\\\') > 0) return filePath.substring(0, filePath.lastIndexOf(\"\\\\\")); else return \"\"; } /** * 磁盘剩余空间计算 * * @param disk * @return long */ public long diskFreeSpace(String disk) { File file = new File(disk); return file.getFreeSpace(); } public String getMessage() { return this.message; } }