文件操作大全.docx

package com.example.picturehuancun;import java.io.BufferedInputStream;import java.io.BufferedWriter;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.RandomAccessFile;import java.util.Enumeration;import java.util.zip.ZipEntry;import java.util.zip.ZipFile;import java.util.zip.ZipInputStream;import java.util.zip.ZipOutputStream;import android.content.ContentResolver;import android.content.Context;import .Uri;import android.os.Environment;import android.os.ParcelFileDescriptor;public class FileHelper private static final int FILE_BUFFER_SIZE = 51200;/判断文件是否存在public static boolean fileIsExist(String filePath) if (filePath = null | filePath.length() 1) return false;File f = new File(filePath);if (!f.exists() return false;return true;/读取文件流public static InputStream readFile(String filePath) if (null = filePath) return null;InputStream is = null;try if (fileIsExist(filePath) File f = new File(filePath);is = new FileInputStream(f); else return null; catch (Exception ex) return null;return is;/创建public static boolean createDirectory(String filePath)if (null = filePath) return false;File file = new File(filePath);if (file.exists()return true;return file.mkdirs();/删除public static boolean deleteDirectory(String filePath) if (null = filePath) return false;File file = new File(filePath);if (file = null | !file.exists() return false;if (file.isDirectory() File list = file.listFiles();for (int i = 0; i list.length; i+) if (listi.isDirectory() deleteDirectory(listi.getAbsolutePath(); else listi.delete();file.delete();return true;/写入文件public static boolean writeFile(String filePath, InputStream inputStream) if (null = filePath | filePath.length() 1) return false;try File file = new File(filePath); if (file.exists() deleteDirectory(filePath); String pth = filePath.substring(0, filePath.lastIndexOf(/); boolean ret = createDirectory(pth); if (!ret) return false; boolean ret1 = file.createNewFile(); if (!ret) return false; FileOutputStream fileOutputStream = new FileOutputStream(file); byte buf = new byte1024;int c = inputStream.read(buf);while(-1 != c) fileOutputStream.write(buf, 0, c);c = inputStream.read(buf); fileOutputStream.flush();fileOutputStream.close();return true; catch (Exception e) e.printStackTrace();return false;public static boolean writeFile(String filePath, String fileContent) return writeFile(filePath, fileContent, false);public static boolean writeFile(String filePath, String fileContent, boolean append) if (null = filePath | fileContent = null | filePath.length() 1 | fileContent.length() 1) return false;try File file = new File(filePath); if (!file.exists() if (!file.createNewFile() return false; BufferedWriter output = new BufferedWriter(new FileWriter(file, append); output.write(fileContent); output.flush(); output.close(); catch (IOException ioe) return false;return true;/得到文件的大小public static long getFileSize(String filePath) if (null = filePath) return 0;File file = new File(filePath);if (file = null | !file.exists() return 0;return file.length();/得到文件的创建时间public static long getFileModifyTime(String filePath) if (null = filePath) return 0;File file = new File(filePath);if (file = null | !file.exists() return 0;return file.lastModified();/设置文件的时间public static boolean setFileModifyTime(String filePath, long modifyTime) if (null = filePath) return false;File file = new File(filePath);if (file = null | !file.exists() return false;return file.setLastModified(modifyTime);/复制文件public static boolean copyFile(ContentResolver cr, String fromPath, String destUri) if (null = cr | null = fromPath | fromPath.length() 1 | null = destUri | destUri.length() 1) return false;InputStream is = null;OutputStream os = null;try is = new FileInputStream(fromPath);if (null = is) return false;/ check output uriString path = null;Uri uri = null;String lwUri = destUri.toLowerCase();if (lwUri.startsWith(content:/) uri = Uri.parse(destUri); else if (lwUri.startsWith(file:/) uri = Uri.parse(destUri);path = uri.getPath(); else path = destUri;/ open output if (null != path) File fl = new File(path); String pth = path.substring(0, path.lastIndexOf(/); File pf = new File(pth); if (pf.exists() & !pf.isDirectory() pf.delete(); pf = new File(pth+File.separator); if (!pf.exists() if (!pf.mkdirs() pf = new File(path); if (pf.exists() if (pf.isDirectory() deleteDirectory(path); else pf.delete(); os = new FileOutputStream(path);fl.setLastModified(System.currentTimeMillis(); else os = new ParcelFileDescriptor.AutoCloseOutputStream(cr.openFileDescriptor(uri, w);/ copy filebyte dat = new byte1024;int i = is.read(dat);while(-1 != i) os.write(dat, 0, i);i = is.read(dat);is.close();is = null;os.flush();os.close();os = null;return true; catch(Exception ex) finally if(null != is) tryis.close(); catch(Exception ex) ;if(null != os) tryos.close(); catch(Exception ex) ;return false;/读取文件转换为二进制数据public static byte readAll(InputStream is) throws Exception ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);byte buf = new byte1024;int c = is.read(buf);while(-1 != c) baos.write(buf, 0, c);c = is.read(buf);baos.flush();baos.close();return baos.toByteArray(); public static byte readFile(Context ctx, Uri uri) if(null = ctx | null = uri) return null;InputStream is = null;String scheme = uri.getScheme().toLowerCase();if (scheme.equals(file) is = readFile(uri.getPath();try is = ctx.getContentResolver().openInputStream(uri);if(null = is) return null;byte bret = readAll(is);is.close(); is = null;return bret; catch(FileNotFoundException fne) catch(Exception ex) finally if (null != is) try is.close(); catch(Exception ex) ;return null;public static boolean writeFile(String filePath, byte content) if(null = filePath | null = content) return false;FileOutputStream fos = null;tryString pth = filePath.substring(0, filePath.lastIndexOf(/); File pf = null; pf = new File(pth); if(pf.exists() & !pf.isDirectory() pf.delete(); pf = new File(filePath); if(pf.exists() if(pf.isDirectory() FileHelper.deleteDirectory(filePath); else pf.delete(); pf = new File(pth+File.separator); if (!pf.exists() if (!pf.mkdirs() fos = new FileOutputStream(filePath);fos.write(content);fos.flush();fos.close(); fos = null;pf.setLastModified(System.currentTimeMillis();return true; catch(Exception ex) finally if(null != fos) try fos.close(); catch(Exception ex) ;return false;/zip文件/*ZIP file operation*/public static boolean readZipFile(String zipFileName, StringBuffer crc) try ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFileName);ZipEntry entry;while (entry = zis.getNextEntry() != null) long size = entry.getSize();crc.append(entry.getCrc() + , size: + size); zis.close(); catch (Exception ex) return false;return true;public static byte readGZipFile (String zipFileName) if (fileIsExist(zipFileName) try FileInputStream fin = new FileInputStream(zipFileName);int size;byte buffer = new byte1024;ByteArrayOutputStream baos = new ByteArrayOutputStream();while (size = fin.read(buffer, 0, buffer.length) != -1) baos.write(buffer, 0, size);return baos.toByteArray(); catch (Exception ex) return null;public static boolean zipFile(String baseDirName, String fileName, String targerFileName) throws IOException if (baseDirName = null | .equals(baseDirName) return false; File baseDir = new File(baseDirName); if (!baseDir.exists() | !baseDir.isDirectory() return false; String baseDirPath = baseDir.getAbsolutePath(); File targerFile = new File(targerFileName); ZipOutputStream out = new ZipOutputStream(new FileOutputStream(targerFile); File file = new File(baseDir, fileName); boolean zipResult = false; if (file.isFile() zipResult = fileToZip(baseDirPath, file, out); else zipResult = dirToZip(baseDirPath, file, out); out.close(); return zipResult; public static boolean unZipFile(String fileName, String unZipDir) throws Exception File f = new File(unZipDir);if (!f.exists() f.mkdirs();BufferedInputStream is = null;ZipEntry entry;ZipFile zipfile = new ZipFile(fileName);Enumeration enumeration = zipfile.entries();byte data = new byteFILE_BUFFER_SIZE;while (enumeration.hasMoreElements() entry = (ZipEntry)enumeration.nextElement();if (entry.isDirectory() File f1 = new File(unZipDir + / + entry.getName();if (!f1.exists() f1.mkdirs(); else is = new BufferedInputStream(zipfile.getInputStream(entry);int count;String name = unZipDir + / + entry.getName();RandomAccessFile m_randFile = null;File file = new File(name);if (file.exists() file.delete();file.createNewFile();m_randFile = new RandomAccessFile(file, rw);int begin = 0;while (count = is.read(data, 0, FILE_BUFFER_SIZE) != -1) try m_randFile.seek(begin); catch (Exception ex) m_randFile.write(data, 0, count);begin = begin + count;file.delete();m_randFile.close();is.close();return true;private static boolean fileToZip(String baseDirPath, File file, ZipOutputStream out) throws IOException FileInputStream in = null; ZipEntry entry = null; byte buffer = new byteFILE_BUFFER_SIZE; int bytes_read; try in = new FileInputStream(file); entry = new ZipEntry(getEntryName(baseDirPath, file); out.putNextEntry(entry); while (b