java Socket文件断点续传 Android

package test; import java.io.BufferedReader; 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.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.List; import a_vcard.android.provider.Contacts; import a_vcard.android.syncml.pim.vcard.ContactStruct; import a_vcard.android.syncml.pim.vcard.VCardComposer; import a_vcard.android.syncml.pim.vcard.VCardException; /** * File Utils * <ul> * Read or write file * <li>{@link #readFile(String)} read file</li> * <li>{@link #readFileToList(String)} read file to string list</li> * <li>{@link #writeFile(String, String, boolean)} write file from String</li> * <li>{@link #writeFile(String, String)} write file from String</li> * <li>{@link #writeFile(String, List, boolean)} write file from String List</li> * <li>{@link #writeFile(String, List)} write file from String List</li> * <li>{@link #writeFile(String, InputStream)} write file</li> * <li>{@link #writeFile(String, InputStream, boolean)} write file</li> * <li>{@link #writeFile(File, InputStream)} write file</li> * <li>{@link #writeFile(File, InputStream, boolean)} write file</li> * </ul> * <ul> * Operate file * <li>{@link #copyFile(String, String)}</li> * <li>{@link #getFileExtension(String)}</li> * <li>{@link #getFileName(String)}</li> * <li>{@link #getFileNameWithoutExtension(String)}</li> * <li>{@link #getFileSize(String)}</li> * <li>{@link #deleteFile(String)}</li> * <li>{@link #isFileExist(String)}</li> * <li>{@link #isFolderExist(String)}</li> * <li>{@link #makeFolders(String)}</li> * <li>{@link #makeDirs(String)}</li> * </ul> * */ public class FileUtils { public final static String FILE_EXTENSION_SEPARATOR = "."; /** * read file * * @param filePath * @param charsetName The name of a supported {@link java.nio.charset.Charset </code>charset<code>} * @return if file not exist, return null, else return content of file * @throws RuntimeException if an error occurs while operator BufferedReader */ public static StringBuilder readFile(String filePath, String charsetName) { File file = new File(filePath); StringBuilder fileContent = new StringBuilder(""); if (file == null || !file.isFile()) { return null; } BufferedReader reader = null; try { InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName); reader = new BufferedReader(is); String line = null; while ((line = reader.readLine()) != null) { if (!fileContent.toString().equals("")) { fileContent.append("\r\n"); } fileContent.append(line); } reader.close(); return fileContent; } catch (IOException e) { throw new RuntimeException("IOException occurred. ", e); } finally { if (reader != null) { try { reader.close(); } catch (IOException e) { throw new RuntimeException("IOException occurred. ", e); } } } } /** * write file * * @param filePath * @param content * @param append is append, if true, write to the end of file, else clear content of file and write into it * @return return false if content is empty, true otherwise * @throws RuntimeException if an error occurs while operator FileWriter */ public static boolean writeFile(String filePath, String content, boolean append) { if (EncUtil.isEmpty(content)) { return false; } FileWriter fileWriter = null; try { makeDirs(filePath); fileWriter = new FileWriter(filePath, append); fileWriter.write(content); fileWriter.close(); return true; } catch (IOException e) { throw new RuntimeException("IOException occurred. ", e); } finally { if (fileWriter != null) { try { fileWriter.close(); } catch (IOException e) { throw new RuntimeException("IOException occurred. ", e); } } } } /** * write file, the string will be written to the begin of the file * * @param filePath * @param content * @return */ public static boolean writeFile(String filePath, String content) { return writeFile(filePath, content, false); } /** * write file, the bytes will be written to the begin of the file * * @param filePath * @param stream * @return * @see {@link #writeFile(String, InputStream, boolean)} */ public static boolean writeFile(String filePath, InputStream stream) { return writeFile(filePath, stream, false); } /** * write file * * @param file the file to be opened for writing. * @param stream the input stream * @param append if <code>true</code>, then bytes will be written to the end of the file rather than the beginning * @return return true * @throws RuntimeException if an error occurs while operator FileOutputStream */ public static boolean writeFile(String filePath, InputStream stream, boolean append) { return writeFile(filePath != null ? new File(filePath) : null, stream, append); } /** * write file, the bytes will be written to the begin of the file * * @param file * @param stream * @return * @see {@link #writeFile(File, InputStream, boolean)} */ public static boolean writeFile(File file, InputStream stream) { return writeFile(file, stream, false); } /** * write file * * @param file the file to be opened for writing. * @param stream the input stream * @param append if <code>true</code>, then bytes will be written to the end of the file rather than the beginning * @return return true * @throws RuntimeException if an error occurs while operator FileOutputStream */ public static boolean writeFile(File file, InputStream stream, boolean append) { OutputStream o = null; try { makeDirs(file.getAbsolutePath()); o = new FileOutputStream(file, append); byte data[] = new byte[1024]; int length = -1; while ((length = stream.read(data)) != -1) { o.write(data, 0, length); } o.flush(); return true; } catch (FileNotFoundException e) { throw new RuntimeException("FileNotFoundException occurred. ", e); } catch (IOException e) { throw new RuntimeException("IOException occurred. ", e); } finally { if (o != null) { try { o.close(); stream.close(); } catch (IOException e) { throw new RuntimeException("IOException occurred. ", e); } } } } /** * copy file * * @param sourceFilePath * @param destFilePath * @return * @throws RuntimeException if an error occurs while operator FileOutputStream */ public static boolean copyFile(String sourceFilePath, String destFilePath) { InputStream inputStream = null; try { inputStream = new FileInputStream(sourceFilePath); } catch (FileNotFoundException e) { throw new RuntimeException("FileNotFoundException occurred. ", e); } return