java File文件操作共用方法整理

package org.jelly.util;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileReader;import java.io.FileWriter;import java.io.InputStream;import java.io.OutputStream;import java.io.StringReader;import java.util.ArrayList;import java.util.LinkedList;import java.util.List;import org.jelly.code.IndexCode;import org.jelly.exception.ExecutetimeException;/** * 文件常用的操作的工具类 * @since 1.0.0 */public class FileUtil {private FileUtil(){}private static final String LOCK = "_LOCK";private static final int BUFFER_SIZE = 1024 * 1024 / 2;/** * <des> 文件拷贝, 方法调用结束或抛出异常, 都将关闭输入输出流, 输出流flush </des> * @param in InputStream * @param out OutputStream * @since 1.0.0 */public static void copyFile(InputStream in, OutputStream out){try {byte[] buffer = new byte[BUFFER_SIZE];int read;while((read = in.read(buffer)) != IndexCode.EOF.toCode()){out.write(buffer, 0, read);}} catch (Throwable e) {throw new ExecutetimeException(e);} finally {closeStream(in, out);}}/** * <des> 写出, 方法调用结束或抛出异常, 都将关闭输入输出流, 输出流flush </des> * @since 1.6.0 */public static void write(InputStream in, OutputStream out){copyFile(in, out);}/** * <des> 字符串内容写出, 方法调用结束或抛出异常, 都将关闭输入输出流, 输出流flush </des> * @since 1.6.0 */public static void write(String text, OutputStream out){try {out.write(text.getBytes());} catch (Throwable e) {throw new ExecutetimeException(e);} finally {closeStream(out);}}/** * <des> 字符串内容写出到文件, 方法调用结束或抛出异常, 都将关闭输入输出流, 输出流flush </des> * @since 1.6.0 */public static void write(String text, File file){BufferedReader reader = null;BufferedWriter writer = null;try {reader = new BufferedReader(new StringReader(text));writer = new BufferedWriter(new FileWriter(file));char[] buffer = new char[BUFFER_SIZE];int read;while((read = reader.read(buffer)) != IndexCode.EOF.toCode()){writer.write(buffer, 0, read);}} catch (Throwable e) {throw new ExecutetimeException(e);} finally {closeStream(reader, writer);}}/** * <des> 读取获得文件内容 </des> * @param pathname 文件全路径名称 * @return 读取获得的文件内容 * @since 1.0.0 */public static String readFile(String pathname){return readFile(new File(pathname));}/** * <des> 读取获得文件内容 </des> * @param file 文件对象 * @return 读取获得的文件内容 * @since 1.0.0 */public static String readFile(File file){String[] contents = readLineFile(file);StringBuilder builder = new StringBuilder();for(String content : contents){builder.append(content);}return builder.toString();}/** * <des> 按行读取文件, 文件的每一行作为数组的一个元素 </des> * @param pathname 文件全路径名称 * @return 数组 * @since 1.0.0 */public static String[] readLineFile(String pathname){return readLineFile(new File(pathname));}/** * <des> 按行读取文件, 文件的每一行作为数组的一个元素 </des> * @param file 文件对象 * @return 数组 * @since 1.0.0 */public static String[] readLineFile(File file){BufferedReader reader = null;try {reader = new BufferedReader(new FileReader(file));LinkedList<String> list = new LinkedList<String>();String read;while((read = reader.readLine()) != null){list.add(read);}return ArrayUtil.asArray(list);} catch (Throwable e) {throw new ExecutetimeException(e);} finally {closeStream(reader);}}/** * <des> 获取目录下所有的文件对象 </des> * @param directory 文件目录对象 * @return 文件对象列表 * @since 1.0.0 */public static List<File> listFiles(File directory){return listFiles(directory, null);}/** * <des> 获取目录下所有由参数指定类型的文件对象 </des> * @param source 文件目录对象 * @param filter 期望得到的文件的后缀名称 * @return 文件对象列表 * @since 1.0.0 */public static List<File> listFiles(File source, String filter){File[] fileList = source.listFiles();List<File> list = new ArrayList<File>();filter = filter == null ? null : filter.toLowerCase();if(fileList != null && fileList.length > 0){for(File file : fileList){if(file.isFile()){add(list, file, filter);}else if(file.isDirectory()){list.addAll(listFiles(file, filter));}}}else if(source.isFile()){add(list, source, filter);}return list;}/** * <des> 在参数指定的目录中查找文件 </des> * @param dirpath 文件目录全路径名称 * @param filename 查找的文件名称 * @return 若查找的到, 则返还该文件对象, 若查找不到, 则返还null * @since 1.0.0 */public static File findFile(String dirpath, String filename){return findFile(new File(dirpath), filename);}/** * <des> 在参数指定的目录中查找文件 </des> * @param directory 文件目录对象 * @param filename 查找的文件名称 * @return 若查找的到, 则返还该文件对象, 若查找不到, 则返还null * @since 1.0.0 */public static File findFile(File directory, String filename){String filter = StringUtil.substringAfterLastWith(filename, ".");List<File> files = listFiles(directory, filter);if(files.size() == 0) return null;for(File file : files){if(file.getAbsolutePath().endsWith(filename)){return file;}}return null;}/** * <des> 删除文件或目录 </des> * @param file 文件或文件目录对象 * @since 1.0.0 */public static void delete(File file){synchronized (LOCK) {if(file.isFile()){file.delete();}else if(file.isDirectory()){File[] files = file.listFiles();for(File item : files){delete(item);}}file.delete();}}/** * <des> 创建目录 </des> * @param pathname 目录名称 * @return 若目录不存在则创建, 若存在则直接返还true * @since 1.0.0 */public static boolean createDir(String pathname){return createDir(new File(pathname));}/** * <des> 创建目录 </des> * @param dir 目录对象 * @return 若目录不存在则创建, 若存在则直接返还true * @since 1.0.0 */public static boolean createDir(File dir){synchronized (LOCK) {if(!dir.exists()){return dir.mkdirs();}return true;}}/** * <des> 获取FileInputStream实例 </des> * @since 1.0.0 */public static FileInputStream getFileInputStream(String pathname){return getFileInputStream(new File(pathname));}/** * <p><des> 获取FileInputStream实例 </des></p> * @since 1.0.0 */public static FileInputStream getFileInputStream(File file){try {return new FileInputStream(file);} catch (FileNotFoundException e) {throw new ExecutetimeException(e);}}/** * <p><des> 获取FileOutputStream实例 </des></p> * @since 1.0.0 */public static FileOutputStream getFileOutputStream(String pathname){return getFileOutputStream(new File(pathname), false);}/** * <p><des> 获取FileOutputStream实例 </des></p> * @since 1.0.0 */public static FileOutputStream getFileOutputStream(String pathname, boolean append){return getFileOutputStream(new File(pathname), append);}/** * <p><des> 获取FileOutputStream实例 </des></p> * @since 1.0.0 */public static FileOutputStream getFileOutputStream(File file){return getFileOutputStream(file, false);}/** * <p><des> 获取FileOutputStream实例 </des></p> * @since 1.0.0 */public static FileOutputStream getFileOutputStream(File file, boolean append){try {return new FileOutputStream(file, append);} catch (FileNotFoundException e) {throw new ExecutetimeException(e);}}// 添加文件到列表private static void add(List<File> list, File file, String filter){if(filter == null){list.add(file);}else if(file.getAbsolutePath().toLowerCase().endsWith(filter)){list.add(file);}}}