java文件名工具类_扩展名、文件夹、文件等判断
唯一依赖org.apache.commons.lang.StringUtils请下载相关包
package com.wesley.framework.commen.io;import org.apache.commons.lang.StringUtils;/** * @author it.zl * */public class PathUtil {public static final String DOT = ".";public static final String SLASH_ONE = "/";public static final String SLASH_TWO = "\";/** * 获取没有扩展名的文件名 * @param fileName * @return */public static String getWithoutExtension(String fileName) {String ext = StringUtils.substring(fileName, 0,StringUtils.lastIndexOf(fileName, DOT));return StringUtils.trimToEmpty(ext);}/** * 获取扩展名 * @param fileName * @return */public static String getExtension(String fileName) {if (StringUtils.INDEX_NOT_FOUND == StringUtils.indexOf(fileName, DOT))return StringUtils.EMPTY;String ext = StringUtils.substring(fileName,StringUtils.lastIndexOf(fileName, DOT));return StringUtils.trimToEmpty(ext);}/** * 判断是否同为扩展名 * @param fileName * @param ext * @return */public static boolean isExtension(String fileName, String ext) {return StringUtils.equalsIgnoreCase(getExtension(fileName), ext);}/** * 判断是否存在扩展名 * @param fileName * @return */public static boolean hasExtension(String fileName) {return !isExtension(fileName, StringUtils.EMPTY);}/** * 得到正确的扩展名 * @param ext * @return */public static String trimExtension(String ext) {return getExtension(DOT + ext);}/** * 向path中填充扩展名(如果没有或不同的话) * @param fileName * @param ext * @return */public static String fillExtension(String fileName, String ext) {if (!hasExtension(fileName)) {return fileName + getExtension(ext);}if (!isExtension(fileName, ext)) {return getWithoutExtension(fileName) + getExtension(ext);}return fileName;}/** * 判断是否是文件PATH * @param fileName * @return */public static boolean isFile(String fileName) {return hasExtension(fileName);}/** * 判断是否是文件夹PATH * @param fileName * @return */public static boolean isFolder(String fileName) {return !hasExtension(fileName);}/** * 链接PATH前处理 * @param path * @return */public static String trimLeftPath(String path) {if (isFile(path))return path;path = StringUtils.trimToEmpty(path);String top = StringUtils.left(path, 1);if (StringUtils.equalsIgnoreCase(SLASH_ONE, top)|| StringUtils.equalsIgnoreCase(SLASH_TWO, top))return StringUtils.substring(path, 1);return path;}/** * 链接PATH后处理 * @param path * @return */public static String trimRightPath(String path) {if (isFile(path))return path;path = StringUtils.trimToEmpty(path);String bottom = StringUtils.right(path, 1);if (StringUtils.equalsIgnoreCase(SLASH_ONE, bottom)|| StringUtils.equalsIgnoreCase(SLASH_TWO, bottom))return StringUtils.substring(path, 0, path.length() - 2);return path + SLASH_ONE;}/** * 链接PATH前后处理，得到准确的链接PATH * @param path * @return */public static String trimPath(String path) {path = trimLeftPath(path);path = trimRightPath(path);return path;}/** * 通过数组完整链接PATH * @param paths * @return */public static String bulidFullPath(String... paths) {StringBuffer sb = new StringBuffer();for (String path : paths) {sb.append(trimPath(path));}return sb.toString();}public static void main(String[] args) {String fileName = "H:\\Intel\\Logs\\12312312.log";System.out.println(PathUtil.fillExtension(fileName, ".dit"));String[] paths = { "win", "t", "a", "teswe.te" };System.out.println(PathUtil.bulidFullPath(paths));}}?