package com.huaheng.common.utils.file; import javax.servlet.http.HttpServletRequest; import java.io.*; import java.net.URLEncoder; /** * 文件处理工具类 * * @author huaheng */ public class FileUtils { public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+"; /** * 输出指定文件的byte数组 * * @param filePath 文件路径 * @param os 输出流 * @return */ public static void writeBytes(String filePath, OutputStream os) throws IOException { FileInputStream fis = null; try { File file = new File(filePath); if (!file.exists()) { throw new FileNotFoundException(filePath); } fis = new FileInputStream(file); byte[] b = new byte[1024]; int length; while ((length = fis.read(b)) > 0) { os.write(b, 0, length); } } catch (IOException e) { throw e; } finally { if (os != null) { try { os.close(); } catch (IOException e1) { e1.printStackTrace(); } } if (fis != null) { try { fis.close(); } catch (IOException e1) { e1.printStackTrace(); } } } } /** * 删除文件 * * @param filePath 文件 * @return */ public static boolean deleteFile(String filePath) { boolean flag = false; File file = new File(filePath); // 路径为文件且不为空则进行删除 if (file.isFile() && file.exists()) { file.delete(); flag = true; } return flag; } /** * 文件名称验证 * * @param filename 文件名称 * @return true 正常 false 非法 */ public static boolean isValidFilename(String filename) { return filename.matches(FILENAME_PATTERN); } /** * 下载文件名重新编码 * * @param request 请求对象 * @param fileName 文件名 * @return 编码后的文件名 */ public static String setFileDownloadHeader(HttpServletRequest request, String fileName) throws UnsupportedEncodingException { final String agent = request.getHeader("USER-AGENT"); String filename = fileName; if (agent.contains("MSIE")) { // IE浏览器 filename = URLEncoder.encode(filename, "utf-8"); filename = filename.replace("+", " "); } else if (agent.contains("Firefox")) { // 火狐浏览器 filename = new String(fileName.getBytes(), "ISO8859-1"); } else if (agent.contains("Chrome")) { // google浏览器 filename = URLEncoder.encode(filename, "utf-8"); } else { // 其它浏览器 filename = URLEncoder.encode(filename, "utf-8"); } return filename; } }