FileUtil.java对文件做各种处理 保存获取下载文件 计算文件大小
FileUtil.java对文件做各种处理 保存获取下载文件 计算文件大小
上传文件 下载文件 计算文件大小 把文件传输到前台
package com.beisun.mbp.util; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.nio.channels.FileChannel; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.util.FileCopyUtils; import org.springframework.web.multipart.MultipartFile; public class FileUtil { /** * 上传文件 * @param filePath 上传文件目录 * @param fileName 保存的文件名称 * @param file 文件流类 * @param request 请求 * @throws IOException IO异常 */ public static void updoadFile(String filePath,String fileName, MultipartFile file, HttpServletRequest request) throws IOException{ //如果文件夹不存在，则创建文件夹 File dirPath = new File(filePath); if(!dirPath.exists()){ dirPath.mkdir(); } File uploadFile = new File(dirPath +"/"+ fileName); FileCopyUtils.copy(file.getBytes(), uploadFile); } /** * 复制文件 * @param localFileName 原文件地址和文件名 * @param tmpFileName 目标文件地址和文件名 * @throws IOException */ public static void copyFile(String localFileName,String tmpFilePath,String tmpFileName) throws IOException{ File localFile = new File(localFileName); File tmpFile = new File(tmpFilePath,tmpFileName); FileCopyUtils.copy(localFile, tmpFile); } /** * 删除文件 * @param fileName 文件地址和文件名 * @throws IOException */ public static void deleteFile(String fileName) throws IOException{ File localFile = new File(fileName); localFile.delete(); } /** * 下载文件，是向页面输出流，不返回流 * @param filePath 文件服务器存储目录 * @param downloadName 下载文件保存的文件名 * @param fileName 服务器存储文件名 * @param request * @param response * @throws UnsupportedEncodingException */ @SuppressWarnings("static-access") public static void downloadFile(String filePath,String downloadName,String fileName,HttpServletRequest request,HttpServletResponse response) throws UnsupportedEncodingException{ fileName = new java.net.URLDecoder().decode(fileName, "utf-8"); downloadName = new java.net.URLDecoder().decode(downloadName, "utf-8"); String path = filePath+fileName; response.setContentType("application/octet-stream;charset=UTF-8"); response.setHeader("Content-Disposition", "attachment;filename=" + new String((downloadName).getBytes("GBK"), "iso8859-1")); try { //以流的形式下载文件 InputStream fis = new BufferedInputStream(new FileInputStream(path)); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); toClient.write(buffer); toClient.flush(); toClient.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 获取文件的is * @param filePath 文件服务器存储目录 * @param fileName 服务器存储文件名 * @param request * @param response * @throws UnsupportedEncodingException */ @SuppressWarnings("static-access") public static InputStream getFileIS(String filePath,String fileName,HttpServletRequest request,HttpServletResponse response) throws UnsupportedEncodingException{ fileName = new java.net.URLDecoder().decode(fileName, "utf-8"); String path = filePath+fileName; InputStream fis = null; try { //以流的形式下载文件 fis = new BufferedInputStream(new FileInputStream(path)); } catch (FileNotFoundException e) { e.printStackTrace(); } return fis; } /** * 保存文件 * @param datas 文件数据 * @param pathName 文件路径 */ public static void saveFile(byte[] datas,String pathName){ File file = new File(pathName); //寤虹珛杈撳嚭瀛楄妭娴� FileOutputStream fos; try { fos = new FileOutputStream(file); //鐢‵ileOutputStream 鐨剋rite鏂规硶鍐欏叆瀛楄妭鏁扮粍 fos.write(datas); //涓轰簡鑺傜渷IO娴佺殑寮�攢锛岄渶瑕佸叧闂� fos.close(); } catch (Exception e) { e.printStackTrace(); } } /** * 获取文件数据 * @param pathName 文件路径 * @return */ public static byte[] getFile(String pathName){ File file = new File(pathName); byte[] buffer = null; try { FileInputStream fis = new FileInputStream(file); ByteArrayOutputStream bos = new ByteArrayOutputStream(1000); byte[] b = new byte[1000]; int n; while ((n = fis.read(b)) != -1) { bos.write(b, 0, n); } fis.close(); bos.close(); buffer = bos.toByteArray(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return buffer; } /** * 计算文件大小文件大小 * @param filePath 文件路径例如：E:\\imgData\\afr\\9211496189393485.jpg * @return 文件大小 Kb */ public static long GetFileSize(String filePath){ long fileSize=0l; FileChannel fc= null; try { File f= new File(filePath); if (f.exists() && f.isFile()){ FileInputStream fis= new FileInputStream(f); fc= fis.getChannel(); fileSize=fc.size()/1024; //logger.info(fileSize); }else{ //logger.info("file doesn't exist or is not a file"); } } catch (FileNotFoundException e) { //logger.error(e); } catch (IOException e) { //logger.error(e); } finally { if (null!=fc){ try{ fc.close(); }catch(IOException e){ //logger.error(e); } } } return fileSize; } /** * getImage 根据图片的路径获取图片给前台 * @author sunjianbo * @time 2016年8月25日上午10:41:37 * @param response * @param request * @param filePath * @throws Exception */ //@RequestMapping(value = "/getImage.do", method = RequestMethod.GET) public void getImage(HttpServletResponse response, HttpServletRequest request,String filePath) throws Exception { BufferedOutputStream bos = null; try { bos = new BufferedOutputStream(response.getOutputStream()); byte[] data = getFile(filePath); bos.write(data); bos.flush(); } catch (Exception e) { e.printStackTrace(); } finally { if (bos != null) bos.close(); } } }
