Java tutorial
/** * Project: goldroom-biz File Created at 2010-1-4 $Id$ Copyright 2008 Alibaba.com Croporation Limited. All rights * reserved. This software is the confidential and proprietary information of Alibaba Company. * ("Confidential Information"). You shall not disclose such Confidential Information and shall use it only in * accordance with the terms of the license agreement you entered into with Alibaba.com. */ package com.alibaba.intl.bcds.goldroom.util; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import org.apache.commons.lang.StringUtils; import org.apache.log4j.Logger; import org.springframework.beans.factory.InitializingBean; import com.alibaba.intl.bcds.goldroom.mail.service.impl.SendMailServiceImpl; /** * TODO Comment of ImageUtilImpl * * @author Zimmem */ public class ImageUtilImpl implements ImageUtil, InitializingBean { private static Logger logger = Logger.getLogger(ImageUtilImpl.class); public static final String HTTP_SEPARATOR = "/"; private String uploadPath; public String save(String isbn, String suffix, byte[] body) { String dirPath = uploadPath + isbnTopath(isbn); File dir = new File(dirPath); if (!dir.exists()) { if (!dir.mkdirs()) { logger.error("mkdirs failed: " + dirPath); } } StringBuilder imgPath = new StringBuilder(dirPath); imgPath.append(isbn).append(suffix); File imageFile = new File(imgPath.toString()); FileOutputStream fos = null; try { fos = new FileOutputStream(imageFile); fos.write(body); fos.flush(); } catch (IOException e) { logger.error(e); return null; } finally { try { if (fos != null) fos.close(); } catch (IOException e) { logger.error(e); } } return isbnToHttpPath(isbn, suffix); } /** * @param isbn * @param suffix * @return */ private String isbnToHttpPath(String isbn, String suffix) { StringBuilder path = new StringBuilder(isbnTopath(isbn, HTTP_SEPARATOR)); return path.append(isbn).append(suffix).toString(); } private String isbnTopath(String isbn) { return isbnTopath(isbn, File.separator); } private String isbnTopath(String isbn, String separator) { StringBuilder sb = new StringBuilder(); sb.append(separator).append(StringUtils.left(isbn, 2)); sb.append(separator).append(StringUtils.mid(isbn, 2, 2)); sb.append(separator).append(StringUtils.mid(isbn, 4, 2)); sb.append(separator); return sb.toString(); } public void setUploadPath(String uploadPath) { this.uploadPath = uploadPath; } public String getUploadPath() { return uploadPath; } public void afterPropertiesSet() throws Exception { if (StringUtils.isEmpty(uploadPath)) { throw new Exception("upload path can not be null or empty"); } } }