java上传图片并压缩图片大小
Thumbnailator 是一个优秀的图片处理的Google开源Java类库。处理效果远比Java API的好。从API提供现有的图像文件和图像对象的类中简化了处理过程,两三行代码就能够从现有图片生成处理后的图片,且允许微调图片的生成方式,同时保持了需要写入的最低限度的代码量。还支持对一个目录的所有图片进行批量处理操作。
支持的处理操作:图片缩放,区域裁剪,水印,旋转,保持比例。
另外值得一提的是,Thumbnailator至今仍不断更新,怎么样,感觉很有保障吧!
Thumbnailator官网:http://code.google.com/p/thumbnailator/
下面我们介绍下如何使用Thumbnailator
使用介绍地址:
http://blog.csdn.net/chenleixing/article/details/44685817
http://www.qzblog.net/blog/220
http://blog.csdn.net/wangpeng047/article/details/17610451
缩略图压缩文件jar包
<!-- 图片缩略图 --> <dependency> <groupId>net.coobird</groupId> <artifactId>thumbnailator</artifactId> <version>0.4.8</version> </dependency>
按指定大小把图片进行缩放(会遵循原图高宽比例)
//按指定大小把图片进行缩和放(会遵循原图高宽比例) //此处把图片压成400×500的缩略图 Thumbnails.of(fromPic).size(400,500).toFile(toPic);//变为400*300,遵循原图比例缩或放到400*某个高度
按照指定比例进行缩小和放大
//按照比例进行缩小和放大 Thumbnails.of(fromPic).scale(0.2f).toFile(toPic);//按比例缩小 Thumbnails.of(fromPic).scale(2f);//按比例放大
图片尺寸不变,压缩图片文件大小
//图片尺寸不变,压缩图片文件大小outputQuality实现,参数1为最高质量 Thumbnails.of(fromPic).scale(1f).outputQuality(0.25f).toFile(toPic);
我这里只使用了 图片尺寸不变,压缩文件大小 源码
/** * * @Description:保存图片并且生成缩略图 * @param imageFile 图片文件 * @param request 请求对象 * @param uploadPath 上传目录 * @return */ public static BaseResult uploadFileAndCreateThumbnail(MultipartFile imageFile,HttpServletRequest request,String uploadPath) { if(imageFile == null ){ return new BaseResult(false, "imageFile不能为空"); } if (imageFile.getSize() >= 10*1024*1024) { return new BaseResult(false, "文件不能大于10M"); } String uuid = UUID.randomUUID().toString(); String fileDirectory = CommonDateUtils.date2string(new Date(), CommonDateUtils.YYYY_MM_DD); //拼接后台文件名称 String pathName = fileDirectory + File.separator + uuid + "." + FilenameUtils.getExtension(imageFile.getOriginalFilename()); //构建保存文件路劲 //2016-5-6 yangkang 修改上传路径为服务器上 String realPath = request.getServletContext().getRealPath("uploadPath"); //获取服务器绝对路径 linux 服务器地址 获取当前使用的配置文件配置 //String urlString=PropertiesUtil.getInstance().getSysPro("uploadPath"); //拼接文件路劲 String filePathName = realPath + File.separator + pathName; log.info("图片上传路径:"+filePathName); //判断文件保存是否存在 File file = new File(filePathName); if (file.getParentFile() != null || !file.getParentFile().isDirectory()) { //创建文件 file.getParentFile().mkdirs(); } InputStream inputStream = null; FileOutputStream fileOutputStream = null; try { inputStream = imageFile.getInputStream(); fileOutputStream = new FileOutputStream(file); //写出文件 //2016-05-12 yangkang 改为增加缓存 //IOUtils.copy(inputStream, fileOutputStream); byte[] buffer = new byte[2048]; IOUtils.copyLarge(inputStream, fileOutputStream, buffer); buffer = null; } catch (IOException e) { filePathName = null; return new BaseResult(false, "操作失败", e.getMessage()); } finally { try { if (inputStream != null) { inputStream.close(); } if (fileOutputStream != null) { fileOutputStream.flush(); fileOutputStream.close(); } } catch (IOException e) { filePathName = null; return new BaseResult(false, "操作失败", e.getMessage()); } } //String fileId = FastDFSClient.uploadFile(file, filePathName); /** * 缩略图begin */ //拼接后台文件名称 String thumbnailPathName = fileDirectory + File.separator + uuid + "small." + FilenameUtils.getExtension(imageFile.getOriginalFilename()); //added by yangkang 2016-3-30 去掉后缀中包含的.png字符串 if(thumbnailPathName.contains(".png")){ thumbnailPathName = thumbnailPathName.replace(".png", ".jpg"); } long size = imageFile.getSize(); double scale = 1.0d ; if(size >= 200*1024){ if(size > 0){ scale = (200*1024f) / size ; } } //拼接文件路劲 String thumbnailFilePathName = realPath + File.separator + thumbnailPathName; try { //added by chenshun 2016-3-22 注释掉之前长宽的方式,改用大小 //Thumbnails.of(filePathName).size(width, height).toFile(thumbnailFilePathName); if(size < 200*1024){ Thumbnails.of(filePathName).scale(1f).outputFormat("jpg").toFile(thumbnailFilePathName); }else{ Thumbnails.of(filePathName).scale(1f).outputQuality(scale).outputFormat("jpg").toFile(thumbnailFilePathName); } } catch (Exception e1) { return new BaseResult(false, "操作失败", e1.getMessage()); } /** * 缩略图end */ Map<String, Object> map = new HashMap<String, Object>(); //原图地址 map.put("originalUrl", pathName); //缩略图地址 map.put("thumbnailUrl", thumbnailPathName); return new BaseResult(true, "操作成功", map); }
获取当前使用的配置文件信息
/** * 根据key从gzt.properties配置文件获取配置信息 * @param key 键值 * @return */ public String getSysPro(String key){ return getSysPro(key, null); } /** * 根据key从gzt.properties配置文件获取配置信息 * @param key 键值 * @param defaultValue 默认值 * @return */ public String getSysPro(String key,String defaultValue){ return getValue("spring/imageserver-"+System.getProperty("spring.profiles.active")+".properties", key, defaultValue); }
例:
//获取服务器绝对路径 linux 服务器地址 String urlString=PropertiesUtil.getInstance().getSysPro("uploadPath");
PropertiesUtil 类
package com.xyz.imageserver.common.properties; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.Properties; import java.util.concurrent.ConcurrentHashMap; /** * * @ClassName PropertiesUtil.java * @Description 系统配置工具类 * @author caijy * @date 2015年6月9日 上午10:50:38 * @version 1.0.0 */ public class PropertiesUtil { private Logger logger = LoggerFactory.getLogger(PropertiesUtil.class); private ConcurrentHashMap<String, Properties> proMap; private PropertiesUtil() { proMap = new ConcurrentHashMap<String, Properties>(); } private static PropertiesUtil instance = new PropertiesUtil(); /** * 获取单例对象 * @return */ public static PropertiesUtil getInstance() { return instance; } /** * 根据key从gzt.properties配置文件获取配置信息 * @param key 键值 * @return */ public String getSysPro(String key){ return getSysPro(key, null); } /** * 根据key从gzt.properties配置文件获取配置信息 * @param key 键值 * @param defaultValue 默认值 * @return */ public String getSysPro(String key,String defaultValue){ return getValue("spring/imageserver-"+System.getProperty("spring.profiles.active")+".properties", key, defaultValue); } /** * 从配置文件中获取对应key值 * @param fileName 配置文件名 * @param key key值 * @param defaultValue 默认值 * @return */ public String getValue(String fileName,String key,String defaultValue){ String val = null; Properties properties = proMap.get(fileName); if(properties == null){ InputStream inputStream = PropertiesUtil.class.getClassLoader().getResourceAsStream(fileName); try { properties = new Properties(); properties.load(new InputStreamReader(inputStream,"UTF-8")); proMap.put(fileName, properties); val = properties.getProperty(key,defaultValue); } catch (IOException e) { logger.error("getValue",e); }finally{ try { if (inputStream != null) { inputStream.close(); } } catch (IOException e1) { logger.error(e1.toString()); } } }else{ val = properties.getProperty(key,defaultValue); } return val; } }
批量压缩图片:
package com.xhj.util; import java.io.File; import java.text.SimpleDateFormat; import java.util.Date; import java.util.LinkedHashMap; import net.coobird.thumbnailator.Thumbnails; public class ImgChange { /** * 读取某个目录下所有文件、文件夹 * @param path * @return LinkedHashMap<String,String> */ public static LinkedHashMap<String,String> getFiles(String path) { LinkedHashMap<String,String> files = new LinkedHashMap<String,String>(); File file = new File(path); File[] tempList = file.listFiles(); for (int i = 0; i < tempList.length; i++) { if (!tempList[i].isDirectory()) { files.put(tempList[i].getName(),tempList[i].getPath()); } } return files; } public static void main(String[] args) { try { LinkedHashMap<String,String> files = getFiles("D:/img"); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS"); Date beginDate = new Date(); System.out.println("开始:"+sdf.format(beginDate)); int i = 0; for (String fileName : files.keySet()) { i = i+1; System.out.println("第"+i+"张:"+sdf.format(new Date())); //图片尺寸不变,压缩图片文件大小outputQuality实现,参数1为最高质量 double scale = 1.0; Thumbnails.of("D:/img/"+fileName).scale(scale).toFile("D:/imgCopy/"+fileName); File file = new File("D:/imgCopy/"+fileName); if (file.exists()) { while (file.length()>=500000) { scale = scale*0.9; file.delete(); Thumbnails.of("D:/img/"+fileName).scale(scale).toFile("D:/imgCopy/"+fileName); } } } Date endDate = new Date(); System.out.println("结束:"+sdf.format(endDate)); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }