ImgUtil.java根据长宽压缩图片 根据坐标长宽切图 生成缩率图
package com.beisun.mbp.util; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Rectangle; import java.awt.image.BufferedImage; import java.awt.image.ColorModel; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.Arrays; import java.util.Iterator; import javax.imageio.IIOImage; import javax.imageio.ImageIO; import javax.imageio.ImageReadParam; import javax.imageio.ImageReader; import javax.imageio.ImageTypeSpecifier; import javax.imageio.ImageWriteParam; import javax.imageio.ImageWriter; import javax.imageio.metadata.IIOMetadata; import javax.imageio.plugins.jpeg.JPEGImageWriteParam; import javax.imageio.stream.ImageInputStream; import javax.imageio.stream.ImageOutputStream; import org.w3c.dom.Element; import com.sun.imageio.plugins.jpeg.JPEGImageWriter; /** 此方法压缩不失真很好用 * @author zhouqz */ public class ImgUtil { /** * 图片压缩测试 * @param args */ public static void main(String args[]){ //读文件夹所有文件进行压缩处理 // String f = "/var/upload_bak/"; // File file = new File(f); // // if(file.exists()) // { // File[] filelist = file.listFiles(); // for(int i = 0;i<filelist.length;i++) // { // String n = filelist[i].getName(); // Tosmallerpic(f,filelist[i],"_middle",n,185,160,(float)0.7); // Tosmallerpic(f,filelist[i],"_small",n,45,45,(float)0.7); // Tosmallerpic(f,filelist[i],"_smaller",n,116,100,(float)0.7); // } // } //对一个文件进行压缩处理 /* String url = "E:/cims/cimsdata/afr/20160922/"; String name = "query_image.jpg"; img_change(url,name); */ ImgCompress("E:/cims/cimsdata/afr/20160922/1111111111.jpg"); } /**********************************好用的压缩方法开始*******************************************/ /** * 图片压缩 * @param pathName 图片的路径 压缩图片直接替换当前图片 */ public static void ImgCompress(String pathName){ int n=pathName.lastIndexOf("/"); String url=pathName.substring(0,n+1); String name=pathName.substring(n+1); Tosmallerpic(url,new File(url+name),"",name,188,165,(float)0.7); } /** * 此方法压缩不失真很好用 举例用法 * @param url E:/cims/cimsdata/afr/20160922/ * @param name 1111111.jpg */ public static void img_change(String url,String name) { Tosmallerpic(url,new File(url+name),"_middle",name,188,165,(float)0.7); Tosmallerpic(url,new File(url+name),"_small",name,45,45,(float)0.7); Tosmallerpic(url,new File(url+name),"_smaller",name,116,100,(float)0.7); } /** * * @param f 图片所在的文件夹路径 * @param file 图片路径 * @param ext 扩展名 * @param n 图片名 * @param w 目标宽 * @param h 目标高 * @param per 百分比 */ private static void Tosmallerpic(String f,File file,String ext,String n,int w,int h,float per){ Image src; try { src = javax.imageio.ImageIO.read(file); //构造Image对象 String img_midname = f+n.substring(0,n.indexOf("."))+ext+n.substring(n.indexOf(".")); int old_w = src.getWidth(null); //得到源图宽 int old_h = src.getHeight(null); int new_w = 0; int new_h = 0; //得到源图长 double w2 = (old_w*1.00)/(w*1.00); double h2 = (old_h*1.00)/(h*1.00); //图片跟据长宽留白，成一个正方形图。 BufferedImage oldpic; if(old_w>old_h) { oldpic = new BufferedImage(old_w,old_w,BufferedImage.TYPE_INT_RGB); }else{if(old_w<old_h){ oldpic = new BufferedImage(old_h,old_h,BufferedImage.TYPE_INT_RGB); }else{ oldpic = new BufferedImage(old_w,old_h,BufferedImage.TYPE_INT_RGB); } } Graphics2D g = oldpic.createGraphics(); g.setColor(Color.white); if(old_w>old_h) { g.fillRect(0, 0, old_w, old_w); g.drawImage(src, 0, (old_w - old_h) / 2, old_w, old_h, Color.white, null); }else{ if(old_w<old_h){ g.fillRect(0,0,old_h,old_h); g.drawImage(src, (old_h - old_w) / 2, 0, old_w, old_h, Color.white, null); }else{ //g.fillRect(0,0,old_h,old_h); g.drawImage(src.getScaledInstance(old_w, old_h, Image.SCALE_SMOOTH), 0,0,null); } } g.dispose(); src = oldpic; //图片调整为方形结束 if(old_w>w) new_w = (int)Math.round(old_w/w2); else new_w = old_w; if(old_h>h) new_h = (int)Math.round(old_h/h2);//计算新图长宽 else new_h = old_h; BufferedImage image_to_save = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB); image_to_save.getGraphics().drawImage(src.getScaledInstance(new_w, new_h, Image.SCALE_SMOOTH), 0,0,null); FileOutputStream fos = new FileOutputStream(img_midname); //输出到文件流 //旧的使用 jpeg classes进行处理的方法 // JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos); // JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(image_to_save); /* 压缩质量 */ // jep.setQuality(per, true); // encoder.encode(image_to_save, jep); //新的方法 saveAsJPEG(100, image_to_save, per, fos); fos.close(); } catch (IOException ex) { //Logger.getLogger(Img_Middle.class.getName()).log(Level.SEVERE, null, ex); } } /** * 以JPEG编码保存图片 * @param dpi 分辨率 * @param image_to_save 要处理的图像图片 * @param JPEGcompression 压缩比 * @param fos 文件输出流 * @throws IOException */ public static void saveAsJPEG(Integer dpi ,BufferedImage image_to_save, float JPEGcompression, FileOutputStream fos) throws IOException { //useful documentation at http://docs.oracle.com/javase/7/docs/api/javax/imageio/metadata/doc-files/jpeg_metadata.html //useful example program at http://johnbokma.com/java/obtaining-image-metadata.html to output JPEG data //old jpeg class //com.sun.image.codec.jpeg.JPEGImageEncoder jpegEncoder = com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder(fos); //com.sun.image.codec.jpeg.JPEGEncodeParam jpegEncodeParam = jpegEncoder.getDefaultJPEGEncodeParam(image_to_save); // Image writer JPEGImageWriter imageWriter = (JPEGImageWriter) ImageIO.getImageWritersBySuffix("jpg").next(); ImageOutputStream ios = ImageIO.createImageOutputStream(fos); imageWriter.setOutput(ios); //and metadata IIOMetadata imageMetaData = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(image_to_save), null); if(dpi != null && !dpi.equals("")){ //old metadata //jpegEncodeParam.setDensityUnit(com.sun.image.codec.jpeg.JPEGEncodeParam.DENSITY_UNIT_DOTS_INCH); //jpegEncodeParam.setXDensity(dpi); //jpegEncodeParam.setYDensity(dpi); //new metadata Element tree = (Element) imageMetaData.getAsTree("javax_imageio_jpeg_image_1.0"); Element jfif = (Element)tree.getElementsByTagName("app0JFIF").item(0); jfif.setAttribute("Xdensity", Integer.toString(dpi) ); jfif.setAttribute("Ydensity", Integer.toString(dpi)); } if(JPEGcompression >= 0 && JPEGcompression <= 1f){ //old compression //jpegEncodeParam.setQuality(JPEGcompression,false); // new Compression JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) imageWriter.getDefaultWriteParam(); jpegParams.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT); jpegParams.setCompressionQuality(JPEGcompression); } //old write and clean //jpegEncoder.encode(image_to_save, jpegEncodeParam); //new Write and clean up imageWriter.write(imageMetaData, new IIOImage(image_to_save, null, null), null); ios.close(); imageWriter.dispose(); } /**********************************好用的压缩方法结束*******************************************/ /** * 压缩图片文件 测试发现图片压缩小了会失真 不如上面的方法好用 * @param srcFilePath 当前图片地址 * @param descFilePath 压缩后的地址 * @return */ public static boolean compressPic(String srcFilePath, String descFilePath) { File file = null; BufferedImage src = null; FileOutputStream out = null; ImageWriter imgWrier; ImageWriteParam imgWriteParams; // 指定写图片的方式为 jpg imgWrier = ImageIO.getImageWritersByFormatName("jpg").next(); imgWriteParams = new javax.imageio.plugins.jpeg.JPEGImageWriteParam(null); // 要使用压缩，必须指定压缩方式为MODE_EXPLICIT imgWriteParams.setCompressionMode(imgWriteParams.MODE_EXPLICIT); // 这里指定压缩的程度，参数qality是取值0~1范围内， imgWriteParams.setCompressionQuality((float)0.1); imgWriteParams.setProgressiveMode(imgWriteParams.MODE_DISABLED); ColorModel colorModel = ColorModel.getRGBdefault(); // 指定压缩时使用的色彩模式 imgWriteParams.setDestinationType(new javax.imageio.ImageTypeSpecifier(colorModel, colorModel .createCompatibleSampleModel(16, 16))); try { if(null==srcFilePath||"".equals(srcFilePath)) { return false; } else { file = new File(srcFilePath); src = ImageIO.read(file); out = new FileOutputStream(descFilePath); imgWrier.reset(); // 必须先指定 out值，才能调用write方法, ImageOutputStream可以通过任何 OutputStream构造 imgWrier.setOutput(ImageIO.createImageOutputStream(out)); // 调用write方法，就可以向输入流写图片 imgWrier.write(null, new IIOImage(src, null, null), imgWriteParams); out.flush(); out.close(); } } catch(Exception e) { e.printStackTrace(); return false; } return true; } /** * 切图 * @param fileName * @param x * @param y * @param width * @param height * @throws IOException */ public static void cutHead(String fileName,int x,int y,int width,int height) throws IOException { FileInputStream is = null; ImageInputStream iis = null; try { is = new FileInputStream(fileName+".jpg"); Iterator<ImageReader> it = ImageIO .getImageReadersByFormatName("jpg"); ImageReader reader = it.next(); iis = ImageIO.createImageInputStream(is); reader.setInput(iis, true); ImageReadParam param = reader.getDefaultReadParam(); Rectangle rect = new Rectangle(x, y, width, height); param.setSourceRegion(rect); BufferedImage bi = reader.read(0, param); ImageIO.write(bi, "jpg", new File(fileName+"-1"+".jpg")); } finally { if (is != null) is.close(); if (iis != null) iis.close(); } } /**缩率图 * Title: thumbnailImage 测试发现压缩到了大部分图片2K * Description: 根据图片路径生成缩略图 * @param imagePath 原图片路径 * @param w 缩略图宽 * @param h 缩略图高 * @param prevfix 生成缩略图的前缀 * @param force 是否强制按照宽高生成缩略图(如果为false，则生成最佳比例缩略图) */ public static void thumbnailImage(File imgFile, int w, int h, String prevfix, boolean force){ byte[] data=null; if(imgFile.exists()){ try { // ImageIO 支持的图片类型 : [BMP, bmp, jpg, JPG, wbmp, jpeg, png, PNG, JPEG, WBMP, GIF, gif] String types = Arrays.toString(ImageIO.getReaderFormatNames()); String suffix = null; // 获取图片后缀 if(imgFile.getName().indexOf(".") > -1) { suffix = imgFile.getName().substring(imgFile.getName().lastIndexOf(".") + 1); }// 类型和图片后缀全部小写，然后判断后缀是否合法 if(suffix == null || types.toLowerCase().indexOf(suffix.toLowerCase()) < 0){ //logger.error("Sorry, the image suffix is illegal. the standard image suffix is {}." + types); //return null; } //logger.debug("target image's size, {}, height:{}."); Image img = ImageIO.read(imgFile); if(!force){ // 根据原图与要求的缩略图比例，找到最合适的缩略图比例 int width = img.getWidth(null); int height = img.getHeight(null); if((width*1.0)/w < (height*1.0)/h){ if(width > w){ h = Integer.parseInt(new java.text.DecimalFormat("0").format(height * w/(width*1.0))); //logger.debug("change image's height, {}, height:{}."); } } else { if(height > h){ w = Integer.parseInt(new java.text.DecimalFormat("0").format(width * h/(height*1.0))); //logger.debug("change image's width, {}, height:{}."); } } } BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Graphics g = bi.getGraphics(); g.drawImage(img, 0, 0, w, h, Color.LIGHT_GRAY, null); g.dispose(); String p = imgFile.getPath(); // 将图片保存在原目录并加上前缀 String str=p.substring(0,p.lastIndexOf(File.separator)) + File.separator + prevfix +imgFile.getName(); ByteArrayOutputStream out = new ByteArrayOutputStream(); //boolean flag = ImageIO.write(bi, "gif", out); boolean flag = ImageIO.write(bi, suffix, out); //如果返回数据的话就把下面的注释打开 // data = out.toByteArray(); //return data; //些图片到某个路径 ImageIO.write(bi, suffix, new File(p.substring(0,p.lastIndexOf(File.separator)) + File.separator + prevfix +imgFile.getName())); } catch (IOException e) { //logger.error("generate thumbnail image failed.",e); } }else{ //logger.warn("the image is not exist."); } //return data; } }