java上传图片尺寸修改和质量压缩
马朝旭 人气:0package com.zity.frame.util; /** * 缩略图实现,将图片(jpg、bmp、png、gif等等)真实的变成想要的大小 */ import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; import net.sourceforge.pinyin4j.PinyinHelper; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.*; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.util.Random; /******************************************************************************* * 缩略图类(通用) 本java类能将jpg、bmp、png、gif图片文件,进行等比或非等比的大小转换。 具体使用方法 * compressPic(大图片路径,生成小图片路径,大图片文件名,生成小图片文名,生成小图片宽度,生成小图片高度,是否等比缩放(默认为true)) */ public class CompressPic { private File file = null; // 文件对象 private String inputDir; // 输入图路径 private String outputDir; // 输出图路径 private String inputFileName; // 输入图文件名 private String outputFileName; // 输出图文件名 private int outputWidth = 300; // 默认输出图片宽 private int outputHeight = 150; // 默认输出图片高 private boolean proportion = true; // 是否等比缩放标记(默认为等比缩放) public CompressPic() { // 初始化变量 inputDir = ""; outputDir = ""; inputFileName = ""; outputFileName = ""; outputWidth = 300; outputHeight = 150; } public void setInputDir(String inputDir) { this.inputDir = inputDir; } public void setOutputDir(String outputDir) { this.outputDir = outputDir; } public void setInputFileName(String inputFileName) { this.inputFileName = inputFileName; } public void setOutputFileName(String outputFileName) { this.outputFileName = outputFileName; } public void setOutputWidth(int outputWidth) { this.outputWidth = outputWidth; } public void setOutputHeight(int outputHeight) { this.outputHeight = outputHeight; } public void setWidthAndHeight(int width, int height) { this.outputWidth = width; this.outputHeight = height; } /* * 获得图片大小 * 传入参数 String path :图片路径 */ public long getPicSize(String path) { file = new File(path); return file.length(); } /** * 图片处理 * @return */ public String compressPic() { try { //获得源文件 file = new File(inputDir + inputFileName); if (!file.exists()) { return ""; } // 生成存储路径 File outDir = new File(outputDir); if(!outDir.exists()){ outDir.mkdirs(); } Image img = ImageIO.read(file); // 判断图片格式是否正确 if(img==null){ return ""; } if (img.getWidth(null) == -1) { System.out.println(" can't read,retry!" + "<BR>"); return "no"; } else { int newWidth; int newHeight; // 判断是否是等比缩放 if (this.proportion == true) { // 为等比缩放计算输出的图片宽度及高度 int w =img.getWidth(null); int h = img.getHeight(null); //如果图片的宽度小于等于250,并且高度小于等于183,图片原样输出 if(w<=300){ outputWidth=w; } if(h<=150){ outputHeight=h; } double rate1 = ((double) img.getWidth(null)) / (double) outputWidth; double rate2 = ((double) img.getHeight(null)) / (double) outputHeight; // 根据缩放比率大的进行缩放控制 // double rate = rate1 > rate2 ? rate1 : rate2; // 保证宽度为250px double rate = rate1; newWidth = (int) (((double) img.getWidth(null)) / rate); newHeight = (int) (((double) img.getHeight(null)) / rate2); } else { newWidth = outputWidth; // 输出的图片宽度 newHeight = outputHeight; // 输出的图片高度 } //重新设置高宽为图片真实高宽,上面的高宽是其他项目需要300*150的,我没得空删掉 newWidth = getImgWidth(file); newHeight = getImgHeight(file); BufferedImage tag = new BufferedImage((int) newWidth, (int) newHeight, BufferedImage.TYPE_INT_RGB); /* * Image.SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 * 优先级比速度高 生成的图片质量比较好 但速度慢 */ tag.getGraphics().drawImage(img.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH), 0, 0, null); FileOutputStream out = new FileOutputStream(outputDir + outputFileName); // JPEGImageEncoder可适用于其他图片类型的转换 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(tag); out.close(); } } catch (IOException ex) { ex.printStackTrace(); } return "ok"; } /** * 图片处理入口 * @param inputDir 输入图路径 * @param outputDir 输出图路径 * @param inputFileName 输入图名 * @param outputFileName 输出图名 * @return */ public String compressPic (String inputDir, String outputDir, String inputFileName, String outputFileName) { // 输入图路径 this.inputDir = inputDir; // 输出图路径 this.outputDir = outputDir; // 输入图文件名 this.inputFileName = inputFileName; // 输出图文件名 this.outputFileName = outputFileName; return compressPic(); } /** * 图片处理入口 * @param inputDir 输入图路径 * @param outputDir 输出图路径 * @param inputFileName 输入图名 * @param outputFileName 输出图名 * @param width 输出图宽度 * @param height 输入图宽度 * @param gp 等比缩放 * @return */ public String compressPic(String inputDir, String outputDir, String inputFileName, String outputFileName, int width, int height, boolean gp) { // 输入图路径 this.inputDir = inputDir; // 输出图路径 this.outputDir = outputDir; // 输入图文件名 this.inputFileName = inputFileName; // 输出图文件名 this.outputFileName = outputFileName; // 设置图片长宽 setWidthAndHeight(width, height); // 是否是等比缩放 标记 this.proportion = gp; return compressPic(); } /** * 图片压缩 * @param downloadUrl * @param inputDir * @param outDir * @return */ public String ImageCompression(String downloadUrl,String inputDir,String outDir){ Random rnd = new Random(); String picName = downloadUrl.substring(downloadUrl.lastIndexOf("/")+1); String extendName =""; String beforeName= ""; if(picName.contains(".")){ extendName = picName.substring(picName.indexOf(".")); beforeName= picName.substring(0,picName.indexOf(".")); }else{ extendName = picName; beforeName= picName; } //随机数 Integer r = rnd.nextInt(1000); beforeName = new CompressPic().getPinYinHeadChar(beforeName); long ts = System.currentTimeMillis(); String outpicName=ts+beforeName+r+".jpg"; outpicName = outpicName.replace("%", ""); if(outpicName.contains("张栋杰总经理会见旭阳集团董事长杨雪岗")){ outpicName="zdjzjlhjxyjtdszyxg.jpg"; } if(httpDownload(downloadUrl, inputDir, outpicName)){ // 当前时间 // String curTime = new Long(System.currentTimeMillis()).toString(); this.compressPic(inputDir, outDir, outpicName, outpicName, 300, 150, true); return outpicName; }else { return null; } } /** * http图片下载 * @param httpUrl * @param saveFile * @return */ public static boolean httpDownload(String httpUrl,String saveDir,String saveName){ // 下载网络文件 int bytesum = 0; int byteread = 0; URL url = null; try { url = new URL(httpUrl); } catch (MalformedURLException e1) { e1.printStackTrace(); return false; } // 存储目录 File outDir = new File(saveDir); if(!outDir.exists()){ outDir.mkdirs(); } try { URLConnection conn = url.openConnection(); InputStream inStream = conn.getInputStream(); FileOutputStream fs = new FileOutputStream(saveDir+saveName); byte[] buffer = new byte[1204]; while ((byteread = inStream.read(buffer)) != -1) { bytesum += byteread; fs.write(buffer, 0, byteread); } fs.close(); inStream.close(); } catch (FileNotFoundException e) { e.printStackTrace(); return false; } catch (IOException e) { e.printStackTrace(); return false; } return true; } /** * 提取每个汉字的首字母 * * @param str * @return String */ public String getPinYinHeadChar(String str) { String convert = ""; for (int j = 0; j < str.length(); j++) { char word = str.charAt(j); // 提取汉字的首字母 String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(word); if (pinyinArray != null) { convert += pinyinArray[0].charAt(0); } else { convert += word; } } return convert; } public static void main(String[] arg) { CompressPic mypic = new CompressPic(); mypic.compressPic("C:\\Users\\mazhaoxu\\Desktop\\", "C:\\Users\\mazhaoxu\\Desktop\\", "微信图片_20180712182800.png", "2019061818542824511111111111.png"); // if(httpDownload("http://221.195.72.44:8122/NR/rdonlyres/B5071DE7-9652-44AF-9534-0EE0ED2DCA92/15177/resource_651768621.jpg", "D:\\data\\resource_651768621.jpg")){ // int start = (int) System.currentTimeMillis(); // 开始时间 // mypic.compressPic("D:\\data\\", "D:\\data\\", "resource_651768621.jpg", "r1"+start+".jpg", 250, 250, true); // } // String s= mypic.getPinYinHeadChar("http://114.251.186.42:81/web-s/images/1447069462915xfydh1_fb_fb521.jpg"); // mypic.ImageCompression("http://114.251.186.42:81/web-s/images/mobile/1447069462915xfydh1_fb_fb521.jpg","d:\\images\\", "d:\\images\\mobile\\"); // mypic.compressPic("d:\\", "d:\\image\\mobile", "144921941137520151204fgw1747.jpg", "144921941137520151204fgw1747.jpg"); // String s = "/image/dslfsjss/image/sisis /image"; // System.out.println(s.replace("/image/", "/mobile/image/")); } /** * 获取图片宽度 * @param file 图片文件 * @return 宽度 */ public static int getImgWidth(File file) { InputStream is = null; BufferedImage src = null; int ret = -1; try { is = new FileInputStream(file); src = javax.imageio.ImageIO.read(is); ret = src.getWidth(null); // 得到源图宽 is.close(); } catch (Exception e) { e.printStackTrace(); } return ret; } /** * 获取图片高度 * @param file 图片文件 * @return 高度 */ public static int getImgHeight(File file) { InputStream is = null; BufferedImage src = null; int ret = -1; try { is = new FileInputStream(file); src = javax.imageio.ImageIO.read(is); ret = src.getHeight(null); // 得到源图高 is.close(); } catch (Exception e) { e.printStackTrace(); } return ret; } }
这是我用的工具类,其中里面业务会用到pinyin4j的jar包,和图片压缩关系不大,可以去除,我是因为比较着急改完,就没动,如果不想改,需要引入pinyin4j的jar包。
maven:
<!-- https://mvnrepository.com/artifact/com.belerweb/pinyin4j --> <dependency> <groupId>com.belerweb</groupId> <artifactId>pinyin4j</artifactId> <version>2.5.0</version> </dependency>
可以自行用上面工具类里的main方法进行测试
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