pull/371/head
wuyibo
parent
1be789faab
commit
1556fc1c2d
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package com.ruoyi.system.utils;
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import com.sun.image.codec.jpeg.JPEGCodec;
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import com.sun.image.codec.jpeg.JPEGEncodeParam;
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import com.sun.image.codec.jpeg.JPEGImageEncoder;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.*;
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/**
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* @author 吴一博
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* @date 2023年08月11日 16:52
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* @Description Java压缩图片util,可等比例宽高不失真压缩，也可直接指定压缩后的宽高
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*/
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public class ImageCompressUtil {
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/**
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* 直接指定压缩后的宽高：
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* (先保存原文件，再压缩、上传)
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* 壹拍项目中用于二维码压缩
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* @param oldFile 要进行压缩的文件全路径
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* @param width 压缩后的宽度
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* @param height 压缩后的高度
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* @param quality 压缩质量
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* @param smallIcon 文件名的小小后缀(注意，非文件后缀名称),入压缩文件名是yasuo.jpg,则压缩后文件名是yasuo(+smallIcon).jpg
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* @return 返回压缩后的文件的全路径
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*/
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public static String zipImageFile(String oldFile, int width, int height,
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float quality, String smallIcon) {
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if (oldFile == null) {
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return null;
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}
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String newImage = null;
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try {
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/**对服务器上的临时文件进行处理 */
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Image srcFile = ImageIO.read(new File(oldFile));
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/** 宽,高设定 */
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BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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tag.getGraphics().drawImage(srcFile, 0, 0, width, height, null);
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String filePrex = oldFile.substring(0, oldFile.indexOf('.'));
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/** 压缩后的文件名 */
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newImage = filePrex + smallIcon + oldFile.substring(filePrex.length());
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/** 压缩之后临时存放位置 */
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FileOutputStream out = new FileOutputStream(newImage);
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JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
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JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);
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/** 压缩质量 */
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jep.setQuality(quality, true);
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encoder.encode(tag, jep);
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out.close();
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return newImage;
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}
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/**
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* 保存文件到服务器临时路径(用于文件上传)
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* @param fileName
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* @param is
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* @return 文件全路径
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*/
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public static String writeFile(String fileName, InputStream is) {
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if (fileName == null || fileName.trim().length() == 0) {
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return null;
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}
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try {
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/** 首先保存到临时文件 */
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FileOutputStream fos = new FileOutputStream(fileName);
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byte[] readBytes = new byte[512];// 缓冲大小
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int readed = 0;
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while ((readed = is.read(readBytes)) > 0) {
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fos.write(readBytes, 0, readed);
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}
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fos.close();
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is.close();
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return fileName;
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}
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/**
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* 等比例压缩算法：
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* 算法思想：根据压缩基数和压缩比来压缩原图，生产一张图片效果最接近原图的缩略图
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* @param srcURL 原图地址
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* @param deskURL 缩略图地址
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* @param comBase 压缩基数
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* @param scale 压缩限制(宽/高)比例 一般用1：
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* 当scale>=1,缩略图height=comBase,width按原图宽高比例;若scale<1,缩略图width=comBase,height按原图宽高比例
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* @throws Exception
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* @author shenbin
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* @createTime 2014-12-16
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* @lastModifyTime 2014-12-16
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*/
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public static void saveMinPhoto(String srcURL, String deskURL, double comBase,
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double scale) throws Exception {
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File srcFile = new java.io.File(srcURL);
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Image src = ImageIO.read(srcFile);
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int srcHeight = src.getHeight(null);
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int srcWidth = src.getWidth(null);
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int deskHeight = 0;// 缩略图高
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int deskWidth = 0;// 缩略图宽
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double srcScale = (double) srcHeight / srcWidth;
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/**缩略图宽高算法*/
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if ((double) srcHeight > comBase || (double) srcWidth > comBase) {
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if (srcScale >= scale || 1 / srcScale > scale) {
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if (srcScale >= scale) {
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deskHeight = (int) comBase;
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deskWidth = srcWidth * deskHeight / srcHeight;
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} else {
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deskWidth = (int) comBase;
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deskHeight = srcHeight * deskWidth / srcWidth;
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}
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} else {
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if ((double) srcHeight > comBase) {
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deskHeight = (int) comBase;
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deskWidth = srcWidth * deskHeight / srcHeight;
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} else {
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deskWidth = (int) comBase;
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deskHeight = srcHeight * deskWidth / srcWidth;
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}
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}
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} else {
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deskHeight = srcHeight;
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deskWidth = srcWidth;
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}
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BufferedImage tag = new BufferedImage(deskWidth, deskHeight, BufferedImage.TYPE_3BYTE_BGR);
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tag.getGraphics().drawImage(src, 0, 0, deskWidth, deskHeight, null); //绘制缩小后的图
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FileOutputStream deskImage = new FileOutputStream(deskURL); //输出到文件流
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JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(deskImage);
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encoder.encode(tag); //近JPEG编码
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deskImage.close();
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}
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}
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