import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.math.MathContext;
import java.util.ArrayList;
import javax.imageio.ImageIO;
public class ImageCompressUtil {
/**
* 直接指定压缩后的宽高：
* (先保存原文件，再压缩、上传)
* 壹拍项目中用于二维码压缩
* @param oldFile 要进行压缩的文件全路径
* @param width 压缩后的宽度
* @param height 压缩后的高度
* @param quality 压缩质量
* @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
* @return 返回压缩后的文件的全路径
*/
public static String zipImageFile(String oldFile, int width, int height,
float quality, String smallIcon) {
if (oldFile == null) {
return null;
}
String newImage = null;
try {
/**对服务器上的临时文件进行处理 */
Image srcFile = ImageIO.read(new File(oldFile));
/** 宽,高设定 */
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(srcFile, 0, 0, width, height, null);
String filePrex = oldFile.substring(0, oldFile.indexOf('.'));
/** 压缩后的文件名 */
newImage = filePrex + smallIcon + oldFile.substring(filePrex.length());
/** 压缩之后临时存放位置 */
FileOutputStream out = new FileOutputStream(newImage);
// JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
// JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);
// /** 压缩质量 */
// jep.setQuality(quality, true);
// encoder.encode(tag, jep);
String formatName = newImage.substring(newImage.lastIndexOf(".") + 1);
//FileOutputStream out = new FileOutputStream(dstName);
//JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
//encoder.encode(dstImage);
ImageIO.write(tag, formatName , new File(newImage) );
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(newImage);
return newImage;
}
private static int parseDoubleToInt(double sourceDouble) {
int result = 0;
result = (int) sourceDouble;
return result;
}
public static double getDot2Decimal(int a, int b) {
BigDecimal bigDecimal_1 = new BigDecimal(a);
BigDecimal bigDecimal_2 = new BigDecimal(b);
BigDecimal bigDecimal_result = bigDecimal_1.divide(bigDecimal_2, new MathContext(4));
Double double1 = new Double(bigDecimal_result.toString());
System.out.println("相除后的double为：" + double1);
return double1;
}
/***
*
* @param bufferedImage 要缩放的图片对象
* @param width_scale 要缩放到的宽度
* @param height_scale 要缩放到的高度
* @return 一个集合，第一个元素为宽度，第二个元素为高度
*/
private static ArrayList<Integer> getAutoWidthAndHeight(BufferedImage bufferedImage, int width_scale,
int height_scale) {
ArrayList<Integer> arrayList = new ArrayList<Integer>();
int width = bufferedImage.getWidth();
int height = bufferedImage.getHeight();
double scale_w = getDot2Decimal(width_scale, width);
System.out.println("getAutoWidthAndHeight width=" + width + "scale_w=" + scale_w);
double scale_h = getDot2Decimal(height_scale, height);
if (scale_w < scale_h) {
arrayList.add(parseDoubleToInt(scale_w * width));
arrayList.add(parseDoubleToInt(scale_w * height));
} else {
arrayList.add(parseDoubleToInt(scale_h * width));
arrayList.add(parseDoubleToInt(scale_h * height));
}
return arrayList;
}
public static void scaleImageWithParams2(String oldFile, int width, int height,
String smallIcon,boolean auto) {
String newImage = null;
try {
File file = new File(oldFile);
BufferedImage bufferedImage = null;
bufferedImage = ImageIO.read(file);
if (auto) {
ArrayList<Integer> paramsArrayList = getAutoWidthAndHeight(bufferedImage, width, height);
width = paramsArrayList.get(0);
height = paramsArrayList.get(1);
System.out.println("自动调整比例，width=" + width + " height=" + height);
}
String filePrex = oldFile.substring(0, oldFile.indexOf('.'));
/** 压缩后的文件名 */
newImage = filePrex + smallIcon + oldFile.substring(filePrex.length());
/** 压缩之后临时存放位置 */
FileOutputStream out = new FileOutputStream(newImage);
Image image = bufferedImage.getScaledInstance(width, height, Image.SCALE_DEFAULT);
BufferedImage outputImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics graphics = outputImage.getGraphics();
graphics.drawImage(image, 0, 0, null);
graphics.dispose();
ImageIO.write(outputImage, filePrex, out);
System.out.println(newImage);
} catch (Exception e) {
System.out.println("scaleImageWithParams方法压缩图片时出错了");
e.printStackTrace();
}
}
public static String zipImageFile(File oldFile, int width, int height,
float quality, String smallIcon) {
if (oldFile == null) {
return null;
}
String newImage = null;
try {
/**对服务器上的临时文件进行处理 */
Image srcFile = ImageIO.read(oldFile);
/** 宽,高设定 */
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(srcFile, 0, 0, width, height, null);
String filePrex = oldFile.getAbsolutePath().substring(0, oldFile.getAbsoluteFile().toString().indexOf('.'));
/** 压缩后的文件名 */
newImage = filePrex + smallIcon + oldFile.getAbsolutePath().substring(filePrex.length());
/** 压缩之后临时存放位置 */
FileOutputStream out = new FileOutputStream(newImage);
// JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
// JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);
// /** 压缩质量 */
// jep.setQuality(quality, true);
// encoder.encode(tag, jep);
String formatName = newImage.substring(newImage.lastIndexOf(".") + 1);
//FileOutputStream out = new FileOutputStream(dstName);
//JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
//encoder.encode(dstImage);
ImageIO.write(tag, formatName , new File(newImage) );
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(newImage);
return newImage;
}
/**
* 保存文件到服务器临时路径(用于文件上传)
* @param fileName
* @param is
* @return 文件全路径
*/
public static String writeFile(String fileName, InputStream is) {
if (fileName == null || fileName.trim().length() == 0) {
return null;
}
try {
/** 首先保存到临时文件 */
FileOutputStream fos = new FileOutputStream(fileName);
byte[] readBytes = new byte[512];// 缓冲大小
int readed = 0;
while ((readed = is.read(readBytes)) > 0) {
fos.write(readBytes, 0, readed);
}
fos.close();
is.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return fileName;
}
/**
* 等比例压缩算法：
* 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
* @param srcURL 原图地址
* @param deskURL 缩略图地址
* @param comBase 压缩基数
* @param scale 压缩限制(宽/高)比例 一般用1：
* 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
* @throws Exception
* @author shenbin
* @createTime 2014-12-16
* @lastModifyTime 2014-12-16
*/
// public static void saveMinPhoto(String srcURL, String deskURL, double comBase,
// double scale) throws Exception {
// File srcFile = new java.io.File(srcURL);
// Image src = ImageIO.read(srcFile);
// int srcHeight = src.getHeight(null);
// int srcWidth = src.getWidth(null);
// int deskHeight = 0;// 缩略图高
// int deskWidth = 0;// 缩略图宽
// double srcScale = (double) srcHeight / srcWidth;
// /**缩略图宽高算法*/
// if ((double) srcHeight > comBase || (double) srcWidth > comBase) {
// if (srcScale >= scale || 1 / srcScale > scale) {
// if (srcScale >= scale) {
// deskHeight = (int) comBase;
// deskWidth = srcWidth * deskHeight / srcHeight;
// } else {
// deskWidth = (int) comBase;
// deskHeight = srcHeight * deskWidth / srcWidth;
// }
// } else {
// if ((double) srcHeight > comBase) {
// deskHeight = (int) comBase;
// deskWidth = srcWidth * deskHeight / srcHeight;
// } else {
// deskWidth = (int) comBase;
// deskHeight = srcHeight * deskWidth / srcWidth;
// }
// }
// } else {
// deskHeight = srcHeight;
// deskWidth = srcWidth;
// }
// BufferedImage tag = new BufferedImage(deskWidth, deskHeight, BufferedImage.TYPE_3BYTE_BGR);
// tag.getGraphics().drawImage(src, 0, 0, deskWidth, deskHeight, null); //绘制缩小后的图
// FileOutputStream deskImage = new FileOutputStream(deskURL); //输出到文件流
// JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(deskImage);
// encoder.encode(tag); //近JPEG编码
// deskImage.close();
// }
public static void main(String args[]) throws Exception {
ImageCompressUtil.zipImageFile("D:\\workspace-test\\xzl\\seed-java\\resources\\image\\220210726172031.jpg", 280, 280, 1f, "x2");
}
}
Java 图片压缩 ，JPEGImageEncoder JPEGEncodeParam 过期解决
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转载自blog.csdn.net/weixin_39472101/article/details/119612960
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