net.unmz.java.util.images.ImageUtils Maven / Gradle / Ivy
package net.unmz.java.util.images;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
/**
* Project Name:
* 功能描述：
*
* @author [email protected]
* @version 1.0
* @date 2019-10-31 17:50
* @since JDK 1.8
*/
public class ImageUtils {
/**
* 指定图片宽度和高度和压缩比例对图片进行压缩
*
* @param imageSrc 源图片地址
* @param imgDist 目标图片地址
*/
public static void reduceImg(String imageSrc, String imgDist) {
try {
File srcFile = new File(imageSrc);
File dist = new File(imgDist);
reduceImage(srcFile, dist);
} catch (Exception ef) {
ef.printStackTrace();
}
}
/**
* 指定图片宽度和高度和压缩比例对图片进行压缩
*
* @param srcFile 源图片地址
* @param imgDist 目标图片地址
*/
public static void reduceImg(File srcFile, File imgDist) {
try {
reduceImage(srcFile, imgDist);
} catch (Exception ef) {
ef.printStackTrace();
}
}
private static void reduceImage(File srcFile, File imgDist) throws IOException {
// 检查图片文件是否存在
if (!srcFile.exists()) {
throw new RuntimeException("文件不存在");
}
int[] results = getImgWidthHeight(srcFile);
int widthDist = results[0];
int heightDist = results[1];
// 开始读取文件并进行压缩
Image src = ImageIO.read(srcFile);
// 构造一个类型为预定义图像类型之一的 BufferedImage
BufferedImage tag = new BufferedImage(widthDist, heightDist, BufferedImage.TYPE_INT_RGB);
// 这边是压缩的模式设置
tag.getGraphics().drawImage(src.getScaledInstance(widthDist, heightDist, Image.SCALE_SMOOTH), 0, 0, null);
//创建文件输出流
FileOutputStream out = new FileOutputStream(imgDist);
//将图片按JPEG压缩，保存到out中
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(tag);
//关闭文件输出流
out.close();
}
/**
* 获取图片宽度和高度
*
* @param file 图片路径
* @return 返回图片的宽度
*/
public static int[] getImgWidthHeight(File file) {
InputStream is;
BufferedImage src;
int result[] = {0, 0};
try {
// 获得文件输入流
is = new FileInputStream(file);
// 从流里将图片写入缓冲图片区
src = ImageIO.read(is);
// 得到源图片宽
result[0] = src.getWidth(null);
// 得到源图片高
result[1] = src.getHeight(null);
is.close(); //关闭输入流
} catch (Exception ef) {
ef.printStackTrace();
}
return result;
}
}