package com.sandu.common.file;
|
|
import org.apache.pdfbox.pdmodel.PDDocument;
|
import org.apache.pdfbox.rendering.ImageType;
|
import org.apache.pdfbox.rendering.PDFRenderer;
|
import org.bytedeco.javacv.FFmpegFrameGrabber;
|
import org.bytedeco.javacv.Frame;
|
import org.bytedeco.javacv.Java2DFrameConverter;
|
import org.springframework.context.annotation.Configuration;
|
|
|
import javax.imageio.ImageIO;
|
import java.awt.*;
|
import java.awt.image.BufferedImage;
|
import java.io.File;
|
import java.io.IOException;
|
import java.io.InputStream;
|
import java.util.Arrays;
|
|
@Configuration
|
public class FileToThumbnail {
|
/**
|
* <p>Title: thumbnailImage</p>
|
* <p>Description: 根据图片路径生成缩略图 </p>
|
*
|
* @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 void getThumbnailForPic(String imagePath, int w, int h, String prevfix, boolean force) throws IOException {
|
File imgFile = new File(imagePath);
|
if (imgFile.exists()) {
|
// 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) {
|
System.out.println("Sorry, the image suffix is illegal. the standard image suffix is {}." + types);
|
return;
|
}
|
System.out.println("target image's size, width:{" + w + "}, height:{" + h + "}.");
|
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)));
|
}
|
} else {
|
if (height > h) {
|
w = Integer.parseInt(new java.text.DecimalFormat("0").format(width * h / (height * 1.0)));
|
}
|
}
|
}
|
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
|
ImageIO.write(bi, suffix, new File(p.substring(0, p.lastIndexOf(File.separator)) + File.separator + prevfix + imgFile.getName()));
|
}
|
}
|
|
|
/**
|
* 通过PDFbox生成文件的缩略图
|
*
|
* @param filePath：文件路径
|
* @param outPath：输出图片路径
|
* @throws IOException
|
*/
|
public String getThumbnailForPdf(String filePath, String outPath) throws IOException {
|
// 利用PdfBox生成图像
|
PDDocument pdDocument = PDDocument.load(new File(filePath));
|
PDFRenderer renderer = new PDFRenderer(pdDocument);
|
// 构造图片
|
BufferedImage img_temp = renderer.renderImageWithDPI(0, 30, ImageType.RGB);
|
ImageIO.write(img_temp, "png", new File(outPath));
|
pdDocument.close();
|
return outPath;
|
}
|
|
/**
|
* @param sourcePath 保存路径
|
* @return String 保存路径
|
* @description //生成视频缩略图的URL地址
|
*/
|
public String getThumbnailForVideo(InputStream inputStream, String sourcePath) throws IOException {
|
File targetFile = new File(sourcePath);
|
|
FFmpegFrameGrabber ff = new FFmpegFrameGrabber(inputStream);
|
ff.start();
|
// 视频总帧数
|
int videoLength = ff.getLengthInFrames();
|
Frame f = null;
|
int i = 0;
|
while (i < videoLength) {
|
// 过滤前20帧,因为前20帧可能是全黑的
|
// 这里看需求，也可以直接根据帧数取图片
|
f = ff.grabFrame();
|
if (i > 20 && f.image != null) {
|
break;
|
}
|
i++;
|
}
|
int owidth = f.imageWidth;
|
int oheight = f.imageHeight;
|
// 对截取的帧进行等比例缩放
|
int width = 300;
|
int height = (int) (((double) width / owidth) * oheight);
|
Java2DFrameConverter converter = new Java2DFrameConverter();
|
BufferedImage fecthedImage = converter.getBufferedImage(f);
|
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
|
bi.getGraphics().drawImage(fecthedImage.getScaledInstance(width, height, Image.SCALE_SMOOTH),
|
0, 0, null);
|
ImageIO.write(bi, "png", targetFile);
|
// 查看stop源码会自动关流
|
ff.stop();
|
return sourcePath;
|
|
}
|
|
|
}
|
