圖片壓縮，旋轉等

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Positions;
import javax.imageio.ImageIO;

public class ThumbnailatorTest {

/**
*
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
ThumbnailatorTest thumbnailatorTest = new ThumbnailatorTest();
thumbnailatorTest.test1();
thumbnailatorTest.test2();
thumbnailatorTest.test3();
thumbnailatorTest.test4();
thumbnailatorTest.test5();
thumbnailatorTest.test6();
thumbnailatorTest.test7();
thumbnailatorTest.test8();
thumbnailatorTest.test9();
}

/**
* 指定大小進行縮放
*
* @throws IOException
*/
private void test1() throws IOException {
/*
* size(width,height) 若圖片橫比200小，高比300小，不變
* 若圖片橫比200小，高比300大，高縮小到300，圖片比例不變 若圖片橫比200大，高比300小，橫縮小到200，圖片比例不變
* 若圖片橫比200大，高比300大，圖片按比例縮小，橫爲200或高爲300
*/
Thumbnails.of("images/test.jpg").size(200, 300).toFile(
"C:/image_200x300.jpg");
Thumbnails.of("images/test.jpg").size(2560, 2048).toFile(
"C:/image_2560x2048.jpg");
}

/**
* 按照比例進行縮放
*
* @throws IOException
*/
private void test2() throws IOException {
/**
* scale(比例)
*/
Thumbnails.of("images/test.jpg").scale(0.25f)
.toFile("C:/image_25%.jpg");
Thumbnails.of("images/test.jpg").scale(1.10f).toFile(
"C:/image_110%.jpg");
}

/**
* 不按照比例，指定大小進行縮放
*
* @throws IOException
*/
private void test3() throws IOException {
/**
* keepAspectRatio(false) 默認是按照比例縮放的
*/
Thumbnails.of("images/test.jpg").size(120, 120).keepAspectRatio(false)
.toFile("C:/image_120x120.jpg");
}

/**
* 旋轉
*
* @throws IOException
*/
private void test4() throws IOException {
/**
* rotate(角度),正數：順時針 負數：逆時針
*/
Thumbnails.of("images/test.jpg").size(1280, 1024).rotate(90).toFile(
"C:/image+90.jpg");
Thumbnails.of("images/test.jpg").size(1280, 1024).rotate(-90).toFile(
"C:/iamge-90.jpg");
}

/**
* 水印
*
* @throws IOException
*/
private void test5() throws IOException {
/**
* watermark(位置，水印圖，透明度)
*/
Thumbnails.of("images/test.jpg").size(1280, 1024).watermark(
Positions.BOTTOM_RIGHT,
ImageIO.read(new File("images/watermark.png")), 0.5f)
.outputQuality(0.8f).toFile(
"C:/image_watermark_bottom_right.jpg");
Thumbnails.of("images/test.jpg").size(1280, 1024).watermark(
Positions.CENTER,
ImageIO.read(new File("images/watermark.png")), 0.5f)
.outputQuality(0.8f).toFile("C:/image_watermark_center.jpg");
}

/**
* 裁剪
*
* @throws IOException
*/
private void test6() throws IOException {
/**
* 圖片中心400*400的區域
*/
Thumbnails.of("images/test.jpg").sourceRegion(Positions.CENTER, 400,
400).size(200, 200).keepAspectRatio(false).toFile(
"C:/image_region_center.jpg");
/**
* 圖片右下400*400的區域
*/
Thumbnails.of("images/test.jpg").sourceRegion(Positions.BOTTOM_RIGHT,
400, 400).size(200, 200).keepAspectRatio(false).toFile(
"C:/image_region_bootom_right.jpg");
/**
* 指定座標
*/
Thumbnails.of("images/test.jpg").sourceRegion(600, 500, 400, 400).size(
200, 200).keepAspectRatio(false).toFile(
"C:/image_region_coord.jpg");
}

/**
* 轉化圖像格式
*
* @throws IOException
*/
private void test7() throws IOException {
/**
* outputFormat(圖像格式)
*/
Thumbnails.of("images/test.jpg").size(1280, 1024).outputFormat("png")
.toFile("C:/image_1280x1024.png");
Thumbnails.of("images/test.jpg").size(1280, 1024).outputFormat("gif")
.toFile("C:/image_1280x1024.gif");
}

/**
* 輸出到OutputStream
*
* @throws IOException
*/
private void test8() throws IOException {
/**
* toOutputStream(流對象)
*/
OutputStream os = new FileOutputStream(
"C:/image_1280x1024_OutputStream.png");
Thumbnails.of("images/test.jpg").size(1280, 1024).toOutputStream(os);
}

/**
* 輸出到BufferedImage
*
* @throws IOException
*/
private void test9() throws IOException {
/**
* asBufferedImage() 返回BufferedImage
*/
BufferedImage thumbnail = Thumbnails.of("images/test.jpg").size(1280,
1024).asBufferedImage();
ImageIO.write(thumbnail, "jpg", new File(
"C:/image_1280x1024_BufferedImage.jpg"));
}
}

 

/**
* 輸出到byte[]
* 
* @throws IOException
*/
private byte[] test10(byte[] source,String fileName) throws IOException {

byte[] byteArray=null;
ByteArrayInputStream intputStream = new ByteArrayInputStream(source);
log.info("壓縮以前byte數組大小={}",source.length);
//寬、高比1000,1200大的都壓縮到1000,1200，小的話保持不變
Thumbnails.Builder<? extends InputStream> builder = Thumbnails.of(intputStream).size(1000, 1200);
bufferedImage = builder.asBufferedImage();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
String formatName=fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();//圖片後綴名
ImageIO.write(bufferedImage, formatName, baos);
byteArray = baos.toByteArray();
log.info("壓縮以後byte數組大小={}",byteArray.length)

return byteArray;

}
}

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版權聲明：本文爲CSDN博主「cnsu-cmh」的原創文章，遵循CC 4.0 by-sa版權協議，轉載請附上原文出處連接及本聲明。
原文連接：https://blog.csdn.net/u011229848/article/details/78434914