Thumbnailator图像处理

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package com.hand.emp.test;

import java.io.File;

import java.io.IOException;

import java.util.logging.Level;

import java.util.logging.Logger;

import net.coobird.thumbnailator.Thumbnails;

import org.junit.Test;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;

import net.coobird.thumbnailator.builders.BufferedImageBuilder;

import net.coobird.thumbnailator.geometry.Positions;

import net.coobird.thumbnailator.Thumbnails.Builder;

import java.math.BigDecimal;

/**

*

* @author JP

*/

public class TestThumbnailator {

String outputBasePth = "D:\\pictures\\thumbnail\\";

String resourceFilePath = "D:\\pictures\\yu1.jpg";

// @Test

public void TestChangeFormat() {

try {

Thumbnails.of(resourceFilePath)

.scale(0.5f)//there must be size or scale

.outputFormat("png")

.toFile(new File(outputBasePth + "PicFormat1.png"));// .toFile(new File(dicString + "t1.png"));

//Allow no suffix

//if the name of the file is same,the new one will cover the old one

} catch (IOException ex) {

Logger.getLogger(TestThumbnailator.class.getName()).log(Level.SEVERE, null, ex);

}

}

// @Test

public void TestChangeSize() {

try {

Thumbnails.of(resourceFilePath)

.forceSize(800, 300)

.toFile(new File(outputBasePth + "PicSize1.png"));

/**

* the picture will be stretched if you want get a new one which can

* be the size you need and wouldn`t be stretched, you should

* computing it`s own scale -->can call TestChangeSizeNotStrexched

*/

} catch (IOException ex) {

Logger.getLogger(TestThumbnailator.class.getName()).log(Level.SEVERE, null, ex);

}

}

// @Test

public void TestChangeSizeNotStrexched() {

String outputPath = outputBasePth + "Notstretched1";

int target_width = 1000;

int target_height = 2000;

String target_suffix = "jpg";

cover(resourceFilePath, outputPath, target_width, target_height, target_suffix);

}

// @Test

public void TestWaterMark() {

try {

//给图片加水印，watermark(position，waterPictureFile，透明度)

Thumbnails.of(resourceFilePath).scale(2f)

.watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File("D:\\pictures\\timg.jpg")), 0.6f)

.outputQuality(0.8f).toFile(outputBasePth+"Picwatermark.jpg");

} catch (IOException ex) {

Logger.getLogger(TestThumbnailator.class.getName()).log(Level.SEVERE, null, ex);

}

}

@Test

public void TestRotate(){

try {

//rotate picture

Thumbnails.of(resourceFilePath).scale(2f)

.rotate(90.0)

.outputQuality(0.8f).toFile(outputBasePth+"PicRotate.jpg");

} catch (IOException ex) {

Logger.getLogger(TestThumbnailator.class.getName()).log(Level.SEVERE, null, ex);

}

}

public static void cover(String sourceFile, String targetFile, int targetWidth, int targetHeight, String target_suffix) {

File fromFile = new File(sourceFile);

BufferedImage srcImage = null;

int s_height = 0;

int s_width = 0;

try {

srcImage = ImageIO.read(fromFile);

// 获取源文件的宽高

s_height = srcImage.getHeight();

s_width = srcImage.getWidth();

System.out.println(s_height + "");

System.out.println(s_width + "");

} catch (IOException e1) {

e1.printStackTrace();

}

// 判断是否需要压缩

if (targetWidth != s_width || targetHeight != s_height) {// 需要压缩

BigDecimal n = new BigDecimal(s_height).divide(new BigDecimal(s_width), 10, BigDecimal.ROUND_UP);// 源图片文件高/宽 的比例

BigDecimal m = new BigDecimal(targetHeight).divide(new BigDecimal(targetWidth), 10, BigDecimal.ROUND_UP);// 目标图片文件高/宽 的比例

System.out.println(n + "");

System.out.println(m + "");

int flag = n.compareTo(m); //比较源图片文件和目标图片 的高/宽 比

try {

if (flag == 0) {// n == m，高/宽 比一致, 无需裁减, 直接压缩

System.out.println("flag： " + flag);

Thumbnails.of(sourceFile).forceSize(targetWidth, targetHeight).outputFormat(target_suffix).toFile(new File(targetFile));

} else { // 高/宽 比不一致，需要裁减

if (flag > 0) {// 高的比例 > 宽的比例，以宽的比例进行缩放， 需要裁减高

srcImage = Thumbnails.of(sourceFile).width(targetWidth).asBufferedImage();//以宽的比例进行缩放

} else if (flag < 0) {// n < m 高的比例 < 宽的比例，以高的比例进行缩放， 需要裁减宽

srcImage = Thumbnails.of(sourceFile).height(targetHeight).asBufferedImage();//以高的比例进行缩放

}

// 居中裁减

Builder<BufferedImage> builder = Thumbnails.of(srcImage)

.sourceRegion(Positions.CENTER, targetWidth, targetHeight).size(targetWidth, targetHeight);

builder.outputFormat(target_suffix).toFile(new File(targetFile));

}

} catch (IOException ex) {

Logger.getLogger(TestThumbnailator.class.getName()).log(Level.SEVERE, null, ex);

}

}

}

}