thumbnailator工具以及Java原生的图片处理工具类，效率上还是原生的较好，不过thumbnailator提供的功能较全面也较简单，需要注意的是thumbnailator处理png格式的图片时，如果遇到透明背景的话，会处理成黑色的背景，处理方法就是在使用thumbnailator处理png图像之前将其背景图设置为白色，这是最简单有效的办法，各位看官如果有其他行之有效的方法，欢迎随时留言
package com.*.util;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import net.coobird.thumbnailator.Thumbnailator;
import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Positions;
public class ImageUtils
{
/**
* jpg文件格式
*/
public static String JPG = "jpg";
/**
* png文件格式
*/
public static String PNG = "png";
/**
* 图片裁剪工具
*
* @param in
* ******************输入流
* @param readImageFormat
* *****图片格式
* @param x
* *******************起始点x坐标
* @param y
* *******************起始点y坐标
* @param w
* *******************裁剪宽度
* @param h
* *******************裁剪高度
* @return is*****************输出流
* @author Jieve
* @throws IOException
*/
public static InputStream cutImage(InputStream in, String readImageFormat, int x, int y, int w, int h) throws IOException
{
Iterator iterator = ImageIO.getImageReadersByFormatName(readImageFormat);
ImageReader reader = (ImageReader) iterator.next();
ImageInputStream iis = ImageIO.createImageInputStream(in);
reader.setInput(iis, true);
ImageReadParam param = reader.getDefaultReadParam();
Rectangle rect = new Rectangle(x, y, w, h);
param.setSourceRegion(rect);
BufferedImage bi = reader.read(0, param);
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(bi, readImageFormat, os);
InputStream is = new ByteArrayInputStream(os.toByteArray());
in.close();
os.close();
return is;
}
/**
* 根据图片对象获取对应InputStream
*
* @param image
* @param readImageFormat
* @return
* @throws IOException
*/
public static InputStream getInputStream(BufferedImage image, String readImageFormat) throws IOException
{
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(image, readImageFormat, os);
InputStream is = new ByteArrayInputStream(os.toByteArray());
os.close();
return is;
}
/**
* 生成缩略图
*
* @param in
* @param size
* @param imageFormat
* @return
* @throws IOException
*/
public static InputStream createThumbnails(InputStream in, int size, String imageFormat) throws IOException
{
if(imageFormat.equalsIgnoreCase("jpg"))
{
return createThumbnails(in, size);
}
else if(imageFormat.equalsIgnoreCase("png"))
{
BufferedImage image = Thumbnails.of(in).scale(1f).outputFormat(JPG).asBufferedImage();
InputStream is = getInputStream(image, JPG);
return createThumbnails(is, size);
}
return null;
}
/**
* 转化为jpg格式
*
* @param in
* @param imageFormat
* @return
* @throws IOException
*/
public static BufferedImage toJPG(BufferedImage image) throws IOException{
int width = image.getWidth();
int height = image.getHeight();
BufferedImage image_ = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D graphic = image_.createGraphics();
graphic.setColor(Color.WHITE);
graphic.fillRect(0,0,width,height);
graphic.drawRenderedImage(image, null);
graphic.dispose();
return image_;
}
/**
* 生成缩略图
*
* @param in
* @param width
* @param height
* @return
* @throws IOException
*/
public static InputStream createThumbnails(InputStream in, int width, int height) throws IOException
{
ByteArrayOutputStream os = new ByteArrayOutputStream();
Thumbnailator.createThumbnail(in, os, width, height);
InputStream is = new ByteArrayInputStream(os.toByteArray());
in.close();
os.close();
return is;
}
/**
* 生成缩略图
*
* @param in
* @param size
* @return
* @throws IOException
*/
public static InputStream createThumbnails(InputStream in, int size) throws IOException
{
ByteArrayOutputStream os = new ByteArrayOutputStream();
Thumbnailator.createThumbnail(in, os, size, size);
InputStream is = new ByteArrayInputStream(os.toByteArray());
in.close();
os.close();
return is;
}
/**
* 添加水印
*
* @param in
* @param width
* @param height
* @return
* @throws IOException
*/
public static InputStream addWaterMark(InputStream in, InputStream waterMark, int width, int height) throws IOException
{
ByteArrayOutputStream os = new ByteArrayOutputStream();
Thumbnails.of(in).size(width, height).watermark(Positions.BOTTOM_RIGHT, ImageIO.read(waterMark), 0.4f).outputQuality(0.8f).toOutputStream(os);
InputStream is = new ByteArrayInputStream(os.toByteArray());
in.close();
waterMark.close();
os.close();
return is;
}
/**
* 居中裁剪
*
* @param image
* @return
*/
public static BufferedImage clipCenter(BufferedImage image)
{
int height = image.getHeight();
int width = image.getWidth();
int size = height >= width ? width : height;
int temp = 0;
if(height >= width)
{
temp = (height - width) / 2;
image = image.getSubimage(0, temp, size, size);
}
else
{
temp = (width - height) / 2;
image = image.getSubimage(temp, 0, size, size);
}
return image;
}
/**
* 裁剪图片
*
* @param image
* @param x
* @param y
* @param size
* @return
*/
public static BufferedImage cutImage(BufferedImage image, int x, int y, int size)
{
int height = image.getHeight();
int width = image.getWidth();
if((width >= (x + size)) && (height >= (y + size)))
{
image = image.getSubimage(x, y, size, size);
}
else
{
int temp = ((height - y) >= (width - x)) ? (width - x) : (height - y);
image = image.getSubimage(x, y, temp, temp);
}
return image;
}
/**
* 检查格式是否合法
*
* @param imageType
* @return
*/
public static boolean checkType(String imageType)
{
boolean flag = false;
if(JPG.equalsIgnoreCase(imageType) || PNG.equalsIgnoreCase(imageType))
{
flag = true;
}
return flag;
}
/**
* 压缩图片
* 默认输出50%质量图片
*
* @param image
* @return
* @throws IOException
*/
public static InputStream compress(BufferedImage image, String readImageFormat) throws IOException
{
InputStream in = ImageUtils.getInputStream(image, readImageFormat);
ByteArrayOutputStream os = new ByteArrayOutputStream();
Thumbnails.of(in).size(image.getWidth(), image.getHeight()).outputQuality(0.5f).toOutputStream(os);
InputStream is = new ByteArrayInputStream(os.toByteArray());
in.close();
os.close();
return is;
}
}
http://blog.csdn.net/jieve_y/article/details/51283748