从网上找的不错的压缩图片工具
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import com.common.config.ConfigAccess;
import com.ligitalsoft.model.approvemsg.enterprisemsg.enterprise.Process_qyjbxx;
import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
* <b>function:</b> 缩放图片工具类，创建缩略图、伸缩图片比例
* @author hoojo
* @createDate 2012-2-3 上午10:08:47
* @file ScaleImageUtils.java
* @version 1.0
*/
public class ScaleImageUtils {
private static final float DEFAULT_SCALE_QUALITY = 1f;
private static final String DEFAULT_IMAGE_FORMAT = ".jpg"; // 图像文件的格式
private static final String DEFAULT_FILE_PATH = "D:/scaleImage/scaleImage-";
/**
* <b>function:</b> 设置图片压缩质量枚举类；
* Some guidelines: 0.75 high quality、0.5 medium quality、0.25 low quality
* @author hoojo
* @createDate 2012-2-7 上午11:31:45
* @file ScaleImageUtils.java
* @package com.hoo.util
* @project JQueryMobile
* @blog http://blog.csdn.net/IBM_hoojo
* @email hoojo_@126.com
* @version 1.0
*/
public enum ImageQuality {
max(1.0f), high(0.75f), medium(0.5f), low(0.25f);
private Float quality;
public Float getQuality() {
return this.quality;
}
ImageQuality(Float quality) {
this.quality = quality;
}
}
private static Image image;
/**
* <b>function:</b> 通过目标对象的大小和标准（指定）大小计算出图片缩小的比例
* @author hoojo
* @createDate 2012-2-6 下午04:41:48
* @param targetWidth 目标的宽度
* @param targetHeight 目标的高度
* @param standardWidth 标准（指定）宽度
* @param standardHeight 标准（指定）高度
@return 最小的合适比例
*/
public static double getScaling(double targetWidth, double targetHeight,
double standardWidth, double standardHeight)
{
double widthScaling = 0d;
double heightScaling = 0d;
if (targetWidth > standardWidth) {
widthScaling = standardWidth / (targetWidth * 1.00d);
} else {
widthScaling = 1d;
}
if (targetHeight > standardHeight) {
heightScaling = standardHeight / (targetHeight * 1.00d);
} else {
heightScaling = 1d;
}
return Math.min(widthScaling, heightScaling);
}
/**
* <b>function:</b> 将Image的宽度、高度缩放到指定width、height，并保存在savePath目录
* @author hoojo
* @createDate 2012-2-6 下午04:54:35
* @param width 缩放的宽度
* @param height 缩放的高度
* @param savePath 保存目录
* @param targetImage 即将缩放的目标图片
* @return 图片保存路径、名称
* @throws ImageFormatException
* @throws IOException
*/
public static String resize(int width, int height, String savePath, Image targetImage) throws ImageFormatException, IOException {
width = Math.max(width, 1);
height = Math.max(height, 1);
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
image.getGraphics().drawImage(targetImage, 0, 0, width, height, null);
if (savePath == null || "".equals(savePath)) {
savePath = DEFAULT_FILE_PATH + System.currentTimeMillis() + DEFAULT_IMAGE_FORMAT;
}
FileOutputStream fos = new FileOutputStream(new File(savePath));
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);
encoder.encode(image);
image.flush();
fos.flush();
fos.close();
return savePath;
}
/**
* <b>function:</b> 可以设置图片缩放质量，并且可以根据指定的宽高缩放图片
* @author hoojo
* @createDate 2012-2-7 上午11:01:27
* @param width 缩放的宽度
* @param height 缩放的高度
* @param quality 图片压缩质量，最大值是1； 使用枚举值：{@link ImageQuality}
* Some guidelines: 0.75 high quality、0.5 medium quality、0.25 low quality
* @param savePath 保存目录
* @param targetImage 即将缩放的目标图片
* @return 图片保存路径、名称
* @throws ImageFormatException
* @throws IOException
*/
public static String resize(int width, int height, Float quality, String savePath, Image targetImage) throws ImageFormatException, IOException {
width = Math.max(width, 1);
height = Math.max(height, 1);
int[] size = getSize(width, height, targetImage);
BufferedImage image = new BufferedImage(size[0], size[1], BufferedImage.TYPE_INT_RGB);
image.getGraphics().drawImage(targetImage, 0, 0, size[0], size[1], null);
if (savePath == null || "".equals(savePath)) {
savePath = DEFAULT_FILE_PATH + System.currentTimeMillis() + DEFAULT_IMAGE_FORMAT;
}
FileOutputStream fos = new FileOutputStream(new File(savePath));
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);
JPEGEncodeParam encodeParam = JPEGCodec.getDefaultJPEGEncodeParam(image);
if (quality == null || quality <= 0) {
quality = DEFAULT_SCALE_QUALITY;
}
/** 设置图片压缩质量 */
encodeParam.setQuality(quality, true);
encoder.encode(image, encodeParam);
image.flush();
fos.flush();
fos.close();
return savePath;
}
/**
* <b>function:</b> 通过指定大小和图片的大小，计算出图片缩小的合适大小
* @author hoojo
* @createDate 2012-2-6 下午05:53:10
* @param width 指定的宽度
* @param height 指定的高度
* @param image 图片文件
* @return 返回宽度、高度的int数组
*/
public static int[] getSize(int width, int height, Image image) {
int targetWidth = image.getWidth(null);
int targetHeight = image.getHeight(null);
if(targetWidth<=width && targetHeight<=height){
width = targetWidth;
height = targetHeight;
}
double scaling = getScaling(targetWidth, targetHeight, width, height);
long standardWidth = Math.round(targetWidth * scaling);
long standardHeight = Math.round(targetHeight * scaling);
return new int[] { Integer.parseInt(Long.toString(standardWidth)), Integer.parseInt(String.valueOf(standardHeight)) };
}
/**
* <b>function:</b> 通过指定的比例和图片对象，返回一个放大或缩小的宽度、高度
* @author hoojo
* @createDate 2012-2-7 上午10:27:59
* @param scale 缩放比例
* @param image 图片对象
* @return 返回宽度、高度
*/
public static int[] getSize(float scale, Image image) {
int targetWidth = image.getWidth(null);
int targetHeight = image.getHeight(null);
long standardWidth = Math.round(targetWidth * scale);
long standardHeight = Math.round(targetHeight * scale);
return new int[] { Integer.parseInt(Long.toString(standardWidth)), Integer.parseInt(String.valueOf(standardHeight)) };
}
public static int[] getSize(int width, Image image) {
int targetWidth = image.getWidth(null);
int targetHeight = image.getHeight(null);
long height = Math.round((targetHeight * width) / (targetWidth * 1.00f));
return new int[] { width, Integer.parseInt(String.valueOf(height)) };
}
public static int[] getSizeByHeight(int height, Image image) {
int targetWidth = image.getWidth(null);
int targetHeight = image.getHeight(null);
long width = Math.round((targetWidth * height) / (targetHeight * 1.00f));
return new int[] { Integer.parseInt(String.valueOf(width)), height };
}
/**
* <b>function:</b> 将指定的targetFile图片文件的宽度、高度大于指定width、height的图片缩小，并保存在savePath目录
* @author hoojo
* @createDate 2012-2-6 下午04:57:02
* @param width 缩小的宽度
* @param height 缩小的高度
* @param savePath 保存目录
* @param targetImage 改变的目标图片
* @return 图片保存路径、名称
* @throws ImageFormatException
* @throws IOException
*/
public static String resize(int width, int height, String savePath, File targetFile) throws ImageFormatException, IOException {
image = ImageIO.read(targetFile);
int[] size = getSize(width, height, image);
return resize(size[0], size[1], savePath, image);
}
/**
* <b>function:</b> 将指定的targetURL网络图片文件的宽度、高度大于指定width、height的图片缩小，并保存在savePath目录
* @author hoojo
* @createDate 2012-2-6 下午04:57:07
* @param width 缩小的宽度
* @param height 缩小的高度
* @param savePath 保存目录
* @param targetImage 改变的目标图片
* @return 图片保存路径、名称
* @throws ImageFormatException
* @throws IOException
*/
public static String resize(int width, int height, String savePath, URL targetURL) throws ImageFormatException, IOException {
image = ImageIO.read(targetURL);
int[] size = getSize(width, height, image);
return resize(size[0], size[1], savePath, image);
}
/**
* <b>function:</b> 将一个本地的图片文件按照指定的比例进行缩放
* @author hoojo
* @createDate 2012-2-7 上午10:29:18
* @param scale 缩放比例
* @param savePath 保存文件路径、名称
* @param targetFile 本地图片文件
* @return 新的文件名称
* @throws ImageFormatException
* @throws IOException
*/
public static String resize(float scale, String savePath, File targetFile) throws ImageFormatException, IOException {
image = ImageIO.read(targetFile);
int[] size = getSize(scale, image);
return resize(size[0], size[1], savePath, image);
}
/**
* <b>function:</b> 将一个网络图片文件按照指定的比例进行缩放
* @author hoojo
* @createDate 2012-2-7 上午10:30:56
* @param scale 缩放比例
* @param savePath 保存文件路径、名称
* @param targetFile 本地图片文件
* @return 新的文件名称
* @throws ImageFormatException
* @throws IOException
*/
public static String resize(float scale, String savePath, URL targetURL) throws ImageFormatException, IOException {
image = ImageIO.read(targetURL);
int[] size = getSize(scale, image);
return resize(size[0], size[1], savePath, image);
}
/**
* <b>function:</b> 按照固定宽度进行等比缩放本地图片
* @author hoojo
* @createDate 2012-2-7 上午10:49:56
* @param width 固定宽度
* @param savePath 保存路径、名称
* @param targetFile 本地目标文件
* @return 返回保存路径
* @throws ImageFormatException
* @throws IOException
*/
public static String resize(int width, String savePath, File targetFile) throws ImageFormatException, IOException {
image = ImageIO.read(targetFile);
int[] size = getSize(width, image);
return resize(size[0], size[1], savePath, image);
}
/**
* <b>function:</b> 按照固定宽度进行等比缩放网络图片
* @author hoojo
* @createDate 2012-2-7 上午10:50:52
* @param width 固定宽度
* @param savePath 保存路径、名称
* @param targetFile 本地目标文件
* @return 返回保存路径
* @throws ImageFormatException
* @throws IOException
*/
public static String resize(int width, String savePath, URL targetURL) throws ImageFormatException, IOException {
image = ImageIO.read(targetURL);
int[] size = getSize(width, image);
return resize(size[0], size[1], savePath, image);
}
/**
* <b>function:</b> 按照固定高度进行等比缩放本地图片
* @author hoojo
* @createDate 2012-2-7 上午10:51:17
* @param height 固定高度
* @param savePath 保存路径、名称
* @param targetFile 本地目标文件
* @return 返回保存路径
* @throws ImageFormatException
* @throws IOException
*/
public static String resizeByHeight(int height, String savePath, File targetFile) throws ImageFormatException, IOException {
image = ImageIO.read(targetFile);
int[] size = getSizeByHeight(height, image);
return resize(size[0], size[1], savePath, image);
}
/**
* <b>function:</b> 按照固定高度进行等比缩放网络图片
* @author hoojo
* @createDate 2012-2-7 上午10:52:23
* @param height 固定高度
* @param savePath 保存路径、名称
* @param targetFile 本地目标文件
* @return 返回保存路径
* @throws ImageFormatException
* @throws IOException
*/
public static String resizeByHeight(int height, String savePath, URL targetURL) throws ImageFormatException, IOException {
image = ImageIO.read(targetURL);
int[] size = getSizeByHeight(height, image);
return resize(size[0], size[1], savePath, image);
}
}
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