package com.hoo.util;
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 javax.imageio.ImageIO;
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> 縮放圖片工具類，創建縮略圖、伸縮圖片比例
* @author hoojo
* @createDate 2012-2-3 上午10:08:47
* @file ScaleImageUtils.java
* @package com.hoo.util
* @blog http://blog.csdn.net/IBM_hoojo
* http://hoojo.cnblogs.com
* @email hoojo_@126.com
* @version 1.0
*/
public abstract class ScaleImageUtils {
private static final float DEFAULT_SCALE_QUALITY = 1f;
private static final String DEFAULT_IMAGE_FORMAT = ".jpg"; // 圖像文件的格式
private static final String DEFAULT_FILE_PATH = "C:/temp-";
/**
* <b>function:</b> 設置圖片壓縮質量枚舉類；
* 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> 通過目標對象的大小和標準（指定）大小計算出圖片縮小的比例
* @author hoojo
* @createDate 2012-2-6 下午04:41:48
* @param targetWidth 目標的寬度
* @param targetHeight 目標的高度
* @param standardWidth 標準（指定）寬度
* @param standardHeight 標準（指定）高度
* @return 最小的合適比例
*/
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> 將Image的寬度、高度縮放到指定width、height，并保存在savePath目錄
* @author hoojo
* @createDate 2012-2-6 下午04:54:35
* @param width 縮放的寬度
* @param height 縮放的高度
* @param savePath 保存目錄
* @param targetImage 即將縮放的目標圖片
* @return 圖片保存路徑、名稱
* @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> 可以設置圖片縮放質量，并且可以根據指定的寬高縮放圖片
* @author hoojo
* @createDate 2012-2-7 上午11:01:27
* @param width 縮放的寬度
* @param height 縮放的高度
* @param quality 圖片壓縮質量，最大值是1； 使用枚舉值：{@link ImageQuality} * Some guidelines: 0.75 high quality、0.5 medium quality、0.25 low quality
* @param savePath 保存目錄
* @param targetImage 即將縮放的目標圖片
* @return 圖片保存路徑、名稱
* @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);
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);
JPEGEncodeParam encodeParam = JPEGCodec.getDefaultJPEGEncodeParam(image);
if (quality == null || quality <= 0) { quality = DEFAULT_SCALE_QUALITY;
}
/** 設置圖片壓縮質量 */
encodeParam.setQuality(quality, true);
encoder.encode(image, encodeParam);
image.flush();
fos.flush();
fos.close();
return savePath;
}
/**
* <b>function:</b> 通過指定大小和圖片的大小，計算出圖片縮小的合適大小
* @author hoojo
* @createDate 2012-2-6 下午05:53:10
* @param width 指定的寬度
* @param height 指定的高度
* @param image 圖片文件
* @return 返回寬度、高度的int數組
*/
public static int[] getSize(int width, int height, Image image) { int targetWidth = image.getWidth(null);
int targetHeight = image.getHeight(null);
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> 通過指定的比例和圖片對象，返回一個放大或縮小的寬度、高度
* @author hoojo
* @createDate 2012-2-7 上午10:27:59
* @param scale 縮放比例
* @param image 圖片對象
* @return 返回寬度、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> 將指定的targetFile圖片文件的寬度、高度大于指定width、height的圖片縮小，并保存在savePath目錄
* @author hoojo
* @createDate 2012-2-6 下午04:57:02
* @param width 縮小的寬度
* @param height 縮小的高度
* @param savePath 保存目錄
* @param targetImage 改變的目標圖片
* @return 圖片保存路徑、名稱
* @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> 將指定的targetURL網絡圖片文件的寬度、高度大于指定width、height的圖片縮小，并保存在savePath目錄
* @author hoojo
* @createDate 2012-2-6 下午04:57:07
* @param width 縮小的寬度
* @param height 縮小的高度
* @param savePath 保存目錄
* @param targetImage 改變的目標圖片
* @return 圖片保存路徑、名稱
* @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> 將一個本地的圖片文件按照指定的比例進行縮放
* @author hoojo
* @createDate 2012-2-7 上午10:29:18
* @param scale 縮放比例
* @param savePath 保存文件路徑、名稱
* @param targetFile 本地圖片文件
* @return 新的文件名稱
* @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> 將一個網絡圖片文件按照指定的比例進行縮放
* @author hoojo
* @createDate 2012-2-7 上午10:30:56
* @param scale 縮放比例
* @param savePath 保存文件路徑、名稱
* @param targetFile 本地圖片文件
* @return 新的文件名稱
* @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> 按照固定寬度進行等比縮放本地圖片
* @author hoojo
* @createDate 2012-2-7 上午10:49:56
* @param width 固定寬度
* @param savePath 保存路徑、名稱
* @param targetFile 本地目標文件
* @return 返回保存路徑
* @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> 按照固定寬度進行等比縮放網絡圖片
* @author hoojo
* @createDate 2012-2-7 上午10:50:52
* @param width 固定寬度
* @param savePath 保存路徑、名稱
* @param targetFile 本地目標文件
* @return 返回保存路徑
* @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> 按照固定高度進行等比縮放本地圖片
* @author hoojo
* @createDate 2012-2-7 上午10:51:17
* @param height 固定高度
* @param savePath 保存路徑、名稱
* @param targetFile 本地目標文件
* @return 返回保存路徑
* @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> 按照固定高度進行等比縮放網絡圖片
* @author hoojo
* @createDate 2012-2-7 上午10:52:23
* @param height 固定高度
* @param savePath 保存路徑、名稱
* @param targetFile 本地目標文件
* @return 返回保存路徑
* @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);
}
/**
* <b>function:</b>
* @author hoojo
* @createDate 2012-2-3 上午10:08:47
* @param args
* @throws IOException
* @throws MalformedURLException
* @throws ImageFormatException
*/
public static void main(String[] args) throws ImageFormatException, MalformedURLException, IOException {
System.out.println(ScaleImageUtils.resize(140, 140, null, new URL("http://www.open-open.com/lib/images/logo.jpg"))); ScaleImageUtils.resize(100, 100, ImageQuality.high.getQuality(), null, ImageIO.read(new URL("http://www.open-open.com/lib/images/logo.jpg"))); }
}