/** * */package com.fkhwl.fkhserver.core.utils; import java.awt.Image;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream; import javax.imageio.ImageIO; import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder; /** * @ClassName: ThumbnailTools * @Description: 缩略图生成工具 * @author * @date 2014年9月25日 下午5:18:33  */public class ThumbnailTools {     private int fileSize;    private String inPath; // 输入图路径    private String outPath; // 输出图路径    private int width = 100; // 默认输出图片宽    private int height = 100; // 默认输出图片高    private String inFileName; // 输入图文件名    private String outFileName; // 输出图文件名    private boolean proportion = true; // 是否等比缩放标记(默认为等比缩放)    private String prefix = "thumbnail_";     public int getWidth() {        return width;    }     public void setWidth(int width) {        this.width = width;    }     public int getHeight() {        return height;    }     public void setHeight(int height) {        this.height = height;    }         public ThumbnailTools setSize(int size){        this.width = size;        this.height = size;        return this;    }         public ThumbnailTools setSize(int width, int height){        this.width = width;        this.height = height;        return this;    }         public String getInPath() {        return inPath;    }     public void setInPath(String inPath) {        this.inPath = inPath;    }     public String getOutPath() {        return outPath;    }     public void setOutPath(String outPath) {        this.outPath = outPath;    }     public boolean isProportion() {        return proportion;    }     public void setProportion(boolean proportion) {        this.proportion = proportion;    }         public ThumbnailTools(String path){        this.inPath = path;        this.outPath = path;    }     public ThumbnailTools(String inPath, String outPath){        this.inPath = inPath;        this.outPath = outPath;    }         /**     * 生成缩略图     * @param fileName 文件名     * @return boolean     */    public boolean generate(String fileName) throws Exception{        this.generate(fileName, null);        return Boolean.TRUE;    }     /**     * 生成缩略图     * @param fileName 文件名     * @param outFileName 输出文件名     * @return boolean     */    public boolean generate(String fileName, String outFileName) throws Exception{        File file = new File(inPath+fileName);        this.inFileName = fileName;        this.outFileName = null == outFileName ? prefix+inFileName : outFileName;        this.execute(new FileInputStream(file));        return Boolean.TRUE;    }         public boolean generate(InputStream inputStream, String outPath) throws Exception{        this.execute(inputStream);                 return Boolean.TRUE;    }         private void execute(InputStream inputStream) throws Exception {        this.fileSize = inputStream.available();        BufferedImage oldImage = ImageIO.read(inputStream);        if (oldImage.getWidth() == -1) {            System.out.println("Input image cant‘t read or format error.");            return;        }                 int newWidth;        int newHeight;        // 是否是等比缩放        if (this.proportion == true) {            // 为等比缩放计算输出的图片宽度及高度            double rate1 = ((double) oldImage.getWidth()) / (double) width;            double rate2 = ((double) oldImage.getHeight()) / (double) height;            // 根据缩放比率大的进行缩放控制            double rate = rate1 > rate2 ? rate1 : rate2;            newWidth = (int) (((double) oldImage.getWidth()) / rate);            newHeight = (int) (((double) oldImage.getHeight()) / rate);        } else {            newWidth = width; // 输出的图片宽度            newHeight = height; // 输出的图片高度        }        BufferedImage tag = new BufferedImage((int) newWidth, (int) newHeight, BufferedImage.TYPE_INT_RGB);         // Image.SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢        tag.getGraphics().drawImage(oldImage.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH), 0, 0, null);        String newFilePath = outPath+outFileName;        File newFile = new File(newFilePath);        FileOutputStream out = new FileOutputStream(newFile);        // JPEGImageEncoder可适用于其他图片类型的转换        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);        encoder.encode(tag);        inputStream.close();        out.close();                 System.out.println(newFilePath+" ok, size: "+(fileSize/1024)+"kb to "+(newFile.length()/1024)+"kb");    }         public static void main(String[] args) {        try {            new ThumbnailTools("D:/").setSize(300, 200).generate("1.jpg", "2.jpg");        } catch (Exception e) {            e.printStackTrace();        }    }}