java图片压缩代码二

java图片压缩代码2

import java.awt.Color;import java.awt.Graphics;import java.awt.Image;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import javax.imageio.ImageIO;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGEncodeParam;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class PicCompression {    private int wideth;    private int height;    private String t = null;    public void setT(String t) {        this.t = t;    }    public void setWideth(int wideth) {        // wideth=320;        this.wideth = wideth;    }    public int getWideth() {        return this.wideth;    }    public void setHeight(int height) {        // height=240;        this.height = height;    }    /**    * 压缩图片方法    *     * @param oldFile    *            将要压缩的图片    * @param width    *            压缩宽    * @param height    *            压缩长    * @param quality    *            压缩清晰度 <b>建议为1.0</b>    * @param smallIcon    *            压缩图片后,添加的扩展名    * @return    */    public String imageZipProce(String oldFile, int width, int height, float quality) {        if (oldFile == null) {            return null;        }        String newImage = null;        try {            File file = new File(oldFile);            //文件不存在时            if(!file.exists())return null;            /** 对服务器上的临时文件进行处理 */            Image srcFile = ImageIO.read(file);            int new_w=0,new_h=0;            //获取图片的实际大小 高度            int h=(int)srcFile.getHeight(null);            //获取图片的实际大小 宽度            int w=(int)srcFile.getWidth(null);            // 为等比缩放计算输出的图片宽度及高度            if((((double)w) >(double)width)||(((double)h)>(double) height))            {            double rate=0;//算出图片比例值            //宽度大于等于高度            if(w>=h){              rate = ((double) w) / (double) width;            }            //宽度小于高度            else if(h>w) {            rate = ((double) h) / (double) height;}            //构造新的比例的图片高度与宽度值            new_w = (int) (((double) w) / rate);            new_h = (int) (((double) h) / rate);            /** 宽,高设定 */            BufferedImage tag = new BufferedImage(new_w, new_h,BufferedImage.TYPE_INT_RGB);            tag.getGraphics().drawImage(srcFile, 0, 0, new_w, new_h, null);            String filePrex = oldFile.substring(0, oldFile.indexOf('.'));            /** 压缩后的文件名 */            newImage = filePrex + oldFile.substring(filePrex.length());            /** 压缩之后临时存放位置 */            FileOutputStream out = new FileOutputStream(newImage);            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);            JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);            /** 压缩质量 */            jep.setQuality(quality, true);            encoder.encode(tag, jep);            out.close();            srcFile.flush();            }        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return newImage;    }    public static void main(String str[]) {        PicCompression ps = new PicCompression();        try {            System.out.println(ps.imageZipProce("D:/15.jpg",1600, 1600, 1));            System.out.print("压缩图片成功");        } catch (Exception e) {            e.printStackTrace();        }    }}