图片放缩

最近由于硬盘太小，数码照片太多，占了太多空间，写一个批量放缩照片的类！

package com.my.test.image;import java.applet.Applet;import java.awt.Color;import java.awt.Graphics;import java.awt.Image;import java.awt.MediaTracker;import java.awt.Toolkit;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.ArrayList;import java.util.List;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class ImageTool {private Boolean proportion=true;private List fileInList=new ArrayList();private List fileOutList=new ArrayList();public Boolean photojob(String inputdir,String outputdir,double bl){if(!check(inputdir,outputdir,bl)){return false;}for(int i=0;i<fileInList.size();i++){start((String)fileInList.get(i),(String)fileOutList.get(i),bl);}return true;}public Boolean start(String in,String out,double bl){ //建立输出文件对象 File file = new File(out); FileOutputStream tempout = null; try { tempout = new FileOutputStream(file); } catch (Exception ex) { System.out.println(ex.toString()); } Image img = null; //用于操作windows的一些组件 Toolkit tk = Toolkit.getDefaultToolkit(); Applet app = new Applet(); MediaTracker mt = new MediaTracker(app); try { img = tk.getImage(in); mt.addImage(img, 0); mt.waitForID(0); } catch (Exception e) { e.printStackTrace(); } if (img.getWidth(null) == -1) { return false; } else { int new_w; int new_h; if (this.proportion == true) { //判断是否是等比缩放. //为等比缩放计算输出的图片宽度及高度 new_w = (int) (((double) img.getWidth(null))*bl); new_h = (int) (((double) img.getHeight(null)) *bl); } else { new_w = 100; //输出的图片宽度 new_h = 100; //输出的图片高度 } BufferedImage buffImg = new BufferedImage(new_w, new_h, BufferedImage.TYPE_INT_RGB); Graphics g = buffImg.createGraphics(); g.setColor(Color.white); g.fillRect(0, 0, new_w, new_h); g.drawImage(img, 0, 0, new_w, new_h, null); g.dispose(); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(tempout); try { encoder.encode(buffImg); tempout.close(); } catch (IOException ex) { System.out.println(ex.toString()); } }return true;}public Boolean check(String inputdir,String outputdir,double bl){//判断放缩比例if(!checkbl(bl)){return false;}//判断目录if(!checkFile( inputdir, outputdir)){return false;}return true;}//判断目录是否存在,过滤文件名public Boolean checkFile(String inputdir,String outputdir){File file=null;File file1=null;try {file = new File(inputdir);} catch (NullPointerException e) {return false;}try {file1 = new File(outputdir);} catch (NullPointerException e) {return false;}if(file.exists()){if(file.isFile()){fileInList.add(file.getParent()+"/"+file.getName());if(file1.isDirectory()){fileOutList.add(outputdir+"/"+file.getName().split("//.")[0]+"_out."+file.getName().split("//.")[1]);}else if(file1.isFile()){fileOutList.add(file1.getParent()+"/"+file.getName().split("//.")[0]+"_out."+file.getName().split("//.")[1]);}}else if(file.isDirectory()){for(int i=0;i<file.list().length;i++){if(checkname(file.list()[i])){fileInList.add(file.getPath()+"/"+file.list()[i]);if(file1.isDirectory()){fileOutList.add(outputdir+"/"+file.list()[i].split("//.")[0]+"_out."+file.list()[i].split("//.")[1]);}else if(file1.isFile()){fileOutList.add(file1.getParent()+"/"+file.list()[i].split("//.")[0]+"_out."+file.list()[i].split("//.")[1]);}}}}}else{return false;}return true;}//判断放缩比例public Boolean checkbl(double bl){if(bl<0){System.out.println("放缩比例必须大于零！");return false;}return true;}//过滤扩展名public Boolean checkname(String name){if(name.split("//.")[1].equals("jpg")){return true;}else if(name.split("//.")[1].equals("bmp")){return true;}return false;}public static void main(String[] args) {ImageTool it=new ImageTool();String in="C://Documents and Settings//All Users//Documents//My Pictures//示例图片";String out="D://temp";it.photojob(in,out, 0.2);System.out.println("原文件：/n"+in);System.out.println("目标文件：/n"+out);System.out.println("放缩完毕！");}}