裁剪java上传图片，对图片进行等比例缩放，及局部裁剪的工具类代码

Java上传图片对图片进行等比例缩放及局部裁剪的工具类代码import c om.sun.image.c odec.jpeg.JPEGCodec;import c om.sun.image.c odec.jpeg.JPEGEnc odeParam;import c om.sun.image.c odec.jpeg.JPEGImageEnc oder;public class FileUploadUtils {

*裁剪图片

*@param input

*@param basepath

*@param uid

*@param x

*@param y

*@param w idth

*@param height

*@r eturn绝对路径

*@throws IOExc eptionpublic static String cutImg(String input,String basepath,int x,int y,int width,int height) throwsIOException{

S tring path2=bas epath+/+Cons tantUtils.US ERFAC ET EMPPAT H;

String postfix=getPostfix(input);

String dst=path2+/+UUID.randomUUID().toString()+.+postfix;createDir(path2);img Cut(b as ep ath+input,ds t,p o stfix,x,y,w idth,height);return dst;

*裁剪图片

*@param input

*@param src

*@param x

*@param y

*@param w idth

*@param height

*@throws IOExc eptionpublic static void imgCut(String input,String dst,String type,int x,int y,int width,int height)throws IOExc eption

BufferedImage fromimg=ImageIO.read(new File(input));

ImageFilter cropFilter=new CropImageFilter(x,y,width,height);

Image img = Toolkit.getDefaultToolkit().createImage(newFilteredImageSourc e(fromimg.getSourc e(),cropFilter));

BufferedImage tag=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

Graphic s g=tag.getGraphic s();g.draw Imag e(img,0,0,null); //绘制小图g.dis p o s e();

//输出为文件

//dir=d:\\temp\\c ut_image_+i+_+j+.jp g

File f=new File(dst);

I mag eI O.write(tag,typ e, f);public static String uploadImg(File src,String basepath,String filename) throws Exception{

String daypath = DateTools.getYear() + + DateTools.getMonth() + +D ateTo o ls.getMonthWeek();

String temppath = ConstantUtils.BASEUPLOADPATH+ /+Cons tantUt ils.ORI GIN ALIMGPAT H+/+daypath;

String thumbnailpath = ConstantUtils.BASEUPLOADPATH+ /+Cons tantUt ils.T HUM BN AILI MGPAT H+/+dayp ath;

String postfix=getPostfix(filename);

String uuid=UUID.randomUUID().toString();

String dsttempname=uuid+.+postfix;createDir(bas epath+/+temppath);cr eateD ir (b as ep ath+/+thumbnailp ath);

String dstallpath=bas epath+/+temppath+/+dsttempname;

String ds tthumbnailpath=bas epath+/+thumbnailpath+/+ds ttempnam e;copy(src,new File(dstallpath));

//对上传的文件进行等比例裁剪。 按照前段要展现的height w idth

T humb n ail(d s t al lp ath,d s tthumb n ailp ath,350,300,100);

//返回裁剪后的路径r eturn thumbnailp ath+/+ds ttempnam e;

*上传文件

*@param src

*@param dst

*@throws Exc eptionpublic static void copy(File src,File dst) throws Exception{

try{

InputStream in=null;

OutputStream out=null;try{in=new BufferedInputStream(new FileInputStream(src),ConstantUtils.BUFF ER_SIZE);out=new BufferedOutputStream(new FileOutputStream(dst),ConstantUtils.BUFFER_SIZE);byte[]buffer=new byte[ConstantUtils.BUFFER_SIZE];while(in.read(buffer)0) {out.write(buffer);

}final ly{if(nu ll !=in) {in.close();if(nu ll !=o ut) {out.c lo s e();

} catch(Exc eption e) {e.printStackTrac e();throw e;

*得到文件后缀jpg

*@param fileName

*@r eturnpublic static String getPostfix(String fileName){if(fileName.equa ls( ))

r eturnint pos=fileName.lastIndexOf( .if(pos 0) {return fileName.substring(fileName.length() - 3).toLow erCas e();} els e {return fileName.substring(pos+1).toLow erCas e();

*创建目录

*@param filePathpublic static void createDir(String filePath) {

File myFile=new File(filePath);if(!myFile.ex ists()) {if(!myF ile.mkd irs())

Sys tem.out.println(创建目录failels e

System.out.println(创建目录succ es smyF ile=null;

*等比例缩放图片

*@param infile

*@param outfile

*@param w idth

*@param height

*@param quality

*@throws IOExc eption

*@throw s InterruptedExc eptionpublic static void Thumbnail(String infile, String outfile, int width, int height, int quality)throws IOExc eption, InterruptedExc eption{

//save thumbnail imag e to OUTFILE

//System.out.println( infile:+infile);

Buffer edI mag e thumb Imag e=null;

BufferedOutputS tream out=null;

Image image=null;image=Toolkit.getDefaultToo lkit().createImage(infile);

MediaTracker mediaTracker=new MediaTracker(new Container());mediaTrac ker.addImage(image,0);mediaTrac ker.w aitF orID(0);int thumb Width=w idth;int thumbHe ight=height;doub le thumbRatio=(doub le) thumbWidth/ (doub le) thumbHe ight;int image Width=image.get Width(null);int imageHe ight=image.getHe ight(null);double image Rat io=(double) imageWidth/ (double) image Height;if(thumbRatio imageRatio) {thumb He ight=(int) (thumb Width/ im ag eRat io);

} els e {

thumb Width=(int) (thumb He ight * im ag eR atio);thumbImage = new BufferedImage(thumbWidth, thumbHe ight,BufferedImage.TYPE_INT_RGB);

Graphic s2D graphic s2D=thumbImage.createGraphic s();graphic s 2D.s etRenderingHint(Rend ering Hints.KEY_INTERPOLATION,Rendering Hints.VALUE_INTERP O LATION_BILINEAR);graphic s 2 D.draw I mag e(imag e,0,0, thumbWidth, thumbHe ight,null);out=new BufferedOutputStream(new FileOutputStream(outfile));

JPEGImageEnc oder enc oder=JPEGCodec.createJPEGEnc oder(out);

JPEGEnc odeParam param=enc oder.getDefaultJPEGEnc odeParam(thumbImage);quality=Math.max(0,Math.min(qual ity, 100));param.s etQuality((float)quality/ 100.0 f,fals e);enc oder.s etJPEGEnc odeParam(param);enc oder.enc ode(thumbImage);out.c lo s e();thumb I m ag e=null;o ut=nu ll;imag e=null;

}