Java generate image thumbnail image

/** * */ Packagecom.fkhwl.fkhserver.core.utils;ImportJava.awt.Image;ImportJava.awt.image.BufferedImage;ImportJava.io.File;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;ImportJava.io.InputStream;ImportJavax.imageio.ImageIO;ImportCom.sun.image.codec.jpeg.JPEGCodec;ImportCom.sun.image.codec.jpeg.JPEGImageEncoder;/*** @ClassName: Thumbnailtools * @Description: Thumbnail generation tool *@author* @date September 25, 2014 PM 5:18:33*/ Public classThumbnailtools {Private intfileSize; PrivateString Inpath;//Input Diagram Path    PrivateString Outpath;//Output Diagram Path    Private intwidth = 100;//Default output image width    Private intheight = 100;//default output Picture High    PrivateString Infilename;//input Diagram file name    PrivateString Outfilename;//output diagram file name    Private Booleanproportion =true;//is equal to the scaling mark (default ratio scaling)    PrivateString prefix = "Thumbnail_";  Public intgetwidth () {returnwidth; }      Public voidSetWidth (intwidth) {         This. width =width; }      Public intgetheight () {returnheight; }      Public voidSetHeight (intheight) {         This. Height =height; }          PublicThumbnailtools SetSize (intsize) {         This. width =size;  This. Height =size; return  This; }          PublicThumbnailtools SetSize (intWidthintheight) {         This. width =width;  This. Height =height; return  This; }          PublicString Getinpath () {returnInpath; }      Public voidSetinpath (String inpath) { This. Inpath =Inpath; }      PublicString Getoutpath () {returnOutpath; }      Public voidSetoutpath (String outpath) { This. Outpath =Outpath; }      Public Booleanisproportion () {returnproportion; }      Public voidSetproportion (Booleanproportion) {         This. proportion =proportion; }          Publicthumbnailtools (String path) { This. Inpath =path;  This. Outpath =path; }      Publicthumbnailtools (String inpath, String outpath) { This. Inpath =Inpath;  This. Outpath =Outpath; }         /*** Generate thumbnail image *@paramFileName *@returnBoolean*/     Public BooleanGenerate (String fileName)throwsexception{ This. Generate (FileName,NULL); returnboolean.true; }     /*** Generate thumbnail image *@paramFileName *@paramoutfilename Output File name *@returnBoolean*/     Public BooleanGenerate (String fileName, String outfilename)throwsexception{File File=NewFile (inpath+fileName);  This. Infilename =FileName;  This. Outfilename =NULL= = Outfilename? prefix+Infilename:outfilename;  This. Execute (Newfileinputstream (file)); returnboolean.true; }          Public BooleanGenerate (InputStream InputStream, String Outpath)throwsexception{ This. Execute (inputstream); returnboolean.true; }         Private voidExecute (InputStream inputstream)throwsException { 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; }                 intNewwidth; intNewheight; //whether it is equal to scale        if( This. proportion = =true) {            //image width and height for equal to scale calculation            DoubleRate1 = ((Double) Oldimage.getwidth ())/(Double) width; DoubleRate2 = ((Double) Oldimage.getheight ())/(Double) height; //scale control based on large scale ratios            DoubleRate = rate1 > rate2?Rate1:rate2; Newwidth= (int) (((Double) Oldimage.getwidth ())/Rate ); Newheight= (int) (((Double) Oldimage.getheight ())/Rate ); } Else{newwidth= width;//picture width of outputNewheight = height;//picture height of output} bufferedimage Tag=NewBufferedImage ((int) Newwidth, (int) Newheight, BUFFEREDIMAGE.TYPE_INT_RGB); //Image.scale_smooth's thumbnail algorithm produces thumbnail images with higher priority than high-speed image quality but slowerTag.getgraphics (). DrawImage (Oldimage.getscaledinstance (Newwidth, Newheight, Image.scale_smooth), 0, 0,NULL); String Newfilepath= outpath+Outfilename; File NewFile=NewFile (Newfilepath); FileOutputStream out=NewFileOutputStream (NewFile); //JPEGImageEncoder can be used for conversion of other picture typesJPEGImageEncoder 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 voidMain (string[] args) {Try {            NewThumbnailtools ("d:/"). SetSize. Generate ("1.jpg", "2.jpg"); } Catch(Exception e) {e.printstacktrace (); }    }}

You may get an error when running, because the program requires Java two JAR package support

working with images in eclipse requires the introduction of two packages:
import Com.sun.image.codec.jpeg.JPEGCodec;
import Com.sun.image.codec.jpeg.JPEGImageEncoder;
Error:
Access restriction:the type JPEGImageEncoder is not accessible due to restriction on required library C:\Java\jre1.6. 0_07\lib\rt.jar

eclipse By default sets these access-restricted APIs to error. Just put windows-preferences-java-complicer-errors/warnings inside the deprecated and restricted API in forbidden references (access Rules) can be compiled by selecting the warning.

Java generate picture thumbnails