Java Generate picture thumbnails

 Packagecom.ares.image.test;ImportJava.awt.Color;ImportJava.awt.Graphics;ImportJava.awt.Image;ImportJava.awt.image.BufferedImage;ImportJava.io.File;Importjava.io.IOException;Importjava.util.Arrays;ImportJavax.imageio.ImageIO;ImportOrg.slf4j.Logger;Importorg.slf4j.LoggerFactory;ImportCom.ares.slf4j.test.Slf4jUtil;/*** <p>title:imageutil </p> * <p>description: </p> * <p>email: [Email protected] </p&  Gt * @authorAres * @date October 28, 2014 morning 10:24:26*/ Public classImageutil {Static{slf4jutil.buildslf4jutil (). LOADSLF4J (); }    PrivateLogger log =Loggerfactory.getlogger (GetClass ()); Private StaticString default_prevfix = "Thumb_"; Private StaticBoolean Default_force =false; /*** <p>Title:thumbnailImage</p> * <p>description: Generate thumbnails based on image path </p> *@paramImagePath Original picture path *@paramw thumbnail width *@paramh Thumbnail Height *@paramPrevfix generate a prefix for thumbnails *@paramwhether force forces a thumbnail to be generated according to the width height (if false, the optimal scale thumbnail is generated)*/     Public voidThumbnailimage (File Imgfile,intWintH, String Prevfix,BooleanForce ) {        if(Imgfile.exists ()) {Try {                //ImageIO supported image types: [BMP, BMP, jpg, jpg, wbmp, JPEG, PNG, PNG, JPEG, wbmp, GIF, GIF]String types =arrays.tostring (Imageio.getreaderformatnames ()); String suffix=NULL; //get picture suffix                if(Imgfile.getname (). IndexOf (".") >-1) {suffix= Imgfile.getname (). substring (Imgfile.getname (). LastIndexOf (".") + 1); }//type and picture suffix all lowercase, and then determine if the suffix is legal                if(Suffix = =NULL|| Types.tolowercase (). IndexOf (Suffix.tolowercase ()) < 0) {Log.error ("Sorry, the image suffix is illegal. The standard image suffix is {}. "+types); return ; } log.debug ("Target image ' size, width:{}, height:{}.", w,h); Image img=Imageio.read (Imgfile); if(!Force ) {                    //find the most appropriate thumbnail scale based on the original image and the required thumbnail scale                    intwidth = img.getwidth (NULL); intHeight = img.getheight (NULL); if(width*1.0)/w < (height*1.0)/h) {                        if(Width >W) {h= Integer.parseint (NewJava.text.DecimalFormat ("0"). Format (Height * w/(width*1.0))); Log.debug ("Change image ' height, width:{}, height:{}.", w,h); }                    } Else {                        if(Height >h) {W= Integer.parseint (NewJava.text.DecimalFormat ("0"). Format (Width * h/(height*1.0))); Log.debug ("Change image ' width, width:{}, height:{}.", w,h); }}} bufferedimage bi=NewBufferedImage (W, H, Bufferedimage.type_int_rgb); Graphics g=Bi.getgraphics (); G.drawimage (IMG,0, 0, W, H, Color.light_gray,NULL);                G.dispose (); String P=Imgfile.getpath (); //Save the picture in the original directory with a prefixImageio.write (bi, suffix,NewFile (P.substring (0,p.lastindexof (file.separator)) + File.separator + Prevfix +imgfile.getname ())); } Catch(IOException e) {log.error ("Generate thumbnail image failed.", E); }        }Else{Log.warn ("The image is not exist."); }    }         Public voidThumbnailimage (String ImagePath,intWintH, String Prevfix,BooleanForce ) {File Imgfile=NewFile (ImagePath);    Thumbnailimage (Imgfile, W, H, Prevfix, Force); }         Public voidThumbnailimage (String ImagePath,intWintHBooleanForce )    {thumbnailimage (ImagePath, W, H, Default_prevfix, Default_force); }         Public voidThumbnailimage (String ImagePath,intWinth)    {thumbnailimage (ImagePath, W, H, Default_force); }         Public Static voidMain (string[] args) {NewImageutil (). Thumbnailimage ("Imgs/tulips.jpg", 100, 150); }}

Effect: (The original picture is the computer "Pictures" folder under the Tulip picture, the size of 1024x768, the resulting picture for 200*150 size, maintain a 4:3 ratio)

Java Generate picture thumbnails