base64圖片解碼及壓縮

1、packagepoiimptjava.awt.Imageimptjava.awt.image.BufferedImageimptjava.io.Fileimptjava.io.FileInputStreamimptjava.io.FileNotFoundExceptionimptjava.io.FileOutputStreamimptjava.io.IOExceptionimptjava.io.InputStreamimptjava.i

2、o.OutputStreamimptjava.util.Romimptjavax.imageio.ImageIOimptcom.sun.image.codec.jpeg.JPEGCodecimptcom.sun.image.codec.jpeg.JPEGEncodeParamimptcom.sun.image.codec.jpeg.JPEGImageEncoderimptsun.misc.BASE64Decoderimptsun.mis

3、c.BASE64EncoderpublicclassBase64@paramargs@throwsIOExceptionpublicstaticvoidmain(String[]args)StringimgFile=“E:1.png“待處理的圖片InputStreamin=nullbyte[]data=null讀取圖片字節(jié)數(shù)組tryin=newFileInputStream(imgFile)data=newbyte[in.availab

4、le()]in.read(data)in.close()catch(IOExceptione)e.printStackTrace()對(duì)字節(jié)數(shù)組Base64編碼if(!file.exists())returnnull讀取圖片信息ImagesrcFile=ImageIO.read(file)intnew_w=widthintnew_h=heightif(percentage)為等比縮放計(jì)算輸出的圖片寬度及高度接收固定值等比doublerat

5、e1=((double)srcFile.getWidth(null))(double)width0.1doublerate2=((double)srcFile.getHeight(null))(double)height0.1doublerate=rate1rate2rate1:rate2new_w=(int)(((double)srcFile.getWidth(null))rate)new_h=(int)(((double)srcFi

6、le.getHeight(null))rate)原圖1.1new_w=(int)(((double)srcFile.getWidth(null))1.1)new_h=(int)(((double)srcFile.getHeight(null))1.1)寬高設(shè)定BufferedImagetag=newBufferedImage(new_wnew_hBufferedImage.TYPE_INT_RGB)tag.getGraphics().d

7、rawImage(srcFile00new_wnew_hnull)壓縮后的文件名加前綴Stringpst=oldFile.substring(0oldFile.lastIndexOf()1)StringfilePrex=oldFile.substring(oldFile.indexOf()1oldFile.lastIndexOf(.))newImage=pstsmallIconfilePrexoldFile.substring(oldF

8、ile.lastIndexOf(.))加后綴StringfilePrex=oldFile.substring(0oldFile.lastIndexOf(.))newImage=filePrexsmallIconoldFile.substring(filePrex.length())壓縮之后臨時(shí)存放位置FileOutputStreamout=newFileOutputStream(newImage)JPEGImageEncoderenco