Java image compression implementation ideas and code

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Java Picture Compression Code

Copy Code code as follows:

package com.img;


import Java.awt.Image;


import Java.awt.image.BufferedImage;


import Java.io.File;


import Java.io.FileOutputStream;


import java.io.IOException;


import Javax.imageio.ImageIO;


import Com.sun.image.codec.jpeg.JPEGCodec;


import Com.sun.image.codec.jpeg.JPEGImageEncoder;


/**


*


* @author Cola plus sugar


*/


public class Compresspicdemo {


private file = null; File Object


private String InputDir; Input graph Path


private String OutputDir; Output graph Path


private String InputFileName; Input diagram filename


private String OutputFileName; Output diagram filename


private int outputwidth = 100; Default output picture wide


private int outputheight = 100; Default output Picture High


Private Boolean proportion = true; is equal to the scaling mark (implied equal ratio scaling)


public Compresspicdemo () {//initialization variable


InputDir = "";


OutputDir = "";


inputfilename = "";


outputfilename = "";


outputwidth = 100;


outputheight = 100;


}


public void Setinputdir (String inputdir) {


this.inputdir = InputDir;


}


public void Setoutputdir (String outputdir) {


this.outputdir = OutputDir;


}


public void Setinputfilename (String inputfilename) {


this.inputfilename = inputfilename;


}


public void Setoutputfilename (String outputfilename) {


this.outputfilename = OutputFileName;


}


public void setoutputwidth (int outputwidth) {


this.outputwidth = outputwidth;


}


public void setoutputheight (int outputheight) {


this.outputheight = outputheight;


}


public void setwidthandheight (int width, int height) {


this.outputwidth = width;


this.outputheight = height;


}


/*


* Get picture size


* Incoming parameter String path: Picture path


*/


Public long Getpicsize (String path) {


file = new file (path);


return File.length ();


}


//Picture processing


public String Compresspic () {


try {


//Get source file


file = new file (InputDir + inputfilename);


if (!file.exists ()) {


return "";


}


Image img = imageio.read (file);


//Determine if the picture format is correct


if (img.getwidth (null) = = 1) {


System.out.println ("Can ' t read,retry!" + "<BR>");


return "no";


} else {


int newwidth; int newheight;


//Determine if scaling is equal


if (this.proportion = = True) {


//is the picture width and height of the output for equal ratio scaling


Double rate1 = ((double) img.getwidth (NULL))/(double) outputwidth + 0.1;


Double rate2 = ((double) img.getheight (NULL))/(double) outputheight + 0.1;


//Zoom control based on large scaling ratio


double rate = rate1 > rate2? Rate1:rate2;


newwidth = (int) ((double) img.getwidth (NULL))/rate);


newheight = (int) ((double) img.getheight (NULL))/rate);


} else {


newwidth = img.getwidth (null); Picture width of output


newheight = img.getheight (null); The output of the picture height


}


bufferedimage tag = new BufferedImage (int) newwidth, (int) newheight, BUFFEREDIMAGE.TYPE_INT_RGB);


/*


* Image.scale_smooth's thumbnail algorithm generates the smoothness of the thumbnail image


* Higher priority than the speed of the resulting picture quality is relatively good but slow


*/


tag.getgraphics (). DrawImage (Img.getscaledinstance (Newwidth, Newheight, Image.scale_smooth), 0, 0, NULL);


FileOutputStream out = new FileOutputStream (OutputDir + outputfilename);


//JPEGImageEncoder can be used for conversions of other picture types


JPEGImageEncoder encoder = Jpegcodec.createjpegencoder (out);


Encoder.encode (tag);


Out.close ();


}


} catch (IOException ex) {


Ex.printstacktrace ();


}


return "OK";


}


public string Compresspic (string InputDir, String OutputDir, String inputfilename, String outputfilename) {


//Input graph path


This.inputdir = InputDir;


//Output graph path


this.outputdir = OutputDir;


//input map filename


this.inputfilename = inputfilename;


//output graph filename


this.outputfilename = OutputFileName;


return Compresspic ();


}


public string Compresspic (string InputDir, String OutputDir, String inputfilename, string outputfilename, int width, int height, Boolean gp) {


//Input graph path


this.inputdir = InputDir;


//Output graph path


this.outputdir = OutputDir;


//input map filename


this.inputfilename = inputfilename;


//output graph filename


this.outputfilename = OutputFileName;


//Set Picture long width


setwidthandheight (width, height);


//is the equal-ratio scaling Mark


this.proportion = GP;


return Compresspic ();


}


Main Test


//compresspic (large picture path, generate small picture path, large picture filename, generate small picture Wennan, generate small picture width, generate small picture height, whether equal scaling (default is True))


public static void Main (string[] arg) {


Compresspicdemo mypic = new Compresspicdemo ();


System.out.println ("Input picture size:" + mypic.getpicsize ("e:1.jpg")/1024 + "KB");


mypic.compresspic ("E:", "E:test", "1.jpg", "r1.jpg", A., A, false);


}


}