http://blog.163.com/hjy301@126/blog/static/277123932010517103059983/
http://cache.baiducontent.com/c?m=9d78d513d99b12eb0bfa940f1a67a1716925971238c0a36468d5e35fe2144c35407193be30531710948522685be90f1efdf1456f2a5d7bf0de9fd349d6b1913f2fff7c722757d15612a448f2945b759f7dc547eaab19e2b1f5&p=8b2a971e86cc41ac53f3d5684a4380&newp=882a9546dd921fb918adc62d0214a5231610db2151d4d01e2e8a8508d336&user=baidu&fm=sc&query=java+%CD%BC%C6%AC%CB%F5%B7%C5&qid=&p1=4
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package com.thumbail;
import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/*
* Thumbnail class
*/
public class SmallPic {
private String inputDir; // input map path
private String outputDir; // output graph path
private String inputFileName; // input image file name
private String outFileName; // output image file name
private int outputHeight = 180; // Default output image width
private int outputWidth = 180; // Default output image width
private int rate = 0;
private boolean proportion = false; // whether to scale the marker (default is proportional scale)
public SmallPic() {
// Initialize variables
inputDir = "";
outputDir = "";
inputFileName = "";
outFileName = "";
outputHeight = 80;
outputWidth = 80;
rate = 0;
}
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.outFileName = OutputFileName;
}
public void setOutputWidth(int OutputWidth) {
this.outputWidth = OutputWidth;
}
public void setOutputHeight(int OutputHeight) {
this.outputHeight = OutputHeight;
}
public void setW_H(int width, int height) {
this.outputWidth = width;
this.outputHeight = height;
}
public String s_pic() {
BufferedImage image;
String NewFileName;
// Create output file object
File file = new File(outputDir + outFileName);
FileOutputStream tempout = null;
try {
tempout = new FileOutputStream(file);
} catch (Exception ex) {
System.out.println(ex.toString());
}
Image img = null;
Toolkit tk = Toolkit.getDefaultToolkit();
Applet app = new Applet();
MediaTracker mt = new MediaTracker(app);
try {
img = tk.getImage(inputDir + inputFileName);
mt.addImage (img, 0);
mt.waitForID(0);
} catch (Exception e) {
e.printStackTrace ();
}
if (img.getWidth(null) == -1) {
System.out.println(" can't read,retry!" + "<BR>");
return "no";
} else {
int new_w;
int new_h;
if (this.proportion == true) // Determine whether it is proportional scaling.
{
// Calculate the output image width and height for proportional scaling
double rate1 = ((double) img.getWidth(null))
/ (double) outputWidth + 0.1;
double rate2 = ((double) img.getHeight(null))
/ (double) outputHeight + 0.1;
double rate = rate1 > rate2 ? rate1 : rate2;
new_w = (int) (((double) img.getWidth(null)) / rate);
new_h = (int) (((double) img.getHeight(null)) / rate);
} else {
new_w = outputWidth; // output image width
new_h = outputWidth; // output image height
}
BufferedImage buffImg = new BufferedImage(new_w, new_h,
BufferedImage.TYPE_INT_RGB);
Graphics g = buffImg.createGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, new_w, new_h);
g.drawImage(img, 0, 0, new_w, new_h, null);
g.dispose();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(tempout);
try {
encoder.encode(buffImg);
tempout.close();
} catch (IOException ex) {
System.out.println(ex.toString());
}
}
return "ok";
}
public String s_pic(String InputDir, String OutputDir,
String InputFileName, String OutputFileName) {
// input map path
this.inputDir = InputDir;
// output map path
this.outputDir = OutputDir;
// input image file name
this.inputFileName = InputFileName;
// output image file name
this.outFileName = OutputFileName;
return s_pic();
}
public String s_pic(String InputDir, String OutputDir,
String InputFileName, String OutputFileName, int width, int height,
boolean gp) {
// input map path
this.inputDir = InputDir;
// output map path
this.outputDir = OutputDir;
// input image file name
this.inputFileName = InputFileName;
// output image file name
this.outFileName = OutputFileName;
// set image length and width
setW_H(width, height);
// Whether it is a proportional zoom marker
this.proportion = gp;
return s_pic();
}
public static void main(String[] a) {
// s_pic (large image path, generate small image path, large image file name, generate small image text name, generate small image width, generate small image height)
SmallPic mypic = new SmallPic();
System.out.println(mypic.s_pic(
"D:\\img\\",
"D:\\img\\", "noavatar_middle.gif",
"top2_small.jpg", 150,119, false));
}
}