Import java.awt.color;
Import java.awt.graphics;
Import java.awt.image;
Import java.awt.image.buffered image;
Import java.io.fileinputstream;
import Java . io . filenotfoundexception；
Import java.io.ioexception;
Import javax.imageio.imageio;
Import javax.servlet ... sun.image.codec.jpeg.imageformatexception;
Import com.sun.image.codec.jpeg.jpegcodec;
Import com.sun.image.codec.jpegimageencoder;
/**
* Add image watermarking service category
* */
Public class watermark {
/**
* @param sizeContext adds watermark text.
* @param request request stream object
* @param request response stream object
* */
@SuppressWarnings("deprecation ")
Public static void createmarksize (String Size Context, HttpServletRequest, HttpServletResponse) (
Try {
string path = request . getrealpath(request . getservletpath())；
file inputstream in = new file inputstream(path)；
image src = imageio . read(in)；
int w = src . getwidth(null)；
int h = src . getheight(null)；
BufferedImage img = new BufferedImage(w, h, BufferedImage. TYPE _ INT _ RGB)； //Build the Sketchpad
graphics g = img . get graphics()； //Take a brush
g.drawImage(src，0，0，w，h，null)； //Write the source picture to the sketchpad.
g . set color(color . red)；
g.drawString(sizeContext， 10，5)； //Add text
g . dispose()； //Generate pictures
JPEGImageEncoder e = JPEG codec . createjpegencoder(response . get output stream())；
e . encode(img)；
response.getOutputStream()。 close()；
} catch(file not found exception e){
// TODO automatically generated catch block
e . printstacktrace()；
} catch (ImageFormatException e) {
// TODO automatically generated catch block
e . printstacktrace()；
} catch (IOException e) {
// TODO automatically generated catch block
e . printstacktrace()；
}
}
/**
* @param localPath Add watermark LOGO path.
* @param request request stream object
* @param request response stream object
**/
@SuppressWarnings("deprecation ")
Public static void createMarkLogo (string localPath, HttpServletRequest, HttpServletResponse) {
Try {
file inputstream file = new file inputstream(local path)；
image fimg = imageio . read(file)；
int fw = fimg . getwidth(null)；
int FH = fimg . get height(null)；
string path = request . getrealpath(request . getservletpath())；
file inputstream in = new file inputstream(path)；
image src = imageio . read(in)；
int w = src . getwidth(null)；
int h = src . getheight(null)；
BufferedImage img = new BufferedImage(w, h, BufferedImage. TYPE _ INT _ RGB)； //Build the Sketchpad
graphics g = img . get graphics()； //Take a brush
g.drawImage(src，0，0，w，h，null)； //Write the original image to the drawing board.
g.drawImage(fimg，w-20，h- 15，fw，fh，null)； //Write the watermark image into the drawing board.
g . dispose()； //Generate pictures
JPEGImageEncoder e = JPEG codec . createjpegencoder(response . get output stream())；
e . encode(img)；
response.getOutputStream()。 close()；
} catch(file not found exception e){
// TODO automatically generated catch block
e . printstacktrace()；
} catch (ImageFormatException e) {
// TODO automatically generated catch block
e . printstacktrace()；
} catch (IOException e) {
// TODO automatically generated catch block
e . printstacktrace()；
}
}
}
/**
* @param localPath Add watermark image path
* @param request request stream object
* @param request response stream object
* @param width The width of the watermark image
* @param height The length of the watermark picture.
**/
@SuppressWarnings("deprecation ")
public static void createMarkLogo(String local path，HttpServletRequest request，HttpServletResponse response，int width，int height) {
Try {
file inputstream file = new file inputstream(local path)；
image fimg = imageio . read(file)；
int fw = fimg . getwidth(null)；
int FH = fimg . get height(null)；
string path = request . getrealpath(request . getservletpath())；
file inputstream in = new file inputstream(path)；
image src = imageio . read(in)；
int w = src . getwidth(null)； //w filters the screen width for you.
int h = src . getheight(null)； //h Filter the length of the picture for you.
BufferedImage img = new BufferedImage(w+ width, h+ height, buffered image. TYPE _ INT _ RGB)； //Build the artboard (the width of the artboard is the sum of two pictures)
graphics g = img . get graphics()； //Take a brush
g.drawImage(src，0，0，w，h，null)； //Write the original image to the drawing board.
g.drawImage(fimg，width，height，fw，fh，null)； //Write the watermark image into the drawing board.
g . dispose()； //Generate pictures
JPEGImageEncoder e = JPEG codec . createjpegencoder(response . get output stream())；
e . encode(img)；
response.getOutputStream()。 close()；
} catch(file not found exception e){
// TODO automatically generated catch block
e . printstacktrace()；
} catch (ImageFormatException e) {
// TODO automatically generated catch block
e . printstacktrace()；
} catch (IOException e) {
// TODO automatically generated catch block
e . printstacktrace()；
}
}
}
Pay attention to the annotation of the third method, g.drawimage (fimg, width, height, fw, FH, null); According to the parameters, you are adjusting the hue (below the original).
Filter call
Package com.jc.ts.filter;
Import java.io.ioexception;
Import javax.servlet.filter;
Import javax.servlet.filterchain;
Import javax.servlet.filterconfig;
Import javax.servlet.servletexception;
Import javax.servlet.servletrequest;
Import javax.servlet.servletresponse;
Import javax.servlet ... jc.ts.services.watermark;
The public class WaterFilter implements the filter {
public void destroy() {
// TODO automatically generated method stub
}
public void do filter(servlet request arg 0，ServletResponse arg 1，
FilterChain arg2) raises IOException, ServletException {
http servlet request request =(http servlet request)arg 0；
HttpServletResponse = (httpservlet response) arg1;
//WaterMark.createMarkSize ("Nanjing ts", request, response);
//watermark.createmarklogo ("d: \ \ workspace \ \ mybook \ \ webroot \ \ images \ \ logo \ \ book.jpg", request, response);
watermark . create mark logo(" D:\ \ workspace \ \ mybook \ \ WebRoot \ \ images \ \ logo \ \ book . jpg "，request，response，20，30)；
//Note that the path is absolute, and the three effects cannot be executed at the same time.
}
Public void init(FilterConfig arg0) throws ServletException {
// TODO automatically generated method stub
}
}
Web.xml configuration (written on servlet)
& lt filter & gt
& lt/description & gt； this is the description of my J2EE component & lt/description >
& lt/display-name & gt； this is the display name of my J2EE component & lt/display-name >
& lt/filter-name & gt； water filter & lt/filter-name >
& ltfilter-class & gt； com . JC . ts . filter . water filter & lt； /filter-class & gt；
& lt/filter & gt；