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protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException

{

response.setContentType("image/jpeg");

createImage(response.getOutputStream());

} private void createImage(OutputStream out) {

String text =" 测试";

int width = 600;

int height = text.length()/20*20;

BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics2D g = bi.createGraphics();

// set background:

g.setBackground(Color.GREEN);

g.clearRect(0, 0, width, height);

Font mFont = new Font("宋体",Font.PLAIN,20);//默认字体

g.setColor(new Color(Integer.parseInt("000000",16)));

g.setFont(mFont);

int x=3;

int y=3;

int count = text.length();

int i = 0;

String getone = null; while(count >0)

{

getone = text.substring(i,i+1);

if(i % 27 == 0)

{

y = y + 20;

x = 10;

}

//g.drawString(Integer.toString(i),x,y);

g.drawString(getone,x,y);

x = x + 20;

i++ ;

count--;

}

// end draw:

g.dispose();

bi.flush();

// encode:

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);

param.setQuality(1.0f, false);

encoder.setJPEGEncodeParam(param);

try {

encoder.encode(bi);

}

catch(IOException ioe) {

ioe.printStackTrace();

}

}