import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class ImageServlet extends HttpServlet {
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 设置响应类型
response.setContentType("image/jpeg");
// 图片的内存映像
BufferedImage image = new BufferedImage(50, 20,BufferedImage.TYPE_INT_RGB);
// 获得画笔对象
Random r = new Random();
Graphics g = image.getGraphics();
g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
g.fillRect(0, 0, 50, 20);
g.setColor(new Color(0,0,0));
String number = String.valueOf(r.nextInt(99999));
g.drawString(number, 5, 15);
// 压缩成jpeg格式
OutputStream os = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
// 把BufferedImage对象中的图像信息编码后
// 向创建该对象(encoder)时指定的输出流输出
encoder.encode(image);
}
}
posted on 2010-11-21 12:46
zeroline 阅读(571)
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Servlet/JSP