生成图片并发布的Servlet

最新推荐文章于 2024-09-25 11:22:58 发布

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本文介绍了一个使用Java Servlet创建并输出JPEG格式图片的方法。通过设置图片背景颜色为蓝色，并使用红色线条绘制从左上角到右下角的对角线，最终将绘制好的图片输出为JPEG格式。

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import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.OutputStream; 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.ImageFormatException; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGEncodeParam; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class CreateImageServlet extends HttpServlet { public CreateImageServlet() { super(); } public void destroy() { super.destroy(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("image/jpeg"); CreateImage(response.getOutputStream()); } private void CreateImage(OutputStream out) { int width = 100; int height = 100; BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = bi.createGraphics(); // set background g.setBackground(Color.BLUE); g.clearRect(0, 0, width, height); // set fore color g.setColor(Color.RED); // strat draw g.drawLine(0, 0, 99, 199); // 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 (ImageFormatException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } public void init() throws ServletException { } }