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response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
DrawLine dl=new DrawLine();BufferedImage image =dl.drawReflexLine(20, 10, 0);
ImageIO.write(image, "JPEG", response.getOutputStream());
DrawLine dl = new DrawLine();
BufferedImage image = dl.drawReflexLine(40, 50, 0);
jLabel1 = new JLabel(new ImageIcon(image));
jScrollPane2.getViewport().add(jLabel1);
out.clearBuffer();// 增加这一句,删除以前的所有输出
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
DrawLine dl=new DrawLine();BufferedImage image =dl.drawReflexLine(20, 10, 0);
ImageIO.write(image, "JPEG", response.getOutputStream());