Java生成二维码并调用打印机打印

本次做订餐系统中，需要用到在Java生成二维码，并在jsp页面打印并输出，其中在action中生成二维码.

关键代码如下

 1 public void reWeiMa() throws Exception{
 2         //设置页面不缓存
 3          HttpServletResponse response = ServletActionContext.getResponse();
 4          HttpServletRequest quest = ServletActionContext.getRequest();
 5         Domain domain=domainService.getIp();
 6         if(domain!=null){
 7             String IP =domain.getIp();
 8             response.setHeader("Pragma","No-cache");
 9             response.setHeader("Cache-Control","no-cache");
10             response.setDateHeader("Expires", 0);
11 
12             BufferedImage image=null;
13             ServletOutputStream stream = null;
14             //二维码的图片格式 
15             String format = "gif";
16              String path= quest.getScheme() + "://"+IP+ ":" + quest.getServerPort()+ quest.getContextPath() + "/"; 
17              String content=path+"OrderDetail_getMenuMaterial?menuId="+menuId;
18                 int width2 = 200; 
19                 int height2 = 200; 
20                 
21                 Hashtable hints = new Hashtable(); 
22                 //内容所使用编码 
23                 hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
24                 
25                 try{
26                     BitMatrix bitMatrix = new MultiFormatWriter().encode(content,BarcodeFormat.QR_CODE, width2, height2, hints);
27                     int width = bitMatrix.getWidth(); 
28                     int height = bitMatrix.getHeight(); 
29                     image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 
30                     for (int x = 0; x < width; x++) { 
31                         for (int y = 0; y < height; y++) { 
32                             image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF); //二维码图片为黑白两色
33                         } 
34                     }
35                     //ImageIO.write(image,"gif",response.getOutputStream());
36                 }catch (Exception e) {
37                     // TODO: handle exception
38                 }
39             //只有用这种解码方式才不出现乱码
40             String s="attachment;filename="+new String("No"+menuId+".gif");
41             response.addHeader("Content-Disposition",s);
42             OutputStream os=new BufferedOutputStream(response.getOutputStream());
43             response.setContentType("image/gif");
44             ImageIO.write(image,format,os);
45             os.flush();
46             os.close();
47         }else{
48             String messige="未添加域名,暂无法打印二维码";
49             request.put("messige", messige);
50             }
51     }

jsp页面代调用生成二维码方法后，返回到打印二维码jsp中，代码如下

 1 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 2     pageEncoding="ISO-8859-1"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <div style="text-align:center;">
11 <img alt="" src="${rootPath}/OrderDetail_reWeiMa?menuId=${menuId}">
12 </div>
13 
14 <script type="text/javascript">
15     window.onload = function(){
16         window.print()
17         window.close()//打印后返回到原界面
18     }
19 
20 </script>
21 </body>
22 </html>

在这里的思路是在action生成的的二维码放入src标签中，直接打印整个jsp，在这个过程中，遇到了一个问题，原本调用Java内部print方法来打印二维码，但在这个过程中遇到系统无法找到指定路径，（二维码生成在服务器上，浏览器调用服务器内容），最后使用简便方法，直接打印整个jsp页面.