In this order-making system, it is necessary to generate a QR code in Java and print and output it on a JSP page, where a QR code is generated in the action.
The key code is as follows
1 Public voidReweima ()throwsexception{2 //Settings page does not cache3HttpServletResponse response =servletactioncontext.getresponse ();4HttpServletRequest Quest =servletactioncontext.getrequest ();5Domain domain=Domainservice.getip ();6 if(domain!=NULL){7String IP =Domain.getip ();8Response.setheader ("Pragma", "No-cache");9Response.setheader ("Cache-control", "No-cache");TenResponse.setdateheader ("Expires", 0); One ABufferedImage image=NULL; -Servletoutputstream stream =NULL; - //picture format of QR code theString format = "gif"; -String path= Quest.getscheme () + "://" +ip+ ":" + quest.getserverport () + quest.getcontextpath () + "/"; -String content=path+ "orderdetail_getmenumaterial?menuid=" +menuId; - intWidth2 = 200; + intHEIGHT2 = 200; - +Hashtable hints =NewHashtable (); A //the encoding used for the content atHints.put (Encodehinttype.character_set, "Utf-8"); - - Try{ -Bitmatrix Bitmatrix =NewMultiformatwriter (). Encode (Content,barcodeformat.qr_code, width2, height2, hints); - intwidth =bitmatrix.getwidth (); - intHeight =bitmatrix.getheight (); inImage =Newbufferedimage (width, height, bufferedimage.type_int_rgb); - for(intx = 0; x < width; X + +) { to for(inty = 0; Y < height; y++) { +Image.setrgb (x, Y, Bitmatrix.get (x, y)? 0xff000000:0xffffffff);//Two-dimensional code picture for black and white color - } the } * //Imageio.write (image, "gif", Response.getoutputstream ()); $}Catch(Exception e) {Panax Notoginseng //Todo:handle Exception - } the //only use this kind of decoding method to not appear garbled +String s= "Attachment;filename=" +NewString ("No" +menuid+ ". gif"); AResponse.AddHeader ("Content-disposition", s); theOutputStream os=NewBufferedoutputstream (Response.getoutputstream ()); +Response.setcontenttype ("Image/gif"); - Imageio.write (image,format,os); $ Os.flush (); $ os.close (); -}Else{ -String messige= "No domain name added, no QR code to print"; theRequest.put ("Messige", messige); - }Wuyi}
JSP page generation call generation QR code method, return to the print QR code JSP, the code is as follows
1<%@ page language= "java" contenttype= "text/html; Charset=iso-8859-1 "2pageencoding= "Iso-8859-1"%>3<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "HTTP://WWW.W3.ORG/TR/HTML4/LOOSE.DTD" >456<meta http-equiv= "Content-type" content= "text/html; Charset=iso-8859-1 ">7<title>insert title here</title>89<body>Ten<div style= "Text-align:center;" > One A</div> - -<script type= "Text/javascript" > theWindow.onload =function () { - Window.print () - window.close ()//Return to the original interface after printing - } + -</script> +</body> AHere the idea is the action generated by the two-dimensional code into the SRC tag, directly print the entire JSP, in this process, encountered a problem, originally called the Java internal Print method to print two-dimensional codes, but in this process encountered the system can not find the specified path, (QR code generated on the server , the browser invokes the server content) and, finally, uses an easy way to print the entire JSP page directly.
Java generates and prints two-dimensional code
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