【JAVA】纯JSP文件二维码生成代码分享

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ page import="java.io.FileInputStream" %>
<%@ page import="java.io.ByteArrayOutputStream" %>
<%@ page import="java.io.IOException" %>
<%@ page import="java.io.InputStream" %>
<%@ page import="java.awt.image.BufferedImage" %>
<%@ page import="javax.imageio.ImageIO" %>
<%@ page import="java.io.File" %>
<%@ page import="java.util.Hashtable" %>

<%@ page import="com.google.zxing.BarcodeFormat" %>
<%@ page import="com.google.zxing.EncodeHintType" %>
<%@ page import="com.google.zxing.MultiFormatWriter" %>
<%@ page import="com.google.zxing.WriterException" %>
<%@ page import="com.google.zxing.common.BitMatrix" %>
<%
int BLACK = 0xFF000000;  

int WHITE = 0xFFFFFFFF;  
String text = "http://www.haiqiancun.com/application/index.jsp"; 
String exts = "/file/zxing"; 
File f = new File(getServletContext().getRealPath("/")+exts);
        int width = 300;  
        int height = 300;  
        //二维码的图片格式  
        String format = "gif";  
        Hashtable hints = new Hashtable();  
        //内容所使用编码  
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  
        BitMatrix bitMatrix = new MultiFormatWriter().encode(text,BarcodeFormat.QR_CODE, width, height, hints);  
        //生成二维码  
        File outputFile = new File(f+"/core.gif");  

        if(!f.exists()){

f.mkdir();

}

     BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
     for (int x = 0; x < width; x++) {  
       for (int y = 0; y < height; y++) {  
         image.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);  
       }  
     }  
     BufferedImage bimage =  image;
     if (!ImageIO.write(image, format, outputFile)) {  
       throw new IOException("Could not write an image of format " + format + " to " + outputFile);  
     } 
     out.println("<div style='text-align:center;'><img src='"+request.getContextPath()+exts+"/core.gif' /><br/>"+text+"<br/>文件生成成功："+f+"</div>");
%>

重点在于要引用谷歌开发的zxing包。