【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。