二维码以流的形式输出到界面，并打印不保存到本地
样式：
1 package com.gdzy.ZKZHFWPT.util; 2 3 import java.awt.Color; 4 import java.awt.Font; 5 import java.awt.Graphics2D; 6 import java.awt.image.BufferedImage; 7 import java.io.File; 8 import java.io.IOException; 9 import java.io.OutputStream; 10 import java.util.Hashtable; 11 12 import javax.imageio.ImageIO; 13 14 import com.google.zxing.EncodeHintType; 15 import org.apache.commons.logging.Log; 16 import org.apache.commons.logging.LogFactory; 17 18 import com.google.zxing.BarcodeFormat; 19 import com.google.zxing.MultiFormatWriter; 20 import com.google.zxing.WriterException; 21 import com.google.zxing.common.BitMatrix; 22 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; 23 24 public class QRCodeUtils{ 25 26 private static final Log logger = LogFactory.getLog(QRCodeUtils.class); 27 28 private static final int BLACK = 0xFF000000; 29 private static final int WHITE = 0xFFFFFFFF; 30 private static final int LogoPart = 4; 31 private static int margin = 4; //白边大小,取值范围0~4 32 /** 33 * 生成二维码前的配置信息 34 * @param content 生成二维码图片内容 35 * @param width 二维码图片的宽度 36 * @param height 二维码图片的高度 37 * @return 38 */ 39 public static BitMatrix setBitMatrix(String content,int width,int height){ 40 Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>(); 41 hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 42 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //指定纠错等级 43 hints.put(EncodeHintType.MARGIN, 4); 44 BitMatrix bitMatrix=null; 45 try { 46 bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints); 47 } catch (WriterException e) { 48 logger.error("生成二维码错误",e); 49 } 50 return bitMatrix; 51 } 52 53 /** 54 * 将LOGO图片放在二维码中间（水印效果） 55 * 将生成的图片以流的形式输出到页面展示 56 * @param matrix BitMatrix 57 * @param format 图片格式 58 * @param outStream 输出流 59 * @param logoPath LOGO地址 60 * @param showBottomText 二维码图片底部需要显示的问题 61 * @throws IOException 62 */ 63 public static void megerToFile(BitMatrix matrix,String format,OutputStream outStream,String logoPath,String showBottomText) throws IOException { 64 BufferedImage codeImage = toBufferedImage(matrix); 65 Graphics2D gs = codeImage.createGraphics(); 66 //1.加入LOGO水印效果 67 if(null != logoPath && !"".equals(logoPath)){ 68 //1.1 载入LOGO图片 69 BufferedImage logoImg = ImageIO.read(new File(logoPath)); 70 //1.2 考虑到LOGO图片贴到二维码中，建议大小不要超过二维码的1/5; 71 int width = codeImage.getWidth() / LogoPart; 72 int height = codeImage.getHeight() / LogoPart; 73 //1.3 LOGO居中显示 74 int x = (codeImage.getWidth() - width) / 2; 75 int y = (codeImage.getHeight() - height) / 2; 76 gs.drawImage(logoImg, x, y, logoImg.getWidth(), logoImg.getHeight(), null); 77 logoImg.flush(); 78 } 79 //画底部画布放置二维码及底部文字 80 int backAmageW = matrix.getWidth(); 81 int backAmageH = matrix.getHeight()+50; 82 BufferedImage backAmage = new BufferedImage(backAmageW, backAmageH, BufferedImage.TYPE_3BYTE_BGR); 83 for(int x=0;x<backAmageW;x++){ 84 for(int y=0;y<backAmageH;y++){ 85 backAmage.setRGB(x, y, WHITE); 86 } 87 } 88 Graphics2D backgs = backAmage.createGraphics(); 89 backgs.drawImage(codeImage, 0, 0, codeImage.getWidth(), codeImage.getHeight(), null); 90 gs.dispose(); 91 codeImage.flush(); 92 //2.二维码图片底部插入文字 93 if(null != showBottomText && !"".equals(showBottomText)){ 94 //2.1 设置字体样式 95 Font font = new Font("微软雅黑", Font.PLAIN, 16); 96 backgs.setColor(Color.black); 97 backgs.setFont(font); 98 //2.2 字体显示位置 99 int x = (backAmage.getWidth() - getWatermarkLength(showBottomText, gs))/2-10; 100 int y = backAmage.getHeight()-30; 101 backgs.drawString(showBottomText, x, y); 102 } 103 backgs.dispose(); 104 backAmage.flush(); 105 ImageIO.write(backAmage, format, outStream); 106 } 107 108 /** 109 * 将LOGO图片放在二维码中间（水印效果） 110 * 将生成的图片生成到本地硬盘路径下 111 * @param matrix BitMatrix 112 * @param format 图片格式 113 * @param imagePath 图片存放路径 114 * @param logoPath LOGO地址 115 * @param showBottomText 二维码图片底部需要显示的问题 116 * @throws IOException 117 */ 118 public static void megerToFile2(BitMatrix matrix,String format,String imagePath,String logoPath,String showBottomText) throws IOException { 119 BufferedImage image = toBufferedImage(matrix); 120 Graphics2D gs = image.createGraphics(); 121 122 //1.加入LOGO水印效果 123 if(null != logoPath && !"".equals(logoPath)){ 124 BufferedImage logoImg = ImageIO.read(new File(logoPath)); 125 int width = image.getWidth() / LogoPart; 126 int height = image.getHeight() / LogoPart; 127 int x = (image.getWidth() - width) / 2; 128 int y = (image.getHeight() - height) / 2; 129 gs.drawImage(logoImg, x, y, logoImg.getWidth(), logoImg.getHeight(), null); 130 logoImg.flush(); 131 } 132 133 //2.二维码图片底部插入文字 134 if(null != showBottomText && !"".equals(showBottomText)){ 135 //2.1 设置字体样式 136 Font font = new Font("微软雅黑", Font.PLAIN, 14); 137 gs.setColor(Color.BLACK); 138 gs.setFont(font); 139 //2.2 字体显示位置 140 int x = (image.getWidth() - getWatermarkLength(showBottomText, gs))/2; 141 int y = image.getHeight()-2; 142 gs.drawString(showBottomText, x, y); 143 } 144 gs.dispose(); 145 ImageIO.write(image, format, new File(imagePath)); 146 } 147 148 /** 149 * 获取水印字体的长度 150 * @param fontString 151 * @param gs 152 * @return 153 */ 154 public static int getWatermarkLength(String fontString,Graphics2D gs){ 155 return gs.getFontMetrics(gs.getFont()).charsWidth(fontString.toCharArray(),0,fontString.length()); 156 } 157 158 public static BufferedImage toBufferedImage(BitMatrix matrix){ 159 int width = matrix.getWidth(); 160 int height = matrix.getHeight(); 161 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR); 162 163 for(int x=0;x<width;x++){ 164 for(int y=0;y<height;y++){ 165 image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE); 166 } 167 } 168 return image; 169 } 170 }
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %> <%@ include file="/jsp/common/commonfile.jsp" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <!-- 与本页面直接相关的JavaScript脚本放置区域. --> <title>外部项目二维码显示</title> <script type="application/javascript"> function closeQrCodeodal() { parent.$("#win").dialog('close'); } function printQrCode() { window.location.href = "printQrCode.action"; } </script> </head> <body style="background-color: white"> <div> <div style="width: 300px;height: 330px;margin: 0 auto;"> <img src="printQrCode.action"> </div> <div style="margin-left: 100px;margin-right: 80px;"> <a href="javascript:void(0);" class="btn btn-primary" style="width:100px;height: 25px; margin-left: 40px;" onclick="closeQrCodeodal();">返回</a> <a href="javascript:void(0);" class="btn btn-primary" style="width:100px;height: 25px; float: right; margin-right: 40px;" onclick="printQrCode()">打印</a> </div> <div style="background-color: white;height: 30px;"></div> </div> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %> <%@ include file="/jsp/common/commonfile.jsp" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title>外部项目二维码打印</title> <script type="application/javascript"> function closeQrCodeodal() { parent.$("#win").dialog('close'); } </script> </head> <body onload="this.focus();this.print();closeQrCodeodal()" style="background-color: white"> <div> <div style="width: 330px;height: 330px;margin:0 auto;"> <img src="showQRCode.action?extProjectId=${extProjectId}"> </div> <div style="background-color: white;height: 30px;"></div> </div> </body> </html> <%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %> <%@ include file="/jsp/common/commonfile.jsp" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title>外部项目二维码打印</title> <script type="application/javascript"> function closeQrCodeodal() { parent.$("#win").dialog('close'); } </script> </head> <body onload="this.focus();this.print();closeQrCodeodal()" style="background-color: white"> <div> <div style="width: 330px;height: 330px;margin:0 auto;"> <img src="showQRCode.action?extProjectId=${extProjectId}"> </div> <div style="background-color: white;height: 30px;"></div> </div> </body> </html>
1 public void printQrCode() throws IOException { 2 HttpServletResponse response = ServletActionContext.getResponse(); 3 OutputStream outputStream = null; 4 try { 5 outputStream = response.getOutputStream(); 6 String content = "人生若只如初见，何事秋风悲画扇"; 7 String logoPath = "E:\\1.jpg"; 8 String format = "jpg"; 9 String bottomText = "人生若只如初见，何事秋风悲画扇"; 10 BitMatrix bitMatrix = QRCodeUtils.setBitMatrix(content, 250, 250); 11 QRCodeUtils.megerToFile(bitMatrix, format, outputStream, logoPath, bottomText); 12 } catch (IOException e) { 13 e.printStackTrace(); 14 } finally { 15 if (outputStream != null) { 16 try { 17 outputStream.flush(); 18 outputStream.close(); 19 } catch (IOException e) { 20 e.printStackTrace(); 21 } 22 } 23 } 24 }
打印通过<body>的 onload="this.focus();this.print(); 调取打印机进行打印
