java 生成2维码

直接上代码

下载jar包地址:   http://pan.baidu.com/s/1eSxq7ke

package com.util;import java.awt.Color;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.File;import javax.imageio.ImageIO;import com.swetake.util.Qrcode;public class CreateTwoBarImage {    public void creatTxm(String param) throws Exception {        Qrcode qrcode = new Qrcode();        qrcode.setQrcodeErrorCorrect('M');        qrcode.setQrcodeEncodeMode('B');        qrcode.setQrcodeVersion(7);        byte[] bstr = param.getBytes("UTF-8");//返回用指定名字命名的字节数组值        BufferedImage bi = new BufferedImage(139, 139,                BufferedImage.TYPE_INT_RGB);//实例化指定参数的BufferedImage        Graphics2D g = bi.createGraphics();//返回一个呈现指定 BufferedImage 的 Graphics2D 对象        g.setBackground(Color.WHITE); // 设置该Graphics2D 对象的背景颜色        g.clearRect(0, 0, 139, 139); //擦除指定的矩形，并且用一个透明的颜色填充它        g.setColor(Color.BLACK); // 条码颜色        if (bstr.length > 0 && bstr.length < 123) {            boolean[][] b = qrcode.calQrcode(bstr); //通过calQrcode函数将byte数组转换成boolean数组 ,然后依据编码后的boolean数组绘图             for (int i = 0; i < b.length; i++) {                for (int j = 0; j < b.length; j++) {                    if (b[j][i]) {                        g.fillRect(j * 3 + 2, i * 3 + 2, 3, 3); //填充指定的矩形                    }                }            }        }        g.dispose(); //处理图形上下文，并释放系统资源        bi.flush();//将生成的BufferedImage序列化到磁盘        String FilePath = "D:/" + param + ".jpg";//生成的二维码要存放的文件路径        File f = new File(FilePath);        ImageIO.write(bi, "jpg", f);//将生成的二维码以图片的形式写入相应的文件    }    public static void main(String args[]) {        try {            new CreateTwoBarImage().creatTxm("lmb");        } catch (Exception e) {            e.printStackTrace();        }    }}

控制层正式代码

package com.item.controller;import java.awt.Color;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.UnsupportedEncodingException;import javax.imageio.ImageIO;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import com.swetake.util.Qrcode;/** *  * @author: Yanmh * @Title: PrintTwoBarController.java  * @Description: 生成2维码 * * @data: 2017  2017年11月27日  上午11:05:38 */@Controller@RequestMapping("printcon")public class PrintTwoBarController {@RequestMapping(value="/img.it")   public void print(HttpServletRequest request,            HttpServletResponse response) throws IOException{        String code = request.getParameter("code");        BufferedImage img = getImg(code);        ImageIO.write(img, "jpg", response.getOutputStream());    }public BufferedImage getImg(String code) throws UnsupportedEncodingException{ Qrcode testQrcode = new Qrcode();        testQrcode.setQrcodeErrorCorrect('M');        testQrcode.setQrcodeEncodeMode('B');        testQrcode.setQrcodeVersion(7);        byte[] d = code.getBytes("UTF-8");        BufferedImage image = new BufferedImage(98, 98,                BufferedImage.TYPE_BYTE_BINARY);        Graphics2D g = image.createGraphics();        g.setBackground(Color.WHITE);        g.clearRect(0, 0, 98, 98);        g.setColor(Color.BLACK);        if (d.length > 0 && d.length < 120) {            boolean[][] s = testQrcode.calQrcode(d);            for (int i = 0; i < s.length; i++) {                for (int j = 0; j < s.length; j++) {                    if (s[j][i]) {                        g.fillRect(j * 2 + 3, i * 2 + 3, 2, 2);                    }                }            }        }        g.dispose();        image.flush();        return image;}}

前台：

<img src="<%=path %>/printcon/img.it?code=http://www.baidu.com" width="100" height="100"/>

效果