生活中隨處可見的二維碼大家都不陌生侍瑟，java中常用的是矩陣式二維碼QRCode蝎毡，生成QRCode有很多現(xiàn)成的工具，這里簡單記一下抛寝。

1.QRCode熊杨，這個是日本人寫的，下載QRCode.jar就可以用了

package com.util;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

public class QrCodeUtil {
    /**
     * 生成二維碼圖片
     * @param content 二維碼內(nèi)容
     * @param imgPath 二維碼圖片的保存路徑
     */
    public static void getQrcodeImg(String content,String imgPath){
        int width=140;
        int height=140;
        //實(shí)例化Qrcode
        Qrcode qrcode=new Qrcode();
        //設(shè)置二維碼的排錯率L(7%) M(15%) Q(25%) H(35%)
        qrcode.setQrcodeErrorCorrect('M');
        qrcode.setQrcodeEncodeMode('B');        
        //設(shè)置二維碼尺寸(1~49)
        qrcode.setQrcodeVersion(7);
        //設(shè)置圖片尺寸
        BufferedImage bufImg=new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
        
        //繪制二維碼圖片
        Graphics2D gs=bufImg.createGraphics();
        //設(shè)置二維碼背景顏色
        gs.setBackground(Color.WHITE);
        //創(chuàng)建一個矩形區(qū)域
        gs.clearRect(0, 0, width, height);
        //設(shè)置二維碼的圖片顏色值 黑色
        gs.setColor(Color.BLACK);
        
        //獲取內(nèi)容的字節(jié)數(shù)組,設(shè)置編碼集
        try {
            byte[] contentBytes=content.getBytes("utf-8");
            int pixoff=2;
            //輸出二維碼
            if(contentBytes.length>0&&contentBytes.length<120){
                boolean[][] codeOut=qrcode.calQrcode(contentBytes);
                for(int i=0;i<codeOut.length;i++){
                    for(int j=0;j<codeOut.length;j++){
                        if(codeOut[j][i]){
                            gs.fillRect(j*3+pixoff, i*3+pixoff, 3, 3);
                        }
                    }
                }    
            }
            gs.dispose();
            bufImg.flush();
            //生成二維碼圖片
            File imgFile=new File(imgPath);
            ImageIO.write(bufImg, "png", imgFile);
            
            System.out.println("二維碼生成成功盗舰！");
            
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        getQrcodeImg("傻狗", "E:\\qrcode.png");
    }
}

2.ZXing掉奄，google的開源項(xiàng)目晤锹，除了寫二維碼條形碼一維碼什么的也能寫

package com.util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

public class ZxingUtil {
        private static final int BLACK = 0xFF000000;  
        private static final int WHITE = 0xFFFFFFFF;  
         
        private ZxingUtil() {  
        }  
      
        public static BufferedImage toBufferedImage(BitMatrix matrix) {  
            int width = matrix.getWidth();  
            int height = matrix.getHeight();  
            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, matrix.get(x, y) ? BLACK : WHITE);  
                }  
            }  
            return image;  
        }  
      
        public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {  
            BufferedImage image = toBufferedImage(matrix);  
            if (!ImageIO.write(image, format, file)) {  
                throw new IOException("Could not write an image of format " + format + " to " + file);  
            }  
        }  
      
        public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {  
            BufferedImage image = toBufferedImage(matrix);  
            if (!ImageIO.write(image, format, stream)) {  
                throw new IOException("Could not write an image of format " + format);  
            }  
        }  
        
        public static void main(String[] args) throws WriterException, IOException {
            String text = "榆次丶吳彥祖"; // 二維碼內(nèi)容  
            int width = 300; // 二維碼圖片寬度  
            int height = 300; // 二維碼圖片高度  
            String format = "gif";// 二維碼的圖片格式  
              
            Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();  
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");   // 內(nèi)容所使用字符集編碼  
              
            BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);  
            // 生成二維碼  
            File outputFile = new File("E:" + File.separator + "zxing.jpg");  
            writeToFile(bitMatrix, format, outputFile);
            System.out.println("生成成功");
        }
}

3.jquery.qrcode插件宋渔，這個也很簡單毁靶，網(wǎng)頁端生成圖片，資源消耗小

頁面引入js文件

<script type="text/javascript" src="<%=basePath %>/js/jquery.min.js"></script>
<script type="text/javascript" src="<%=basePath %>/js/jquery.qrcode.min.js"></script>```
寫js

('#qrcode').qrcode("http://www.baidu.com");
}); ```
-end-