java生成二維碼程式碼，並且插入logo，因為要大批量生成，所以加入了執行緒池以及佇列，並且儘可能的減少了程式碼內部的計算，在提高程式碼效率時發現幾點注意事項
1.內部logo圖儘量使用恰好大小的，否則需要壓縮圖片會增加許多不必要的計算。
2.二維碼的寬高很大的影響生成速度，200x200px 與600x600px之間速度能差將近10倍，不完全測試 200x200px生成每千張可達到10s以下
3.加了一個簡單的讀圖快取，但是效果貌似沒那麼明顯。。。就當是心理作用好了
刪除了其中的一些業務邏輯，但是核心程式碼都在這裡，如有錯誤歡迎指出。

import javax.imageio.ImageIO;

//logo執行緒
public class LogoThread implements Runnable{

    private File file;
    private String name;
    private int height;
    private int width;
    private int dw;
    @Override
    public void run() {
         BufferedImage image;
         long start = 0;
        try {
            start = System.currentTimeMillis();
            image = QRCodeUtil.createImage(QRCodeUtil.URL+name,QRCodeUtil.LogoPath,width,height,dw);
            ImageIO.write(image,"png",file);
            file=null;
            image=null;
            if(QRCodeUtil.DEBUG){
            }
        } catch (Exception e) {
            e.printStackTrace();
        }  
    }
    public File getFile() {
        return file;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setFile(File file) {
        this.file = file;
    }
    public int getDw() {
        return dw;
    }
    public void setDw(int dw) {
        this.dw = dw;
    }
    public int getHeight() {
        return height;
    }
    public void setHeight(int height) {
        this.height = height;
    }
    public int getWidth() {
        return width;
    }
    public void setWidth(int width) {
        this.width = width;
    }
    

}
 

</pre><pre name="code" class="java">

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import javax.imageio.ImageIO;


import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * 二維碼工具類
 * 
 */
public class QRCodeUtil {

    private static Map<String, Image> picCache = new HashMap<String, Image>();
    // 容錯率
    private static final double rate = 0.30;
    private static final ErrorCorrectionLevel E_RATE = ErrorCorrectionLevel.L;
    // 二維碼寬
    private static final int QRCODE_WIDTH = 200;
    // 二維碼高
    private static final int QRCODE_HEIGHT = 200;// 預設寬高相同
    // logo地址
    public static final String LogoPath = "D:" + File.separator + "xiaojuhua.jpg";
    // 二維碼url地址
    public static final String URL = "http://test.com?param=";
    // 生成路徑
    private static final String rootPath = "D:" + File.separator + "picFolder2";
    // 是否debug
    public static final boolean DEBUG = false;
    
    public static void main(String[] args) throws IOException,
            InterruptedException {
        double d_w = Math.sqrt(QRCODE_WIDTH * QRCODE_HEIGHT * rate) / 2; // 計算內部logo寬
        int dw = (int) d_w;
        BlockingQueue queue = new ArrayBlockingQueue(40);
        ThreadPoolExecutor executor = new ThreadPoolExecutor(8, 8, 1,
                TimeUnit.DAYS, queue);
            int max=10000000;
            String str_j = "";
            for (int j = 0; j < max; j++) {
                try {
                    if (executor.getQueue().size() > 30) {
                        Thread.sleep(200);
                    }
                    str_j = String.valueOf(j+1);
                    File f1 = new File(rootPath + File.separator
                            + str_j.substring(0, 3) + File.separator
                            + str_j.substring(3, 6));
                    if (!f1.exists()) {
                        f1.mkdirs();
                    }
                    File f2 = new File(f1, str_j + ".png");
                    LogoThread lt = new LogoThread();
                    lt.setFile(f2);
                    lt.setName(str_j);
                    lt.setDw(dw);
                    lt.setWidth(QRCODE_WIDTH);
                    lt.setHeight(QRCODE_HEIGHT);
                    executor.execute(lt);
                    Thread.sleep(20);
                    if (DEBUG) {
                      System.out.println("執行緒池中執行緒數目："+executor.getPoolSize()+
                      "，佇列中等待執行的任務數目："+
                      executor.getQueue().size()+"，已執行玩別的任務數目："
                      +executor.getCompletedTaskCount());
                     System.out.println(Runtime.getRuntime().totalMemory()-Runtime.getRuntime().freeMemory());
                    }

                } catch (Exception e) {
                    System.out.println(e.getMessage() + "," + str_j);
                    Thread.sleep(500);
                    continue;
                }
            }
        
        executor.shutdown();
    }
    
    /**
     * 建立二維碼
     * 
     * @param content
     *            文字內容
     * @param imgPath
     *            讀取logo圖片路徑
     * @param QRCODE_WIDTH
     *            二維碼寬
     * @param QRCODE_HEIGHT
     *            二維碼高
     * @param dw
     *            內部logo寬
     * @return
     * @throws Exception
     */
    public static BufferedImage createImage(String content, String imgPath,
            int QRCODE_WIDTH, int QRCODE_HEIGHT, int dw) throws Exception {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.ERROR_CORRECTION, E_RATE);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
                BarcodeFormat.QR_CODE, QRCODE_WIDTH, QRCODE_HEIGHT, hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000
                        : 0xFFFFFFFF);
            }
        }
        // 插入logo
        QRCodeUtil.insertImage(image, imgPath, QRCODE_WIDTH, QRCODE_HEIGHT, dw);
        return image;
    }

    /**
     * 插入LOGO
     * 
     * @param source
     *            二維碼圖片
     * @param imgPath
     *            LOGO圖片地址

     * @throws Exception
     */
    private static void insertImage(BufferedImage source, String imgPath,
            int QRCODE_WIDTH, int QRCODE_HEIGHT, int dw) throws Exception {
        Image src;
        if (picCache.get("cache") != null) {
            src = picCache.get("cache");
        } else {
            File file = new File(imgPath);
            if (!file.exists()) {
                System.err.println("" + imgPath + "   該檔案不存在！");
                return;
            }
            src = ImageIO.read(new File(imgPath));
            picCache.put("cache", src);// 快取
            System.out.println("未讀快取");
        }
        /*
         * double d_w=Math.sqrt(QRCODE_WIDTH*QRCODE_HEIGHT*rate)/2; int
         * int_w=(int)d_w;
         */
        // double d_h=Math.sqrt(QRCODE_WIDTH*QRCODE_HEIGHT*rate)/2.5;
        Image image = src.getScaledInstance(dw, dw, Image.SCALE_SMOOTH);
        BufferedImage tag = new BufferedImage(dw, dw,
                BufferedImage.TYPE_INT_RGB);
        Graphics g = tag.getGraphics();
        g.drawImage(image, 0, 0, null); // 繪製縮小後的圖
        g.dispose();
        src = image;
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_WIDTH - dw) / 2;
        // int y = (QRCODE_HEIGHT - int_w) / 2;
        graph.drawImage(src, x, x, dw, dw, null); // y
        Shape shape = new RoundRectangle2D.Float(x, x, dw, dw, 6, 6);// y
        graph.setStroke(new BasicStroke(12f));
        graph.draw(shape);
        graph.dispose();
    }

}