JAVA代码实现二维码制作

首先导入需要用到的jar包

（本人制作小工具包）可在文中上方免费下载

编写生成二维码格式编码

package common;


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;
import com.swetake.util.Qrcode;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;


public class QRCodeUtil
{
  private static final int BLACK = -16777216;
  private static final int WHITE = -1;
  
  public static void zxingCodeCreate(String text, int width, int height, String outPutPath, String imageType)
  {
    Map his = new HashMap();
    
    his.put(EncodeHintType.CHARACTER_SET, "utf-8");
    try
    {
      BitMatrix encode = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, his);
      


      int codeWidth = encode.getWidth();
      int codeHeight = encode.getHeight();
      


      BufferedImage image = new BufferedImage(codeWidth, codeHeight, 1);
      for (int i = 0; i < codeWidth; i++) {
        for (int j = 0; j < codeHeight; j++) {
          image.setRGB(i, j, encode.get(i, j) ? -16777216 : -1);
        }
      }
      File outPutImage = new File(outPutPath);
      if (!outPutImage.exists()) {
        outPutImage.createNewFile();
      }
      ImageIO.write(image, imageType, outPutImage);
    }
    catch (WriterException e)
    {
      e.printStackTrace();
      System.out.println("二维码生成失败");
    }
    catch (IOException e)
    {
      e.printStackTrace();
      System.out.println("生成二维码图片失败");
    }
  }
  
  public static void QRCodeCreate(String content, String imgPath, int version, String logoPath)
  {
    try
    {
      Qrcode qrcodeHandler = new Qrcode();
      
      qrcodeHandler.setQrcodeErrorCorrect('M');
      
      qrcodeHandler.setQrcodeEncodeMode('B');
      
      qrcodeHandler.setQrcodeVersion(version);
      
      int imgSize = 67 + 12 * (version - 1);
      byte[] contentBytes = content.getBytes("gb2312");
      BufferedImage bufImg = new BufferedImage(imgSize, imgSize, 1);
      Graphics2D gs = bufImg.createGraphics();
      gs.setBackground(Color.WHITE);
      gs.clearRect(0, 0, imgSize, imgSize);
      
      gs.setColor(Color.BLACK);
      
      int pixoff = 2;
      if ((contentBytes.length > 0) && (contentBytes.length < 130))
      {
        boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
        for (int i = 0; i < codeOut.length; i++) {
          for (int j = 0; j < codeOut.length; j++) {
            if (codeOut[j][i] != 0) {
              gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
            }
          }
        }
      }
      else
      {
        System.err.println("QRCode content bytes length = " + contentBytes.length + " not in [ 0,130 ]. ");
      }
      if (logoPath != null)
      {
        File icon = new File(logoPath);
        if (icon.exists())
        {
          int width_4 = imgSize / 4;
          int width_8 = width_4 / 2;
          int height_4 = imgSize / 4;
          int height_8 = height_4 / 2;
          Image img = ImageIO.read(icon);
          gs.drawImage(img, width_4 + width_8, height_4 + height_8, width_4, height_4, null);
          gs.dispose();
          bufImg.flush();
        }
        else
        {
          System.out.println("Error: login图片不存在！");
        }
      }
      gs.dispose();
      bufImg.flush();
      
      File imgFile = new File(imgPath);
      if (!imgFile.exists()) {
        imgFile.createNewFile();
      }
      String imgType = imgPath.substring(imgPath.lastIndexOf(".") + 1, imgPath.length());
      
      ImageIO.write(bufImg, imgType, imgFile);
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }
}

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