二维码的生成

package resume.util;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;

/**
 * Created by vinphy on 2015/6/30.
 */
public class QRCodeUtil {

        private static final String CHARSET = "utf-8";
        private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;

        /**
         * 1.生成二维码矩阵
         *@param text 要生成二维码的指定字符串；
         *        width宽； height高
         */
        public static BitMatrix toQRCodeMatrix(String text,Integer width,Integer height){
            //1)确定矩阵宽和高，300*300
            if(width == null || width < 300){
                width = 300;
            }
            if (height == null || height <300){
                height = 300;
            }
            //2)设置二维码图片格式
            Hashtable<EncodeHintType,String> hints = new Hashtable<EncodeHintType,String>();
            //3)设置内容所使用的编码
            hints.put(EncodeHintType.CHARACTER_SET,CHARSET);
            //4)生成矩阵
            BitMatrix matrix = null;
            try {
                matrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE,width,height,hints);
            }catch (WriterException e){
                e.printStackTrace();
            }
            return matrix;
        }

        /**
         * 2.根据点矩阵生成黑白图
         * @param matrix 二维码矩阵
         */
        public static BufferedImage toBufferedImage(BitMatrix matrix){
            //1.得到矩阵长宽
            int width = matrix.getWidth();
            int height = matrix.getHeight();
            //2.得到BufferedIamge实例
            BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
            //3.着色
            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;
        }

        /**
         * 3.根据矩阵图片格式生成文件
         * @param matrix 二维码矩阵；
         *               format 文件格式，如gif；
         *               file 文件
         */
        public static void writeToFile(BitMatrix matrix,String format,File file){
            //1.得到黑白图
            BufferedImage image = toBufferedImage(matrix);
            //2.生成文件
            try {
                if (!ImageIO.write(image,format,file)){
                    throw new IOException(("Could not write an image of format")+format+"to"+file);
                }
            }catch (IOException e){
                e.printStackTrace();
            }
        }

　　}

   

public static void main(String[] args) {
        //1.要转换的文本
        String text = "ningwenhui";
        //2.生成文件
        File file = new File("d:"+File.separator+"vinphy.gif");
        //3.在文件中生成二维码
        writeToFile(toQRCodeMatrix(text, null, null),"gif",file);     
}

　　/**
     * 二维码的生成
     * 根据getInfo（）生成的六位随机数生成对应的二维码
     *
     */
    public void createCode(){
        String text = ""+this.getInfo();
        int width = 450;
        int height = 450;
        /**
         * 设置二维码的参数
         */
        String name = "erweima";
        String path = "D://create";
        HashMap hints = new HashMap();
        // 内容所使用编码
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(text,BarcodeFormat.QR_CODE,width,height,hints);
            // 生成二维码
            File file1 = new File(path,name+".jpg");
            MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }