Java之二维码工具类

先上效果

文件结构

下面开始

引入jar包

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>


    <!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>

</dependency>

QRCodeUtils 工具类

import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.common.BitMatrix;import com.itextpdf.text.pdf.qrcode.ErrorCorrectionLevel;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.Hashtable;import java.util.UUID;public class QRCodeUtils {//    private static Integer WIDTH_PIX = 450;//    private static Integer HEIGHT_PIX = 500;    private static String TYPE = "JPEG";    private static String CHAR_TYPE = "UTF-8";    /**     * 二维码填充颜色     */    //黑色    private static Integer COLOR_BLACK = 0XFF000000;    //白色    private static Integer COLOR_WHITE = 0XFFFFFFFF;    private static Integer COLOR_GREEN = 0xff00ff00;    private static Integer COLOR_PINK = 0xFFCBC0FF;    //二维码字体设置    private static String FONT_NAME = "Consolas";    //字体颜色    private static Color FONT_COLOR = Color.GREEN;    //字体大小    private static Integer FONT_SIZE =12;    /**     * 写入二维码     * @param text     * @param filePath     * @param logoPath     * @param COLOR     * @param width_pix     * @param height_pix     * @return     * @throws Exception     */    public static File writeQRImg(String text,String filePath,String logoPath,Integer COLOR,Integer width_pix,Integer height_pix) throws Exception {        //配置参数        Hashtable<EncodeHintType,Object> hints= new Hashtable<EncodeHintType, Object>();        //字符编码        hints.put(EncodeHintType.CHARACTER_SET,CHAR_TYPE);        //容错级别        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);        hints.put(EncodeHintType.MARGIN,3);        //生成二维码        BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE,width_pix,height_pix,hints);        //得到二维码的宽高        int codeWidth = bitMatrix.getWidth();        int codeHeight = bitMatrix.getHeight();        BufferedImage image = new BufferedImage(codeWidth,codeHeight,BufferedImage.TYPE_INT_RGB);        for (int i = 0;i<codeWidth;i++){            for (int j= 0;j<codeHeight;j++){                image.setRGB(i,j,bitMatrix.get(i,j)?COLOR:COLOR_WHITE);            }        }        //写入logo        writeLogo(image,logoPath,text);        File outPutImage= getQRImgFile(filePath);        //写入图片        ImageIO.write(image,TYPE,outPutImage);        return outPutImage;    }    /**     * 写logo     * @param image     * @param logoPath     * @param text     * @throws Exception     */    private static void writeLogo(BufferedImage image, String logoPath,String text) throws Exception {        if (logoPath!=null&&logoPath.length()>0) {            File logoPic =new File(logoPath);            if (logoPic.exists()) {                BufferedImage logoBufferedImage=ImageIO.read(logoPic);                int widthLogo = logoBufferedImage.getWidth(null)>image.getWidth()*2/10?                        (image.getWidth()*2/10):logoBufferedImage.getWidth(null);                int heightLogo= logoBufferedImage.getHeight(null)>image.getHeight()*2/10?                        (image.getHeight()*2/10):logoBufferedImage.getHeight(null);                //设定在图片中间                int x=(image.getWidth()-widthLogo)/2;                int y=(image.getHeight()-heightLogo)/2;                //在原来基础上再加图片                Graphics2D graphics2D = image.createGraphics();                //绘制logo图片                graphics2D.drawImage(logoBufferedImage,x,y,widthLogo,heightLogo,null);                //绘制圆角矩形                graphics2D.drawRoundRect(x,y,widthLogo,heightLogo,15,15);                //设置边框宽度                graphics2D.setStroke(new BasicStroke(2));                //边框颜色                graphics2D.setColor(Color.WHITE);                graphics2D.drawRect(x,y,widthLogo,heightLogo);                //设置字体大小                Font font=new Font(FONT_NAME, Font.PLAIN,FONT_SIZE);//                graphics2D.setColor(FONT_COLOR);//                graphics2D.setFont(font);//                Integer fontStartIndex=image.getWidth()/2-(int)(text.length()*FONT_SIZE*0.7)/2;//                graphics2D.drawString(text,fontStartIndex,image.getHeight()-FONT_SIZE);                //释放图像资源                graphics2D.dispose();                logoBufferedImage.flush();                image.flush();            }        }    }    /**     * 得到二维码图片     * @param filePath     * @return     * @throws Exception     */    private static File getQRImgFile(String filePath) throws Exception {//        String fileName= UUID.randomUUID().toString()+"."+TYPE;        String fileName= "newPic"+"."+TYPE;        File outPutImage = new File(filePath+File.separator+fileName);        if (outPutImage.exists()) {            outPutImage.delete();        }        outPutImage.createNewFile();        return outPutImage;    }    /**     * 写图片下方的水印     * @param pressText     * @param newImg     * @param targetImg     * @param fontStyle     * @param color     * @param fontSize     * @param width     * @param height     * @throws Exception     */    public static void pressText(String pressText,String newImg,String targetImg,int fontStyle,    Color color,int fontSize,int width,int height) throws Exception {        //设置字体开始位置坐标        File file=new File(targetImg);        Image src=ImageIO.read(file);        int imageW=src.getWidth(null);        int imageH=src.getHeight(null);        BufferedImage image =new BufferedImage(imageW,imageH,BufferedImage.TYPE_INT_RGB);        Graphics graphics=image.createGraphics();//        int startX=(width/2-graphics.getFontMetrics().stringWidth(pressText)/2);//        int startY=height-(height-width)/2;        int startX=image.getWidth()/2-(int)(pressText.length()*FONT_SIZE*0.7)/2;        int startY=image.getHeight()-FONT_SIZE;        graphics.drawImage(src,0,0,imageW,imageH,null);        graphics.setColor(color);        graphics.setFont(new Font(null,fontStyle,fontSize));//设置字体        graphics.drawString(pressText,startX,startY);//写入文字        graphics.dispose();        FileOutputStream fileOutputStream= new FileOutputStream(newImg);        ImageIO.write(image,"JPEG",fileOutputStream);        //        JPEGImageEncoder jpegImageEncoder= JPEGCodec.createJPEGEncoder(fileOutputStream);        jpegImageEncoder.encode(image);        fileOutputStream.close();        System.out.println("image press success");    }}

读取文件工具类 （写不写无所谓 方便定义文字而已）

import java.io.*;public class ReadFromFile {    /**     * 读取文件     * @param src     * @return     */    public static String readFromFile(File src){        try {            //汉字的字符集不匹配,比如说用UTF-8字符集去解析GBK字符集的汉字就会变成乱码//            这里不要用FileReader,这个类用的是默认字符集去读取文本,改用InputStreamReader,它的构造方法中能够指定字符集,让它作为BufferedReader的源,就不会乱码了//            如果还是乱码,就把GBK改成UTF-8            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(src),"GBK"));            FileInputStream fileInputStream = new FileInputStream(src);            BufferedInputStream bufferedInputStream= new BufferedInputStream(fileInputStream);            StringBuilder stringBuilder = new StringBuilder();            String content=null;            while ((content=bufferedReader.readLine())!=null){                stringBuilder.append(content);                stringBuilder.append("\r\n");            }            return stringBuilder.toString();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return null;    }}

测试类 

import org.junit.Test;import java.awt.*;import java.io.File;public class QRCodeUtilsTest {    private static Integer COLOR_BLACK = 0XFF000000;    //白色    private static Integer COLOR_WHITE = 0XFFFFFFFF;    private static Integer COLOR_GREEN = 0xff00ff00;    private static Integer COLOR_PINK = 0xE86CA0;    @Test    public void testWriteQRImg() throws Exception {        String outPath="D:/QRCodetest";        String newImg="D:/QRCodetest/imageWithText.jpg";        String targetImg="D:/QRCodetest/newPic.jpeg";        int fontStyle=1;        int fontSize=20;//字体大小        int width=800;        int height=800;        File pressFile =new File("D:/QRCodetest/pressText.txt");        String pressText =ReadFromFile.readFromFile(pressFile);        //读取文件 转为字符串        File file=new File("D:/QRCodetest/text.txt");        String text=ReadFromFile.readFromFile(file);        QRCodeUtils.writeQRImg(text,outPath,"D:/QRCodetest/logo.jpg",COLOR_PINK,width,height);        QRCodeUtils.pressText(pressText,newImg,targetImg,fontStyle, Color.BLACK,fontSize,width,height);    }}

完毕

参考博客：

http://blog.csdn.net/yelllowcong/article/details/78005319