前段时间因为工作需要，要实现将一段文字或者url生成二维码，然后中间附上logo，下方正中间附上文字的功能。
上网找了几篇教程学习了下，由于没有保存借鉴的博文链接，所以就没po上参考文章的链接啦，感谢几位博主的分享~
大概的实现效果如下图所示：
实现步骤：
（1）导入java_ZXing_jar包，点此下载jar包
（2）编写画二维码代码
package QRCode; import com.google.zxing.common.BitMatrix;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.OutputStream;
import java.io.IOException;
import java.awt.image.BufferedImage; public final class MatrixToImageWriter { private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF; private MatrixToImageWriter() {} 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);
}
} }
MatrixToImageWriter
（3）编写一个类，用来设置中间logo的属性（注：代码中“照片的1/6”,应该是“二维码图片的1/6”，懒得重新上传代码，特此注释下）
package QRCode;
import java.awt.Color;
public class LogoConfig {
// logo默认边框颜色
public static final Color DEFAULT_BORDERCOLOR = Color.WHITE;
// logo默认边框宽度
public static final int DEFAULT_BORDER = 2;
// logo大小默认为照片的1/6
public static final int DEFAULT_LOGOPART = 6;
private final int border = DEFAULT_BORDER;
private final Color borderColor;
private final int logoPart;
/**
* Creates a default config with on color {@link #BLACK} and off color
* {@link #WHITE}, generating normal black-on-white barcodes.
*/
public LogoConfig()
{
this(DEFAULT_BORDERCOLOR, DEFAULT_LOGOPART);
}
public LogoConfig(Color borderColor, int logoPart)
{
this.borderColor = borderColor;
this.logoPart = logoPart;
}
public Color getBorderColor()
{
return borderColor;
}
public int getBorder()
{
return border;
}
public int getLogoPart()
{
return logoPart;
}
}
LogoConfig
（4）为二维码图片添加logo
/**
* 给二维码图片添加Logo
*
* @param qrPic
* @param logoPic
*/
public static void addLogo_QRCode(File qrPic, File logoPic, LogoConfig logoConfig)
{
try
{
if (!qrPic.isFile() || !logoPic.isFile())
{
System.out.print("file not find !");
System.exit(0);
} /**
* 读取二维码图片，并构建绘图对象
*/
BufferedImage image = ImageIO.read(qrPic);
Graphics2D g = image.createGraphics(); /**
* 读取Logo图片
*/
BufferedImage logo = ImageIO.read(logoPic); int widthLogo = image.getWidth()/logoConfig.getLogoPart();
// int heightLogo = image.getHeight()/logoConfig.getLogoPart();
int heightLogo = image.getWidth()/logoConfig.getLogoPart(); //保持二维码是正方形的 // 计算图片放置位置
int x = (image.getWidth() - widthLogo) / 2;
int y = (image.getHeight() - heightLogo) / 2 ; //开始绘制图片
g.drawImage(logo, x, y, widthLogo, heightLogo, null);
g.drawRoundRect(x, y, widthLogo, heightLogo, 10, 10);
g.setStroke(new BasicStroke(logoConfig.getBorder()));
g.setColor(logoConfig.getBorderColor());
g.drawRect(x, y, widthLogo, heightLogo); g.dispose(); ImageIO.write(image, "jpeg", new File("D:/newPic.jpg"));
}
catch (Exception e)
{
e.printStackTrace();
}
}
addLogo_QRCode
（5）为添加好logo的二维码图片添加文字
/**
* @为图片添加文字
* @param pressText 文字
* @param newImg 带文字的图片
* @param targetImg 需要添加文字的图片
* @param fontStyle
* @param color
* @param fontSize
* @param width
* @param heigh
*/
public static void pressText(String pressText, String newImg, String targetImg, int fontStyle, Color color, int fontSize, int width, int height) { //计算文字开始的位置
//x开始的位置：（图片宽度-字体大小*字的个数）/2
int startX = (width-(fontSize*pressText.length()))/2;
//y开始的位置：图片高度-（图片高度-图片宽度）/2
int startY = height-(height-width)/2; try {
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 g = image.createGraphics();
g.drawImage(src, 0, 0, imageW, imageH, null);
g.setColor(color);
g.setFont(new Font(null, fontStyle, fontSize));
g.drawString(pressText, startX, startY);
g.dispose(); FileOutputStream out = new FileOutputStream(newImg);
ImageIO.write(image, "JPEG", out);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
System.out.println("image press success");
} catch (Exception e) {
System.out.println(e);
}
}
pressText
（6）上面功能写好后，可以综合一下进行测试
public static void main(String args[]) {
try {
//二维码表示的内容
String content = "http://www.cnblogs.com/";
//存放logo的文件夹
String path = "E:/QRCodeImage";
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
@SuppressWarnings("rawtypes")
Map hints = new HashMap();
//设置UTF-8， 防止中文乱码
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
//设置二维码四周白色区域的大小
hints.put(EncodeHintType.MARGIN,1);
//设置二维码的容错性
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
//width:图片完整的宽;height:图片完整的高
//因为要在二维码下方附上文字，所以把图片设置为长方形（高大于宽）
int width = 400;
int height = 450;
//画二维码，记得调用multiFormatWriter.encode()时最后要带上hints参数，不然上面设置无效
BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
//qrcFile用来存放生成的二维码图片（无logo，无文字）
File qrcFile = new File(path,"myPicture.jpg");
//logoFile用来存放带有logo的二维码图片（二维码+logo，无文字）
File logoFile = new File(path,"logo.jpg");
//开始画二维码
MatrixToImageWriter.writeToFile(bitMatrix, "jpg", qrcFile);
//在二维码中加入图片
LogoConfig logoConfig = new LogoConfig(); //LogoConfig中设置Logo的属性
addLogo_QRCode(qrcFile, logoFile, logoConfig);
int font = 18; //字体大小
int fontStyle = 1; //字体风格
//用来存放带有logo+文字的二维码图片
String newImageWithText = "D:/imageWithText.jpg";
//带有logo的二维码图片
String targetImage = "D:/newPic.jpg";
//附加在图片上的文字信息
String text = "文字测试一二三四五六123";
//在二维码下方添加文字（文字居中）
pressText(text, newImageWithText, targetImage, fontStyle, Color.BLUE, font, width, height) ;
} catch (Exception e) {
e.printStackTrace();
}
}
main
注意：部分ZXing的jar包导入后，配置EncodeHintType.MARGIN会报错
使用上面附上的java_ZXing_jar包即可。
分享就到此结束啦~~
