java生成二维码有很多开发的jar包如zxing是谷歌开发的，这里的话我使用zxing的开发包来实现的。我们在很多项目中需要动态生成二维码，来提供给用户，这样让更多人能够很好的通过二维码来体验自己的应用。
下面贴出代码，已经测试通过，大家可以直接复制代码使用：
java生成二维码
代码如下：
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
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.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
public class MatrixToImageWriter {
private static final int IMAGE_WIDTH = 100;
private static final int IMAGE_HEIGHT = 100;
private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
private static final int FRAME_WIDTH = 2;
private static MultiFormatWriter mutiWriter = new MultiFormatWriter();
public static void encode(String content, int width, int height,
String srcImagePath, String destImagePath) {
try {
ImageIO.write(genBarcode(content, width, height, srcImagePath),
"jpg", new File(destImagePath));
} catch (IOException e) {
e.printStackTrace();
} catch (WriterException e) {
e.printStackTrace();
}
}
private static BufferedImage genBarcode(String content, int width,
int height, String srcImagePath) throws WriterException,
IOException {
BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH,
IMAGE_HEIGHT, true);
int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT];
for (int i = 0; i < scaleImage.getWidth(); i++) {
for (int j = 0; j < scaleImage.getHeight(); j++) {
srcPixels[i][j] = scaleImage.getRGB(i, j);
}
}
Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>();
hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 生成二维码
BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE,
width, height, hint);
// 二维矩阵转为一维像素数组
int halfW = matrix.getWidth() / 2;
int halfH = matrix.getHeight() / 2;
int[] pixels = new int[width * height];
for (int y = 0; y < matrix.getHeight(); y++) {
for (int x = 0; x < matrix.getWidth(); x++) {
// 左上角颜色,根据自己需要调整颜色范围和颜色
if (x > 0 && x < 170 && y > 0 && y < 170) {
Color color = new Color(231, 144, 56);
int colorInt = color.getRGB();
pixels[y * width + x] = matrix.get(x, y) ? colorInt
: 16777215;
}
// 读取图片
else if (x > halfW - IMAGE_HALF_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH
&& y < halfH + IMAGE_HALF_WIDTH) {
pixels[y * width + x] = srcPixels[x - halfW
+ IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
} else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
+ IMAGE_HALF_WIDTH + FRAME_WIDTH)
|| (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
+ IMAGE_HALF_WIDTH + FRAME_WIDTH)
|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
- IMAGE_HALF_WIDTH + FRAME_WIDTH)
|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
+ IMAGE_HALF_WIDTH + FRAME_WIDTH)) {
pixels[y * width + x] = 0xfffffff;
// 在图片四周形成边框
} else {
// 二维码颜色
int num1 = (int) (50 - (50.0 - 13.0) / matrix.getHeight()
* (y + 1));
int num2 = (int) (165 - (165.0 - 72.0) / matrix.getHeight()
* (y + 1));
int num3 = (int) (162 - (162.0 - 107.0)
/ matrix.getHeight() * (y + 1));
Color color = new Color(num1, num2, num3);
int colorInt = color.getRGB();
// 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
pixels[y * width + x] = matrix.get(x, y) ? colorInt
: 16777215;
// 0x000000:0xffffff
}
}
}
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
image.getRaster().setDataElements(0, 0, width, height, pixels);
return image;
}
private static BufferedImage scale(String srcImageFile, int height,
int width, boolean hasFiller) throws IOException {
double ratio = 0.0; // 缩放比例
File file = new File(srcImageFile);
BufferedImage srcImage = ImageIO.read(file);
Image destImage = srcImage.getScaledInstance(width, height,
BufferedImage.SCALE_SMOOTH);
// 计算比例
if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) {
if (srcImage.getHeight() > srcImage.getWidth()) {
ratio = (new Integer(height)).doubleValue()
/ srcImage.getHeight();
} else {
ratio = (new Integer(width)).doubleValue()
/ srcImage.getWidth();
}
AffineTransformOp op = new AffineTransformOp(
AffineTransform.getScaleInstance(ratio, ratio), null);
destImage = op.filter(srcImage, null);
}
if (hasFiller) {
// 补白
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D graphic = image.createGraphics();
graphic.setColor(Color.white);
graphic.fillRect(0, 0, width, height);
if (width == destImage.getWidth(null))
graphic.drawImage(destImage, 0,
(height - destImage.getHeight(null)) / 2,
destImage.getWidth(null), destImage.getHeight(null),
Color.white, null);
else
graphic.drawImage(destImage,
(width - destImage.getWidth(null)) / 2, 0,
destImage.getWidth(null), destImage.getHeight(null),
Color.white, null);
graphic.dispose();
destImage = image;
}
return (BufferedImage) destImage;
}
public static void main(String[] args) throws UnsupportedEncodingException {
// 依次为内容(不支持中文),宽,长,中间图标路径,储存路径
MatrixToImageWriter.encode("http://www.baidu.com/", 512, 512,
"D:\\logo.png", "D:\\2013-01.jpg");
}
}以上就是本文的全部内容，帮助大家设计属于自己的二维码。
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