标签：
二维码后台生成方法
1.下载包：http://mvnrepository.com/artifact/com.google.zxing/core/3.1.0
core-3.1.0.jar
log4j-1.2.14.jar
或者在pom.xml增加：
<!-- log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<!-- 二维码 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.1.0</version>
</dependency>
2.页面写法：
<div class="thumbnail">
<img alt="这是二维码" src="<%=basePath%>utils/qrcode?content=http://www.baidu.com&width=200&height=200" />
</div>
3.control写法：
private ModelAndView createQrCode(String content, int width, int height,
HttpServletResponse response) {
BufferedImage bi = QrCodeUtils.encodePRToBufferedImage(content, width,
height);
try {
response.setContentType("image/jpeg");
OutputStream os = response.getOutputStream();
ImageIO.write(bi, "jpg", os);
os.close();
} catch (Exception e) {
e.printStackTrace();
try {
response.sendError(500);
} catch (IOException e1) {
e1.printStackTrace();
}
}
return null;
}
package com.taopl.test;
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.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
import org.apache.log4j.Logger;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
public class QrCodeUtils {
private static Logger logger = Logger.getLogger(QrCodeUtils.class);
// 图片宽度的一般
private static final int IMAGE_WIDTH = 80;
private static final int IMAGE_HEIGHT = 80;
private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
private static final int FRAME_WIDTH = 2;
/**
* 生成普通二维码
*
* @param contents
* @param width
* @param height
* @param imgPath
*/
public static void encodePR(String contents, int width, int height, String imgPath) {
Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
// 指定纠错等级
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
// 指定编码格式
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
BarcodeFormat.QR_CODE, width, height, hints);
MatrixToImageWriter.writeToStream(bitMatrix, "jpg",
new FileOutputStream(imgPath));
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成普通二维码
*
* @param contents
* @param width
* @param height
* @param imgPath
*/
public static String generatorPR(String contents, String width, String height,String imgPath) {
String fileName=CommonUtils.getCurTimestamp()+".jpg";
Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
// 指定纠错等级
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
// 指定编码格式
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
try {
if(CommonUtils.isEmpty(width)){
width="100";
}
if(CommonUtils.isEmpty(height)){
height="100";
}
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
BarcodeFormat.QR_CODE, Integer.valueOf(width), Integer.valueOf(height), hints);
MatrixToImageWriter.writeToStream(bitMatrix, "jpg",
new FileOutputStream(imgPath+"/"+fileName));
} catch (Exception e) {
e.printStackTrace();
}
return fileName;
}
/**
* 生成普通二维码
*
* @param contents
* @param width
* @param height
*/
public static BufferedImage encodePRToBufferedImage(String contents, int width, int height) {
Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
// 指定纠错等级
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
// 指定编码格式
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
try {
if(width<=0){
width=100;
}
if(height<=0){
height=100;
}
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
BarcodeFormat.QR_CODE, width, height, hints);
return MatrixToImageWriter.toBufferedImage(bitMatrix);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 生成带图片的二维码
*
* @param content
* @param width
* @param height
* @param srcImagePath
* @param destImagePath
*/
public static void encodePR(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();
}
}
/**
* 针对二维码进行解析
*
* @param imgPath
* @return
*/
public static String decodePR(String imgPath) {
BufferedImage image = null;
Result result = null;
try {
image = ImageIO.read(new File(imgPath));
if (image == null) {
logger.error("the decode image may be not exists.");
}
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, "GBK");
result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 创建条形码
*
* @param contents
* @param width
* @param height
* @param imgPath
*/
public static void encodeBar(String contents, int width, int height, String imgPath) {
// 条形码的最小宽度
int codeWidth = 98;
codeWidth = Math.max(codeWidth, width);
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
BarcodeFormat.EAN_13, codeWidth, height, null);
MatrixToImageWriter.writeToStream(bitMatrix, "png",
new FileOutputStream(imgPath));
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 针对条形码进行解析
*
* @param imgPath
* @return
*/
public static String decodeBar(String imgPath) {
BufferedImage image = null;
Result result = null;
try {
image = ImageIO.read(new File(imgPath));
if (image == null) {
logger.error("the decode image may be not exit.");
}
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
result = new MultiFormatReader().decode(bitmap, null);
return result.getText();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 把传入的原始图像按高度和宽度进行缩放，生成符合要求的图标
*
* @param srcImageFile 源文件地址
* @param height 目标高度
* @param width 目标宽度
* @param hasFiller 比例不对时是否需要补白：true为补白; false为不补白;
* @throws IOException
*/
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;
}
/**
* 产生带有图片的二维码缓冲图像
* @param content
* @param width
* @param height
* @param srcImagePath
* @return
* @throws WriterException
* @throws IOException
*/
private static BufferedImage genBarcode(String content, int width, int height,
String srcImagePath) throws WriterException, IOException {
// 读取源图像
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, "GBK");
hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 生成二维码
MultiFormatWriter mutiWriter = new MultiFormatWriter();
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++) {
// 读取图片
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];
}
// 在图片四周形成边框
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 > 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)
|| (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;
} else {
// 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) ? 0xff000000
: 0xfffffff;
}
}
}
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
image.getRaster().setDataElements(0, 0, width, height, pixels);
return image;
}
public static void main(String[] args) {
String contents = "http://www.google.com";
String imgPath = "d:\\test";
generatorPR(contents, "100", "100",imgPath);
}
}
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原文地址：http://my.oschina.net/u/2322635/blog/383012
