java如何生成二维码java生成二维码代码
http://www.flypeng.com win10系统 发布时间:2015-09-16 09:54 来源:未知 浏览:加载中

import java.awt.AlphaComposite;

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.text.SimpleDateFormat;

import java.util.Date;

import java.util.Hashtable; import javax.imageio.ImageIO;

import org.zywx.appdo.omm.service.util.MutipartUploadFile;

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.ReaderException;

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 QRUtil {

 

/**

* 编码(将文本生成二维码)

* @param content

*            二维码中的内容

* @param width

*            二维码图片宽度

* @param height

*            二维码图片高度

* @param imagePath

*            二维码图片存放位置

* @return 图片地址

*/  public static String encode(String content, int width, int height,

String imagePath) {

Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();

// 设置编码类型为utf-8

hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

// 设置二维码纠错能力级别为H(最高)

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

hints.put(EncodeHintType.MARGIN, 0);//二维码边框 默认是4

BitMatrix byteMatrix = null;

try {

// 生成二维码

byteMatrix = new MultiFormatWriter().encode(content,

BarcodeFormat.QR_CODE, width, height, hints);

File file = new File(imagePath);

MatrixToImageWriter.writeToFile(byteMatrix, "png", file);

} catch (IOException e) {

e.printStackTrace();

} catch (WriterException e) {

e.printStackTrace();

}

return imagePath;

}

 

/**

* 解码(读取二维码图片中的文本信息)

* @param imagePath

*            二维码图片路径

* @return 文本信息

*/

public static String decode(String imagePath) {

// 返回的文本信息

String content = "";

try {

// 创建图片文件

File file = new File(imagePath);

if (!file.exists()) {

return content;

}

BufferedImage image = null;

image = ImageIO.read(file);

if (null == image) {

return content;

}

// 解码

LuminanceSource source = new BufferedImageLuminanceSource(image);

BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

Hashtable hints = new Hashtable();

hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");

Result rs = new MultiFormatReader().decode(bitmap, hints);

content = rs.getText();

} catch (IOException e) {

e.printStackTrace();

} catch (ReaderException e) {

e.printStackTrace();

}

return content;

}

/**

* 图片打水印

* @param bgImage

*            背景图

* @param waterImg

*            水印图

* @param uniqueFlag

*            生成的新图片名称中的唯一标识,用来保证生成的图片名称不重复,如果为空或为null,将使用当前时间作为标识

* @return 新图片路径

*/

public static String addImageWater(String bgImage, String waterImg,

String uniqueFlag) {

int x = 0;

int y = 0;

String newImgPath = "";

 

if (null == uniqueFlag) {

uniqueFlag = new SimpleDateFormat("yyyyMMddHHmmss")

.format(new Date());

} else if (uniqueFlag.trim().length() < 1) {

uniqueFlag = new SimpleDateFormat("yyyyMMddHHmmss")

.format(new Date());

}

 

String fileName = "" ;

 try {

File file = new File(bgImage);

fileName = file.getName();

Image image = ImageIO.read(file);

int width = image.getWidth(null);

int height = image.getHeight(null);

BufferedImage bufferedImage = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics2D g = bufferedImage.createGraphics();

g.drawImage(image, 0, 0, width, height, null);

Image waterImage = ImageIO.read(new File(waterImg)); // 水印文件

int width_water = waterImage.getWidth(null);

int height_water = waterImage.getHeight(null);

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,

1));

int widthDiff = width - width_water;

int heightDiff = height - height_water;

x = widthDiff / 2;

y = heightDiff / 2;

 

g.drawImage(waterImage, x, y, width_water, height_water, null); // 水印文件结束

g.dispose();

 

if (bgImage.contains(fileName)) {

newImgPath = bgImage.replace(fileName, uniqueFlag + fileName);

fileName = uniqueFlag + fileName ;

}

File newImg = new File(newImgPath);

ImageIO.write(bufferedImage, "png", newImg);

 

File waterFile = new File(waterImg);

 

if (file.exists()) {

file.delete();

}

if (waterFile.exists()) {

waterFile.delete();

}

} catch (IOException e) {

e.printStackTrace();

}

 

return fileName ;

}

 

/**

* 图片缩放

* @param filePath

*            图片路径

* @param height

*            缩放到高度

* @param width

*            缩放宽度

* @param fill

*            比例足时是否填白 true为填白,二维码是黑白色,这里调用时建议设为true

* @return 新图片路径

*/

public static String resizeImg(String filePath, int width, int height,

boolean fill) {

 

String newImgPath = "";

 

try {

double ratio = 0; // 缩放比例

File f = new File(filePath);

String fileName = f.getName();

BufferedImage bi = ImageIO.read(f);

Image itemp = bi.getScaledInstance(width, height,

BufferedImage.SCALE_SMOOTH);

 

if (height != 0 && width != 0) {

// 计算比例

if ((bi.getHeight() > height) || (bi.getWidth() > width)) {

if (bi.getHeight() > bi.getWidth()) {

ratio = (new Integer(height)).doubleValue()

/ bi.getHeight();

} else {

ratio = (new Integer(width)).doubleValue()

/ bi.getWidth();

}

AffineTransformOp op = new AffineTransformOp(

AffineTransform.getScaleInstance(ratio, ratio),

null);

itemp = op.filter(bi, null);

}

}

if (fill) {

BufferedImage image = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics2D g = image.createGraphics();

g.setColor(Color.white);

g.fillRect(0, 0, width, height);

if (width == itemp.getWidth(null)) {

g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2,

itemp.getWidth(null), itemp.getHeight(null),

Color.white, null);

} else {

g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0,

itemp.getWidth(null), itemp.getHeight(null),

Color.white, null);

}

g.dispose();

itemp = image;

}

String now = new SimpleDateFormat("yyyyMMddHHmmss")

.format(new Date());

if (filePath.contains(fileName)) {

newImgPath = filePath.replace(fileName, now + fileName);

}

File newImg = new File(newImgPath);

ImageIO.write((BufferedImage) itemp, "png", newImg);

} catch (IOException e) {

e.printStackTrace();

}

 

return newImgPath;

}

 

/**

* 图片添加边框

* @param mainImgPath

*            要加边框的图片

* @param bgImgPath

*            背景图(实际上是将图片放在背景图上,只利用背景图的边框效果)

* @return 制作完成的图片路径

*/

public static String addWaterBorder(String mainImgPath, String bgImgPath) {

 

String borderImgPath = "";

 

try {

File f = new File(mainImgPath);

 

BufferedImage bi;

 

bi = ImageIO.read(f);

 

// 背景图长宽都比主图多4像素,这是因为我画的背景图的边框效果的大小正好是4像素,

// 主图周边比背景图少4像素正好能把背景图的边框效果完美显示出来

int width = bi.getWidth();

int height = bi.getHeight();

 

int bgWidth = width + 4;

int bgHeight = height + 4;

 

String now = new SimpleDateFormat("yyyyMMddHHmmss")

.format(new Date());

borderImgPath = QRUtil.addImageWater(

QRUtil.resizeImg(bgImgPath, bgHeight, bgWidth, true),

mainImgPath, now);

 

if (f.exists()) {

f.delete();

}

} catch (IOException e) {

e.printStackTrace();

}

 

return borderImgPath;

}

 

/**

* 生成带有中间小图标的二维码

* @param imagePath 二维码保存地址

* @param content  二维码内容

* @param nginxUrl 

* @param width

* @param height

* @return

*/

public static String  createQR(String imagePath,String content,String nginxUrl,int width,int height){

//二维码图片中间的logo

String logoPath = imagePath + "logo.png";

 

imagePath += MutipartUploadFile.DEFAULT_FILE_NAME_GENERATOR.generate("jpg");

// 二维码存放地址

// 生成二维码,返回的是生成好的二维码图片的所在路径

String qrImgPath = QRUtil.encode(content, width, height, imagePath);

// 缩放水印图片,为保证二维码的读取正确,图片不超过二维码图片的五分之一,这里设为六分之一

String waterImgPath = QRUtil.resizeImg(logoPath, width / 6, height / 6, true);

// 生成带有图片的二维码,返回的是生成好的二维码图片的所在路径

String fileName = QRUtil.addImageWater(qrImgPath, waterImgPath, "a");

String filePath = nginxUrl + "appImages/" + fileName;

return filePath;

}

public static void main(String[] args) {

String imagePath ="e:/tmp/flypeng/";

String content = "http://www.flypeng.com";

String nginxUrl= "http://192.168.1.2:8888/" ;

int width = 300;

int height = 300;

System.out.println(createQR(imagePath,content,nginxUrl,width,height));

}

}


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