【java】二维码的生成和使用

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maven 依赖：

使用google的zxing包

<groupId>com.google.zxing</groupId>

</dependency>

<groupId>com.google.zxing</groupId>

<artifactId>javase</artifactId>

</dependency>

工具类代码：

package com.kaiyuan.kp.kyshop.app.twoDimensionCode;

import java.awt.BasicStroke;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.InputStream;

import java.io.OutputStream;

import java.nio.file.Path;

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.client.j2se.MatrixToImageWriter;

import com.google.zxing.common.BitMatrix;

/**

*二维码生成工具类（ZXing）

public class TwoDimensionCodeUtil {

/**

* 生成二维码(ZXing)图片，编码默认UTF-8

* @param content 二维码内容

* @param path 文件存储路径，不包括文件名称

* @param fileName 文件名称，不加后缀

* @param imageType 图片类型

* @param width 宽度

* @param height 高度

public static void encoderTwoDimensionCodeToFile(String content,String path,String fileName,String imageType,int width,int height){

MultiFormatWriter multiFormatWriter = new MultiFormatWriter();

Map<EncodeHintType,String> hints = new HashMap<EncodeHintType,String>();

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

try {

BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, width, height,hints);

Path filepath = new File(path+fileName+"."+imageType).toPath();

MatrixToImageWriter.writeToPath(bitMatrix, imageType, filepath);

} catch (Exception e){

e.printStackTrace();

}

/**

* 将二维码输出到流，编码默认UTF-8

* @param content 二维码内容

* @param imageType 图片类型

* @param width 宽度

* @param height 高度

* @param out 输出流

public static void encoderTwoDimensionCodeToStream(String content,String imageType,int width,int height,OutputStream out){

MultiFormatWriter multiFormatWriter = new MultiFormatWriter();

Map<EncodeHintType,String> hints = new HashMap<EncodeHintType,String>();

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

try {

BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, width, height,hints);

MatrixToImageWriter.writeToStream(bitMatrix, imageType, out);

} catch (Exception e) {

e.printStackTrace();

}

/**

* 生成带logo的二维码图片流

* @param content

* @param imageType

* @param width

* @param height

* @param out

public static void encoderLogoTwoDimensionCodeToStream(String content,String imageType,int width,int height,OutputStream out){

MultiFormatWriter multiFormatWriter = new MultiFormatWriter();

Map<EncodeHintType,String> hints = new HashMap<EncodeHintType,String>();

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

ByteArrayOutputStream o1 =new ByteArrayOutputStream();

try {

BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, width, height,hints);

MatrixToImageWriter.writeToStream(bitMatrix, imageType, o1);

} catch (Exception e) {

e.printStackTrace();

}

ByteArrayInputStream in = new ByteArrayInputStream(o1.toByteArray());

encoderLogoTwoDimensionCodeToStream( in, new File("d:/logo.jpg"), imageType, new LogoConfig(), out);

}

public static void encoderLogoTwoDimensionCodeToStream(InputStream in, File logoPic,String imageType, LogoConfig logoConfig,OutputStream out)

{

try

{

/**

* 读取二维码图片，并构建绘图对象

BufferedImage image = ImageIO.read(in);

Graphics2D g = image.createGraphics();

/**

* 读取Logo图片

BufferedImage logo = ImageIO.read(logoPic);

int widthLogo = logo.getWidth(), heightLogo = logo.getHeight();

// 计算图片放置位置

int x = (image.getWidth() - widthLogo) / 2;

int y = (image.getHeight() - logo.getHeight()) / 2;

//开始绘制图片

g.drawImage(logo, x, y, widthLogo, heightLogo, null);

g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15);

g.setStroke(new BasicStroke(logoConfig.getBorder()));

g.setColor(logoConfig.getBorderColor());

g.drawRect(x, y, widthLogo, heightLogo);

g.dispose();

ImageIO.write(image, imageType, out);

}

catch (Exception e)

{

e.printStackTrace();

}

使用方式：

String content = httpRequest.getParameter("content"); //二维码映射的实际Url

String imageType = httpRequest.getParameter("imageType"); //图片类型

int width = Integer.parseInt(httpRequest.getParameter("width")); //二维码宽

int height = Integer.parseInt(httpRequest.getParameter("height")); //二维码高

if (Strings.isNullOrEmpty(content)) {

LOGGER.warn("The content is null or empty");

return (T) new Result(StatusCodes.BAD_REQUEST, false);

}

httpResponse.setContentType("image/jpg");

try {

TwoDimensionCodeUtil.encoderTwoDimensionCodeToStream(content, imageType, width, height,

httpResponse.getOutputStream());

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

页面使用返回的流：

html：

<img id="Img" src="" />

js：

var src = encodeURI("/twoDimensionCode/erweima?content=www.baidu.com&imageType=jpg&width=25&height=25");
$("#Img").attr("src",src);

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