1.添加依赖
2.编写接口
@ApiOperation(value ="获取最新APP版本二维码")
@GET
@Path("getAppNewVersionqrcode")
public WebApiResponsedownLoad(@Context HttpServletResponse response)throws IOException {
EupdateInfoDto eupdateInfoDto =eupdateInfoService.getUseVersion();
String filePath ="";
if(null!=eupdateInfoDto){
filePath = eupdateInfoDto.getDownloadUrl();
}else {
filePath ="noResource";
}
//File f = ResourceUtils.getFile("classpath:static/app_icon.png");//这个方法对项目打包部署不能用
ClassPathResource classPathResource =new ClassPathResource("static/app_icon.png");
InputStream is = classPathResource.getInputStream();
String qrcode = QRCodeUtil.createQrcode(filePath,is,true);
return response(qrcode);
}
3.QRCodeUtil
package com.jpxx.homepage.homePage.web.utils;
import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Hashtable;
import java.util.Random;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
//import org.apache.log4j.lf5.util.ResourceUtils;
import sun.misc.BASE64Encoder;
/**
* 提供二维码生成和解析工具类
* @author Administrator
*
*/
public class QRCodeUtil {
private static final StringCHARSET ="utf-8";
private static final StringFORMAT_NAME ="JPG";
private static final int QRCODE_SIZE =300; // 二维码尺寸，宽度和高度均是300
private static final int WIDTH =80; //LOGO宽度
private static final int HEIGHT =80; //LOGO高度
/**
* 生成二维码的方法
* @param content 目标url
* @param imgPath logo图片地址
* @param needCompress 是否压缩logo
* @return 二维码图片
* @throws Exception
*/
private static BufferedImagecreateImage(String content, InputStream imgPath,boolean needCompress)throws Exception {
Hashtable hints =new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//指定二维码的纠错等级为高级
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);//指定字符编码为“utf-8”
hints.put(EncodeHintType.MARGIN, 1); //设置图片的边距
//参数1：内容，目标url,参数2：固定写法，参数3：二维码的宽度，参数4：二维码的高度，参数5：二维码属性设置
BitMatrix bitMatrix =new MultiFormatWriter().encode(content,BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
int width = bitMatrix.getWidth();//二维码的宽度
int height = bitMatrix.getHeight();//二维码的高度
BufferedImage image =new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);//生成的二维码image
for (int x =0; x < width; x++) {
for (int y =0; y < height; y++) {
image.setRGB(x, y, bitMatrix.get(x, y) ?0xFF000000:0xFFFFFFFF);
}
}
if (imgPath ==null ||"".equals(imgPath)) {//logo图片地址为null或空时
return image; //只返回二维码图片，无中间的logo
}
// 插入logo图片 参数1：二维码图片，参数2：logo图片地址，参数3：压缩图片
QRCodeUtil.insertImage(image, imgPath, needCompress);
return image;
}
/**
* 插入logo图片
* @param source 二维码图片
* @param imgPath LOGO图片地址
* @param needCompress 是否压缩
* @throws Exception
*/
private static void insertImage(BufferedImage source, InputStream imgPath,boolean needCompress)throws Exception {
/*File file = new File(imgPath);//logo图片地址放入文件if (!file.exists()) {
System.err.println("" + imgPath + " 该文件不存在！");
return;
}*/
Image src = ImageIO.read(imgPath);
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) {// 压缩LOGO
if (width >WIDTH) {//如果上传logo宽>60
width =WIDTH;
}
if (height >HEIGHT) {//如果上传logo高>60
height =HEIGHT;
}
Image image = src.getScaledInstance(width, height,Image.SCALE_SMOOTH);
BufferedImage tag =new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.dispose();
src = image;
}
// 插入LOGO
Graphics2D graph = source.createGraphics();
int x = (QRCODE_SIZE - width) /2;
int y = (QRCODE_SIZE - height) /2;
graph.drawImage(src, x, y, width, height, null);
Shape shape =new RoundRectangle2D.Float(x, y, width, width, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
}
/**
* 生成二维码(内嵌LOGO)
* @param content 内容
* @param imgPath logo地址
* @param destPath 存放目录
* @param needCompress 是否压缩logo
* @throws Exception
*/
public static void encode(String content, InputStream imgPath, String destPath, boolean needCompress)throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath,needCompress); //生成二维码
mkdirs(destPath);
String file =new Random().nextInt(99999) +".jpg";
ImageIO.write(image, FORMAT_NAME, new File(destPath +"/" + file));
}
/**
* 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
* @param destPath 存放目录
*/
public static void mkdirs(String destPath) {
File file =new File(destPath);
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
}
/**
* 生成二维码(内嵌LOGO),没有压缩
*
* @param content 内容
* @param imgPath LOGO地址
* @param destPath 存储地址
* @throws Exception
*/
public static void encode(String content, InputStream imgPath, String destPath)throws Exception {
QRCodeUtil.encode(content, imgPath, destPath, false);
}
/**
* 生成二维码，无内嵌logo
*
* @param content 内容
* @param destPath 存储地址
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static void encode(String content, String destPath,boolean needCompress)throws Exception {
QRCodeUtil.encode(content, null, destPath, needCompress);
}
/**
* 生成二维码
*
* @param content 内容
* @param destPath 存储地址
* @throws Exception
*/
public static void encode(String content, String destPath)throws Exception {
QRCodeUtil.encode(content, null, destPath, false);
}
/**
* 生成二维码(内嵌LOGO)
*
* @param content 内容
* @param imgPath LOGO地址
* @param output 输出流
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static void encode(String content, InputStream imgPath,OutputStream output, boolean needCompress)throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath,needCompress);
ImageIO.write(image, FORMAT_NAME, output);
}
/**
* 生成二维码
* @param content 源内容
* @return 返回二维码图片base64码
* @throws Exception
*/
public static StringcreateQrcode(String content, InputStream imgPath, boolean flag){
try {
BufferedImage image = QRCodeUtil.createImage(content, imgPath,flag);
String qrcode =imageToBase64(image);
return qrcode;
}catch (Exception e) {
e.printStackTrace();
return null;
}
}
public static StringimageToBase64(BufferedImage image){
ByteArrayOutputStream baos =new ByteArrayOutputStream();//io流
try {
ImageIO.write(image, "png", baos);//写入流中
}catch (IOException e) {
e.printStackTrace();
}
byte[] bytes = baos.toByteArray();//转换成字节
return btyeToBase64(bytes);
}
public static StringbtyeToBase64(byte[] bytes){
String png_base64 =new BASE64Encoder().encodeBuffer(bytes).trim();//转换成base64串
png_base64 = png_base64.replaceAll("\n", "").replaceAll("\r", "");//删除\r\n
return "data:image/png;base64,"+png_base64;
}
/**
* 生成二维码
*
* @param content 内容
* @param output 输出流
* @throws Exception
*/
public static void encode(String content, OutputStream output)throws Exception {
QRCodeUtil.encode(content, null, output, false);
}
public static void main(String[] args) {
/*String qrcode = createQrcode("http://www.baidu.com","C:\\",true);
System.out.println(qrcode);*/
}
}
4.在resource下新建static文件夹放入icon图标，打jar包，运行即可