java web 二维码生成
pom支持:
<!-- 二维码支持包 start-->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.2.0</version>
</dependency>
<!-- 二维码支持包 end-->
工具类支持:
package com.example.demo.dao.qrcode;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
/**
* @author jin.tang
* @Title: springbootdemo
* @Package com.example.demo.dao.qrcode
* @Description: java web二维码生成器
* @date 2017/12/25
*/
@Slf4j
public class QRCodeUtil {
/**
* 方式一:流的方式直接生成web版本二维码
* 默认的二维码外观(可设置高宽)
* @param url 要生成二维码的路径
* @param response response对象
* @param width 二维码宽度
* @param height 二维码高度
* @throws IOException
*/
public static void getTwoDimension(String url, HttpServletResponse response, int width, int height) throws IOException {
if (url != null && !"".equals(url)) {
ServletOutputStream stream = null;
try {
stream = response.getOutputStream();
QRCodeWriter writer = new QRCodeWriter();
BitMatrix m = writer.encode(url, BarcodeFormat.QR_CODE, height, width);
MatrixToImageWriter.writeToStream(m, "png", stream);
} catch (WriterException e) {
e.printStackTrace();
log.error("生成二维码失败!");
} finally {
if (stream != null) {
stream.flush();
stream.close();
}
}
}
}
/**
* 方式二:返回ResponseEntity的方式显示二维码
* 可设置二维码外观颜色,logo图片
* @param url 二维码对于URL
* @param width 二维码宽
* @param height 二维码高
* @param format 二维码格式
* @param logPath logo图片路径
* @param needLogo 二维码是否需要生成logo
* @return
* @throws WriterException
* @throws IOException
*/
// 直接在页面显示
public static ResponseEntity<byte[]> getResponseEntity(String url, String logPath, boolean needLogo,String format,int width,int height)throws Exception {
BufferedImage image = QRCodeUtil.createImage(url, logPath,needLogo,width,height);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(image, format, out);//将BufferedImage转成out输出流
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
return new ResponseEntity<byte[]>(out.toByteArray(),
headers, HttpStatus.CREATED);
}
/**
* 方式三:以流的形式直接显示二维码
* 可设置二维码外观颜色,logo图片
*/
public static void showQrcode(String url, String logPath,HttpServletResponse response, boolean needLog,String format,int width,int height)throws Exception {
BufferedImage image = QRCodeUtil.createImage(url, logPath,needLog,width,height);
boolean bl = ImageIO.write(image, format, response.getOutputStream());
System.out.println(" boolean is " + bl);
} /** 方式四:生成二维码文件存储
* 可设置二维码外观颜色,logo图片
* @param logPath
* @param destPath 存储路径
* @param fileName 存储文件名称(不需要后缀)
* @param needLog
* @param format
* @param width
* @param height
* @return
* @throws Exception
*/
public static boolean SaveQrCode(String url, String logPath,
boolean needLog,String format,int width,int height,String destPath, String fileName) throws Exception {
boolean flag = false;
BufferedImage image;
try {
image = QRCodeUtil.createImage(url, logPath,needLog,width,height);
File file = new File(destPath);
// 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)
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
String fileUrl = fileName + "."+format;
ImageIO.write(image, format, new File(destPath + "/" + fileUrl));
flag = true;
} catch (Exception e) {
e.printStackTrace();
}
return flag;
} /**
* 生成二维码图片私有方法
*/
private static BufferedImage createImage (String url, String imgPath,boolean needCompress,
int width, int height) throws Exception {
Hashtable hints = new Hashtable();
// 二维码纠错级别：由高到低 H、Q、M、L
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
// 二维码边界空白大小由大到小 4、3、2、1(默认为4)
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(url,
BarcodeFormat.QR_CODE, width, height, hints);
int H = bitMatrix.getHeight();
int W = bitMatrix.getWidth();
int L = getFinderPatternWidth(bitMatrix) + 3;
int[] pixels = new int[W * H];
// 二维码角颜色，依次为左上、左下、右上
Color redColor = new Color(182, 0, 5);
int redColorInt = redColor.getRGB();
Color greenColor = new Color(0, 124, 54);
int greenColorInt = greenColor.getRGB();
Color blueColor = new Color(0, 64, 152);
int blueColorInt = blueColor.getRGB();
for (int y = 0; y < H; y++) {
for (int x = 0; x < W; x++) {
// 颜色渐变程度,RGB(158，255，158)
int num1 = (int) (158 - (158.0 - 30.0) / bitMatrix.getHeight()
* (y + 1));
int num2 = (int) (255 - (255.0 - 80.0) / bitMatrix.getHeight()
* (y + 1));
int num3 = (int) (158 - (158.0 - 130.0) / bitMatrix.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 * W + x] = bitMatrix.get(x, y) ? colorInt : 0xffffff;
}
}
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
image.getRaster().setDataElements(0, 0, W, H, pixels);
if (imgPath == null || "".equals(imgPath)) {
return image;
}
// 插入图片
QRCodeUtil.insertImage(image, imgPath, needCompress,width,height);
return image; }
private static int getFinderPatternWidth(BitMatrix matrix) {
int W = matrix.getWidth();
int H = matrix.getHeight();
int length = 0;
boolean flag = false;
for (int y = 0; y < H; y++) {
for (int x = 0; x < W; x++) {
if (matrix.get(x, y) == true) {
flag = true;
length++;
} else {
if (flag != false) {
return x;
}
}
}
}
return length;
}
/**
* 在二维码中插入图片
*/
private static void insertImage(BufferedImage source, String imgPath,
boolean needCompress,int wid,int hei) throws Exception {
File file = new File(imgPath);
if (!file.exists()) {
System.err.println("" + imgPath + " 该文件不存在！");
return;
}
Image src = ImageIO.read(new File(imgPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) {
// 压缩LOGO
if (width > wid) {
width = wid;
}
if (height > hei) {
height = hei;
}
Image image = src.getScaledInstance(width, height,
Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 绘制缩小后的图
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null);
g.dispose();
src = image;
}
// 插入LOGO位置
Graphics2D graph = source.createGraphics();
int x = (wid - width) / 2;
int y = (hei - height) / 2;
/*
* int x = QRCODE_SIZE - width - 20; int y = QRCODE_SIZE - height - 20;
*/
graph.drawImage(src, x, y, width, height, null);
// logo边框
/*
* Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
* graph.setStroke(new BasicStroke(3f)); graph.draw(shape);
*/
graph.dispose();
}
controller中调用:
package com.example.demo.controller;
import com.example.demo.dao.qrcode.QRCodeUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* @author jin.tang
* @Title: springbootdemo
* @Package com.example.demo.controller
* @Description: ${todo}
* @date 2017/12/25
*/
@Slf4j
@Controller
public class QRCodeController {
/**
* 获得二维码
* @param request
* @param response
*/
@RequestMapping(value = "phoneversion/getTwoDimension",method={RequestMethod.POST,RequestMethod.GET})
public void getTwoDimensionForIOSs(HttpServletRequest request, HttpServletResponse response){
try {
QRCodeUtil.getTwoDimension("https://bbs.hupu.com/bxj", response, 300, 300);
} catch (IOException e) {
e.printStackTrace();
}
} @RequestMapping("/downloadIOSAPPQRCode")
public ResponseEntity<byte[]> downloadIOSAPPController(/*@RequestParam(required = true)String type*/)
throws Exception{
// InputStream is = this.getClass().getClassLoader().getResourceAsStream("app.properties");
// Properties props = new Properties();
// props.load(is);
// String appId = (String)props.get(type);
// String url = "" + appId;
return QRCodeUtil.getResponseEntity("https://www.zhibo8.cc", "F:\\logo.png",true,"png", 300, 300);
} @RequestMapping("/showQrcode")
public void showQrcode(HttpServletRequest request, HttpServletResponse response)
throws Exception{
QRCodeUtil.showQrcode("https://www.zhibo8.cc", "",response,false,"png", 300, 300);
} @RequestMapping("/SaveQrCode")
public void SaveQrCode(HttpServletRequest request, HttpServletResponse response)
throws Exception{
boolean flag=QRCodeUtil.SaveQrCode("https://www.zhibo8.cc", "",false,"png", 300, 300,"D:\\","qrcode");
log.info("flag=="+flag);
}
}
前端显示:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>首页</title>
</head>
<body>
<p>二维码图片1:</p>
<div><img src="/phoneversion/getTwoDimension" alt="" /></div>
<p>二维码图片2:</p>
<img src="/downloadIOSAPPQRCode"/><a href="/downloadIOSAPPQRCode">下载</a>
<p>二维码图片3:</p>
<img src="/showQrcode"/><a href="/showQrcode">下载</a>
</body>
</html>}
以上是 java web 二维码生成 的全部内容， 来源链接： utcz.com/z/390745.html
