如今,二维码变成一种潮流。这里简单了解下二维码
1.二维码扫描
(1)灰度化
(2)去燥
(3)二值化流程
(4)位置探测图形
(5)译码
(6)联网传输数据
2.java进行二维码制作
(1)说明:二维码背后可以是某网址的地址、有限字数的文字等。
(2)制作逻辑:准备一个网址,将其生成二维码即可。具体实现如下图:
package com.jeecg.util.ercode;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import javax.imageio.ImageIO;
import com.swetake.util.Qrcode;
import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.exception.DecodingFailedException;
public class TwoDimensionCode {
/**
* 生成二维码(QRCode)图片
*
* @param content
* 存储内容
* @param imgPath
* 图片路径
*/
public void encoderQRCode(String content, String imgPath) {
this.encoderQRCode(content, imgPath, "png", 7);
}
/**
* 生成二维码(QRCode)图片
*
* @param content
* 存储内容
* @param output
* 输出流
*/
public void encoderQRCode(String content, OutputStream output) {
this.encoderQRCode(content, output, "png", 7);
}
/**
* 生成二维码(QRCode)图片
*
* @param content
* 存储内容
* @param imgPath
* 图片路径
* @param imgType
* 图片类型
*/
public void encoderQRCode(String content, String imgPath, String imgType) {
this.encoderQRCode(content, imgPath, imgType, 10);
}
/**
* 生成带Logo的二维码(QRCode)图片
*
* @param content
* 存储内容
* @param imgPath
* 图片路径
* @param imgType
* 图片类型
*/
public void encoderQRCode(String content, String imgPath, String imgType, String logoPath) {
this.encoderQRCode(content, imgPath, imgType, 10, logoPath);
}
/**
* 生成二维码(QRCode)图片
*
* @param content
* 存储内容
* @param output
* 输出流
* @param imgType
* 图片类型
*/
public void encoderQRCode(String content, OutputStream output, String imgType) {
this.encoderQRCode(content, output, imgType, 7);
}
/**
* 生成二维码(QRCode)图片
*
* @param content
* 存储内容
* @param imgPath
* 图片路径
* @param imgType
* 图片类型
* @param size
* 二维码尺寸
*/
public void encoderQRCode(String content, String imgPath, String imgType, int size) {
try {
BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
Graphics2D g = bufImg.createGraphics();
File imgFile = new File(imgPath);
/* 加上Logo */
// File logo = new File("Img/logo.png");
File logo = new File("C:/U/a/Desktop/mm.jpg");
// File logo = new File(logoPath);
// 生成二维码QRCode图片
BufferedImage logoimg = ImageIO.read(logo);
/* 设置比列 一般Logo占比百分之二十 */
int widthLogo = logoimg.getWidth(null) > bufImg.getWidth() * 3 / 10 ? (bufImg.getWidth() * 3 / 10)
: logoimg.getWidth(null),
heightLogo = logoimg.getHeight(null) > bufImg.getHeight() * 3 / 10 ? (bufImg.getHeight() * 3 / 10)
: logoimg.getWidth(null);
/* 设置居中 */
int x = (bufImg.getWidth() - widthLogo) / 2;
int y = (bufImg.getHeight() - heightLogo) / 2;
g.drawImage(logoimg, x, y, widthLogo, heightLogo, null);
ImageIO.write(bufImg, imgType, imgFile);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 20171130 生成二维码(QRCode)图片
*
* @param content
* 存储内容
* @param imgPath
* 图片路径
* @param imgType
* 图片类型
* @param size
* 二维码尺寸
*/
public void encoderQRCode(String content, String imgPath, String imgType, int size, String logoPath) {
try {
BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
Graphics2D g = bufImg.createGraphics();
File imgFile = new File(imgPath);
/* 加上Logo */
// File logo = new File(logoPath);
// Tomcat生成二维码QRCode图片
BufferedImage logoimg = ImageIO.read(new URL(logoPath));
// 本地生成二维码
// BufferedImage logoimg = ImageIO.read(new File(logoPath));
/* 设置比列 一般Logo占比百分之二十 */
int widthLogo = logoimg.getWidth(null) > bufImg.getWidth() * 3 / 10 ? (bufImg.getWidth() * 3 / 10)
: logoimg.getWidth(null),
heightLogo = logoimg.getHeight(null) > bufImg.getHeight() * 3 / 10 ? (bufImg.getHeight() * 3 / 10)
: logoimg.getWidth(null);
/* 设置居中 */
int x = (bufImg.getWidth() - widthLogo) / 2;
int y = (bufImg.getHeight() - heightLogo) / 2;
g.drawImage(logoimg, x, y, widthLogo, heightLogo, null);
ImageIO.write(bufImg, imgType, imgFile);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成二维码(QRCode)图片
*
* @param content
* 存储内容
* @param output
* 输出流
* @param imgType
* 图片类型
* @param size
* 二维码尺寸
*/
public void encoderQRCode(String content, OutputStream output, String imgType, int size) {
try {
BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
// 生成二维码QRCode图片
ImageIO.write(bufImg, imgType, output);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成二维码(QRCode)图片的公共方法
*
* @param content
* 存储内容
* @param imgType
* 图片类型
* @param size
* 二维码尺寸
* @return
*/
private BufferedImage qRCodeCommon(String content, String imgType, int size) {
BufferedImage bufImg = null;
try {
Qrcode qrcodeHandler = new Qrcode();
// 设置二维码排错率,可选L(7%)、M(15%)、Q(25%)、H(30%),排错率越高可存储的信息越少,但对二维码清晰度的要求越小
qrcodeHandler.setQrcodeErrorCorrect('M');
qrcodeHandler.setQrcodeEncodeMode('B');
// 设置设置二维码尺寸,取值范围1-40,值越大尺寸越大,可存储的信息越大
qrcodeHandler.setQrcodeVersion(size);
// 获得内容的字节数组,设置编码格式
byte[] contentBytes = content.getBytes("utf-8");
// 图片尺寸
int imgSize = 67 + 12 * (size - 1);
bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufImg.createGraphics();
// 设置背景颜色
gs.setBackground(Color.WHITE);
gs.clearRect(0, 0, imgSize, imgSize);
// 设定图像颜色> BLACK
gs.setColor(Color.BLACK);
// 设置偏移量,不设置可能导致解析出错
int pixoff = 2;
// 输出内容> 二维码
if (contentBytes.length > 0 && contentBytes.length < 800) {
boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
for (int i = 0; i < codeOut.length; i++) {
for (int j = 0; j < codeOut.length; j++) {
if (codeOut[j][i]) {
gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
}
}
}
} else {
throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800].");
}
gs.dispose();
bufImg.flush();
} catch (Exception e) {
e.printStackTrace();
}
return bufImg;
}
/**
* 解析二维码(QRCode)
*
* @param imgPath
* 图片路径
* @return
*/
public String decoderQRCode(String imgPath) {
// QRCode 二维码图片的文件
File imageFile = new File(imgPath);
BufferedImage bufImg = null;
String content = null;
try {
bufImg = ImageIO.read(imageFile);
QRCodeDecoder decoder = new QRCodeDecoder();
content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8");
} catch (IOException e) {
System.out.println("Error: " + e.getMessage());
e.printStackTrace();
} catch (DecodingFailedException dfe) {
System.out.println("Error: " + dfe.getMessage());
dfe.printStackTrace();
}
return content;
}
/**
* 解析二维码(QRCode)
*
* @param input
* 输入流
* @return
*/
public String decoderQRCode(InputStream input) {
BufferedImage bufImg = null;
String content = null;
try {
bufImg = ImageIO.read(input);
QRCodeDecoder decoder = new QRCodeDecoder();
content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8");
} catch (IOException e) {
System.out.println("Error: " + e.getMessage());
e.printStackTrace();
} catch (DecodingFailedException dfe) {
System.out.println("Error: " + dfe.getMessage());
dfe.printStackTrace();
}
return content;
}
public static void main(String[] args) {
// String TshortURL="http://120.27.11.218:8007/a/RFreIz";
String TshortURL = "http://120.27.11.218:8008/jeecg-master/userErftlCon.do?shortUrl=eiYnq2";
String logoPath2 = "E:/j2eeWorkspace/jeecg-master/src/main/webapp/images/equipment.png";
String imgPath = "F:/U/A/Desktop/user.png";
String imgPath2 = "F:/U/A/Desktop/equipment.png";
String logoPath = "E:/j2eeWorkspace/jeecg-master/src/main/webapp/images/user.png";
TwoDimensionCode handler = new TwoDimensionCode();
handler.encoderQRCode(TshortURL, imgPath, "png", logoPath);
System.out.println("======== encoder success");
}
}
引用类:
package com.jeecg.util.ercode;
import java.awt.image.BufferedImage;
import jp.sourceforge.qrcode.data.QRCodeImage;
/*二维码图片对象*/
public class TwoDimensionCodeImage implements QRCodeImage {
BufferedImage bufImg;
public TwoDimensionCodeImage(BufferedImage bufImg) {
this.bufImg = bufImg;
}
@Override
public int getHeight() {
// TODO Auto-generated method stub
return bufImg.getHeight();
}
@Override
public int getPixel(int x, int y) {
// TODO Auto-generated method stub
return bufImg.getRGB(x, y);
}
@Override
public int getWidth() {
// TODO Auto-generated method stub
return bufImg.getWidth();
}
}
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