版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/qq_27464169/article/details/89313649
一、导入pom依赖或下载QRCode.jar
<dependency>
<groupId>QRCode</groupId>
<artifactId>QRCode</artifactId>
<version>3.0</version>
</dependency>
附录:
如何将QRCode.jar添加到本地maven仓库中?
1,下载Jar包到本地D盘,例如:D:\QRCode.jar
2,cmd 中执行mvn install 命令 格式为:
mvn install:install-file
-Dfile=<path-to-file>
-DgroupId=<group-id>
-DartifactId=<artifact-id>
-Dversion=<version>
-Dpackaging=<packaging>
例如: mvn install:install-file
-Dfile=D:\QRCode.jar
-DgroupId=QRCode
-DartifactId=QRCode
-Dversion=3.0
-Dpackaging=jar
3,在pom.xml中增加如下语句
<dependency>
<groupId>QRCode
<artifactId>QRCode
<version>3.0
</dependency>
二、二维码图片对象实现QRCodeImage接口
import java.awt.image.BufferedImage;
import jp.sourceforge.qrcode.data.QRCodeImage;
// 二维码图片对象实现QRCodeImage接口
public class QrCodeCreateImg implements QRCodeImage {
BufferedImage bufImg;
public QrCodeCreateImg(BufferedImage bufImg) {
this.bufImg = bufImg;
}
@Override
public int getHeight() {
return bufImg.getHeight();
}
@Override
public int getPixel(int x, int y) {
return bufImg.getRGB(x, y);
}
@Override
public int getWidth() {
return bufImg.getWidth();
}
}
三、生成二维码核心代码
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 javax.imageio.ImageIO;
import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.exception.DecodingFailedException;
import com.swetake.util.Qrcode;
public class QrCodeCreate {
public static final String ImgType = "jpg";
public static final int Size = 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, size);
if (bufImg != null) {
File imgFile = new File(imgPath);
// 生成二维码QRCode图片
ImageIO.write(bufImg, imgType, imgFile);
} else {
throw new Exception("二维码生成失败:" + content);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void encoderQRCode(String content, String imgPath) {
this.encoderQRCode(content, imgPath, ImgType, Size);
}
public void encoderQRCode(String content, String imgPath, String imgType) {
this.encoderQRCode(content, imgPath, imgType, Size);
}
public void encoderQRCode(String content, String imgPath, int size) {
this.encoderQRCode(content, imgPath, ImgType, size);
}
/**
* 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 = QrCodeCreate.qRCodeCommon(content, size);
if (bufImg != null) {
// 生成二维码QRCode图片
ImageIO.write(bufImg, imgType, output);
} else {
throw new Exception("二维码生成失败:" + content);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void encoderQRCode(String content, OutputStream output) {
this.encoderQRCode(content, output, ImgType, Size);
}
public void encoderQRCode(String content, OutputStream output,
String imgType) {
this.encoderQRCode(content, output, imgType, Size);
}
public void encoderQRCode(String content, OutputStream output, int size) {
this.encoderQRCode(content, output, ImgType, size);
}
public static BufferedImage qRCodeCommon(String content, 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
// 原来的计算方法:int imgSize = 67 + 12 * (size - 1);
boolean codeOut[][] = qrcodeHandler.calQrcode(contentBytes);
int imgSize = codeOut.length * 3 + 4;
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) {
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;
}
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 QrCodeCreateImg(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 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 QrCodeCreateImg(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;
}
}
四、客户端调用
public static void main(String[] args) {
String imgPath = "C:/a1.jpg";
String encoderContent = "https://blog.csdn.net/qq_27464169/article/details/89313649";
QrCodeCreate handler = new QrCodeCreate();
handler.encoderQRCode(encoderContent, imgPath);
System.out.println("========encoder success");
String decoderContent = handler.decoderQRCode(imgPath);
System.out.println("解析结果如下:");
System.out.println(decoderContent);
System.out.println("生成二维码:" + imgPath);
System.out.println("========decoder success!!!");
}
五、生成二维码图片样例
创作不易,写个博客不容易,希望路过的各位同胞点个赞,或者评论、关注下!你的支持是我写博客的最大动力!点个赞就行!
如果你想接点程序相关的小活(范围:400元-2000元,土豪可绕行),可以加上我的QQ号(75975175),我这边有机会向您免费提供私活资源,供您参考!