增加下载台码功能

2024-06-13 12:00:06 +08:00
parent 737d38d0a6
commit d693e8afd5
14 changed files with 653 additions and 3 deletions
--- a/eladmin-system/src/main/java/cn/ysk/cashier/utils/QrCodeUtils.java
+++ b/eladmin-system/src/main/java/cn/ysk/cashier/utils/QrCodeUtils.java
@@ -0,0 +1,114 @@
+package cn.ysk.cashier.utils;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.EncodeHintType;
+import com.google.zxing.MultiFormatWriter;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
+
+import javax.imageio.ImageIO;
+import javax.swing.filechooser.FileSystemView;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.OutputStream;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * 二维码工具类
+ *
+ * @author GYJ
+ */
+public class QrCodeUtils {
+
+    //CODE_WIDTH：二维码宽度，单位像素
+    private static final int CODE_WIDTH = 400;
+    //CODE_HEIGHT：二维码高度，单位像素
+    private static final int CODE_HEIGHT = 400;
+    //FRONT_COLOR：二维码前景色，0x000000 表示黑色
+    private static final int FRONT_COLOR = 0x000000;
+    //BACKGROUND_COLOR：二维码背景色，0xFFFFFF 表示白色
+    //演示用 16 进制表示，和前端页面 CSS 的取色是一样的，注意前后景颜色应该对比明显，如常见的黑白
+    private static final int BACKGROUND_COLOR = 0xFFFFFF;
+
+    public static void createCodeToFile(String content, File codeImgFileSaveDir, String fileName) {
+        try {
+            if (StringUtils.isBlank(content) || StringUtils.isBlank(fileName)) {
+                return;
+            }
+            content = content.trim();
+            if (codeImgFileSaveDir==null || codeImgFileSaveDir.isFile()) {
+                //二维码图片存在目录为空，默认放在桌面...
+                codeImgFileSaveDir = FileSystemView.getFileSystemView().getHomeDirectory();
+            }
+            if (!codeImgFileSaveDir.exists()) {
+                //二维码图片存在目录不存在，开始创建...
+                codeImgFileSaveDir.mkdirs();
+            }
+
+            //核心代码-生成二维码
+            BufferedImage bufferedImage = getBufferedImage(content);
+
+            File codeImgFile = new File(codeImgFileSaveDir, fileName);
+            ImageIO.write(bufferedImage, "png", codeImgFile);
+
+            System.out.println("二维码图片生成成功：" + codeImgFile.getPath());
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 生成二维码并输出到输出流, 通常用于输出到网页上进行显示，输出到网页与输出到磁盘上的文件中，区别在于最后一句 ImageIO.write
+     * write(RenderedImage im,String formatName,File output)：写到文件中
+     * write(RenderedImage im,String formatName,OutputStream output)：输出到输出流中
+     * @param content  ：二维码内容
+     * @param outputStream ：输出流，比如 HttpServletResponse 的 getOutputStream
+     */
+    public static void createCodeToOutputStream(String content, OutputStream outputStream) {
+        try {
+            if (StringUtils.isBlank(content)) {
+                return;
+            }
+            content = content.trim();
+            //核心代码-生成二维码
+            BufferedImage bufferedImage = getBufferedImage(content);
+
+            //区别就是这一句，输出到输出流中，如果第三个参数是 File，则输出到文件中
+            ImageIO.write(bufferedImage, "png", outputStream);
+
+            System.out.println("二维码图片生成到输出流成功...");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    //核心代码-生成二维码
+    private static BufferedImage getBufferedImage(String content) throws WriterException {
+
+        //com.google.zxing.EncodeHintType：编码提示类型,枚举类型
+        Map<EncodeHintType, Object> hints = new HashMap();
+
+        //EncodeHintType.CHARACTER_SET：设置字符编码类型
+        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
+
+        //EncodeHintType.ERROR_CORRECTION：设置误差校正
+        //ErrorCorrectionLevel：误差校正等级，L = ~7% correction、M = ~15% correction、Q = ~25% correction、H = ~30% correction
+        //不设置时，默认为 L 等级，等级不一样，生成的图案不同，但扫描的结果是一样的
+        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
+
+        //EncodeHintType.MARGIN：设置二维码边距，单位像素，值越小，二维码距离四周越近
+        hints.put(EncodeHintType.MARGIN, 1);
+
+        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
+        BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, CODE_WIDTH, CODE_HEIGHT, hints);
+        BufferedImage bufferedImage = new BufferedImage(CODE_WIDTH, CODE_HEIGHT, BufferedImage.TYPE_INT_BGR);
+        for (int x = 0; x < CODE_WIDTH; x++) {
+            for (int y = 0; y < CODE_HEIGHT; y++) {
+                bufferedImage.setRGB(x, y, bitMatrix.get(x, y) ? FRONT_COLOR : BACKGROUND_COLOR);
+            }
+        }
+        return bufferedImage;
+    }
+}
--- a/eladmin-system/src/main/java/cn/ysk/cashier/utils/ZipUtils.java
+++ b/eladmin-system/src/main/java/cn/ysk/cashier/utils/ZipUtils.java
@@ -0,0 +1,46 @@
+package cn.ysk.cashier.utils;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+/**
+ * zip工具类
+ *
+ * @author GYJ
+ */
+public class ZipUtils {
+    public static void zipDirectory(File directoryToZip, File zipFile) throws IOException {
+        FileOutputStream fos = new FileOutputStream(zipFile);
+        ZipOutputStream zos = new ZipOutputStream(fos);
+        compressDirectoryToZipfile(directoryToZip, directoryToZip, zos);
+        zos.close();
+        fos.close();
+    }
+
+    private static void compressDirectoryToZipfile(File rootDir, File currentDir, ZipOutputStream zos) throws IOException {
+        File[] files = currentDir.listFiles();
+        if (files != null) {
+            for (File file : files) {
+                if (file.isDirectory()) {
+                    compressDirectoryToZipfile(rootDir, file, zos);
+                } else {
+                    ZipEntry zipEntry = new ZipEntry(rootDir.toURI().relativize(file.toURI()).getPath());
+                    zos.putNextEntry(zipEntry);
+                    FileInputStream fis = new FileInputStream(file);
+                    byte[] buffer = new byte[1024];
+                    int len;
+                    while ((len = fis.read(buffer)) > 0) {
+                        zos.write(buffer, 0, len);
+                    }
+                    fis.close();
+                    zos.closeEntry();
+                }
+            }
+        }
+    }
+
+}