【JAVA】用二维码生成工具，取出无法联网电脑的文件内内容

背景

内网环境开发，内外网不互通，想拿东西进出都得申请，有时候写代码时总结了一些帮助开发的工具类，想拿出来做点笔记方便后续的使用，但是由于内网原因，只能再敲一遍代码，这属实是很难受，由于内网仓库二维码开发工具包都有，所以就有了将文件生成二维码再手机扫码拿出文件的想法。

实操（完整类在文末）所需jar包


  com.google.zxing
  javase
  3.4.1


  com.google.zxing
  core
  3.4.1

将字符串生成二维码到指定位置

	 
    public static String generateQRImage(String content,
                                         int width,
                                         int height,
                                         String outPath,
                                         String format,
                                         String charset,
                                         String imageName) throws Exception {
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        Map encodeHintTypeStringMap = new HashMap<>();
        encodeHintTypeStringMap.put(EncodeHintType.CHARACTER_SET, charset);
        BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE,
                width, height, encodeHintTypeStringMap);
        File file = new File(outPath);
        mkdirs(file);
        String fullPath = outPath + File.separator + imageName;
        Path target = FileSystems.getDefault().getPath(fullPath);
        MatrixToImageWriter.writeToPath(bitMatrix, format, target);
        return fullPath;
    }

将指定文件内容生成二维码

	 
    public static String generateQRImage(File targetFile,
                                         int width,
                                         int height,
                                         String outPath,
                                         String format,
                                         String charset,
                                         String imageName) throws Exception {
        String content = Files.readString(targetFile.toPath(), Charset.forName(DEFAULT_CHARSET));
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        File file = new File(outPath);
        mkdirs(file);
        Map encodeHintTypeStringMap = new HashMap<>();
        encodeHintTypeStringMap.put(EncodeHintType.CHARACTER_SET, charset);
        BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE,
                width, height, encodeHintTypeStringMap);
        String fullPath = outPath + File.separator + imageName;
        Path target = FileSystems.getDefault().getPath(fullPath);
        MatrixToImageWriter.writeToPath(bitMatrix, format, target);
        return fullPath;
    }

    public static String generateQRImageByFiles(List targetFiles, String outPath) throws Exception {

            StringBuilder stringBuilder = new StringBuilder();
            for (File item : targetFiles) {
                // 默认文件名
                String defaultName = item.getName() + ".png";
                String re = generateQRImage(item, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                        outPath, DEFAULT_FORMAT, DEFAULT_CHARSET, defaultName);
                stringBuilder.append(re).append("n");
            }
            return stringBuilder.toString();
        }
  
    public static String generateQRImageByFilePaths(List targetFilesPaths, String outPath) throws Exception {
        StringBuilder stringBuilder = new StringBuilder();
        for (String item : targetFilesPaths) {
            File file = new File(item);
            // 默认文件名
            String defaultName = file.getName() + ".png";
            String re = generateQRImage(file, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                    outPath, DEFAULT_FORMAT, DEFAULT_CHARSET, defaultName);
            stringBuilder.append(re).append("n");
        }
        return stringBuilder.toString();
    }

读取二维码内容为String

	 
    public static String decodeQrCode(String imgPath) throws Exception {
        BufferedImage bufferedImage = ImageIO.read(new FileInputStream(imgPath));
        LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
        Binarizer binarizer = new HybridBinarizer(source);
        BinaryBitmap bitmap = new BinaryBitmap(binarizer);
        HashMap decodeHints = new HashMap<>(16);
        decodeHints.put(DecodeHintType.CHARACTER_SET, DEFAULT_CHARSET);
        Result result = new MultiFormatReader().decode(bitmap, decodeHints);
        return result.getText();
    }

读取二维码内容将文件以指定名字生成到指定文件夹下

	
    public static String decodeQrCodeToPath(String imgPath, String targetPath, String fileName) throws Exception {
        BufferedImage bufferedImage = ImageIO.read(new FileInputStream(imgPath));
        LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
        Binarizer binarizer = new HybridBinarizer(source);
        BinaryBitmap bitmap = new BinaryBitmap(binarizer);
        HashMap decodeHints = new HashMap<>(16);
        decodeHints.put(DecodeHintType.CHARACTER_SET, DEFAULT_CHARSET);
        Result result = new MultiFormatReader().decode(bitmap, decodeHints);
        String text = result.getText();
        //将文件以指定名字生成到指定文件夹下
        File dir = new File(targetPath);
        mkdirs(dir);
        File targetFile = new File(targetPath + File.separator + fileName);
        if (!targetFile.exists()) {
            targetFile.createNewFile();
        }
        FileWriter fileWriter = new FileWriter(targetFile);
        fileWriter.write(text);
        fileWriter.flush();
        fileWriter.close();
        return targetFile.getAbsolutePath();
    }

使用实例

public static void main(String[] args) throws Exception {
  String outPath = "/Users/Documents/myProject/back/src/main/resources";
  String file2 = "/Users/Documents/myProject/back/src/main/resources/application.properties";

  //将file2文件生成二维码输出到outpath下
  String image = GenerateUtil.generateQRImage(new File(file2), outPath);
	
  //解析 刚才输出的二维码图片 到 outPath下并命名为application-copy.yml
  System.out.println(GenerateUtil.decodeQrCodeToPath(image, outPath, "application-copy.yml"));

}

附完整类

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeWriter;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.nio.charset.Charset;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


@SuppressWarnings("all")
public class GenerateUtil {

    
    private final static int DEFAULT_WIDTH = 400;
    
    private final static int DEFAULT_HEIGHT = 400;
    
    private final static String DEFAULT_FORMAT = "PNG";
    
    private final static String DEFAULT_CHARSET = "UTF-8";


    
    public static String generateQRImage(String content,
                                         int width,
                                         int height,
                                         String outPath,
                                         String format,
                                         String charset,
                                         String imageName) throws Exception {
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        Map encodeHintTypeStringMap = new HashMap<>();
        encodeHintTypeStringMap.put(EncodeHintType.CHARACTER_SET, charset);
        BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE,
                width, height, encodeHintTypeStringMap);
        File file = new File(outPath);
        mkdirs(file);
        String fullPath = outPath + File.separator + imageName;
        Path target = FileSystems.getDefault().getPath(fullPath);
        MatrixToImageWriter.writeToPath(bitMatrix, format, target);
        return fullPath;
    }

    private static void mkdirs(File file) {
        if (!file.exists() || !file.isDirectory()) {
            file.mkdirs();
        }
    }

    public static String generateQRImage(String content, String outPath, String format, String imageName)
            throws Exception {
        return generateQRImage(content, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                outPath, format, DEFAULT_CHARSET, imageName);
    }

    public static String generateQRImage(String content, String outPath, String imageName) throws Exception {
        return generateQRImage(content, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                outPath, DEFAULT_FORMAT, DEFAULT_CHARSET, imageName);
    }

    public static String generateQRImage(String content, String outPath) throws Exception {
        // 默认文件名
        String defaultName = "qrCode" + System.currentTimeMillis() + ".png";
        return generateQRImage(content, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                outPath, DEFAULT_FORMAT, DEFAULT_CHARSET, defaultName);
    }

    
    public static String generateQRImage(File targetFile,
                                         int width,
                                         int height,
                                         String outPath,
                                         String format,
                                         String charset,
                                         String imageName) throws Exception {
        //读取目标文件的内容，实际文件如太大生成的二维码就黑压压一片根本没眼看
        String content = Files.readString(targetFile.toPath(), Charset.forName(DEFAULT_CHARSET));
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        File file = new File(outPath);
        mkdirs(file);
        Map encodeHintTypeStringMap = new HashMap<>();
        encodeHintTypeStringMap.put(EncodeHintType.CHARACTER_SET, charset);
        BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE,
                width, height, encodeHintTypeStringMap);
        String fullPath = outPath + File.separator + imageName;
        Path target = FileSystems.getDefault().getPath(fullPath);
        MatrixToImageWriter.writeToPath(bitMatrix, format, target);
        return fullPath;
    }

    public static String generateQRImage(File targetFile, String outPath, String format, String imageName)
            throws Exception {
        return generateQRImage(targetFile, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                outPath, format, DEFAULT_CHARSET, imageName);
    }

    public static String generateQRImage(File targetFile, String outPath, String imageName) throws Exception {
        return generateQRImage(targetFile, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                outPath, DEFAULT_FORMAT, DEFAULT_CHARSET, imageName);
    }

    public static String generateQRImage(File targetFile, String outPath) throws Exception {
        // 默认文件名
        String defaultName = targetFile.getName() + ".png";
        return generateQRImage(targetFile, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                outPath, DEFAULT_FORMAT, DEFAULT_CHARSET, defaultName);
    }

    public static String generateQRImageByFiles(List targetFiles, String outPath) throws Exception {

        StringBuilder stringBuilder = new StringBuilder();
        for (File item : targetFiles) {
            // 默认文件名
            String defaultName = item.getName() + ".png";
            String re = generateQRImage(item, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                    outPath, DEFAULT_FORMAT, DEFAULT_CHARSET, defaultName);
            stringBuilder.append(re).append("n");
        }
        return stringBuilder.toString();
    }

    public static String generateQRImageByFilePaths(List targetFilesPaths, String outPath) throws Exception {
        StringBuilder stringBuilder = new StringBuilder();
        for (String item : targetFilesPaths) {
            File file = new File(item);
            // 默认文件名
            String defaultName = file.getName() + ".png";
            String re = generateQRImage(file, DEFAULT_WIDTH, DEFAULT_HEIGHT,
                    outPath, DEFAULT_FORMAT, DEFAULT_CHARSET, defaultName);
            stringBuilder.append(re).append("n");
        }
        return stringBuilder.toString();
    }


    
    public static String decodeQrCode(String imgPath) throws Exception {
        BufferedImage bufferedImage = ImageIO.read(new FileInputStream(imgPath));
        LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
        Binarizer binarizer = new HybridBinarizer(source);
        BinaryBitmap bitmap = new BinaryBitmap(binarizer);
        HashMap decodeHints = new HashMap<>(16);
        decodeHints.put(DecodeHintType.CHARACTER_SET, DEFAULT_CHARSET);
        Result result = new MultiFormatReader().decode(bitmap, decodeHints);
        return result.getText();
    }

    
    public static String decodeQrCodeToPath(String imgPath, String targetPath, String fileName) throws Exception {
        BufferedImage bufferedImage = ImageIO.read(new FileInputStream(imgPath));
        LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
        Binarizer binarizer = new HybridBinarizer(source);
        BinaryBitmap bitmap = new BinaryBitmap(binarizer);
        HashMap decodeHints = new HashMap<>(16);
        decodeHints.put(DecodeHintType.CHARACTER_SET, DEFAULT_CHARSET);
        Result result = new MultiFormatReader().decode(bitmap, decodeHints);
        String text = result.getText();
        //将文件以指定名字生成到指定文件夹下
        File dir = new File(targetPath);
        mkdirs(dir);
        File targetFile = new File(targetPath + File.separator + fileName);
        if (!targetFile.exists()) {
            targetFile.createNewFile();
        }
        FileWriter fileWriter = new FileWriter(targetFile);
        fileWriter.write(text);
        fileWriter.flush();
        fileWriter.close();
        return targetFile.getAbsolutePath();
    }
}

【JAVA】用二维码生成工具，取出无法联网电脑的文件内内容

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