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用Base64儲存pdf等檔案類型

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前言

紀錄使用Java串流類別來操作檔案，並用Base64來讀寫各種檔案類型(pdf/pptx/…)

壓縮檔包檔

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import java.io.*;
import java.util.Base64;
import java.util.Date;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class Base64Transformator {
    public static String saveBase64ToFile(String name, String userFileName) {
        String defaultPath = String.format("D:\\%tF\\%s\\", new Date(), name);
        File file = new File(defaultPath);
        if(!file.exists()) {
            file.mkdirs();
        }
        String base64String = "UEsDBBQABg.......";
        String fileName = defaultPath + userFileName; //"test123.pptx";
        byte dearr[] = Base64.getDecoder().decode(base64String);
        try(FileOutputStream fos = new FileOutputStream(new File(fileName))) {
            fos.write(dearr);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return fileName;
    }
    public static void zipMultipleFile(String path) {
        String zipFileName = path + "result.zip";
        File folder = new File(path);
        File[] listOfFiles = folder.listFiles();
        if(listOfFiles != null && listOfFiles.length > 0) {
            try(ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipFileName))) {
                for (File file : listOfFiles) {
                    if (file.isFile() && !file.getName().equals(zipFileName)) {
                        zipOutputStream.putNextEntry(new ZipEntry(file.getName()));
                        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
                        int readLen;
                        byte[] buffer = new byte[1024];
                        while ((readLen = bis.read(buffer)) != -1) {
                            zipOutputStream.write(buffer, 0, readLen);
                        }
                        System.out.println(file.getName());
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }
    public static void main(String[] args) {
        // saveBase64ToFile("Kevin", "resmue.pptx");
        // saveBase64ToFile("Redick", "resmue123.pptx");
        // saveBase64ToFile("Redick", "resmue.pptx");
        String defaultPath = String.format("D:\\%tF\\Redick\\", new Date());
        zipMultipleFile(defaultPath);
    }
}

參考

  1. File to Base64
  2. https://www.mdeditor.tw/pl/gxgA/zh-tw
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