PDF 到字节数组，反之亦然 [英] PDF to byte array and vice versa

问题描述

我需要将 pdf 转换为字节数组，反之亦然.

I need to convert pdf to byte array and vice versa.

有人可以帮我吗?

这就是我如何转换为字节数组

This is how I am converting to byte array

public static byte[] convertDocToByteArray(String sourcePath) {

    byte[] byteArray=null;
    try {
        InputStream inputStream = new FileInputStream(sourcePath);


        String inputStreamToString = inputStream.toString();
        byteArray = inputStreamToString.getBytes();

        inputStream.close();
    } catch (FileNotFoundException e) {
        System.out.println("File Not found"+e);
    } catch (IOException e) {
                System.out.println("IO Ex"+e);
    }
    return byteArray;
}

如果我使用以下代码将其转换回文档，则会创建 pdf.但它说 '格式错误.不是pdf'.

If I use following code to convert it back to document, pdf is getting created. But it's saying 'Bad Format. Not a pdf'.

public static void convertByteArrayToDoc(byte[] b) {          

    OutputStream out;
    try {       
        out = new FileOutputStream("D:/ABC_XYZ/1.pdf");
        out.close();
        System.out.println("write success");
    }catch (Exception e) {
        System.out.println(e);
    }

推荐答案

Java 7 引入了 Files.readAllBytes()，可以将 PDF 读入 byte[]像这样:

Java 7 introduced Files.readAllBytes(), which can read a PDF into a byte[] like so:

import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.Files;

Path pdfPath = Paths.get("/path/to/file.pdf");
byte[] pdf = Files.readAllBytes(pdfPath);

感谢 Farooque 指出:这适用于阅读任何类型的文件，而不仅仅是 PDF.所有文件最终都只是一堆字节，因此可以读入byte[].

Thanks Farooque for pointing out: this will work for reading any kind of file, not just PDFs. All files are ultimately just a bunch of bytes, and as such can be read into a byte[].

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