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.

任何人都可以帮助我吗？

Can any one help me?

这就是我转换为字节数组的方式

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 。但它说的是'Bad Format。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

你基本上需要一个辅助方法将流读入内存。这很好用：

You basically need a helper method to read a stream into memory. This works pretty well:

public static byte[] readFully(InputStream stream) throws IOException
{
    byte[] buffer = new byte[8192];
    ByteArrayOutputStream baos = new ByteArrayOutputStream();

    int bytesRead;
    while ((bytesRead = stream.read(buffer)) != -1)
    {
        baos.write(buffer, 0, bytesRead);
    }
    return baos.toByteArray();
}

然后你打电话给：

public static byte[] loadFile(String sourcePath) throws IOException
{
    InputStream inputStream = null;
    try 
    {
        inputStream = new FileInputStream(sourcePath);
        return readFully(inputStream);
    } 
    finally
    {
        if (inputStream != null)
        {
            inputStream.close();
        }
    }
}

不要混合文本和二进制数据 - 它只会导致眼泪。

Don't mix up text and binary data - it only leads to tears.

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