从Java中的二进制数据创建pdf [英] create pdf from binary data in java

问题描述

我从Web服务获取此字符串.

" JVBERi0xLjQKMyAwIG9iago8PC9UeXBlIC9QYWdlCi9QYXJlbnQgMSAwIFIKL1Jlc291cmNlcyAyIDAgUgovR3JvdXAgPDwvVHlwZSAvRJJyZLZYYZJYZJYZ1Y

它应该是pdf文件，我尝试了来自Apache的 pdfbox 库，但是它将内容写为pdf内的文本.我已经尝试过使用 ByteArrayInputStream ，但是创建的pdf无效，已损坏，这是我编写的一些代码.

public void escribePdf(String texto, String rutaSalida) throws IOException{

    byte[] biteToRead = texto.getBytes();
    InputStream is = new ByteArrayInputStream(biteToRead );
    DataOutputStream out = new DataOutputStream(new  BufferedOutputStream(new FileOutputStream(new File(rutaSalida))));
    int c;
    while((c = is.read()) != -1) {
        out.writeByte(c);
    }
    out.close();
    is.close();

}

解决方案

这是Base64编码的数据(很可能是UTF-8)，必须在使用前解码.例如:

import sun.misc.BASE64Decoder;

...

BASE64Decoder decoder = new BASE64Decoder();
byte[] decodedBytes = decoder.decodeBuffer(biteToRead);

....

对于Java> = 1.8，请使用:

byte[] decodedBytes = java.util.Base64.getDecoder().decode(biteToRead);

I'm getting this string from a web service.

"JVBERi0xLjQKMyAwIG9iago8PC9UeXBlIC9QYWdlCi9QYXJlbnQgMSAwIFIKL1Jlc291cmNlcyAyIDAgUgovR3JvdXAgPDwvVHlwZSAvR3JvdXAgL1MgL1RyYW5zcGFyZW5jeSAvQ1MgL0RldmljZVJHQj4"

It is supposed to be a pdf file, i tried this library pdfbox from apache, but it writes the content as a text inside the pdf. I've tried with ByteArrayInputStream but the pdf created is not valid, corrupted, this is some of the code i've wrote.

public void escribePdf(String texto, String rutaSalida) throws IOException{

    byte[] biteToRead = texto.getBytes();
    InputStream is = new ByteArrayInputStream(biteToRead );
    DataOutputStream out = new DataOutputStream(new  BufferedOutputStream(new FileOutputStream(new File(rutaSalida))));
    int c;
    while((c = is.read()) != -1) {
        out.writeByte(c);
    }
    out.close();
    is.close();

}

解决方案

That is Base64 encoded (most probably UTF-8) data, you must decode it before using; such as:

import sun.misc.BASE64Decoder;

...

BASE64Decoder decoder = new BASE64Decoder();
byte[] decodedBytes = decoder.decodeBuffer(biteToRead);

....

Edit: For java >= 1.8, use:

byte[] decodedBytes = java.util.Base64.getDecoder().decode(biteToRead);

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