java - 从字节数组创建损坏的 PDF

Question

我试图从Java中的字节数组生成PDf，该数组是通过Web服务返回的，但PDF无法打开。它显示它已损坏，我已附上我的代码。有人请帮助我解决哪里错了吗？

       JSONObject o = new  JSONObject(outjson);
       JSONObject jsonob = o.optJSONObject("PDF details");
       byte[] pdfbyte=jsonob.optString("pdf bytearray").toString().getBytes();
       String str1 = new String(pdfbyte);
        File someFile = new File("C:/Users/acer/Desktop/test1.pdf");
        FileOutputStream fos = new FileOutputStream(someFile);
        byte[] byteData = str1.getBytes();
        byte[] byteData1 = test.getBytes();
        fos.write(pdfbyte);
        fos.flush();
        fos.close();

以下是我来自网络服务的 JSON:

{"PDF details": {
                "id":"121",
                 "pdf bytearray":"[B@62a58cd"
                 }
}

以下是我的 Web 服务代码，它以 json 形式输出字节数组:

public Response getPdf(  )
{
    String flag=null;
    File file = new File("C:/Users/acer/Desktop/Report.pdf");
    FileInputStream fileInputStream;
    byte[] data = null;
    byte[] finalData = null;
    ByteArrayOutputStream byteArrayOutputStream = null;


       fileInputStream = new FileInputStream(file);
       data = new byte[(int)file.length()];
       finalData = new byte[(int)file.length()];
       byteArrayOutputStream = new ByteArrayOutputStream();
       fileInputStream.read(data);
       byteArrayOutputStream.write(data);
       finalData = byteArrayOutputStream.toByteArray();
       fileInputStream.close(); 


    System.out.println(finalData);
    JSONObject jsonObject = new JSONObject();
    JSONObject mainjsonObject = new JSONObject();

    jsonObject.put("id","121");

    jsonObject.put("pdf bytearray",finalData);
    mainjsonObject.put("PDF details",jsonObject);
    flag = "" + mainjsonObject;

    return Response.status(200).entity(flag).build();

}

Answer 1

我在我的网络服务中进行了以下更改:

public Response getPdf(  )
{
            String flag=null;
            File file = new File("C:/Users/acer/Desktop/Report.pdf");

            FileInputStream fileInputStreamReader = new FileInputStream(file);

            byte[] bytes = new byte[(int)file.length()];
            fileInputStreamReader.read(bytes);
            String encodedBase64 = new String(Base64.encodeBase64(bytes));

             JSONObject jsonObject = new JSONObject();
             JSONObject mainjsonObject = new JSONObject();

             jsonObject.put("id","121");

             jsonObject.put("pdf bytearray",encodedBase64);
             mainjsonObject.put("PDF details",jsonObject);
             flag = "" + mainjsonObject;


    return Response.status(200).entity(flag).build();
}

我的客户:

     String encodedBase64=jsonob.optString("pdf bytearray");

     byte[] decodedBytes = Base64.decodeBase64(encodedBase64);
     System.out.println("decbyte   "+decodedBytes);
     File someFile = new File("C:/Users/acer/Desktop/test.pdf");
     OutputStream fos = new FileOutputStream(someFile);
     fos.write(decodedBytes);
     fos.flush();
     fos.close();