Question

我需要帮助，使用android Studio中的JAVA将pdf文件上传到解析服务器。

我尝试使用以下代码：

private ParseObject uploadPDFToParse(File PDFFile, ParseObject po, String columnName){

    if(PDFFile != null){
        Log.d("EB", "PDFFile is not NULL: " + PDFFile.toString());
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        BufferedInputStream in = null;
        try {
            in = new BufferedInputStream(new FileInputStream(PDFFile));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        int read;
        byte[] buff = new byte[1024];
        try {
            while ((read = in.read(buff)) > 0)
            {
                out.write(buff, 0, read);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            out.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] pdfBytes = out.toByteArray();

        // Create the ParseFile
        ParseFile file = new ParseFile(PDFFile.getName() , pdfBytes);
        po.put(columnName, file);

        // Upload the file into Parse Cloud
        file.saveInBackground();
        po.saveInBackground();
    }
    return po;
}

我收到此错误：

E / Android运行时：致命异常：主要进程：com.jackady.notebytebylev3l，PID：31048 java.lang.RuntimeException：无法交付结果ResultInfo {who = null，request = 0，result = -1，data = Intent { dat = content：//com.mi.android.globalFileexplorer.myprovider/external_files/Download/CourseRegistrationReport （1）.pdf flg = 0x1}}至活动 {com.jackady.notebytebylev3l / com.jackady.notebytebylev3l.uploadPDF}： java.lang.NullPointerException：尝试调用虚拟方法'int 空对象引用上的java.io.BufferedInputStream.read（byte []）' 在android.app.ActivityThread.deliverResults（ActivityThread.java:4419）在android.app.ActivityThread.handleSendResult（ActivityThread.java:4461）在android.app.servertransaction.ActivityResultItem.execute（ActivityResultItem.java:49）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:108）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:68）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1831）在android.os.Handler.dispatchMessage（Handler.java:106）在android.os.Looper.loop（Looper.java:201）在android.app.ActivityThread.main（ActivityThread.java:6806）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:547）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:873）由以下原因引起：java.lang.NullPointerException：尝试在服务器上调用虚拟方法'int java.io.BufferedInputStream.read（byte []）' 空对象引用在com.jackady.notebytebylev3l.uploadPDF.uploadPDFToParse（uploadPDF.java:43）在com.jackady.notebytebylev3l.uploadPDF.onActivityResult（uploadPDF.java:140）在android.app.Activity.dispatchActivityResult（Activity.java:7590）在android.app.ActivityThread.deliverResults（ActivityThread.java:4412）在android.app.ActivityThread.handleSendResult（ActivityThread.java:4461）在android.app.servertransaction.ActivityResultItem.execute（ActivityResultItem.java:49）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:108）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:68）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1831）在android.os.Handler.dispatchMessage（Handler.java:106）在android.os.Looper.loop（Looper.java:201）在android.app.ActivityThread.main（ActivityThread.java:6806）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:547）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:873）

Answer 1

尝试以下代码，让我知道：

private ParseObject uploadPDFToParse(File PDFFile, ParseObject po, String columnName){

    if(PDFFile != null){
        Log.d("EB", "PDFFile is not NULL: " + PDFFile.toString());
        int size = (int) file.length();
        byte[] pdfBytes = new byte[size];

        try {
            BufferedInputStream buf = new BufferedInputStream(new FileInputStream(file));
            buf.read(pdfBytes, 0, pdfBytes.length);
            buf.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // Create the ParseFile
        ParseFile file = new ParseFile(PDFFile.getName() , pdfBytes);
        po.put(columnName, file);

        // Upload the file into Parse Cloud
        file.save();
        po.saveInBackground();
    }
    return po;
}

如何将PDF文件上传到解析服务器？

1 个答案: