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Upload Pdf File as Binary File in Java

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Use JavaScript to upload binary files such as PDF and Excel to ABAP server and parse them

JerryWang_ Wang Zixi 2021-12-06 xi:49:02

This is a Jerry 2022 In the first 71 An commodity , It's also the official account of Wang Zixi 348 Original articles .

Jerry I published an article before Don't use any framework , Handwritten pure JavaScript Upload local files to ABAP The server , Subsequently that, many friends left messages , The questions raised tin exist summarized into the post-obit two categories ：

(1) Customer laissez passer multipart/form-data Data sent in format ,ABAP Except like Jerry This paper adopts string parsing, which is a cumbersome way to deal with external , Is there any other fashion ？

(2) Can I upload binary files, such as Excel To ABAP And analyze ？


This article will reply these 2 questions .

Use JavaScript adopt multipart/form-data Format transport PDF and Excel File to ABAP The server

Near multipart/form-data Detailed clarification of the format , Reference resources Mozilla Develop communities and W3 Org Documents ：

  • https://programmer.mozilla.org...
  • https://www.w3.org/html/wg/sp...

I'll make some modifications on the ground of the previous example , stay Form The 2 types used in are file Of input label , Upload separately PDF and Excel file ：


Local for testing PDF file ：PDF.pdf, The size is 30129 byte .


The contents are as follows ：

Local for testing Excel file ：Exam.xlsx, The contents are every bit follows ：

Click on HTML Folio upload file hyperlink , stay Chrome Developer tools observe HTTP POST The requested load , Contains PDF and Excel Two input Command contains a binary stream (stream):

Click on view source, see multipart/course-data Data details ：

We can nevertheless Chrome The upload was observed in the developer tool PDF and Excel And Content-Blazon I.e. certificate blazon . Different from the previous example of uploading a text file , Y'all can't see the binary contents of the two files here —— These binary contents tin be found in ABAP Observed in the server-side debugger .


To upload PDF File as an example , stay ABAP Received by the server form-data data , As shown in the effigy below , The dark-green highlighted area is the higher up figure Chrome The file name that tin can be observed in the developer tool PDF.pdf And file types awarding/pdf, and %PDF-1.iv# At the beginning , Namely PDF The binary content of the file .


Accurately speaking ,PDF The format is a mixture of text and binary streams . Open with text editor PDF.pdf, You can run into that the file header contains the file metadata described by text characters , For example, the creation and modification time of the file , The name of the tool that created the file, then on , The second one-half is the binary stream .

In that location are already many open source tools, such equally JavaScript Libraries tin exist used to generate and parse PDF The file , Interested friends can search in the search engine Jerry These articles ：

  • Use ABAP and JavaScript Code generation PDF Several means to file
  • Use JavaScript Relieve the current folio as PDF, Support the saving of pictures and text
  • PDF How to turn a certificate into markdown Format

For uploading to ABAP Server's PDF File name of the file , We still analyze in the same way as the previous commodity , Extract... From the cord in the red rectangle in the figure below .

For the green highlighted in the above figure PDF Binary data of ,CL_HTTP_REQUEST Corresponding methods are provided to extract . The key code is shown in the figure below ：


When ABAP The format of client data received by the server is multipart/form-data when , call CL_HTTP_REQUEST Of num_multiparts Method tin can get parts The number of , Reuse get_multipart Method , Pass in each office The index of , You tin can go this part An case of .

Call the... Of the reference get_content_type and get_data Method , You can parse the blazon of uploaded file ( such as pdf The format corresponds to awarding/pdf) And binary content .

Called at this point SAP CRM Attachment creation API Iii parameters of ： file name , The file blazon and binary contents of the file are ready , phone call API You lot tin can upload PDF and Excel data , Create to become SAP CRM Attachments to the sales order .

Create good PDF and Excel Fastened at SAP CRM The system displays the following ：

Open both attachments , Brand sure that later on uploading , Its content is completely consistent with the local file ：

How to employ ABAP Parse the uploaded Excel file

This topic , Actually Jerry 2022 Manufactures from Use ABAP functioning Excel Several ways to Has been systematically introduced .

We are ABAP Observed in the debugger , The local extension is xlsx Of Excel file , Upload to ABAP Server time , Its content-type by ：
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

What is? openxmlformats？ The following is a specific case to illustrate .

With my local Excel File as an example , Modify the extension from xlsx Change to cipher, Then decompress ：

Discover out xlsx The file is really a compressed package , After unzipping, a folder is generated , It contains several subfolders and files as shown in the figure below .

Upper figure Excel The file has a name Sheet1 The content folio of ,A1 The value is ABAP,B1 The value is Coffee, This information is maintained in the extracted worksheets Subfolders of the binder sheet1.xml Inside ：

Highlighted above XML c Nodes represent Prison cell,r="A1" and r="B1", On behalf of these ii cell Where Row ID,c Child nodes of v Contains Jail cell The specific value of .

Information technology'southward not hard to notice out ,sheet1.xml There is no direct reference to ABAP and Coffee Including the literal value of the cord , And just store its index ,0 and 1. done Java Friends of development , This design tin be compared to Java String constant puddle .

At that place is another file in the extracted binder sharedStrings.xml, seeing the proper name of a thing one thinks of its function , Maintained Excel worksheets All strings that appear in , Used in sheets To share . Each individual sheet xml The file only maintains the index of the cord used , To reduce the Excel The size of the document .

therefore , As long as I'm familiar TEST.xlsx Rename information technology to Exam.null And the purpose of each file generated later on decompression , namely Open up XML Formats Protocol specification for , You tin can use whatsoever high-level programming language to parse Excel file .

Tin can be in WikiPedia Found in Open XML Formats The function of each file divers by the protocol ：

https://en.wikipedia.org/wiki...

SAP CRM A tool grade is provided , be based on Open XML Formats analysis Excel The contents of the document ：cl_xlsx_document.

Just put the Excel The binary content of the file is passed in , The tool class returns a Excel References to documents , According to the various Get Method , You lot can access Excel The document consists of Open XML Formats The content of each part of the protocol definition .

The core logic is shown in the figure below , The code is self describing , No more details here .

Of course , Open source projection abap2xlsx Some other option ：

https://github.com/sapmentors...

as for SAP Fiori Awarding passed SAP Gateway Upload the technical details of the attachment ,Jerry In the future, nosotros volition introduce .

This article involves the front and back-terminate complete source code , Here, please link Download .

Thank you for reading .

Jerry Of ABAP projection

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more Jerry The original article of , All in ：" Wang Zixi ":

saucedoserow1952.blogspot.com

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