使用 GroupDocs.Parser 在 Java 中提取 PDF 表單資料

在本教學中，你將了解 如何使用 GroupDocs.Parser for Java 從 PDF 文件中提取表單資料。無論你需要讀取 PDF 表單欄位、提取 PDF 中的圖像，或自動化 PDF 資料輸入，以下一步一步的指南都會向你展示如何高效且可靠地完成。

快速解答

  • 什麼函式庫可提取 PDF 表單資料？ GroupDocs.Parser for Java
  • 我可以讀取 PDF 表單欄位和圖像嗎？ Yes – both text fields and embedded images are supported
  • 我需要授權嗎？ A free trial works for evaluation; a commercial license is required for production
  • 需要哪個 Java 版本？ Java 8 or later
  • 是否支援平行處理？ Yes, you can parse multiple PDFs concurrently for high‑throughput scenarios

什麼是提取 PDF 表單資料？

提取 PDF 表單資料是指以程式方式讀取 PDF 表單中互動欄位（文字方塊、核取方塊、下拉選單等）所輸入的值。這讓你能將資料從靜態文件搬移至資料庫、CRM 系統或任何後續流程，而無需手動抄寫。

為什麼使用 GroupDocs.Parser 來提取 PDF 表單資料？

  • 高精度： Handles complex layouts and preserves field names.
  • 廣泛格式支援： Works with PDFs, Word, Excel, and more.
  • 簡易 API： Minimal code required to get field values.
  • 效能導向： Supports streaming and selective parsing to keep memory usage low.

前置條件

  • Java Development Kit (JDK)： Java 8 or later
  • Maven： For dependency management and building the project
  • Basic Java knowledge： Familiarity with classes, methods, and OOP concepts

設定 GroupDocs.Parser for Java

Integrate GroupDocs.Parser into your project using Maven or by downloading the library directly.

Maven 整合

Add the repository and dependency to your pom.xml file:

<repositories>
    <repository>
        <id>repository.groupdocs.com</id>
        <name>GroupDocs Repository</name>
        <url>https://releases.groupdocs.com/parser/java/</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>com.groupdocs</groupId>
        <artifactId>groupdocs-parser</artifactId>
        <version>25.5</version>
    </dependency>
</dependencies>

直接下載

Alternatively, download the latest version from GroupDocs.Parser for Java releases.

取得授權

  • Free Trial： Obtain a temporary license to test GroupDocs.Parser features.
  • Purchase： Acquire a full license for commercial use.

Once the library is available, you can create a Parser instance to work with PDF forms:

import com.groupdocs.parser.Parser;

public class PdfFormExtractor {
    public static void main(String[] args) {
        try (Parser parser = new Parser("YOUR_DOCUMENT_DIRECTORY/SampleCarWashPdf.pdf")) {
            // Parse form fields from the document here...
        }
    }
}

如何提取 PDF 表單資料

步驟 1：解析表單欄位

Start by creating a Parser object and calling parseForm() to retrieve the form structure:

import com.groupdocs.parser.Parser;
import com.groupdocs.parser.data.DocumentData;

public class ExtractDataFromPdfFormsFeature {
    public static void run() {
        String filePath = "YOUR_DOCUMENT_DIRECTORY/SampleCarWashPdf.pdf";

        try (Parser parser = new Parser(filePath)) {
            DocumentData data = parser.parseForm();
            
            if (data == null) {
                System.out.println("Form extraction isn't supported.");
                return;
            }
            // Continue to extract field values...
        }
    }
}

步驟 2：提取欄位值

Use the field name to pull the text content from each FieldData object. This method also shows how to read pdf form fields safely:

import com.groupdocs.parser.data.FieldData;
import com.groupdocs.parser.data.PageTextArea;

private static String getFieldText(DocumentData data, String fieldName) {
    FieldData fieldData = data.getFieldsByName(fieldName).get(0);
    
    return fieldData != null && fieldData.getPageArea() instanceof PageTextArea
            ? ((PageTextArea) fieldData.getPageArea()).getText()
            : null;
}

步驟 3：建立記錄物件

Store the extracted values in a structured record so they can be persisted or sent to other systems:

static class PreliminaryRecord {
    public String Name;
    public String Model;
    public String Time;
    public String Description;
}

// Extracted values are then assigned to the record fields:
PreliminaryRecord rec = new PreliminaryRecord();
rec.Name = getFieldText(data, "Name");
rec.Model = getFieldText(data, "Model");
rec.Time = getFieldText(data, "Time");
rec.Description = getFieldText(data, "Description");

建立記錄物件以儲存提取的資料

A well‑defined object makes it easy to integrate the extracted information with databases, APIs, or CRM platforms.

概觀

Creating a structured object helps manage and integrate form data into larger systems.

實作步驟

  1. Initialize the Record Object： Set up an instance of PreliminaryRecord.
  2. Populate with Extracted Values： Use the helper method above to fill the object.
public class CreateRecordObjectFeature {
    public static void createAndPopulateRecord() {
        PreliminaryRecord rec = new PreliminaryRecord();
        
        // Simulated extracted values for demonstration:
        rec.Name = "John Doe";
        rec.Model = "Tesla Model S";
        rec.Time = "10:00 AM";
        rec.Description = "Routine service check";
        
        // Now, the record object 'rec' can be used further.
    }
}

實務應用

  • Automated Data Entry： Pull customer or order details from PDF forms directly into your backend.
  • Invoice Processing： Extract invoice numbers, dates, and totals to speed up reconciliation.
  • Survey Responses Analysis： Gather answers from PDF questionnaires for reporting.
  • Medical Records Management： Pull patient information for electronic health record (EHR) systems.
  • Integration with CRM Systems： Populate leads and contacts in real time from filled PDFs.

效能考量

  • Memory Management： Use try‑with‑resources (as shown) to ensure Parser instances are closed promptly.
  • Selective Parsing： Only request the fields you need to reduce CPU overhead.
  • Thread Safety： When processing many PDFs, run each Parser instance on its own thread; the library is thread‑safe when used this way.

常見問題

Q: Can I extract images from pdf using GroupDocs.Parser?
A: Yes, GroupDocs.Parser supports image extraction alongside text fields.

Q: How do I handle encrypted PDFs?
A: Provide the password when constructing the Parser instance; the library will decrypt the document automatically.

Q: Which other file formats are supported besides PDF?
A: The API also parses Word documents, Excel spreadsheets, PowerPoint presentations, and many more.

Q: What is the best way to process large volumes of PDFs?
A: Combine parallel streams with a thread‑pool executor to parse multiple files concurrently while respecting memory limits.

Q: Is a commercial license required for production use?
A: Yes, a full license is needed for production deployments; a free trial is available for evaluation.

結論

You now have a complete, production‑ready approach to extract pdf form data with GroupDocs.Parser in Java. By parsing form fields, creating structured record objects, and handling performance considerations, you can automate data entry, integrate with downstream systems, and unlock the hidden value inside your PDF forms. For deeper details, explore the official documentation.

最後更新： 2026-01-01
測試版本： GroupDocs.Parser 25.5
作者： GroupDocs