The Java OCR SDK supports the Invoice API.

Using the sample below, we are going to illustrate how to extract the data that we want using the OCR SDK.
Invoice sample

Quick-Start

import com.mindee.MindeeClient;
import com.mindee.input.LocalInputSource;
import com.mindee.parsing.common.PredictResponse;
import com.mindee.product.invoice.InvoiceV4;
import java.io.File;
import java.io.IOException;

public class SimpleMindeeClient {

  public static void main(String[] args) throws IOException {
    String apiKey = "my-api-key";
    String filePath = "/path/to/the/file.ext";

    // Init a new client
    MindeeClient mindeeClient = new MindeeClient(apiKey);

    // Load a file from disk
    LocalInputSource inputSource = new LocalInputSource(filePath);

    // Parse the file
    PredictResponse<InvoiceV4> response = mindeeClient.parse(
        InvoiceV4.class,
        inputSource
    );

    // Print a summary of the response
    System.out.println(response.toString());

    // Print a summary of the predictions
//  System.out.println(response.getDocument().toString());

    // Print the document-level predictions
//    System.out.println(response.getDocument().getInference().getPrediction().toString());

    // Print the page-level predictions
//    response.getDocument().getInference().getPages().forEach(
//        page -> System.out.println(page.toString())
//    );
  }

}

You can also call this product asynchronously:

import com.mindee.MindeeClient;
import com.mindee.input.LocalInputSource;
import com.mindee.parsing.common.AsyncPredictResponse;
import com.mindee.product.invoice.InvoiceV4;
import java.io.File;
import java.io.IOException;

public class SimpleMindeeClient {

  public static void main(String[] args) throws IOException, InterruptedException {
    String apiKey = "my-api-key";
    String filePath = "/path/to/the/file.ext";

    // Init a new client
    MindeeClient mindeeClient = new MindeeClient(apiKey);

    // Load a file from disk
    LocalInputSource inputSource = new LocalInputSource(new File(filePath));

    // Parse the file asynchronously
    AsyncPredictResponse<InvoiceV4> response = mindeeClient.enqueueAndParse(
        InvoiceV4.class,
        inputSource
    );

    // Print a summary of the response
    System.out.println(response.toString());

    // Print a summary of the predictions
//  System.out.println(response.getDocumentObj().toString());

    // Print the document-level predictions
//    System.out.println(response.getDocumentObj().getInference().getPrediction().toString());

    // Print the page-level predictions
//    response.getDocumentObj().getInference().getPages().forEach(
//        page -> System.out.println(page.toString())
//    );
  }

}

Output (RST):

########
Document
########
:Mindee ID: a67b70ea-4b1e-4eac-ae75-dda47a7064ae
:Filename: default_sample.jpg

Inference
#########
:Product: mindee/invoices v4.9
:Rotation applied: Yes

Prediction
==========
:Locale: en-CA; en; CA; CAD;
:Invoice Number: 14
:Purchase Order Number: AD29094
:Reference Numbers: AD29094
:Purchase Date: 2018-09-25
:Due Date: 2011-12-01
:Payment Date: 2011-12-01
:Total Net: 2145.00
:Total Amount: 2608.20
:Total Tax: 193.20
:Taxes:
  +---------------+--------+----------+---------------+
  | Base          | Code   | Rate (%) | Amount        |
  +===============+========+==========+===============+
  |               |        | 8.00     | 193.20        |
  +---------------+--------+----------+---------------+
:Supplier Payment Details:
:Supplier Name: TURNPIKE DESIGNS
:Supplier Company Registrations:
:Supplier Address: 156 University Ave, Toronto ON, Canada, M5H 2H7
:Supplier Phone Number: 4165551212
:Supplier Website:
:Supplier Email: [email protected]
:Customer Name: JIRO DOI
:Customer Company Registrations:
:Customer Address: 1954 Bloor Street West Toronto, ON, M6P 3K9 Canada
:Customer ID:
:Shipping Address:
:Billing Address: 1954 Bloor Street West Toronto, ON, M6P 3K9 Canada
:Document Type: INVOICE
:Line Items:
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | Description                          | Product code | Quantity | Tax Amount | Tax Rate (%) | Total Amount | Unit of measure | Unit Price |
  +======================================+==============+==========+============+==============+==============+=================+============+
  | Platinum web hosting package Down... |              | 1.00     |            |              | 65.00        |                 | 65.00      |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | 2 page website design Includes ba... |              | 3.00     |            |              | 2100.00      |                 | 2100.00    |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | Mobile designs Includes responsiv... |              | 1.00     |            |              | 250.00       | 1               | 250.00     |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+

Page Predictions
================

Page 0
------
:Locale: en-CA; en; CA; CAD;
:Invoice Number: 14
:Purchase Order Number: AD29094
:Reference Numbers: AD29094
:Purchase Date: 2018-09-25
:Due Date: 2011-12-01
:Payment Date: 2011-12-01
:Total Net: 2145.00
:Total Amount: 2608.20
:Total Tax: 193.20
:Taxes:
  +---------------+--------+----------+---------------+
  | Base          | Code   | Rate (%) | Amount        |
  +===============+========+==========+===============+
  |               |        | 8.00     | 193.20        |
  +---------------+--------+----------+---------------+
:Supplier Payment Details:
:Supplier Name: TURNPIKE DESIGNS
:Supplier Company Registrations:
:Supplier Address: 156 University Ave, Toronto ON, Canada, M5H 2H7
:Supplier Phone Number: 4165551212
:Supplier Website:
:Supplier Email: [email protected]
:Customer Name: JIRO DOI
:Customer Company Registrations:
:Customer Address: 1954 Bloor Street West Toronto, ON, M6P 3K9 Canada
:Customer ID:
:Shipping Address:
:Billing Address: 1954 Bloor Street West Toronto, ON, M6P 3K9 Canada
:Document Type: INVOICE
:Line Items:
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | Description                          | Product code | Quantity | Tax Amount | Tax Rate (%) | Total Amount | Unit of measure | Unit Price |
  +======================================+==============+==========+============+==============+==============+=================+============+
  | Platinum web hosting package Down... |              | 1.00     |            |              | 65.00        |                 | 65.00      |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | 2 page website design Includes ba... |              | 3.00     |            |              | 2100.00      |                 | 2100.00    |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+
  | Mobile designs Includes responsiv... |              | 1.00     |            |              | 250.00       | 1               | 250.00     |
  +--------------------------------------+--------------+----------+------------+--------------+--------------+-----------------+------------+

Field Types

Standard Fields

These fields are generic and used in several products.

BaseField

Each prediction object contains a set of fields that inherit from the generic BaseField class.
A typical BaseField object will have the following attributes:

confidence (Double): the confidence score of the field prediction.
boundingBox (Polygon): contains exactly 4 relative vertices (points) coordinates of a right rectangle containing the field in the document.
polygon (Polygon): contains the relative vertices coordinates (polygon extends List<Point>) of a polygon containing the field in the image.
pageId (Integer): the ID of the page, always null when at document-level.

Note: A Point simply refers to a List of Double.

Aside from the previous attributes, all basic fields have access to a custom toString method that can be used to print their value as a string.

AmountField

An amount field AmountField extends BaseField, but also implements:

value (Double): corresponds to the field value. Can be null if no value was extracted.

ClassificationField

The classification field ClassificationField extends BaseField, but also implements:

value (strong): corresponds to the field value.
confidence (double): the confidence score of the field prediction.

Note: a classification field's value is always a String`.

CompanyRegistrationField

Aside from the basic BaseField attributes, the company registration field CompanyRegistrationField also implements the following:

type (String): the type of company.
value (String): corresponds to the field value.
toTableLine(): a method that formats the data to fit in a .rst display.

StringField

The text field StringField extends BaseField, but also implements:

value (String): corresponds to the field value.
rawValue (String): corresponds to the raw value as it appears on the document.

DateField

The date field DateField extends BaseField, but also implements:

value (LocalDate): an accessible representation of the value as a Java object. Can be null.

LocaleField

The locale field LocaleField extends BaseField, but also implements:

value (LocalDate): an accessible representation of the value as a Java object. Can be null.
language (String): ISO 639-1 language code (e.g.: en for English). Can be null.
country (String): ISO 3166-1 alpha-2 or ISO 3166-1 alpha-3 code for countries (e.g.: GRB or GB for "Great Britain"). Can be null.
currency (String): ISO 4217 code for currencies (e.g.: USD for "US Dollars"). Can be null.

Taxes

TaxField

Aside from the basic BaseField attributes, the tax field TaxField also implements the following:

rate (Double): the tax rate applied to an item expressed as a percentage. Can be null.
code (String): tax code (or equivalent, depending on the origin of the document).
base (Double): base amount used for the tax. Can be null.
value (Double): the value of the tax. Can be null.

Note: currently TaxField is not used on its own, and is accessed through a parent Taxes object, a list-like structure.

Taxes (List)

The Taxes field represents a List of TaxField objects. As it is the representation of several objects, it has access to a custom toString method that can render a TaxField object as a table line.

Specific Fields

Fields which are specific to this product; they are not used in any other product.

Line Items Field

List of line item details.

A InvoiceV4LineItem implements the following attributes:

description (String): The item description.
productCode (String): The product code referring to the item.
quantity (Double): The item quantity
taxAmount (Double): The item tax amount.
taxRate (Double): The item tax rate in percentage.
totalAmount (Double): The item total amount.
unitMeasure (String): The item unit of measure.
unitPrice (Double): The item unit price.

Attributes

The following fields are extracted for Invoice V4:

Billing Address

billingAddress: The customer's address used for billing.

System.out.println(result.getDocument().getInference().getPrediction().getBillingAddress().value);

Customer Address

customerAddress: The address of the customer.

System.out.println(result.getDocument().getInference().getPrediction().getCustomerAddress().value);

Customer Company Registrations

customerCompanyRegistrations: List of company registrations associated to the customer.

for (customerCompanyRegistrationsElem : result.getDocument().getInference().getPrediction().getCustomerCompanyRegistrations())
{
    System.out.println(customerCompanyRegistrationsElem.value);
}

Customer ID

customerId: The customer account number or identifier from the supplier.

System.out.println(result.getDocument().getInference().getPrediction().getCustomerId().value);

Customer Name

customerName: The name of the customer or client.

System.out.println(result.getDocument().getInference().getPrediction().getCustomerName().value);

Purchase Date

date: The date the purchase was made.

System.out.println(result.getDocument().getInference().getPrediction().getDate().value);

Document Type

documentType: One of: 'INVOICE', 'CREDIT NOTE'.

Possible values include:

INVOICE
CREDIT NOTE

System.out.println(result.getDocument().getInference().getPrediction().getDocumentType().value);

Due Date

dueDate: The date on which the payment is due.

System.out.println(result.getDocument().getInference().getPrediction().getDueDate().value);

Invoice Number

invoiceNumber: The invoice number or identifier.

System.out.println(result.getDocument().getInference().getPrediction().getInvoiceNumber().value);

Line Items

lineItems(List<InvoiceV4LineItem>): List of line item details.

for (lineItemsElem : result.getDocument().getInference().getPrediction().getLineItems())
{
    System.out.println(lineItemsElem.value);
}

Locale

locale: The locale detected on the document.

System.out.println(result.getDocument().getInference().getPrediction().getLocale().value);

Payment Date

paymentDate: The date on which the payment is due/ was full-filled.

System.out.println(result.getDocument().getInference().getPrediction().getPaymentDate().value);

Purchase Order Number

poNumber: The purchase order number.

System.out.println(result.getDocument().getInference().getPrediction().getPoNumber().value);

Reference Numbers

referenceNumbers: List of Reference numbers, including PO number.

for (referenceNumbersElem : result.getDocument().getInference().getPrediction().getReferenceNumbers())
{
    System.out.println(referenceNumbersElem.value);
}

Shipping Address

shippingAddress: Customer's delivery address.

System.out.println(result.getDocument().getInference().getPrediction().getShippingAddress().value);

Supplier Address

supplierAddress: The address of the supplier or merchant.

System.out.println(result.getDocument().getInference().getPrediction().getSupplierAddress().value);

Supplier Company Registrations

supplierCompanyRegistrations: List of company registrations associated to the supplier.

for (supplierCompanyRegistrationsElem : result.getDocument().getInference().getPrediction().getSupplierCompanyRegistrations())
{
    System.out.println(supplierCompanyRegistrationsElem.value);
}

Supplier Email

supplierEmail: The email of the supplier or merchant.

System.out.println(result.getDocument().getInference().getPrediction().getSupplierEmail().value);

Supplier Name

supplierName: The name of the supplier or merchant.

System.out.println(result.getDocument().getInference().getPrediction().getSupplierName().value);

Supplier Payment Details

supplierPaymentDetails: List of payment details associated to the supplier.

for (supplierPaymentDetailsElem : result.getDocument().getInference().getPrediction().getSupplierPaymentDetails())
{
    System.out.println(supplierPaymentDetailsElemvalue);
    System.out.println(supplierPaymentDetailsElem.rate);
    System.out.println(supplierPaymentDetailsElem.code);
    System.out.println(supplierPaymentDetailsElem.base);
}

Supplier Phone Number

supplierPhoneNumber: The phone number of the supplier or merchant.

System.out.println(result.getDocument().getInference().getPrediction().getSupplierPhoneNumber().value);

Supplier Website

supplierWebsite: The website URL of the supplier or merchant.

System.out.println(result.getDocument().getInference().getPrediction().getSupplierWebsite().value);

Taxes

taxes: List of tax line details.

for (taxesElem : result.getDocument().getInference().getPrediction().getTaxes())
{
    System.out.println(taxesElem.value);
}

Total Amount

totalAmount: The total amount paid: includes taxes, tips, fees, and other charges.

System.out.println(result.getDocument().getInference().getPrediction().getTotalAmount().value);

Total Net

totalNet: The net amount paid: does not include taxes, fees, and discounts.

System.out.println(result.getDocument().getInference().getPrediction().getTotalNet().value);

Total Tax

totalTax: The total tax: includes all the taxes paid for this invoice.

System.out.println(result.getDocument().getInference().getPrediction().getTotalTax().value);

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