The Java OCR SDK supports the Proof of Address API.

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

Quick-Start

import com.mindee.MindeeClient;
import com.mindee.input.LocalInputSource;
import com.mindee.parsing.common.PredictResponse;
import com.mindee.product.proofofaddress.ProofOfAddressV1;
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<ProofOfAddressV1> response = mindeeClient.parse(
        ProofOfAddressV1.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())
//    );
  }

}

Output (RST):

########
Document
########
:Mindee ID: 5d2361e9-405e-4fc1-8531-f92a3aef0c38
:Filename: default_sample.jpg

Inference
#########
:Product: mindee/proof_of_address v1.1
:Rotation applied: Yes

Prediction
==========
:Locale: en; en; USD;
:Issuer Name: PPL ELECTRIC UTILITIES
:Issuer Company Registrations:
:Issuer Address: 2 NORTH 9TH STREET CPC-GENN1 ALLENTOWN.PA 18101-1175
:Recipient Name:
:Recipient Company Registrations:
:Recipient Address: 123 MAIN ST ANYTOWN,PA 18062
:Dates: 2011-07-27
        2011-07-06
        2011-08-03
        2011-07-27
        2011-06-01
        2011-07-01
        2010-07-01
        2010-08-01
        2011-07-01
        2009-08-01
        2010-07-01
        2011-07-27
:Date of Issue: 2011-07-27

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

Page 0
------
:Locale: en; en; USD;
:Issuer Name: PPL ELECTRIC UTILITIES
:Issuer Company Registrations:
:Issuer Address: 2 NORTH 9TH STREET CPC-GENN1 ALLENTOWN.PA 18101-1175
:Recipient Name:
:Recipient Company Registrations:
:Recipient Address: 123 MAIN ST ANYTOWN,PA 18062
:Dates: 2011-07-27
        2011-07-06
        2011-08-03
        2011-07-27
        2011-06-01
        2011-07-01
        2010-07-01
        2010-08-01
        2011-07-01
        2009-08-01
        2010-07-01
        2011-07-27
:Date of Issue: 2011-07-27

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.

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.

Attributes

The following fields are extracted for Proof of Address V1:

Date of Issue

date: The date the document was issued.

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

Dates

dates: List of dates found on the document.

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

Issuer Address

issuerAddress: The address of the document's issuer.

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

Issuer Company Registrations

issuerCompanyRegistration: List of company registrations found for the issuer.

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

Issuer Name

issuerName: The name of the person or company issuing the document.

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

Locale

locale: The locale detected on the document.

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

Recipient Address

recipientAddress: The address of the recipient.

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

Recipient Company Registrations

recipientCompanyRegistration: List of company registrations found for the recipient.

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

Recipient Name

recipientName: The name of the person or company receiving the document.

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

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