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User Guide for Java SDK

In this guide, you will learn step by step on how to build a barcode reading application with Dynamsoft Barcode Reader SDK using Java.

Requirements

Operating systems:
- Windows 7, 8, 10
- Windows Server 2003, 2008, 2008 R2, 2012
- Linux x64 (Ubuntu 14.04.4+ LTS, Debian 8+, etc.)
- macOS x64 10.12+
Developing Environment:
- JDK 1.7 and above

Installation

If you haven’t downloaded the SDK yet, download the Java Package now from Dynamsoft website and unpack the package into the directory of your choice.

For this tutorial, we unpack it to [INSTALLATION FOLDER], change it to your unpacking path for the following content.

Build Your First Application

Let’s start by creating a console application which demonstrates how to use the minimum code to read barcodes from an image file.

You can download the entire source code and compiled program from Here.

Create a New Project

Open Eclipse. Go to File > New > Project, create a new Java project DBRJavaSample.
Add a new Class named DBRJavaSample into the project.

Add the Library Reference

Right click on Project -> Properties > Java Build Path > Libraries > Add external JARs, Browse to [INSTALLATION FOLDER]\lib and Select dynamsoft-barcodereader-{version number}.jar.
Import the package in the file DBRJavaSample.java
```
import com.dynamsoft.dbr.*;
```
Initialize a Barcode Reader Instance

Create an instance of Dynamsoft Barcode Reader.

 BarcodeReader reader = new BarcodeReader()

Initialize the license key.
```
 reader.initLicense("<insert DBR license key here>");
```
Please replace <insert DBR license key here> with a valid DBR licensekey. There are two ways to obtain one:
- Search initLicense and find the license from [INSTALLATION FOLDER]/samples/BarcodeReaderDemo/src/com/dynamsoft/demo/BarcodeReaderDemo.java.
- Request a trial license from Customer Portal.

Configure the Barcode Scanning Behavior

Set barcode format and count to read.
```
PublicRuntimeSettings runtimeSettings = reader.getRuntimeSettings();
runtimeSettings.barcodeFormatIds = EnumBarcodeFormat.BF_ALL;
runtimeSettings.barcodeFormatIds_2 = EnumBarcodeFormat_2.BF2_POSTALCODE | EnumBarcodeFormat_2.BF2_DOTCODE;
runtimeSettings.expectedBarcodesCount = 32;
reader.updateRuntimeSettings(runtimeSettings);
```
The barcode formats to enable is highly application-specific. We recommend that you only enable the barcode formats your application requires. Check out Barcode Format Enumeration for full supported barcode formats.

If you know exactly the barcode count you want to read, specify expectedBarcodesCount to speed up the process and improve the accuracy.

Decode and Output Results

Decode barcodes from an image file.

Get and output barcode results.

TextResult[] results;
try
{
    results = reader.decodeFile("[INSTALLATION FOLDER]/images/AllSupportedBarcodeTypes.png", "");
    System.out.println("Total barcodes found: " + results.length);
    for (int iIndex = 0; iIndex < results.length; ++iIndex)
    {
        System.out.println("Barcode " + (iIndex + 1));
        if (results[iIndex].barcodeFormat != 0)
        {
            System.out.println("    Barcode Format: " + results[iIndex].barcodeFormatString);
        }
        else
        {
            System.out.println("    Barcode Format: " + results[iIndex].barcodeFormatString_2);
        }
        System.out.println("    Barcode Text: " + results[iIndex].barcodeText);
    }     
}
catch (BarcodeReaderException exp)
{
    System.out.println(exp.getMessage());
}

For the error handling mechanism, the SDK throws BarcodeReaderException for each function. You should add codes for exception handling based on your needs.

The SDK returns multiple barcode information, including barcode count, barcode format, barcode text, location, barcode raw data, etc. Check out TextResult for full supported result data.

Release Resource

Destroy the instance to release all resources.
```
 reader.destroy();
```

Note:
Please change all [INSTALLATION FOLDER] in above code snippet to your unpacking path.

Build and Run the Project

Right click the project， click Run As > Java Application.