beanio-usage

Quick example of how to unmarshal a plain text file delimited by size using the Beanio library for Java.

Steps

- Create a POJO file with the required fields
- Anotate the class with '@Record'
- Define the field start position and lenght with '@Field' annotation
- With StreamFactory, define a reader with the annotated POJO
    - BeanIo supports multiple reader formats. The format 'fixedlenght' is used here.
- It is possible to skip rows with 'BeanReader.skip(<numberOfRows>)' method

Device.java

@Record
public class Device {

    @Field(at = 0, length = 15)
    private String macAddress;

    @Field(at = 15, length = 15)
    private String ipAddress;

    @Field(at = 31, length = 9)
    private String hostInterface;
    ...

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Parser.java

    public Parser(){
        factory = StreamFactory.newInstance();
        factory.define(new StreamBuilder("devices")
                     .format("fixedlength")
                     .addRecord(Device.class)
        );
     }

    public void readFileUsingBeanIo(File file, int skipHeaders) {
        BeanReader in = factory.createReader("devices", file);
        in.skip(skipHeaders);
        mapRows(in);
    }

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Test Results

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Reference

http://beanio.org/2.1/docs/reference/index.html