我尝试使用beanIo到json解析一个固定长度的平面文件
代码：

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Map;

import org.beanio.BeanIOConfigurationException;
import org.beanio.BeanReader;
import org.beanio.StreamFactory;
import org.junit.Test;

import com.google.gson.Gson;

public class EmployeeBeanIOHandlerTest {

    @Test
    public void testHandleEmployee() {

        // mapping pattern file
        String mappingPatternFile = "pattern-mapping.xml";

        // data file (csv)
        String objectFile = "employee.csv";

        // stream name defined in pattern mapping file
        String streamName = "empData";

        Gson gson = new Gson();

        BeanReader beanReader = null;
        Reader reader = null;
        StreamFactory factory = null;
        InputStream in = null;

        try {

            System.out.println("## RESULT FOR " + objectFile + " ##");

            // create a StreamFactory
            factory = StreamFactory.newInstance();

            // load the setting file
            in = this.getClass().getClassLoader()
                    .getResourceAsStream(mappingPatternFile);

            // get input stream reader of object file (data file)
            reader = new InputStreamReader(this.getClass().getClassLoader()
                    .getResourceAsStream(objectFile));

            // load input stream to stream factory
            factory.load(in);

            beanReader = factory.createReader(streamName, reader);
            Map<?, ?> record = null;
            while ((record = (Map<?, ?>) beanReader.read()) != null) {
                System.out.println(beanReader.getRecordName() + ": "
                        + gson.toJson(record));
            }

        } catch (BeanIOConfigurationException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                in.close();
                if (beanReader != null) {
                    beanReader.close();
                }
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

但是我看到的输出：

header: {"id":"Header","date":"01012013"}

emp: {"lastName":"Lilik","title":"Senior Developer","hireDate":"Oct 1, 2009 
12:00:00 AM","salary":7500000,"firstName":"Robertus"}

emp: {"lastName":"Doe","title":"Architect","hireDate":"Jan 15, 2008 12:00:00 AM","salary":8000000,"firstName":"Jane"}

emp: {"lastName":"Anderson","title":"Manager","hireDate":"Mar 18, 2006 12:00:00 AM","salary":9000000,"firstName":"Jon"}

trailer: {"id":"Trailer","count":"3"}

它为找到的每个记录生成单独的json对象。
参考部位：http://www.sourcefreak.com/2013/06/painless-flat-file-parsing-with-beanio/
以下是我的要求：
1.我想要一个统一的Json文件。
1.在重复记录的情况下，它应该形成一个json数组。
如果你能帮忙我会很感激的。