Question

我正在尝试使用beanIo解析一个固定长度的平面文件到json

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();
            }
        }
    }

}

然而输出我看到了：

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"}

为每个找到的记录生成单独的json对象。

参考网站： http://www.sourcefreak.com/2013/06/painless-flat-file-parsing-with-beanio/

以下是我的要求：

我想要一个合并的Json文件。
如果有重复记录，它应该形成一个json数组。

我很感激你的帮助。

Answer 1

此答案基于OP提供的链接中的数据和pattern-mapping.xml文件。

数据：

接头，01012013
  Robertus，Lilik，高级开发人员，“75,000,00”，10012009
  简，DOE，建筑师， “80,000,00”，01152008
  乔恩·安德森，经理， “90,000,00”，03182006
  页脚，3

映射文件：
这是修改后的pattern-mapping.xml文件。请注意使用<group>元素（myGroup）将所有内容封装到一个组中，这将迫使BeanReader一次性读取所有内容。我还将maxOccurs和Header记录的Footer更改为1（一）。另外，添加了collection="list" attribute to the emp`记录

<?xml version='1.0' encoding='UTF-8' ?> <beanio xmlns="http://www.beanio.org/2012/03" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.beanio.org/2012/03 http://www.beanio.org/2012/03/mapping.xsd"> <stream name="empData" format="csv"> <group name="myGroup" class="map"> <record name="header" class="map" ridLength="0-2" maxOccurs="1"> <field name="id" rid="true" maxOccurs="1" literal="Header" /> <field name="date" /> </record> <record name="emp" class="map" ridLength="4-5" collection="list"> <field name="firstName" /> <field name="lastName" /> <field name="title" /> <field name="salary" type="java.math.BigDecimal" format="#,###,###,00" /> <field name="hireDate" type="java.util.Date" format="MMddyyyy" minOccurs="0" /> </record> <record name="trailer" class="map" ridLength="2" maxOccurs="1"> <field name="id" /> <field name="count" /> </record> </group> </stream> </beanio>

使用提供的测试用例和修改后的映射文件，我们得到了这个结果（由我重新格式化）：

myGroup: { "trailer": { "count": "3", "id": "Footer" }, "header": { "date": "01012013", "id": "Header" }, "emp": [ { "firstName": "Robertus", "lastName": "Lilik", "hireDate": "Oct 1, 2009 12:00:00 AM", "title": "Senior Developer", "salary": 7500000 }, { "firstName": "Jane", "lastName": "Doe", "hireDate": "Jan 15, 2008 12:00:00 AM", "title": "Architect", "salary": 8000000 }, { "firstName": "Jon", "lastName": "Anderson", "hireDate": "Mar 18, 2006 12:00:00 AM", "title": "Manager", "salary": 9000000 } ] }

希望这有帮助

使用beanIo将文件转换为json

1 个答案: