使用apache commons csv解析del（类似csv）格式文件

Posted 2020-11-17 <・)))><<

del格式类似csv，我这里的测试文件test.del是从DB2数据库中导出来的一组数据。
apache commons csv的maven坐标为：

<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-csv -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-csv</artifactId>
    <version>1.5</version>
</dependency>

测试程序：

package test;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVRecord;

public class DelFileParser {
    
    public static List< List<String> > parseFile(File file) {       
        List resList = new ArrayList< List<String> >();
        try {
            InputStream is = new FileInputStream(file);  
            InputStreamReader reader = new InputStreamReader(is, "GB2312");  
            CSVParser parser = new CSVParser(reader, CSVFormat.DEFAULT);
            for (CSVRecord record : parser) {
                List<String> tmpList = new ArrayList<String>();
                for (String s : record) {
                    if (s != null) 
                        s = s.trim();
                    tmpList.add(s);
                }
                resList.add(tmpList);
            }
            is.close();
            reader.close();
            return resList;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
    
    public static void main(String[] args) {
        List< List<String> > resList = parseFile(new File("D:\test.del"));
        // test
        for (List<String> tmpList : resList) {
            for (String s : tmpList) {
                System.out.print(s + ",");
            }
            System.out.println();
        }
    }
}

采用default格式不会将第一行当成Header。

更多资料参见：http://commons.apache.org/proper/commons-csv/user-guide.html