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我是 Java 新手。有人可以向我建议如何读取包含 7 列的 CSV 文件吗？

这是我的代码：

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class main {

    public static  Map<String,String> map1 = null;
    public static  Map<String,String> map2 = null;

    public static void main(String[] args) {
        try {
            readFileandPopulate();
            for (Map.Entry<String, String> entry : map1.entrySet()) {
                System.out.println("Key : " + entry.getKey() + " Value : "
                    + entry.getValue()+" address :"+map2.get(entry.getKey()));
                //insert into DB
            }
        } catch (Exception e) {//Catch exception if any
            e.printStackTrace();
            System.err.println("Error: " + e.getMessage());
        }
    }

    public static void readFileandPopulate() throws Exception {
        FileInputStream fstream = new FileInputStream("/Users/Desktop/Pattern Recognition/DataSetR/1a19.csv");
        // Use DataInputStream to read binary NOT text.
        BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
        String strLine;
        map1 = new HashMap<String,String>();
        while ((strLine = br.readLine()) != null) {
            System.out.println(strLine);
            String temp[] = strLine.split(",");
            map1.put(temp[0], temp[1]);
        }
        in.close();
        System.out.println("done 1");

    }
}

有没有什么方法可以只读取几列并删除剩余的数据，或者我可以将所有值存储在数组中并使用数组的索引来计算一个使用值的方程？

4

2 回答 2

0 
import java.io.FileReader;
import java.io.IOException;
import java.util.List;

import au.com.bytecode.opencsv.CSVReader;

public class ReadCSV 
{
    public static void main(String[] args) throws IOException 
    {
        String[] row = null;
        String csvFilename = "C:/Users/Hussain/Desktop/data.csv";
        CSVReader csvReader = new CSVReader(new FileReader(csvFilename));
        List content = csvReader.readAll();
        for (Object object : content) 
        {
            row = (String[]) object;
            System.out.println("value in row 7 ===>>>"+row[6]);
        }
        csvReader.close();
        }
}

你可以从这里添加罐子

于 2013-02-16T19:46:00.607 回答
0

我建议使用 CSV 解析器，例如http://opencsv.sourceforge.net/。然后您可以执行以下操作：

CSVReader reader = new CSVReader(new FileReader(filePath), ',');

List<String[]> rows= reader.readAll();

for (String[] row : rows)
{
    for (int i = 0; i < numColumnsToParse; i++)
    {
        //do something with row[i]
    }
}
于 2013-02-16T19:08:51.563 回答