逐列读取CSV文件 [英] Read CSV file column by column

问题描述

我想从多列csv文件中读取特定列，并使用Java在其他csv文件中打印这些列。任何帮助吗？下面是我的代码，每行打印每个标记行。但我打算只打印多列csv中的几列。

I want to read specific columns from a multi column csv file and print those columns in other csv file using Java. Any help please? Following is my code to print each token line by line..But I am looking to print only few columns out of the multi column csv.

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.StringTokenizer;

public class ParseCSV {

    public static void main(String[] args) {

        try
        {

            //csv file containing data
            String strFile = "C:\\Users\\rsaluja\\CMS_Evaluation\\Drupal_12_08_27.csv";

            //create BufferedReader to read csv file
            BufferedReader br = new BufferedReader( new FileReader(strFile));
            String strLine = "";
            StringTokenizer st = null;
            int lineNumber = 0, tokenNumber = 0;

            //read comma separated file line by line
            while( (strLine = br.readLine()) != null)
            {
                lineNumber++;

                //break comma separated line using ","
                st = new StringTokenizer(strLine, ",");

                while(st.hasMoreTokens())
                {
                //display csv values
                tokenNumber++;
                System.out.println("Line # " + lineNumber +
                                ", Token # " + tokenNumber
                                + ", Token : "+ st.nextToken());


                            System.out.println(cols[4]);

推荐答案

您应该使用优秀的 OpenCSV 来读取和写入CSV文件。为了使你的例子适用于使用库，它看起来像这样：

You should use the excellent OpenCSV for reading and writing CSV files. To adapt your example to use the library it would look like this:

public class ParseCSV {
  public static void main(String[] args) {
    try {
      //csv file containing data
      String strFile = "C:\\Users\\rsaluja\\CMS_Evaluation\\Drupal_12_08_27.csv";
      CSVReader reader = new CSVReader(new FileReader(strFile));
      String [] nextLine;
      int lineNumber = 0;
      while ((nextLine = reader.readNext()) != null) {
        lineNumber++;
        System.out.println("Line # " + lineNumber);

        // nextLine[] is an array of values from the line
        System.out.println(nextLine[4] + "etc...");
      }
    }
  }
}

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