[英]How to store Header in all splitted CSV files?
下面的java代码是将一个big.csv文件拆分成多个.csv文件。 但是如何将 Header 存储在所有拆分的文件中?
import java.io.*;
import java.util.Scanner;
import java.io.File;
import java.io.FileInputStream;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class split {
public static void main(String args[]) {
try {
String inputfile = "E:/Sumit/csv-splitting-2/Proposal_Details__c.csv";
System.out.println("Input Path is :- " + inputfile);
double nol = 100000.0;
File file = new File(inputfile);
Scanner scanner = new Scanner(file);
int count = 0;
while (scanner.hasNextLine()) {
scanner.nextLine();
count++;
}
System.out.println("Lines in the file: " + count);
double temp = (count / nol);
int temp1 = (int) temp;
int nof = 0;
if (temp1 == temp) {
nof = temp1;
} else {
nof = temp1 + 1;
}
System.out.println("No. of files to be generated :" + nof);
FileInputStream fstream = new FileInputStream(inputfile);
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
for (int j = 1; j <= nof; j++) {
String outputpath = "E:/Sumit/csv-splitting-2/";
String outputfile = "File-2-Proposal_Details__c" + j + ".csv";
System.out.println(outputpath + outputfile);
FileWriter fstream1 = new FileWriter(outputpath + outputfile);
BufferedWriter out = new BufferedWriter(fstream1);
for (int i = 1; i <= nol; i++) {
strLine = br.readLine();
if (strLine != null) {
out.write(strLine);
if (i != nol) {
out.newLine();
}
}
}
out.close();
}
in.close();
} catch (Exception e) {
System.err.println("Error: " + e.getMessage());
}
}
}
假设你的第一行是 header,你可以有一个String header;
这将读取第一行,例如: header = br.readLine();
.
在你的 for 循环 for nof
(我假设它的意思是number_of_files
),你总是在创建新文件时添加 header 作为第一行。
它会是这样的:
String header = br.readLine();
our.write(header);
一般提示:
nol
, nof
, j
...它们都没有意义,例如,您几乎可以称它们为numOfLines
、 numOfFiles
和currentFile
。
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