可以将一个大文件分割成小文件,每个指定行数
package com.example; import java.io.BufferedReader; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; public class SplitFile20180522 { public static void main(String[] args) throws IOException { String filePath = "D:\\downloads\\split\\20180521-3.csv"; boolean skipFirstLine = true; int linePerFile = 10000000; System.out.println(filePath); try (BufferedReader br = new BufferedReader(new FileReader(filePath))) { String line; int lineCount = 0; int writeFileCount = 1; FileWriter fileWriter = null; if (skipFirstLine) { br.readLine(); } while ((line = br.readLine()) != null) { lineCount++; if (fileWriter == null) { fileWriter = new FileWriter(filePath + "_" + writeFileCount, false); } fileWriter.write(line + "\r\n"); if (lineCount % linePerFile == 0) { System.out.println("write file " + writeFileCount + " done"); fileWriter.close(); fileWriter = null; writeFileCount++; } } if (fileWriter != null) { System.out.println("write file " + writeFileCount + " done"); fileWriter.close(); } } } }
咋还用上了java
啥顺手用啥,都搬砖那么多年了,还纠结语言问题嘛