java大文件拆分工具（过滤掉表头）
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class SplitTools {
public static void main(String[] args) throws IOException {
// "E:\\eutranrelation.csv";
String bigFilePath = args[0];
// "E:\\eutranrelation-%s.csv";
String splitFileParttern = args[1];
// 32
int splitFileCount = Integer.valueOf(args[2]);
BufferedReader reader = new BufferedReader(new FileReader(bigFilePath));
String header = reader.readLine();
int totalLine = 0;
if (header != null) {
String line = null;
while ((line = reader.readLine()) != null) {
totalLine++;
}
}
reader.close();
int splitFileTotalLines = totalLine / splitFileCount;
int generateFileIdx = 0;
BufferedWriter bufferedWriter = null;
reader = new BufferedReader(new FileReader(bigFilePath));
header = reader.readLine();
int currentIdx = 0;
if (header != null) {
String line = null;
while ((line = reader.readLine()) != null) {
if (currentIdx == 0) {
String filePath = String.format(splitFileParttern,
String.valueOf(generateFileIdx));
bufferedWriter = new BufferedWriter(
new FileWriter(filePath));
}
bufferedWriter.write(line + "\r\n");
currentIdx++;
if (currentIdx == splitFileTotalLines) {
generateFileIdx++;
if (generateFileIdx != splitFileCount) {
currentIdx = 0;
bufferedWriter.flush();
bufferedWriter.close();
}
}
}
if (bufferedWriter != null) {
bufferedWriter.flush();
bufferedWriter.close();
}
}
reader.close();
System.out.println("The total number of documents is:" + totalLine);
}
}
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