java按行分割文件

package com.ceair.utils;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class FileTest {

	public static void main(String[] args) {
		splitDataToSaveFile(4, "E:\\pss_2017\\psdp-tsdata-datahub\\src\\main\\resources\\test.txt",
				"E:\\pss_2017\\psdp-tsdata-datahub\\src\\main\\resources\\");
	}

	/**
	 * 按行分割文件
	 * 
	 * @param rows
	 *            为多少行一个文件
	 * @param sourceFilePath
	 *            为源文件路径
	 * @param targetDirectoryPath
	 *            文件分割后存放的目标目录
	 */
	public static void splitDataToSaveFile(int rows, String sourceFilePath, String targetDirectoryPath) {
		File sourceFile = new File(sourceFilePath);
		File targetFile = new File(targetDirectoryPath);
		if (!sourceFile.exists() || rows <= 0 || sourceFile.isDirectory()) {
			return;
		}
		if (targetFile.exists()) {
			if (!targetFile.isDirectory()) {
				return;
			}
		} else {
			targetFile.mkdirs();
		}
		try {

			InputStreamReader in = new InputStreamReader(new FileInputStream(sourceFilePath), "GBK");
			BufferedReader br = new BufferedReader(in);

			BufferedWriter bw = null;
			String str = "";
			String tempData = br.readLine();
			int i = 1, s = 0;
			while (tempData != null) {
				str += tempData + "\r\n";
				if (i % rows == 0) {
					bw = new BufferedWriter(new OutputStreamWriter(
							new FileOutputStream(targetFile.getAbsolutePath() + "/" + sourceFile.getName() + "_" + (s + 1) + ".txt"), "UTF-8"), 1024);

					bw.write(str);
					bw.close();

					str = "";
					s += 1;
				}
				i++;
				tempData = br.readLine();
			}
			if ((i - 1) % rows != 0) {

				bw = new BufferedWriter(
						new OutputStreamWriter(
								new FileOutputStream(targetFile.getAbsolutePath() + "/" + sourceFile.getName() + "_" + (s + 1) + ".txt"), "UTF-8"),
						1024);
				bw.write(str);
				bw.close();
				br.close();

				s += 1;
			}
			in.close();

		} catch (Exception e) {
		}
	}
}