Java file reading and writing--tool method

package util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.springframework.util.StringUtils;

public class FileUtil {

	
	/**
	 * @Title: writeFileByLines
	 * @Description: 按行写文件
	 * @param fileName 
	 * @param strs
	 * @param append  是否追加
	 * @throws IOException
	 * @date: 2021-01-25 12:32
	 */
	public static void writeFileByLines(String fileName, String[] strs, boolean append) throws IOException {
		FileWriter fw = new FileWriter(fileName, append);
		for (String str : strs) {
			fw.write(str);
			fw.write("\n");//换行
		}
		fw.flush();
		fw.close();
	}

	/**
	 * @Title: readFile
	 * @Description: 读取文件内容
	 * @param filePathAndName  绝对路径
	 * @param encoding   编码格式
	 * @return String
	 * @date: 2021-01-25 12:39 
	 */
	public static String readFile(String filePathAndName,String encoding) {
		String fileContent = "";
		try {
			if (StringUtils.isEmpty(encoding)) {
				encoding = "UTF-8";
			}
			File f = new File(filePathAndName);
			if (f.isFile() && f.exists()) {
				InputStreamReader read = new InputStreamReader(new FileInputStream(f), encoding);
				BufferedReader reader = new BufferedReader(read);
				String line;
				while ((line = reader.readLine()) != null) {
					fileContent += line;
				}
				read.close();
			}
		} catch (Exception e) {
			System.out.println("读取文件内容操作出错");
			e.printStackTrace();
		}
		return fileContent;
	}

	/**
	 * @Title: readTxtFileToListString
	 * @Description: 读取txt文本文件
	 * @param filePath
	 * @param encoding   编码格式
	 * @return List<String>
	 * @date: 2021-01-25 12:32
	 */
	public static List<String> readTxtFileToListString(String filePath, String encoding) {
		List<String> listContent = new ArrayList<>();
		try {
			if (StringUtils.isEmpty(encoding)) {
				encoding = "UTF-8";
			}
			File file = new File(filePath);
			if (file.isFile() && file.exists()) { // 判断文件是否存在
				InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);// 考虑到编码格式
				BufferedReader bufferedReader = new BufferedReader(read);
				String lineTxt = null;
				while ((lineTxt = bufferedReader.readLine()) != null) {
					// System.out.println(lineTxt);
					listContent.add(lineTxt);
				}
				read.close();
			} else {
				System.out.println("找不到指定的文件");
			}
		} catch (Exception e) {
			System.out.println("读取文件内容出错");
			e.printStackTrace();
		}
		return listContent;
	}
}