package com.xxl.job.core.util;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.*;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* file tool
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*
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* @author xuxueli 2017-12-29 17:56:48
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*/
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public class FileUtil {
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private static Logger logger = LoggerFactory.getLogger(FileUtil.class);
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/**
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* delete recursively
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*
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* @param root
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* @return
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*/
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public static boolean deleteRecursively(File root) {
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if (root != null && root.exists()) {
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if (root.isDirectory()) {
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File[] children = root.listFiles();
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if (children != null) {
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for (File child : children) {
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deleteRecursively(child);
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}
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}
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}
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return root.delete();
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}
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return false;
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}
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public static void deleteFile(String fileName) {
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// file
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File file = new File(fileName);
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if (file.exists()) {
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file.delete();
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}
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}
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public static void appendFileLine(String fileName, String content) {
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// file
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File file = new File(fileName);
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if (!file.exists()) {
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try {
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file.createNewFile();
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} catch (IOException e) {
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logger.error(e.getMessage(), e);
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return;
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}
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}
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// content
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if (content == null) {
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content = "";
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}
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content += "\r\n";
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// append file content
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FileOutputStream fos = null;
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try {
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fos = new FileOutputStream(file, true);
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fos.write(content.getBytes("utf-8"));
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fos.flush();
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} catch (Exception e) {
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logger.error(e.getMessage(), e);
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} finally {
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if (fos != null) {
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try {
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fos.close();
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} catch (IOException e) {
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logger.error(e.getMessage(), e);
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}
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}
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}
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}
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public static List<String> loadFileLines(String fileName){
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List<String> result = new ArrayList<>();
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// valid log file
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File file = new File(fileName);
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if (!file.exists()) {
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return result;
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}
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// read file
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StringBuffer logContentBuffer = new StringBuffer();
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int toLineNum = 0;
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LineNumberReader reader = null;
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try {
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//reader = new LineNumberReader(new FileReader(logFile));
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reader = new LineNumberReader(new InputStreamReader(new FileInputStream(file), "utf-8"));
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String line = null;
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while ((line = reader.readLine())!=null) {
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if (line!=null && line.trim().length()>0) {
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result.add(line);
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}
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}
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} catch (IOException e) {
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logger.error(e.getMessage(), e);
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} finally {
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if (reader != null) {
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try {
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reader.close();
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} catch (IOException e) {
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logger.error(e.getMessage(), e);
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}
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}
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}
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return result;
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}
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}
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