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fileutil

  1 package com.dingheng.util;
  2 
  3 import java.io.*;
  4 import java.util.ArrayList;
  5 import java.util.List;
  6 
  7 /**
  8  * TODO
  9  *
 10  * @ClassName: FileUtil
 11  * @author: DingH
 12  * @since: 2019/5/28 9:05
 13  */
 14 public class FileUtil {
 15 
 16     /**
 17      * 一行写入文件,末尾自动添加\n
 18      * @param path
 19      * @param line
 20      * @param is_append
 21      * @param encode
 22      */
 23     public static void writeLog(String path, String line, boolean is_append, String encode)
 24     {
 25         try
 26         {
 27             File file = new File(path);
 28             if(!file.exists())
 29                 file.createNewFile();
 30             FileOutputStream out = new FileOutputStream(file, is_append); //true表示追加
 31             StringBuffer sb = new StringBuffer();
 32             sb.append(line + "\n");
 33             out.write(sb.toString().getBytes(encode));//
 34             out.close();
 35         }
 36         catch(IOException ex)
 37         {
 38             System.out.println(ex.getStackTrace());
 39         }
 40     }
 41 
 42     /**
 43      * 写入文件,末尾自动添加\n
 44      * @param lines
 45      * @param filePath
 46      * @param ifContinueWrite
 47      */
 48     public static void writeFile(List<String> lines, String filePath, boolean ifContinueWrite){
 49         try{
 50             BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath),"utf-8"));
 51             for(String line : lines){
 52                 bw.write(line+"\n");
 53             }
 54             bw.close();
 55         }catch(Exception e){
 56             e.printStackTrace();
 57         }
 58     }
 59 
 60 
 61     /**
 62      * 加入编码
 63      * 整个文件以string放回，添加\n换行
 64      * @param path
 65      * @return
 66      */
 67     public static String readLogByStringAndEncode(String path, String encode)
 68     {
 69         StringBuffer sb=new StringBuffer();
 70         String tempstr=null;
 71         try {
 72             File file=new File(path);
 73             if(!file.exists())
 74                 throw new FileNotFoundException();
 75             FileInputStream fis=new FileInputStream(file);
 76             BufferedReader br=new BufferedReader(new InputStreamReader(fis, encode));
 77             while((tempstr=br.readLine())!=null) {
 78                 sb.append(tempstr + "\n");
 79             }
 80         } catch(IOException ex) {
 81             System.out.println(ex.getStackTrace());
 82         }
 83         return sb.toString();
 84     }
 85 
 86     /**
 87      * 按行读取文件，以list<String>的形式返回
 88      * @param filePath
 89      * @return
 90      */
 91     public static List<String> readLogByList(String filePath){
 92         List<String> lines = new ArrayList<String>();
 93         try {
 94             BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath),"utf-8"));
 95             String line = null;
 96             while( (line = br.readLine()) != null ){
 97                 lines.add(line);
 98             }
 99             br.close();
100         }catch(Exception e){
101             e.printStackTrace();
102         }finally {
103             return lines;
104         }
105     }
106 
107 }