fileutil

package com.dingheng.util;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

/**
 * TODO
 *
 * @ClassName: FileUtil
 * @author: DingH
 * @since: 2019/5/28 9:05
 */
public class FileUtil {

    /**
     * 一行写入文件,末尾自动添加

     * @param path
     * @param line
     * @param is_append
     * @param encode
     */
    public static void writeLog(String path, String line, boolean is_append, String encode)
    {
        try
        {
            File file = new File(path);
            if(!file.exists())
                file.createNewFile();
            FileOutputStream out = new FileOutputStream(file, is_append); //true表示追加
            StringBuffer sb = new StringBuffer();
            sb.append(line + "
");
            out.write(sb.toString().getBytes(encode));//
            out.close();
        }
        catch(IOException ex)
        {
            System.out.println(ex.getStackTrace());
        }
    }

    /**
     * 写入文件,末尾自动添加

     * @param lines
     * @param filePath
     * @param ifContinueWrite
     */
    public static void writeFile(List<String> lines, String filePath, boolean ifContinueWrite){
        try{
            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath),"utf-8"));
            for(String line : lines){
                bw.write(line+"
");
            }
            bw.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }


    /**
     * 加入编码
     * 整个文件以string放回，添加
换行
     * @param path
     * @return
     */
    public static String readLogByStringAndEncode(String path, String encode)
    {
        StringBuffer sb=new StringBuffer();
        String tempstr=null;
        try {
            File file=new File(path);
            if(!file.exists())
                throw new FileNotFoundException();
            FileInputStream fis=new FileInputStream(file);
            BufferedReader br=new BufferedReader(new InputStreamReader(fis, encode));
            while((tempstr=br.readLine())!=null) {
                sb.append(tempstr + "
");
            }
        } catch(IOException ex) {
            System.out.println(ex.getStackTrace());
        }
        return sb.toString();
    }

    /**
     * 按行读取文件，以list<String>的形式返回
     * @param filePath
     * @return
     */
    public static List<String> readLogByList(String filePath){
        List<String> lines = new ArrayList<String>();
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath),"utf-8"));
            String line = null;
            while( (line = br.readLine()) != null ){
                lines.add(line);
            }
            br.close();
        }catch(Exception e){
            e.printStackTrace();
        }finally {
            return lines;
        }
    }

}