23 遍历删除本地目录的方法，文件末尾追加内容，按行读取文件内容

Posted 2020-08-20 life_start

1、遍历删除本地目录

    /**
     * 递归删除非空目录
     * @param file
     */
    public static void deletNotEmptyDir(File file){
            File[] files = file.listFiles();
            if (files != null) {
                for (File f : files) {
                    deletNotEmptyDir(f);
                }
            }
           file.delete();
    }

2、文件末尾追加内容

  /**
     * 在文件末尾追加字符串
     * @param filePath
     * @param appendStr
     * @return
     */
    public static Boolean appendStringToFile(String filePath,String appendStr){
        Boolean sucess=true;
        if(!new File(filePath).exists()){
            LOG.error("文件：{}不存在",filePath);
            return false;
        }
        FileWriter writer=null;
        try {
             writer=new FileWriter(filePath,true);
            writer.write("\n"+appendStr);
        } catch (IOException e) {
            sucess=false;
            e.printStackTrace();
        }finally {
            if(null!=writer){
                try {
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return sucess;
    }

 

3、按行读取文件内容

/**
     * 把文件内容一行一行放到list里面
     * @return
     */
    public static List<String> resolveFileByLine(String filePath){
        List<String> list=new ArrayList<>();
        BufferedReader bufferedReader=null;
        try {
            bufferedReader=new BufferedReader(new FileReader(filePath));
            String line=null;
            while (null!=(line=bufferedReader.readLine())){
                list.add(line.trim());
            }
        } catch (FileNotFoundException e) {
            LOG.error("未发现文件：{}",filePath);
            e.printStackTrace();
        } catch (IOException e) {
            LOG.error("读取文件：{} 异常,异常信息：{}",filePath,e.getMessage());
            e.printStackTrace();
        }finally {
            if(null!=bufferedReader){
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return list;
    }