Java读取文件

Posted 2020-10-25 stupid_vincent

1、一次性读取整个文件内容

　　/**
     * 一次性读取全部文件数据
     * @param strFile
     */
    public static void readFile(String strFile){
        try{
            InputStream is = new FileInputStream(strFile);
            int iAvail = is.available();
            byte[] bytes = new byte[iAvail];
            is.read(bytes);
            logger.info("文件内容:\n" + new String(bytes));
            is.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }

2、按行读取文件

/**
     * 按行读取文件
     * @param strFile
     */
    public static void readFileByLine(String strFile){
        try {
            File file = new File(strFile);
            BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
            String strLine = null;
            int lineCount = 1;
            while(null != (strLine = bufferedReader.readLine())){
                logger.info("第[" + lineCount + "]行数据:[" + strLine + "]");
                lineCount++;
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }