使用BufferedReader和BufferedWriter实现对文件的读写

使用BufferedReader和BufferedWriter实现对文件的读写

BufferedReader

public static void main(String[] args) {
        BufferedReader bufferedReader = null;
        FileReader fileReader = null;
        try {
            fileReader = new FileReader("C:\\Users\\wjq\\Desktop\\123.txt");
            bufferedReader = new BufferedReader(fileReader);

            String line;
            while ((line = bufferedReader.readLine()) != null) {
                System.err.println(line);
            }
            bufferedReader.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (!StringUtil.isEmpty(bufferedReader)) {
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

BufferedWriter

public static void main(String[] args) {
        BufferedWriter bufferedWriter = null;
        try {

            /**
             * 1、 FileWriter fileWriter = new FileWriter("C:\\Users\\王靖钦\\Desktop\\123.txt", true);
             *    在文件的末尾处追加内容
             * 2、 FileWriter fileWriter = new FileWriter("C:\\Users\\王靖钦\\Desktop\\123.txt");
             *    清除原文件内容，再写入
             */
            FileWriter fileWriter = new FileWriter("C:\\Users\\wjq\\Desktop\\123.txt", true);
            bufferedWriter = new BufferedWriter(fileWriter);
            bufferedWriter.append("张三\n");
//            bufferedWriter.newLine(); //换行=\n
            bufferedWriter.append("李四\n");
            bufferedWriter.flush();
            bufferedWriter.close();

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (!StringUtil.isEmpty(bufferedWriter)) {
                try {
                    bufferedWriter.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }