Java---读取文件夹下的目录及文件文件内容

java.io.File file = new java.io.File("文件夹路径");//文件夹位置D:\\0218Excel

File wFile = new File("D:\\0218Excel\\sql.sql");//文件路径

String[] list = file.list(); //获取文件夹下的所有文件

String line = "";

for (String name : list) {

    String substring = name.substring(name.lastIndexOf(".") + 1); //获取文件中最后一个“.”出现的后一位的字符

    if(substring.equals("r")){

        try {
            InputStream is = new FileInputStream("文件路径");//加载文件

            BufferedReader bf = new BufferedReader(new InputStreamReader(is)); //要读取文件

            BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(wFile, true)); //要写文

            while ((line=bf.readLine()) != null) {
                
               String value = line.split("\\|")[25].trim();//根据“|”进行分割取值

               bufferedWriter.write(value); //将取到的值写入文件

               bf.close();

               bufferedWriter.close();

            
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}