Java---讀取文件夾下的目錄及文件文件內容

java.io.File file = new java.io.File("文件夾路徑");//文件夾位置D:\\0218Excel

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

String[] list = file.list(); //獲取文件夾下的所有文件

String line = "";

for (String name : list) {

    String substring = name.substring(name.lastIndexOf(".") + 1); //獲取文件中最后一個“.”出現的后一位的字符

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

        try {
            InputStream is = new FileInputStream("文件路徑");//加載文件

            BufferedReader bf = new BufferedReader(new InputStreamReader(is)); //要讀取文件

            BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(wFile, true)); //要寫文

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

               bufferedWriter.write(value); //將取到的值寫入文件

               bf.close();

               bufferedWriter.close();

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

    }
}