java读取文件夹下文件及txt内容

public class PositionController {
    // 读取txt内容
    public static String txt2String(File file) {
        StringBuilder result = new StringBuilder();
        try {
            BufferedReader br = new BufferedReader(new FileReader(file));// 构造一个BufferedReader类来读取文件
            String s = null;
            while ((s = br.readLine()) != null) {// 使用readLine方法，一次读一行
                result.append(System.lineSeparator() + s);
            }
            br.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result.toString();
    }

    // 读取文件夹下所有文件名
    public static List getFile(File file) {
        List listLocal = new ArrayList<>();
        if (file != null) {
            File[] f = file.listFiles();
            if (f != null) {
                for (int i = 0; i < f.length; i++) {
                    getFile(f[i]);
                    listLocal.add(f[i]);
                }
            } else {
                // System.out.println(file);
            }
        }
        return listLocal;
    }

    public String getTxt(ModelMap map) throws FileNotFoundException {
            // 文件夹下每一个txt名
            String path = "D:/wode/TestReallyData/txt2/txt_all/";
            File all = new File(path);
            //将全部txt存到list中
            List allPath = getFile(all);
              // 读取txt内容 并转换成List
              for(int i = 0 ;i <allPath.size();i++){
                File file = new File(i);
                String content = txt2String(file);
              }
    　　}
}