找出文件1中有而文件2中没有的数据

    // 使用stream方法实现
    public static List<String> fileterData() throws IOException {

        String file1Content = new String(Files.readAllBytes(Paths.get(".\\src\\main\\resources\\File1")));
        String file2Content = new String(
                Files.readAllBytes(Paths.get(".\\src\\main\\resources\\File2")));
        // String 的 split方法有隐患，WINDOWS下换行符使用\r\n，Linux下使用的是\n
        List<String> file1Str = Arrays.asList(file1Content.split("\r\n"));
        List<String> file2Str= Arrays.asList(file2Content.split("\r\n"));
        // 过滤收集，遍历file1,每个都在file2中进行检查一遍，如果file2中没有的就收集起来
        List<String> filtedStr = file1Str.stream().filter(t -> false == file2Str.contains(t))
                .collect(Collectors.toList());
        return filtedStr;

    }

    // 找出file1中有但是file2中没有的数据
    public static List<String> filterData() throws IOException {
        // TODO Auto-generated method stub
        String file1Path = ".\\src\\main\\resources\\File1";
        String file2Path = ".\\src\\main\\resources\\File2";

        BufferedReader file1br = new BufferedReader(new FileReader(file1Path));
        BufferedReader file2br = new BufferedReader(new FileReader(file2Path));
        String line = "";

        List<String> file2String= new ArrayList<>();
        while ((line = file2br.readLine()) != null) {
            file2String.add(line);

        }
        while ((line = file1br.readLine()) != null) {
            if (false == file2String.contains(line)) {
                System.out.println(line);
            } else {
                file2String.remove(line);
            }

        }
return file2String;

    }