从文件中读取数组数据————Java

自己总结一下Java文件的读取类似数组数据的方法，自己可以快速查看。

一、规整化数据：

对于数组数据是一一对应的情况

        ArrayList<String> arrayList = new ArrayList<>();
        try {
            File file = new File(path);
            InputStreamReader input = new InputStreamReader(new FileInputStream(file));
            BufferedReader bf = new BufferedReader(input);
            // 按行读取字符串
            String str;
            while ((str = bf.readLine()) != null) {
                arrayList.add(str);
            }
            bf.close();
            input.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 对ArrayList中存储的字符串进行处理
        int length = arrayList.size();
        int width = arrayList.get(0).split(" ").length;
        int array[][] = new int[length][width];
        for (int i = 0; i < length; i++) {
            for (int j = 0; j < width; j++) {
                String s = arrayList.get(i).split(" ")[j];
                array[i][j] = Integer.parseInt(s);
            }
        }
        for (int i = 0; i < length; i++) {
            for (int j = 0; j < width; j++) {
                System.out.print(array[i][j] + " ");
            }
            System.out.println();
        }

二、非规整化数据：

    private static void file(String fileName) throws Exception {
        int array[][] = new int[1024][1024];

        File file = new File(fileName);
        Scanner sc = new Scanner(file);

        String[] odd = new String[40]; // 奇数行数据
        String[] even = new String[40]; // 偶数行数据

        int length = 0;
        int column = 0;
        int rows = 1;
        while (sc.hasNextLine()) {
            if ((rows % 2) == 1) { // 奇数行
                odd = sc.nextLine().split("\\s{1,}");  // split("\\2{1,}");不论字符中间有多少个空格都当作一个空格处理
                for (int i = 0; i < odd.length-1; i++) {
                    array[length][i] = Integer.parseInt(odd[i]);
                }
            } else if ((rows % 2) == 0) { // 偶数行
                even = sc.nextLine().split("\\s{1,}");
                for (int i = 0; i < even.length-1; i++) {
                    array[length][i] = Integer.parseInt(even[i]);
                }
            }
            if (rows == 2) {
                column = even.length;
            }
            length++;
            rows++;
        }
        sc.close();
        for (int i = 0; i < length; i++) {
            for (int j = 0; j < column; j++) {
                System.out.print(array[i][j] + " ");
            }
            System.out.println();
        }
    }