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(); } }