讀取檔案內容

//讀取檔案內容
//https://www.facebook.com/groups/1403852566495675/permalink/2189564644591126/
//author: Kuo, Hsiang-Yu
//author: 90ED_7FD4_5B87
package com.sample;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class MainClass {
    public static void main(String[] args) {
        // long t1 = System.nanoTime();
        File file = new File("C:\\Users\\acer\\WorkspaceJava\\讀取檔案內容\\test.txt");
        Scanner scanner = null;
        try {
            scanner = new Scanner(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            System.out.println("e = " + e);
        }
        int countLine = 0;
        while (scanner.hasNext()) {
            // 統計這個檔案有幾行字串。
            scanner.nextLine();
            countLine = countLine + 1;
        }
        // System.out.println("countLine = " + countLine);
        try {
            scanner = null;
            scanner = new Scanner(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            System.out.println("e = " + e);
        }
        Item[] item = new Item[countLine];// 建一個物件陣列來儲存字串內容。
        String input = "";
        String[] output2 = new String[4];// 設一個陣列，專門儲存切割出來的4個字串。
        int j = 0, k = 0;
        while (scanner.hasNext()) {
            input = scanner.nextLine();
            input = input.trim();// 清除字串前後多餘空白
            // System.out.println(input);
            String[] output = input.split(" ");// 以空格當成切割字元，分割字串。
            j = 0;
            for (int i = 0; i < output.length; i++) {
                if (output[i].equals("") == false) {
                    output2[j] = output[i];
                    j = j + 1;
                }
            }
            item[k] = new Item(output2[0], output2[1], output2[2], output2[3]);
            k = k + 1;
        }
        // long t2 = System.nanoTime();
        // double seconds = (double) (t2 - t1) / 1000000000.0D;
        // System.out.printf("%f seconds\n", seconds);
        scanner = null;
        scanner = new Scanner(System.in);
        System.out.printf("請輸入檢索資料：");
        input = scanner.next();
        boolean findData = false;
        for (int i = 0; i < item.length; i++) {
            if (item[i].type.equals(input)) {
                item[i].show();
                findData = true;
            }
        }
        if (findData == false) {
            System.out.printf("查無資料。\n");
        }
        scanner.close();
        System.out.printf("\n");
        System.out.println("BUILD SUCCESSFUL (total time: 0 seconds)");
    }
}

class Item {
    String id;
    String name;
    String type;
    String year;

    Item(String id, String name, String type, String year) {
        this.id = id;
        this.name = name;
        this.type = type;
        this.year = year;
    }

    void show() {
        // System.out.println(id + " " + name + " " + type + " " + year);
        System.out.printf("%-8s%-7s%-8s%s\n", id, name, type, year);
    }
}