1. package test0411;
    3. import java.io.*;
    4. import java.util.ArrayList;
    5. import java.util.Iterator;
    6. import java.util.List;
    7. import java.util.Scanner;
    9. public class demo5 {
    10.     public static void main(String[] args) {
    11.         // 1.获取文件
    12.         FileInputStream fis = null;
    13.         FileOutputStream fos = null;
    14.         try {
    15.             fis = new FileInputStream("D:\\phonenumber.txt");
    16.             fos = new FileOutputStream("D:\\phonenumber.txt",true);
    17. //            add(fos);
    18. //            delete(fis);
    19. //            change(fis);
    20. //            search(fis);
    21.         } catch (IOException e) {
    22.             e.printStackTrace();
    23.         } finally {
    24.             if (fis != null) {
    25.                 try {
    26.                     fis.close();
    27.                 } catch (IOException e) {
    28.                     e.printStackTrace();
    29.                 }
    30.             }
    31.             if (fos != null) {
    32.                 try {
    33.                     fos.close();
    34.                 } catch (IOException e) {
    35.                     e.printStackTrace();
    36.                 }
    37.             }
    38.             if (fos != null) {
    39.                 try {
    40.                     fos.flush();
    41.                 } catch (IOException e) {
    42.                     e.printStackTrace();
    43.                 }
    44.             }
    45.         }
    46.         // 2.查功能
    47.         // 3.增
    48.         // 4.改
    49.         // 5.删
    50.     }
    52.     private static void change(FileInputStream fis) throws IOException {
    53.         String name = "张三";
    54.         List list = new ArrayList();
    55.         Scanner sc = new Scanner(fis);
    56.         while (sc.hasNext()){
    57.             list.add(sc.next());
    58.         }
    59.         int i=0;
    60.         Object s = null;
    61.         String newnum = "9998";
    62.         while (i<list.size()){
    63.             s = list.get(i);
    64.             if (s.toString().equals(name)){
    65.                 list.set(i+1,newnum);
    66.                 break;
    67.             }
    68.             i+=1;
    69.         }
    70.         FileWriter fw = new FileWriter("D:\\phonenumber.txt");
    71.         while(i<list.size()){
    72.             String str = list.get(i).toString()+" "+list.get(i+1)+"\n";
    73.             System.out.println(str);
    74.             fw.write(str);
    75.             i+=2;
    76.         }
    77.         fw.flush();
    78.         fw.close();
    79.     }
    81.     private static void search(FileInputStream fis) {
    82.         String name = "张三";
    83.         List list = new ArrayList();
    84.         Scanner sc = new Scanner(fis);
    85.         while (sc.hasNext()){
    86.             list.add(sc.next());
    87.         }
    88.         int i=0;
    89.         Object s = null;
    90.         while (i<list.size()){
    91.             s = list.get(i);
    92.             if (s.toString().equals(name)){
    93.                 System.out.println(list.get(i+1));
    94.                 break;
    95.             }
    96.             i+=1;
    97.         }
    98.     }
    100.     private static boolean delete(FileInputStream fis) throws IOException {
    101.         String name = "李四";
    102.         boolean flat = false;
    103.         List list = new ArrayList();
    104.         Scanner sc = new Scanner(fis);
    106.         while (sc.hasNext()){
    107.             list.add(sc.next());
    108.         }
    109.         System.out.println(list);
    110.         int i=0;
    111.         Object s = null;
    112.         while (i<list.size()){
    113.             s = list.get(i);
    114.             if (s.toString().equals(name)){
    115.                 list.remove(i);
    116.                 list.remove(i);
    117.                 break;
    118.             }
    119.             i+=1;
    120.         }
    121.         System.out.println(list);
    122.         i=0;
    123.         FileWriter fw = new FileWriter("D:\\phonenumber.txt");
    124.         while(i<list.size()){
    125.             String str = list.get(i).toString()+" "+list.get(i+1)+"\n";
    126.             System.out.println(str);
    127.             fw.write(str);
    128.             i+=2;
    129.         }
    130.         fw.flush();
    131.         fw.close();
    132.         return flat;
    133.     }
    135.     private static void add(FileOutputStream fos) throws IOException {
    136.         StringBuilder inf = new StringBuilder("");
    137.         String name = "赵六";
    138.         String num = "888888";
    139.         inf.append("\n");
    140.         inf.append(name);
    141.         inf.append(" ");
    142.         inf.append(num);
    143.         fos.write(inf.toString().getBytes());
    144.     }
    145. }