员工管理系统（集合与IO流的结合使用 beta4.0 ObjectInputStream/ ObjectOutputStream）

 1 package cn.employee_io;
 2 
 3 import java.io.Serializable;
 4 
 5 public class Employee implements Serializable{
 6     /**
 7      * 
 8      */
 9     private static final long serialVersionUID = 1L;
10     private String empId;
11     private String name;
12     private int age;
13     private double salary;
14 
15     public Employee() {
16         super();
17     }
18 
19     public Employee(String empId, String name, int age, double salary) {
20         super();
21         this.empId = empId;
22         this.name = name;
23         this.age = age;
24         this.salary = salary;
25     }
26 
27     public String getEmpId() {
28         return empId;
29     }
30 
31     public void setEmpId(String empId) {
32         this.empId = empId;
33     }
34 
35     public String getName() {
36         return name;
37     }
38 
39     public void setName(String name) {
40         this.name = name;
41     }
42 
43     public int getAge() {
44         return age;
45     }
46 
47     public void setAge(int age) {
48         this.age = age;
49     }
50 
51     public double getSalary() {
52         return salary;
53     }
54 
55     public void setSalary(double salary) {
56         this.salary = salary;
57     }
58 
59     @Override
60     public int hashCode() {
61         final int prime = 31;
62         int result = 1;
63         result = prime * result + ((empId == null) ? 0 : empId.hashCode());
64         return result;
65     }
66 
67     @Override
68     public boolean equals(Object obj) {
69         if (this == obj)
70             return true;
71         if (obj == null)
72             return false;
73         if (getClass() != obj.getClass())
74             return false;
75         Employee other = (Employee) obj;
76         if (empId == null) {
77             if (other.empId != null)
78                 return false;
79         } else if (!empId.equals(other.empId))
80             return false;
81         return true;
82     }
83 
84     public String toString() {
85         return empId + "," + name + "," + age+ "," + salary;
86     }
87 
88 }

  1 package cn.employee_io;
  2 
  3 import java.io.File;
  4 import java.io.FileInputStream;
  5 import java.io.FileOutputStream;
  6 import java.io.IOException;
  7 import java.io.ObjectInputStream;
  8 import java.io.ObjectOutputStream;
  9 import java.util.LinkedList;
 10 import java.util.List;
 11 
 12 public class Service {
 13     List<Employee> list = new LinkedList<Employee>();
 14     File file = null;
 15     ObjectInputStream ois = null;
 16     ObjectOutputStream oos = null;
 17     boolean flag=false;
 18 
 19     public Service() throws IOException, ClassNotFoundException {
 20         reader();
 21     }
 22 
 23     /**
 24      * 读文件
 25      * @throws IOException
 26      * @throws ClassNotFoundException
 27      */    
 28     @SuppressWarnings("unchecked")
 29     public void reader() throws IOException, ClassNotFoundException {//ObjectInputStream先写后读
 30         file = new File("src/cn/employee_io/emp.txt");
 31         if (!file.exists()) {
 32             writer();
 33         }else{
 34             ois = new ObjectInputStream(new FileInputStream(file));
 35             list = (List<Employee>) ois.readObject(); // 给list赋值
 36             ois.close();
 37         }
 38     }
 39 
 40     /**
 41      * 写文件
 42      * @throws IOException
 43      * @throws ClassNotFoundException
 44      */
 45     public void writer() throws IOException, ClassNotFoundException {
 46         file = new File("src/cn/employee_io/emp.txt");
 47         oos = new ObjectOutputStream(new FileOutputStream(file));
 48         oos.writeObject(list);         
 49         oos.flush();
 50         oos.close();
 51     }
 52 
 53     /**
 54      * 添加员工
 55      * @param e
 56      * @throws ClassNotFoundException
 57      * @throws IOException
 58      */
 59     public void add(Employee e) throws ClassNotFoundException, IOException {
 60         if (!list.contains(e)) {
 61             list.add(e);
 62             writer();
 63             System.out.println("添加成功！");
 64         } else {
 65             System.out.println("添加失败！");
 66         }
 67     }
 68     
 69     /**
 70      * 查询所有员工
 71      */
 72     public void queryAll(){
 73         System.out.println("编号          "+"姓名          "+"年龄          "+"薪资");
 74         for(Employee e:list){
 75             System.out.println(e.getEmpId()+"  "+e.getName()+"  "+e.getAge()+"  "+e.getSalary());
 76         }
 77     }
 78     
 79     /**
 80      * 查询单个员工
 81      * @param empId
 82      */
 83     public void query(String empId){
 84         for(int i=0;i<list.size();i++){
 85             if(list.get(i).getEmpId().equals(empId)){
 86                 System.out.println("编号          "+"姓名          "+"年龄          "+"薪资");
 87                 System.out.println(list.get(i).getEmpId()+"  "+list.get(i).getName()+"  "+list.get(i).getAge()+"  "+list.get(i).getSalary());
 88             }
 89         }
 90     }
 91     
 92     /**
 93      * 删除员工
 94      * @throws IOException 
 95      * @throws ClassNotFoundException 
 96      */
 97     public void delete(String empId) throws ClassNotFoundException, IOException{
 98         for(int i=0;i<list.size();i++){
 99             if(list.get(i).getEmpId().equals(empId)){
100                 list.remove(list.get(i));    
101                 writer();
102                 System.out.println("删除成功！");
103                 break;
104             }
105             if((i==list.size()-1)&&(!list.get(i).getEmpId().equals(empId))){
106                 System.out.println("删除失败！");
107             }
108         }
109     }
110     
111     /**
112      * 修改员工
113      * @throws IOException 
114      * @throws ClassNotFoundException 
115      */
116     public void update(Employee emp) throws ClassNotFoundException, IOException{
117         for(int i=0;i<list.size();i++){
118             if(list.get(i).getEmpId().equals(emp.getEmpId())){
119                 list.get(i).setName(emp.getName());
120                 list.get(i).setAge(emp.getAge());
121                 list.get(i).setSalary(emp.getSalary());
122                 writer();
123                 System.out.println("修改成功！");
124             }
125             if((i==list.size()-1)&&(!list.get(i).getEmpId().equals(emp.getEmpId()))){
126                 System.out.println("修改失败！");
127             }
128         }        
129     }
130 }

 1 package cn.employee_io;
 2 
 3 import java.io.IOException;
 4 import java.util.Scanner;
 5 
 6 public class TestEmp {
 7     static Scanner sc = new Scanner(System.in);    
 8     
 9     static String empId;
10     static String name;
11     static int age;
12     static double salary;
13     static int num;
14 
15     public static void main(String[] args) throws ClassNotFoundException, IOException {
16         Service s=new Service();
17         
18         ok: for (;;) {
19             printOptions();
20             num = sc.nextInt(); 
21 
22             if (num < 1 || num > 6) {
23                 System.out.println("输入有误，将重新开始选择！");
24                 break ok;
25             }
26 
27             switch (num) {
28             case 1:
29                 printEmpNo();
30                 printName();
31                 s.add(new Employee(empId,name,age,salary));
32                 break;
33             case 2:
34                 s.queryAll();
35                 break;
36             case 3:
37                 printEmpNo();
38                 s.query(empId);
39                 break;
40             case 4:
41                 printEmpNo();
42                 s.delete(empId);
43                 break;
44             case 5:
45                 printEmpNo();
46                 printName();
47                 s.update(new Employee(empId,name,age,salary));
48                 break;
49             case 6:
50                 return;
51             }
52         }
53     }
54 
55     public static void printOptions() {
56         System.out.println("***员工管理系统***");
57         System.out.println("1.添加员工");
58         System.out.println("2.查询所有员工");
59         System.out.println("3.查询员工");
60         System.out.println("4.删除员工");
61         System.out.println("5.修改员工");
62         System.out.println("6.退出");
63         System.out.println("请输入你要进行的操作：");
64     }
65 
66     public static void printEmpNo() {
67         System.out.println("请输入员工编号：");
68         empId = sc.next();
69     }
70 
71     public static void printName() {
72         System.out.println("请输入员工姓名：");
73         name = sc.next();
74         System.out.println("请输入员工年龄：");
75         age = sc.nextInt();
76         System.out.println("请输入员工薪资：");
77         salary=sc.nextDouble();
78     }
79 }