1 Employee.java
2
3 package cn.employee_io;
4
5 public class Employee {
6 private String empId;
7 private String name;
8 private int age;
9 private double salary;
10
11 public Employee() {
12 super();
13 }
14
15 public Employee(String empId, String name, int age, double salary) {
16 super();
17 this.empId = empId;
18 this.name = name;
19 this.age = age;
20 this.salary = salary;
21 }
22
23 public String getEmpId() {
24 return empId;
25 }
26
27 public void setEmpId(String empId) {
28 this.empId = empId;
29 }
30
31 public String getName() {
32 return name;
33 }
34
35 public void setName(String name) {
36 this.name = name;
37 }
38
39 public int getAge() {
40 return age;
41 }
42
43 public void setAge(int age) {
44 this.age = age;
45 }
46
47 public double getSalary() {
48 return salary;
49 }
50
51 public void setSalary(double salary) {
52 this.salary = salary;
53 }
54
55 @Override
56 public int hashCode() {
57 final int prime = 31;
58 int result = 1;
59 result = prime * result + ((empId == null) ? 0 : empId.hashCode());
60 return result;
61 }
62
63 @Override
64 public boolean equals(Object obj) {
65 if (this == obj)
66 return true;
67 if (obj == null)
68 return false;
69 if (getClass() != obj.getClass())
70 return false;
71 Employee other = (Employee) obj;
72 if (empId == null) {
73 if (other.empId != null)
74 return false;
75 } else if (!empId.equals(other.empId))
76 return false;
77 return true;
78 }
79
80 public String toString() {
81 return empId + "," + name + "," + age+ "," + salary;
82 }
83
84 }
85
1 Service.java
2
3 package cn.employee_io;
4
5 import java.io.BufferedReader;
6 import java.io.File;
7 import java.io.FileOutputStream;
8 import java.io.FileReader;
9 import java.io.IOException;
10 import java.io.ObjectInputStream;
11 import java.io.ObjectOutputStream;
12 import java.util.LinkedList;
13 import java.util.List;
14
15 public class Service {
16 List<Employee> list = new LinkedList<Employee>();
17 File file = null;
18 ObjectInputStream ois = null;
19 ObjectOutputStream oos = null;
20
21 public Service() throws IOException, ClassNotFoundException {
22 reader();
23 }
24
25 /**
26 * 读文件
27 * @throws IOException
28 * @throws ClassNotFoundException
29 */
30 public void reader() throws IOException, ClassNotFoundException {
31 /* file = new File("src/cn/employee_io/emp.txt");
32 if (!file.exists()) {
33 file.createNewFile();
34 }
35 ois = new ObjectInputStream(new FileInputStream(file));
36 list = (List<Employee>) ois.readObject(); // 给list赋值
37 ois.close();*/
38 BufferedReader br=new BufferedReader(new FileReader("src/cn/employee_io/emp.txt"));
39 String empStr=null;
40 while((empStr=br.readLine())!=null){
41 String[] empStrs=empStr.split(",");
42 list.add(new Employee(empStrs[0],empStrs[1],Integer.parseInt(empStrs[2]),Double.parseDouble(empStrs[3])));
43 }
44 br.close();
45 }
46
47 /**
48 * 写文件
49 * @throws IOException
50 * @throws ClassNotFoundException
51 */
52 public void writer() throws IOException, ClassNotFoundException {
53 file = new File("src/cn/employee_io/emp.txt");
54 if (!file.exists()) {
55 file.createNewFile();
56 }
57 oos = new ObjectOutputStream(new FileOutputStream(file));
58 for(Employee e:list){
59 oos.writeObject(e.toString()+"\r\n"); // 将list值写进文件里去
60 }
61 oos.close();
62 }
63
64 /**
65 * 添加员工
66 * @param e
67 * @throws ClassNotFoundException
68 * @throws IOException
69 */
70 public void add(Employee e) throws ClassNotFoundException, IOException {
71 if (!list.contains(e)) {
72 list.add(e);
73 writer();
74 System.out.println("添加成功！");
75 } else {
76 System.out.println("添加失败！");
77 }
78 }
79
80 /**
81 * 查询所有员工
82 */
83 public void queryAll(){
84 System.out.println("编号 "+"姓名 "+"年龄 "+"薪资");
85 for(Employee e:list){
86 System.out.println(e.getEmpId()+" "+e.getName()+" "+e.getAge()+" "+e.getSalary());
87 }
88 }
89
90 /**
91 * 查询单个员工
92 * @param empId
93 */
94 public void query(String empId){
95 for(int i=0;i<list.size();i++){
96 if(list.get(i).getEmpId().equals(empId)){
97 System.out.println("编号 "+"姓名 "+"年龄 "+"薪资");
98 System.out.println(list.get(i).getEmpId()+" "+list.get(i).getName()+" "+list.get(i).getAge()+" "+list.get(i).getSalary());
99 }
100 if((i==list.size()-1)&&(!list.get(i).getEmpId().equals(empId))){
101 System.out.println("不存在该员工！");
102 }
103 }
104 }
105
106 /**
107 * 删除员工
108 * @throws IOException
109 * @throws ClassNotFoundException
110 */
111 public void delete(String empId) throws ClassNotFoundException, IOException{
112 for(int i=0;i<list.size();i++){
113 if(list.get(i).getEmpId().equals(empId)){
114 list.remove(list.get(i));
115 writer();
116 System.out.println("删除成功！");
117 break;
118 }
119 if((i==list.size()-1)&&(!list.get(i).getEmpId().equals(empId))){
120 System.out.println("删除失败！");
121 }
122 }
123 }
124
125 /**
126 * 修改员工
127 * @throws IOException
128 * @throws ClassNotFoundException
129 *
130 */
131 public void update(Employee emp) throws ClassNotFoundException, IOException{
132 for(int i=0;i<list.size();i++){
133 if(list.get(i).getEmpId().equals(emp.getEmpId())){
134 list.get(i).setName(emp.getName());
135 list.get(i).setAge(emp.getAge());
136 list.get(i).setSalary(emp.getSalary());
137 writer();
138 System.out.println("修改成功！");
139 }
140 if((i==list.size()-1)&&(!list.get(i).getEmpId().equals(emp.getEmpId()))){
141 System.out.println("修改失败！");
142 }
143 }
144 }
145 }
1 TestEmp.java
2
3 package cn.employee_io;
4
5 import java.io.IOException;
6 import java.util.Scanner;
7
8 public class TestEmp {
9 static Scanner sc = new Scanner(System.in);
10
11 static String empId;
12 static String name;
13 static int age;
14 static double salary;
15 static int num;
16
17 public static void main(String[] args) throws ClassNotFoundException, IOException {
18 Service s=new Service();
19
20 ok: for (;;) {
21 printOptions();
22 num = sc.nextInt();
23
24 if (num < 1 || num > 6) {
25 System.out.println("输入有误，将重新开始选择！");
26 break ok;
27 }
28
29 switch (num) {
30 case 1:
31 printEmpNo();
32 printName();
33 s.add(new Employee(empId,name,age,salary));
34 break;
35 case 2:
36 s.queryAll();
37 break;
38 case 3:
39 printEmpNo();
40 s.query(empId);
41 break;
42 case 4:
43 printEmpNo();
44 s.delete(empId);
45 break;
46 case 5:
47 printEmpNo();
48 printName();
49 s.update(new Employee(empId,name,age,salary));
50 break;
51 case 6:
52 return;
53 }
54 }
55 }
56
57 public static void printOptions() {
58 System.out.println("***员工管理系统***");
59 System.out.println("1.添加员工");
60 System.out.println("2.查询所有员工");
61 System.out.println("3.查询员工");
62 System.out.println("4.删除员工");
63 System.out.println("5.修改员工");
64 System.out.println("6.退出");
65 System.out.println("请输入你要进行的操作：");
66 }
67
68 public static void printEmpNo() {
69 System.out.println("请输入员工编号：");
70 empId = sc.next();
71 }
72
73 public static void printName() {
74 System.out.println("请输入员工姓名：");
75 name = sc.next();
76 System.out.println("请输入员工年龄：");
77 age = sc.nextInt();
78 System.out.println("请输入员工薪资：");
79 salary=sc.nextDouble();
80 }
81 }
