程序的整体结构如下：
组长负责 Dao数据层，File文件层的操作实施。
因为Dao数据层依赖于File文件层，所以这里我们先讲File层。
File层总共分为读文件和写文件。
读文件：我们通过流式读取文件的内容，减小了程序的负载，一行一行读取文件信息。
1 public CsvReader(String filename) {
2 try {
3 reader = new BufferedReader(new InputStreamReader(new FileInputStream(filename)));
4 } catch (FileNotFoundException e) {
5 e.printStackTrace();
6 }
7 }
8
9 public String readRecord() {
10 String line = null;
11 try {
12 line = reader.readLine();
13 } catch (IOException e) {
14 e.printStackTrace();
15 }
16 return line;
17 }
写文件：写文件也是采用了流式写入，对信息进行一行一行写入。
1 public CsvWriter(String filename, boolean append) {
2 try {
3 writer = new BufferedWriter(new
4 OutputStreamWriter(new FileOutputStream(filename, append)));
5 } catch (FileNotFoundException e) {
6 e.printStackTrace();
7 }
8 }
9
10 public void writeRecord(String record) {
11 try {
12 writer.write(record);
13 } catch (IOException e) {
14 e.printStackTrace();
15 }
16 }
最后，我们在声明一个流的同时，也需要关闭一个流。
Dao层主要是对文件信息的查询，增加，删除，修改。
查询分为查询全部学生，查询单个学生。
查询单个学生：
1 @Override
2 public Student getStuByNumber(String number) {
3 Student stu = null;
4 CsvReader reader = new CsvReader(filename);
5 String lineString = null;
6 while((lineString = reader.readRecord()) != null) {
7 String[] items = lineString.split(delimiter);
8 if(items[0].equals(number))
9 stu = new Student(items[0], items[1], items[2], items[3], items[4], items[5], items[6], items[7]);
10 }
11 reader.close();
12 return stu;
13 }
14
查询全部学生：
1 @Override
2 public List<Student> getStusByCond(String cond) {
3 List<Student> students = getAllStudent();
4 List<Student> res = new ArrayList<>();
5 for(Student stu : students) {
6 if(stu.getNumber().equals(cond) || stu.getName().equals(cond) ||
7 stu.getGender().equals(cond) || stu.getAddress().contains(cond) || stu.getDormNum().equals(cond)) {
8 res.add(stu);
9 }
10 }
11 return res;
12 }
删除学生：
1 @Override
2 public int delStuByNumber(String number) {
3 List<Student> students = getAllStudent();
4 CsvWriter writer = new CsvWriter(filename, false);
5 int cnt = 0;
6 for(Student stu : students) {
7 if (!stu.getNumber().equals(number)) {
8 cnt ++;
9 writer.writeRecord(stu.toSaveString());
10 }
11 }
12 writer.close();
13 if(cnt == students.size()) return FAILED;
14 return SUCCESS;
15 }
增加学生：
1 @Override
2 public int addOneStudent(Student stu) {
3 Student student = getStuByNumber(stu.getNumber());
4 if(student == null) {
5 CsvWriter writer = new CsvWriter(filename, true);
6 writer.writeRecord(stu.toSaveString());
7 writer.close();
8 return SUCCESS;
9 }
10 return FAILED;
11 }
更新学生信息：
1 @Override
2 public int uptStuByNumber(Student stu) {
3 List<Student> students = getAllStudent();
4 CsvWriter writer = new CsvWriter(filename, false);
5 for(Student student : students) {
6 if (!student.getNumber().equals(stu.getNumber()))
7 writer.writeRecord(student.toSaveString());
8 else
9 writer.writeRecord(stu.toSaveString());
10 }
11 writer.close();
12 return SUCCESS;
13 }
组员负责的是实体类层entity层，业务层ui层；
entity层是我们写的学生信息的实体类。
1 public class Student {
2
3 // 学号
4 private String number;
5 // 姓名
6 private String name;
7 // 性别
8 private String gender;
9 // 出生日期
10 private String birth;
11 // 政治面貌
12 private String politics;
13 // 家庭住址
14 private String address;
15 // 电话
16 private String phone;
17 // 宿舍号
18 private String dormNum;
19
20 public Student() {}
21
22 public Student(String number, String name, String gender, String birth, String politics, String address, String phone,
23 String dormNum) {
24 super();
25 this.number = number;
26 this.name = name;
27 this.gender = gender;
28 this.birth = birth;
29 this.politics = politics;
30 this.address = address;
31 this.phone = phone;
32 this.dormNum = dormNum;
33 }
34
35 public String getNumber() {
36 return number;
37 }
38 public void setNumber(String number) {
39 this.number = number;
40 }
41 public String getName() {
42 return name;
43 }
44 public void setName(String name) {
45 this.name = name;
46 }
47 public String getGender() {
48 return gender;
49 }
50 public void setGender(String gender) {
51 this.gender = gender;
52 }
53 public String getBirth() {
54 return birth;
55 }
56 public void setBirth(String birth) {
57 this.birth = birth;
58 }
59 public String getPolitics() {
60 return politics;
61 }
62 public void setPolitics(String politics) {
63 this.politics = politics;
64 }
65 public String getAddress() {
66 return address;
67 }
68 public void setAddress(String address) {
69 this.address = address;
70 }
71 public String getPhone() {
72 return phone;
73 }
74 public void setPhone(String phone) {
75 this.phone = phone;
76 }
77 public String getDormNum() {
78 return dormNum;
79 }
80 public void setDormNum(String dormNum) {
81 this.dormNum = dormNum;
82 }
83
84 @Override
85 public String toString() {
86 return "Student [number=" + number + ", name=" + name + ", gender=" + gender + ", birth=" + birth
87 + ", politics=" + politics + ", address=" + address + ", phone=" + phone + ", dormNum=" + dormNum + "]";
88 }
89
90 public String toSaveString() {
91 return number + "," + name + "," + gender + "," + birth + "," + politics + "," + address + "," + phone + "," + dormNum + "\n";
92 }
93
94 }
UI层是我们实现整个GUI界面的图形布局以及程序逻辑最直观的体现。
GUI图形界面布局：
UI层程序逻辑分为展示学生信息，添加学生，删除学生，修改学生。
查询学生信息：
1 // 查询学生基本信息
2 public void actionPerformed(ActionEvent e) {
3 String cond = findText.getText();
4 if(!"".equals(cond)) fullTable(studentDao.getStusByCond(cond));
5 }
添加学生信息：
1 // 添加学生基本信息
2 public void actionPerformed(ActionEvent e) {
3 StudentAddUI dialog = new StudentAddUI();
4 dialog.setModal(true);
5 dialog.setLocationRelativeTo(null);
6 dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
7 dialog.setVisible(true);
8 }
删除学生信息：
1 // 删除学生基本信息
2 public void actionPerformed(ActionEvent e) {
3 String number = numberText.getText();
4 if("".equals(number)) {
5 JOptionPane.showMessageDialog(null, "请先选中左侧表格要删除的数据");
6 } else {
7 int flag = studentDao.delStuByNumber(number);
8 if(flag == StudentDao.SUCCESS)
9 JOptionPane.showMessageDialog(null, "学生信息删除成功");
10 else
11 JOptionPane.showMessageDialog(null, "学生信息删除失败");
12 clearForm();
13 fullTable(studentDao.getAllStudent());
14 }
15 }
修改学生信息：
1 // 修改学生基本信息
2 public void actionPerformed(ActionEvent e) {
3 // 获取输入框中的数据
4 String number = numberText.getText();
5 String name = nameText.getText();
6 String gender = (String) genderBox.getSelectedItem();
7 String birth = birthText.getText();
8 String politics = (String) politicsBox.getSelectedItem();
9 String address = addressText.getText();
10 String phone = phoneText.getText();
11 String dormNum = dormNumText.getText();
12
13 if("".equals(number) || "".equals(name) || "".equals(gender) || "".equals(birth) ||
14 "".equals(politics) || "".equals(address) || "".equals(phone) || "".equals(dormNum)) {
15 JOptionPane.showMessageDialog(null, "存在空数据，无法修改");
16 } else {
17 Student student = new Student(number, name, gender, birth, politics, address, phone, dormNum);
18 int flag = studentDao.uptStuByNumber(student);
19 if(flag == StudentDao.SUCCESS)
20 JOptionPane.showMessageDialog(null, "学生信息更新成功");
21 else
22 JOptionPane.showMessageDialog(null, "学生信息更新失败");
23 clearForm();
24 fullTable(studentDao.getAllStudent());
25 }
26 }
总结：这次项目是一个分工项目，我们两个从最初的框架制定，业务逻辑制定的冲突，到逐渐达成共识。再到具体的实施，充分感受到了一个小型项目从开发到形成成果的来之不易。
标签：return,String,number,博客,学生,stu,equals,信息管理系统,public From： https://www.cnblogs.com/poneyzxd/p/17045470.html