Java服务接口实现类

在上次实训时建立了四个对应的服务接口，并且创建了学校类的服务接口实现类，在本次实训时，我们继续建立服务接口实现类

1. 创建状态服务接口实现类StatusServiceImpl

在service的子包impl中建立该实现类：

详细代码为：

对StatusServiceImpl进行单元测试

在test包中创建测试类：

（1）编写测试方法testFindStatusById()

代码如下：

运行结果为：

（2）编写测试方法testUpdateStatus()

运行结果为：

2.创建学生服务接口实现类

详细代码为：

package net.lyq.student.service.impl;import net.lyq.student.bean.Student;
import net.lyq.student.dao.StudentDao;
import net.lyq.student.dao.impl.StudentDaoImpl;
import net.lyq.student.service.StudentService;import java.util.List;
import java.util.Vector;public class StudentServiceImpl implements StudentService {private StudentDao studentDao = new StudentDaoImpl();@Overridepublic int addStudent(Student student) {return studentDao.insert(student);}@Overridepublic int deleteStudentById(String id) {return studentDao.deleteById(id);}@Overridepublic int deleteStudentsByClass(String clazz) {return studentDao.deleteByClass(clazz);}@Overridepublic int deleteStudentsByDepartment(String department) {return studentDao.deleteByDepartment(department);}@Overridepublic int updateStudent(Student student) {return studentDao.update(student);}@Overridepublic Student findStudentById(String id) {return studentDao.findById(id);}@Overridepublic List<Student> findStudentByName(String name) {return studentDao.findByName(name);}@Overridepublic List<Student> findStudentsByClass(String clazz) {return studentDao.findByClass(clazz);}@Overridepublic List<Student> findStudentsByDepartment(String department) {return studentDao.findByDepartment(department);}@Overridepublic List<Student> findAllStudents() {return studentDao.findAll();}@Overridepublic Vector findRowsBySex() {return studentDao.findRowsBySex();}@Overridepublic Vector findRowsByClass() {return studentDao.findRowsByClass();}@Overridepublic Vector findRowsByDepartment() {return studentDao.findRowsByDepartment();}
}

对StudentServiceImpl进行单元测试

（1）编写测试方法testFindStudentsByName()

(2)编写测试方法testAddStudent()

运行结果：

（3）编写测试方法testDeleteStudentById()

运行结果：

数据表：

（4）编写测试方法testDeleteStudentsByClass()

（5）编写测试方法testDeleteStudentsByDepartment()

（6）编写测试方法testUpdateStudent()

（7）编写测试方法testFindStudentById()

（8）编写测试方法testFindAllStudents()

（9）编写测试方法testFindStudentsByClass()

（10）编写测试方法testFindStudentsByDepartment()

（11）编写测试方法testFindRowsBySex()

（12）编写测试方法testFindRowsByClass()

（13）编写测试方法testFindRowsByDepartment()

3.创建用户服务接口实现类

package net.lyq.student.service.impl;import net.lyq.student.bean.User;
import net.lyq.student.dao.UserDao;
import net.lyq.student.dao.impl.UserDaoImpl;
import net.lyq.student.service.UserService;import java.util.List;public class UserServiceImpl implements UserService {/*** 声明用户数据访问对象*/private UserDao userDao = new UserDaoImpl();@Overridepublic int addUser(User user) {return userDao.insert(user);}@Overridepublic int deleteUserById(int id) {return userDao.deleteById(id);}@Overridepublic List<User> findAllUsers() {return userDao.findAll();}@Overridepublic User findUserById(int id) {return userDao.findById(id);}@Overridepublic User login(String username, String password) {return userDao.login(username, password);}@Overridepublic int updateUser(User user) {return userDao.update(user);}@Overridepublic boolean isUsernameExisted(String username) {return userDao.isUsernameExisted(username);}
}

对UserServiceImpl进行单元测试

(1)编写测试方法testLogin()

运行结果：

（2）编写测试方法testIsUsernameExisted()

运行结果：

修改用户名即可改变运行结果

（3）编写测试方法testAddUser()

运行结果：

（4）编写测试方法testDeleteUserById()

运行结果：

（5）编写测试方法testUpdateUser()

运行结果：

（6）编写测试方法testFindUserById()

运行结果：

（7）编写测试方法testFindAllUsers()

运行结果：

以上为所有服务接口类的所有测试类

创建应用程序类

在net.lyq.student包里创建app子包,并创建Application类



在类中编写如图所示代码，发生错误，是由于该三个窗口为还未进行创建
创建gui包用来存放三个窗口类

创建结束以后，再次查看Application

创建窗口界面

上文提到，创建如图所示的三个窗口，接下来就可以进行窗口类的编写

1、创建主界面窗口MainFrame

package net.lyq.student.gui;import net.lyq.student.app.Application;
import net.lyq.student.bean.Status;
import net.lyq.student.service.StatusService;
import net.lyq.student.service.impl.StatusServiceImpl;import javax.swing.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;public class MainFrame extends JFrame {/*** 构造方法* @param title*/public MainFrame(String title){super(title);initGUI();}private Status status;//状态对象private StatusService statusService;//状态服务对象/*** 初始化图形界面*/public void initGUI(){//创建状态服务对象statusService = new StatusServiceImpl();//获取状态对象status = statusService.findStatusById(1);//设置窗口尺寸setSize(800,640);//设置窗口可见setVisible(true);setLocationRelativeTo(null);//设置窗口标题setTitle("学生信息管理系统"+status.getVersion());//设置窗口默认关闭方式
//        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//注册窗口监听器，创建窗口适配器，编写事件处理代码addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {exitSystem();}});}/*** 退出系统，询问用户是否退出*/private void exitSystem() {int choice = JOptionPane.showConfirmDialog(this,"您是否要退出系统","学生信息管理系统",JOptionPane.YES_NO_OPTION);if (choice == JOptionPane.YES_NO_OPTION){System.exit(0);}else{//卸载当前窗口dispose();//重新显示主窗口Application.mainFrame = new MainFrame("学生信息管理系统"+status.getVersion());}}public static void main(String[] args) {Application.mainFrame = new MainFrame("");}
}

2.创建用户登录窗口LoginFrame

package net.lyq.student.gui;import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;import net.lyq.student.app.Application;
import net.lyq.student.bean.Status;
import net.lyq.student.bean.User;
import net.lyq.student.service.StatusService;
import net.lyq.student.service.UserService;
import net.lyq.student.service.impl.StatusServiceImpl;
import net.lyq.student.service.impl.UserServiceImpl;public class LoginFrame extends JFrame{private String username;private String password;private JLabel lblUsername;private JLabel lblPassword;private JTextField txtUsername;private JPasswordField txtPassword;private JButton btnOK;private JButton btnCancel;private JButton btnRegister;private JPanel panel,panel1,panel2,panel3;public LoginFrame(String title) {super(title);initGUI();}private void initGUI() {panel = (JPanel) getContentPane();panel1 = new JPanel();panel2 = new JPanel();panel3 = new JPanel();lblUsername = new JLabel("用户名:");lblPassword = new JLabel("密码:");txtUsername = new JTextField(15);txtPassword = new JPasswordField(15);btnOK = new JButton("确定");btnCancel = new JButton("取消");btnRegister = new JButton("注册");panel1.add(lblUsername);panel1.add(txtUsername);panel2.add(lblPassword);panel2.add(txtPassword);panel3.add(btnOK);panel3.add(btnCancel);panel3.add(btnRegister);panel.setLayout(new GridLayout(3,1));panel.add(panel1);panel.add(panel2);panel.add(panel3);btnOK.setMnemonic(KeyEvent.VK_O);btnCancel.setMnemonic(KeyEvent.VK_C);btnRegister.setMnemonic(KeyEvent.VK_R);txtPassword.setEchoChar('*');setSize(250, 200);setLocationRelativeTo(null);setResizable(false);pack();setVisible(true);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);btnOK.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stublogin();}});btnOK.addKeyListener(new KeyAdapter() {@Overridepublic void keyPressed(KeyEvent e) {if (e.getKeyCode() == KeyEvent.VK_ENTER) {login();}}});txtUsername.addKeyListener(new KeyAdapter() {public void keyPressed(KeyEvent e) {if (e.getKeyCode() == KeyEvent.VK_ENTER)txtUsername.requestFocus();}});txtPassword.addKeyListener(new KeyAdapter() {public void keyPressed(KeyEvent e) {if (e.getKeyCode() == KeyEvent.VK_ENTER)txtPassword.requestFocus();}});btnCancel.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubSystem.exit(0);}});btnRegister.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubApplication.loginFrame.setVisible(false);Application.registerFrame = new RegisterFrame("用户注册");}});}private void login() {username = txtUsername.getText().trim();password = new String(txtPassword.getPassword());UserService userService = new UserServiceImpl();User user = userService.login(username, password);if (user != null) {Application.loginFrame.setVisible(false);StatusService statusService = new StatusServiceImpl();Status status = statusService.findStatusById(1);Application.id = user.getId();Application.username = user.getUsername();Application.password = user.getPassword();JOptionPane.showMessageDialog(null, "欢迎使用学生信息管理系统" + status.getVersion(),"用户登录",JOptionPane.INFORMATION_MESSAGE);Application.mainFrame = new MainFrame("");Application.loginFrame.dispose();}else {Application.loginFrame.setVisible(false);JOptionPane.showMessageDialog(null, "用户名或密码错误，请重新输入","用户登录",JOptionPane.ERROR_MESSAGE);Application.loginFrame.setVisible(true);txtUsername.selectAll();txtPassword.selectAll();txtUsername.requestFocus();}}public static void main(String[] args) {Application.loginFrame = new LoginFrame("用户登录");}
}

该代码中，RegisterFrame会出现错误，需要对该类进行修改