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<td><b><big>课程培训</big></b></td>
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<td><b>共108种课程内容</b></td>
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<div align="center">书名：XXX</div>
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学生管理系统
Utils
public class DBUtils {
private static final Properties PROPERTIES = new Properties();
//为当前线程绑定一个Connection连接。从头到尾
private static final ThreadLocal<Connection> THREAD_LOCAL = new ThreadLocal<Connection>();
static {
InputStream is = DBUtils.class.getResourceAsStream("/db.properties");
try {
PROPERTIES.load(is);
Class.forName(PROPERTIES.getProperty("driver"));
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
//获取连接
public static Connection getConnection() {
//在ThreadLocal里取
Connection connection = THREAD_LOCAL.get();
try {
//没有 ，新建
if (connection == null) {
connection = DriverManager.getConnection(PROPERTIES.getProperty("url"), PROPERTIES.getProperty("username"), PROPERTIES.getProperty("password"));
THREAD_LOCAL.set(connection);//存在ThreadLocal里
}
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
//开启事务
public static void begin() {
Connection connection = getConnection();
try {
connection.setAutoCommit(false);
} catch (SQLException e) {
e.printStackTrace();
}
}
//提交事务
public static void commit() {
Connection connection = getConnection();
try {
connection.commit();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtils.closeAll(connection, null, null);
}
}
//回滚事务
public static void rollback() {
Connection connection = getConnection();
try {
connection.rollback();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtils.closeAll(connection, null, null);
}
}
//释放资源
public static void closeAll(Connection connection, Statement statement, ResultSet resultSet) {
try {
if (resultSet != null) {
resultSet.close();
}
if (statement != null) {
statement.close();
}
if (connection != null) {
connection.close();
THREAD_LOCAL.remove();//关闭连接后，移除线程中绑定的连接对象。
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public class DateUtils {
private static final SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
//字符串转Util
public static java.util.Date strToUtilDate(String str) {
try {
return simpleDateFormat.parse(str);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
//util转sql
public static java.sql.Date utilToSql(java.util.Date date) {
return new java.sql.Date(date.getTime());
}
}
public class DaoUtils<T> {
/**
* 增删改方法
*/
public int commonsUpdate(String sql, Object... args) {
Connection connection = null;
PreparedStatement preparedStatement = null;
try {
connection = DBUtils.getConnection();
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < args.length; i++) {
preparedStatement.setObject(i + 1, args[i]);
}
return preparedStatement.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
} finally {
DBUtils.closeAll(null, preparedStatement, null);
}
return 0;
}
/**
* 查一个或查多个
*/
public List<T> commonsSelect(String sql, RowMapper<T> rowMapper, Object... args) {
List<T> elements = new ArrayList<T>();
Connection connection = null;
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
try {
connection = DBUtils.getConnection();
preparedStatement = connection.prepareStatement(sql);
if(args!=null){
for (int i = 0; i < args.length; i++) {
preparedStatement.setObject(i + 1, args[i]);
}
}
resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
elements.add(rowMapper.getRow(resultSet));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtils.closeAll(null, preparedStatement, resultSet);
}
return elements;
}
}
entity
public class Student {
private int id;
private String name;
private String password;
private String sex;
private Date borndate;
private String phone;
public Student() {
}
public Student(int id, String name, String password, String sex, Date borndate, String phone) {
this.id = id;
this.name = name;
this.password = password;
this.sex = sex;
this.borndate = borndate;
this.phone = phone;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBorndate() {
return borndate;
}
public void setBorndate(Date borndate) {
this.borndate = borndate;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return
"学号：" + id +
", 学生姓名：" + name +
", 密码：" + password +
", 性别：" + sex +
", 出生日期：" + borndate +
", 电话：" + phone;
}
}
dao
import java.util.List;
public class StudentDaoImpl implements StudentDao {
DaoUtils<Student> daoUtil = new DaoUtils<Student>();
@Override
public int insert(Student stu) {
String sql = "insert into t_student(id,name,password,sex,borndate,Phone) values(?,?,?,?,?,?);";
return daoUtil.commonsUpdate(sql,new Object[]{stu.getId(),stu.getName(),stu.getPassword(),stu.getSex(), DateUtils.utilToSql(stu.getBorndate()),stu.getPhone()});
}
@Override
public int update(Student stu) {
String sql = "update t_student set name = ?,password = ?,sex = ?,borndate = ?,Phone = ? where id = ?;";
return daoUtil.commonsUpdate(sql,new Object[]{stu.getName(),stu.getPassword(),stu.getSex(), DateUtils.utilToSql(stu.getBorndate()),stu.getPhone(),stu.getId()});
}
@Override
public int delete(int id) {
String sql = "delete from t_student where id = ?;";
return daoUtil.commonsUpdate(sql,id);
}
@Override
public Student select(int id) {
List<Student> list = daoUtil.commonsSelect("select * from t_student where id = ?;",new StudentRowMapper(),id);
if (list != null) {
return list.get(0);
}
return null;
}
@Override
public List<Student> selectAll() {
String sql = "select * from t_student";
return daoUtil.commonsSelect(sql,new StudentRowMapper(),new Object[]{});
}
}
public interface StudentDao {
int insert(Student student);
int update(Student student);
int delete(int id);
Student select(int id);
List<Student> selectAll();
}
service
public class StudentServiceImpl implements StudentService {
private Connection connection = null;
private PreparedStatement preparedStatement = null;
private ResultSet resultSet = null;
private StudentDao studao = new StudentDaoImpl();
@Override
public String insert() {
String result = "注册失败";
try {
DBUtils.begin();
Student stu = getStudent();
int i = studao.insert(stu);
if (i > 0) {
DBUtils.commit();
result = "注册成功";
}
} catch (Exception e) {
DBUtils.rollback();
}
return result;
}
@Override
public String delete(int id) {
String result = "删除失败";
try {
DBUtils.begin();
int i = studao.delete(id);
if (i > 0) {
DBUtils.commit();
result = "删除成功";
}
} catch (Exception e) {
DBUtils.rollback();
}
return result;
}
@Override
public String update(int id) {
String result = "更新失败";
try {
DBUtils.begin();
Student checkstu = studao.select(id);
if (checkstu == null) {
throw new RuntimeException("目标id不存在");
}
Student stu = getStudent();
stu.setId(checkstu.getId());
int i = studao.update(stu);
if (i > 0) {
DBUtils.commit();
result = "更新成功";
}
} catch (Exception e) {
DBUtils.rollback();
}
return result;
}
@Override
public String login(int id, String password) {
String result = "登录失败";
try {
DBUtils.begin();
Student stu = studao.select(id);
if (stu == null) {
throw new RuntimeException("用户名错误");
}
if (stu.getPassword().equals(password)) {
DBUtils.commit();
result = "登陆成功";
} else {
result = "密码不正确";
}
} catch (Exception e) {
DBUtils.rollback();
}
return result;
}
@Override
public String showStudent(int id) {
String result = "查询失败";
try {
DBUtils.begin();
Student stu = studao.select(id);
if (stu != null) {
DBUtils.commit();
return stu.toString();
}
} catch (Exception e) {
DBUtils.rollback();
}
return result;
}
@Override
public String showAllStudent() {
String result = "查询失败";
try {
DBUtils.begin();
List<Student> list = studao.selectAll();
if (list != null) {
DBUtils.commit();
for (Student stu : list) {
System.out.println(stu.toString());
}
result = "查询完毕";
}
} catch (Exception e) {
DBUtils.rollback();
}
return result;
}
@Override
public Student getStudent() {
Student stu = new Student();
Scanner sc = new Scanner(System.in);
System.out.println("请输入姓名");
stu.setName(sc.next());
System.out.println("请输入密码");
stu.setPassword(sc.next());
System.out.println("请输入性别（男/女）");
stu.setSex(sc.next());
System.out.println("请输入生日(格式：yyyy-MM-dd)");
stu.setBorndate(DateUtils.strToUtilDate(sc.next()));
System.out.println("请输入手机号");
stu.setPhone(sc.next());
return stu;
}
}
public interface StudentService {
public String insert();
public String delete(int id);
public String update(int id);
public String login(int id , String password);
public String showStudent(int id);
public String showAllStudent();
public Student getStudent();
}
test
public class TestStudent {
public static void main(String[] args) {
StudentService s = new StudentServiceImpl();
int choice = 0;
do {
System.out.println("1.添加学生 2.删除学生 3.修改学生信息 4.学生登陆 5.查询单个学生 6.查询所有学生 0.退出");
Scanner sc = new Scanner(System.in);
choice = sc.nextInt();
switch (choice){
case 1:
System.out.println(s.insert());
break;
case 2:
System.out.println("请输入id");
System.out.println(s.delete(sc.nextInt()));
break;
case 3:
System.out.println("请输入id");
System.out.println(s.update(sc.nextInt()));
break;
case 4:
System.out.println("请输入id");
int id = sc.nextInt();
System.out.println("请输入密码");
String password = sc.next();
System.out.println(s.login(id,password));
break;
case 5:
System.out.println("请输入id");
System.out.println(s.showStudent(sc.nextInt()));
break;
case 6:
System.out.println(s.showAllStudent());
break;
case 0:
break;
}
}while (choice != 0);
System.out.println("退出系统");
}
}
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