使用maven工具----实现JDBC学生管理系统

项目结构Main.javaToolDBLink.javaIRowMapper.javaProperties.java Propertiesdb.propertieslog4j.properties jar包1、junit2、javax.servlet3、mysql4、log4j

项目结构

Main.java

package com.zzu.client; import java.sql.ResultSet; import java.sql.SQLException; import java.util.Scanner; import com.zzu.tool.db.DBLink; import com.zzu.tool.db.IRowMapper; public class Main { public static void main(String[] args) { System.out.println("*********************************"); System.out.println("*\t\t\t\t*"); System.out.println("*\t学生管理系统\t*"); System.out.println("*\t\t\t\t*"); System.out.println("*********************************"); while (true) { menu(); } } static void menu() { //DBLink db = new DBLink(); System.out.println("1添加学生信息"); System.out.println("2修改学生信息"); System.out.println("3查询学生信息");//地址传递 System.out.println("4删除学生信息");//name System.out.println("请输入Enter键以继续"); final Scanner scanner = new Scanner(System.in); int option = scanner.nextInt(); switch (option) { case 1:{ System.out.println("添加系统"); System.out.println("请输入学号"); String id = scanner.next(); String sql = "select id from student where id = ?"; if(new DBLink().exist(sql,id)) { System.out.println("学号已存在，添加失败"); return; } System.out.println("请输入姓名"); String name = scanner.next(); System.out.println("请输入电话"); String mobile = scanner.next(); System.out.println("请输入地址"); String address = scanner.next(); sql = "insert into student (id,name,mobile,address) values (?,?,?,?)"; if(new DBLink().update(sql,id, name,mobile,address)) { System.out.println("添加成功"); break; } System.out.println("添加失败"); break; } case 2:{ System.out.println("修改系统"); System.out.println("请输入学号"); String id = scanner.next(); String sql = "select id from student where id = ?"; if(new DBLink().exist(sql,id)) { System.out.println("请输入新姓名"); String name = scanner.next(); System.out.println("请输入新电话"); String mobile = scanner.next(); System.out.println("请输入新地址"); String address = scanner.next(); sql = "update student set name = ?, mobile = ?,address = ? where id = ?"; if(new DBLink().update(sql, name,mobile,address,id)) { System.out.println("修改成功"); break; } } System.out.println("没有找到学号为"+id+"的学生,请检查学号是否错误"); break; } case 3:{ System.out.println("欢迎使用查询系统"); System.out.println("请输入学号"); String id = scanner.next(); String sql = "select id,name,mobile,address from student where id = ?"; class RowMapper implements IRowMapper{ public void IRowMapper(ResultSet rs) { try { if(rs.next()) { String name = rs.getString("name"); String mobile = rs.getString("mobile"); String address = rs.getString("address"); System.out.println(id+","+name+","+mobile+","+address); return; } System.out.println("没有找到学生信息"); } catch (SQLException e) { e.printStackTrace(); } } } IRowMapper rowMapper = new RowMapper(); new DBLink().select(sql,rowMapper,id); /*IRowMapper rowMapper = (rs)->{ try { if(rs.next()) { String name = rs.getString("name"); String mobile = rs.getString("mobile"); String address = rs.getString("address"); System.out.println(id+","+name+","+mobile+","+address); return; } System.out.println("没有找到学生信息"); } catch (SQLException e) { e.printStackTrace(); } };*/ /*db.select(sql, (rs)->{ try { if(rs.next()) { String name = rs.getString("name"); String mobile = rs.getString("mobile"); String address = rs.getString("address"); System.out.println(id+","+name+","+mobile+","+address); return; } System.out.println("没有找到学生信息"); } catch (SQLException e) { e.printStackTrace(); } }, id);*/ break; } case 4:{ System.out.println("欢迎使用删除系统"); System.out.println("请输入学号"); String id = scanner.next(); String sql = "select id from student where id = ?"; if(new DBLink().exist(sql,id)) { sql = "delete from student where id = ?"; new DBLink().update(sql,id); System.out.println("删除成功"); break; } System.out.println("未找到学号为'"+id+"'的学生,删除失败"); break; } default: System.out.println("I'm Sorry,there is not the "+option+" option,please try again."); } } }

Tool

DBLink.java

package com.zzu.tool.db; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import org.apache.log4j.Logger; import com.zzu.tool.PropertiesTool; /** * 数据库管理工具类 * * @author Administrator */ public class DBLink { private Logger logger = Logger.getLogger(DBLink.class); /** * 获取数据库连接 * * @author Administrator */ private Connection getConnection() { try { Class.forName("com.mysql.jdbc.Driver");//加载驱动 String userName = PropertiesTool.getvalue("db.username"); String password = PropertiesTool.getvalue("db.password"); String url = PropertiesTool.getvalue("db.url"); return DriverManager.getConnection(url, userName, password);//创建连接 } catch (Exception e) { logger.debug(e.getMessage(), e); } return null; } /** * 查询数据 * * @author Administrator */ public void select(String sql,IRowMapper rowMapper,Object...params) {//接口无法创建对象，所以rowMapper参数一定指向IRowMapper接口实现类对象 Connection connection = null; PreparedStatement preparedStatement = null; ResultSet resultSet = null; try { connection = getConnection();//创建连接 preparedStatement = connection.prepareStatement(sql);//创建语句 for (int i = 0; i < params.length; i++) { preparedStatement.setObject(i+1, params[i]); } resultSet = preparedStatement.executeQuery();//executeQuery()方法会把数据库响应的查询结果存放在ResultSet类对象中供我们使用 rowMapper.IRowMapper(resultSet);//因为rowMapper参数指向IRowMapper接口实现类对象，所以此处将调用接口实现类中所实现的rowMapper方法 多态 } catch (Exception e) { logger.debug(e.getMessage(), e); }finally { close(resultSet,preparedStatement,connection); } } /** * 修改（insert，update和delete）数据 * * @author Administrator */ public boolean update(String sql) { Connection connection = null;//提升作用域 Statement statement = null; try { connection = getConnection(); statement = connection.createStatement(); int result = statement.executeUpdate(sql);//执行SQL语句，返回受影响的语句行数 //statement.close();//如果前面代码出错，下面代码将会不执行，所以不能写在这里 //connection.close(); return result>0; } catch (Exception e) { logger.debug(e.getMessage(), e); }finally { close(statement,connection); } return false; } /** * 修改（insert，update和delete）数据 * * @author Administrator */ public boolean update(String sql,Object...params) { Connection connection = null; PreparedStatement preparedstatement = null; try { connection = getConnection(); preparedstatement = connection.prepareStatement(sql); for (int i = 0; i < params.length; i++) { preparedstatement.setObject(i+1, params[i]); } return preparedstatement.executeUpdate()>0; } catch (Exception e) { logger.debug(e.getMessage(), e); }finally { close(preparedstatement,connection); } return false; } /** * 判断SQL语句是否能查出数据 * * @author Administrator */ public boolean exist(String sql,Object...params) {//查询 Connection connection = null; PreparedStatement preparedStatement = null; ResultSet resultSet = null; try { connection = getConnection();//获取连接 preparedStatement = connection.prepareStatement(sql);//创建语句 for (int i = 0; i < params.length; i++) { preparedStatement.setObject(i+1, params[i]);//为占位符传值 } resultSet = preparedStatement.executeQuery(); return resultSet.next();//判断是否有值 } catch (Exception e) { logger.debug(e.getMessage(), e); }finally { close(resultSet,preparedStatement,connection); } return false; } /** * 释放资源 * * @author Administrator */ private void close(Statement statement,Connection connection) { try { if(statement!=null) { statement.close(); } } catch (SQLException e) { e.printStackTrace(); } try { if(connection!=null) { connection.close(); } } catch (SQLException e) { e.printStackTrace(); } } /** * 释放资源 * * @author Administrator */ private void close(ResultSet resultSet,Statement statement,Connection connection) {//方法的重载 try { if(resultSet!=null) { resultSet.close(); } } catch (SQLException e) { e.printStackTrace(); } close(statement,connection); } }

IRowMapper.java

package com.zzu.tool.db; import java.sql.ResultSet; public interface IRowMapper { void IRowMapper(ResultSet rs); }

Properties.java

package com.zzu.tool; import java.io.IOException; import java.io.InputStream; import java.util.Properties; public class PropertiesTool { private static Properties properties = new Properties(); static { InputStream inputStream = PropertiesTool.class.getClassLoader().getResourceAsStream("db.properties");//将db.properties变为javaIO流对象 try { properties.load(inputStream); } catch (IOException e) { e.printStackTrace(); } } public static String getvalue(String key) { return properties.getProperty(key); } }

Properties

db.properties

db.username=root db.password=root db.url=jdbc:mysql://localhost:3306/test

log4j.properties

# DEBUG\u8BBE\u7F6E\u8F93\u51FA\u65E5\u5FD7\u7EA7\u522B\uFF0C\u7531\u4E8E\u4E3ADEBUG\uFF0C\u6240\u4EE5ERROR\u3001WARN\u548CINFO \u7EA7\u522B\u65E5\u5FD7\u4FE1\u606F\u4E5F\u4F1A\u663E\u793A\u51FA\u6765 log4j.rootLogger=DEBUG,Console,RollingFile #\u5C06\u65E5\u5FD7\u4FE1\u606F\u8F93\u51FA\u5230\u63A7\u5236\u53F0 log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.PatternLayout log4j.appender.Console.layout.ConversionPattern= [%-5p]-[%d{yyyy-MM-dd HH:mm:ss}] -%l -%m%n #\u5C06\u65E5\u5FD7\u4FE1\u606F\u8F93\u51FA\u5230\u64CD\u4F5C\u7CFB\u7EDFD\u76D8\u6839\u76EE\u5F55\u4E0B\u7684log.log\u6587\u4EF6\u4E2D log4j.appender.RollingFile=org.apache.log4j.DailyRollingFileAppender log4j.appender.RollingFile.File=D://log.log log4j.appender.RollingFile.layout=org.apache.log4j.PatternLayout log4j.appender.RollingFile.layout.ConversionPattern=%d [%t] %-5p %-40.40c %X{traceId}-%m%n

jar包

1、junit

<dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency>

2、javax.servlet

<dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency>

3、mysql

<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.42</version> </dependency>

4、log4j

<dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>