Maven 实现学生信息管理系统

首先在pom.xml中添加jar包依赖从而导入jar包：

servlet.jar <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> mysql.jar <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> log4j.jar <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>

Main：

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 { static DBLink db = new DBLink(); public static void main(String[] args) { System.out.println("*********************************"); System.out.println("*\t\t\t\t*"); System.out.println("*\t欢迎使用学生信息管理系统\t*"); System.out.println("*\t\t\t\t*"); System.out.println("*********************************"); while (true) { menu(); } } static void menu() { System.out.println("1、添加学生信息"); System.out.println("2、删除学生信息");//学号 System.out.println("3、修改学生信息");//地址传递 System.out.println("4、查询学生信息");//name System.out.println("请输入操作，以Enter键结束:"); Scanner scanner = new Scanner(System.in); int option = scanner.nextInt(); switch (option) { case 1:{ System.out.println("添加"); System.out.println("请输入学号："); String id = scanner.next(); System.out.println("请输入姓名："); String name = scanner.next(); System.out.println("请输入手机号码："); String mobile = scanner.next(); System.out.println("请输入地址："); String address = scanner.next(); String sql = "select id from student where id = ? "; if(db.exist(sql, id)) { System.out.println("该学号已存在，请勿重复添加！"); return; } sql = "insert into student(id,name,mobile,address)values(?,?,?,?)"; if(db.update(sql, id,name,mobile,address)){ System.out.println("添加成功！"); return; } System.out.println("添加失败！"); break; } case 2:{ System.out.println("删除"); System.out.println("请输入学号："); String id = scanner.next(); String sql="delete from student where id = ?"; if(db.update(sql, id)) { System.out.println("删除成功!"); return; } System.out.println("删除失败！"); break; } case 3:{ System.out.println("修改"); System.out.println("请输入学号："); String id = scanner.next(); String sql = "select id from student where id = ?"; if(!db.exist(sql, id)) { System.out.println("该学生信息不存在，修改失败！"); return; } System.out.println("请输入新的姓名："); String name = scanner.next(); System.out.println("请输入新的号码："); String mobile = scanner.next(); System.out.println("请输入新的地址："); String address = scanner.next(); sql = "update student set name = ?,mobile = ?,address=?where id='"+id+"'"; if(db.update(sql,name,mobile,address)) { System.out.println("修改成功！"); return; } System.out.println("修改失败！"); break; } case 4:{ System.out.println("查询"); System.out.println("请输入学号："); String id = scanner.next(); String sql = "select id from student where id = ?"; if(!db.exist(sql, id)) { System.out.println("该学生信息不存在，查询失败！"); return; } sql = "select id,name,mobile,address from student where id =?"; /*class RowMapper implements IRowMapper { @Override public void rowMapper(ResultSet rs) { try { if(rs.next()) { String id = rs.getString("id"); String name = rs.getString("name"); String mobile = rs.getString("mobile"); String address = rs.getString("address"); System.out.println(id+","+name+","+mobile+","+address); } } catch (SQLException e) { e.printStackTrace(); } } }*/ /* 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); } } catch (SQLException e) { e.printStackTrace(); } }; db.select(sql,rowMapper,id);*/ 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); } } catch (SQLException e) { e.printStackTrace(); } },id); break; } default: System.out.println("I'm Sorry,there is not the "+option+" option,please try again."); } } }

DBLink：

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; public class DBLink { private Logger logger = Logger.getLogger(DBLink.class); /** * 修改功能(防止SQL注入) * *@author Administrator */ public boolean update(String sql,Object...params) { Connection connection =null; PreparedStatement preparedStatement =null; try { connection=getConnection(); preparedStatement = connection.prepareStatement(sql);//含有？占位符的sql for (int i = 0; i < params.length; i++) { preparedStatement.setObject(i+1, params[i]);//为？赋值 } return preparedStatement.executeUpdate()>0; } catch (Exception e) { logger.debug(e.getMessage(),e); } finally { close(preparedStatement,connection); } return false; } /** * 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);//获取连接 } catch (Exception e) { logger.debug(e.getMessage(),e); } return null; } /** * 查询功能 * *@author Administrator */ public void select(String sql,IRowMapper rowMapper) { Connection connection=null; Statement statement=null; ResultSet resultSet=null; try { connection=getConnection(); statement = connection.createStatement(); resultSet= statement.executeQuery(sql);//执行sql,将查询的数据存到ResultSet类型的变量中 rowMapper.rowMapper(resultSet); } catch (Exception e) { logger.debug(e.getMessage(),e); }finally { close(resultSet,statement,connection); } } /** * 查询功能 SQL注入 * *@author Administrator */ public void select(String sql,IRowMapper rowMapper,Object...params) { Connection connection=null; PreparedStatement preparedStatement =null; ResultSet resultSet=null; try { connection=getConnection(); preparedStatement = connection.prepareStatement(sql);//含有？占位符的sql for (int i = 0; i < params.length; i++) { preparedStatement.setObject(i+1, params[i]);//为？赋值 } resultSet= preparedStatement.executeQuery();//执行sql,将查询的数据存到ResultSet类型的变量中 rowMapper.rowMapper(resultSet); } catch (Exception e) { logger.debug(e.getMessage(),e); }finally { close(resultSet,preparedStatement,connection); } } /** * 判断是否存在数据 * *@author Administrator */ public boolean exist(String sql,Object...params) { Connection connection=null; PreparedStatement preparedStatement=null; ResultSet resultSet=null; try { connection=getConnection();//获取链接 preparedStatement = connection.prepareStatement(sql);//得到preparedStatement for (int i = 0; i < params.length; i++) { preparedStatement.setObject(1+i, params[i]);//为preparedStatement赋值 } resultSet= preparedStatement.executeQuery();//执行sql,将查询的数据存到ResultSet类型的变量中 return resultSet.next(); } catch (Exception e) { logger.debug(e.getMessage(),e); }finally { close(resultSet,preparedStatement,connection); } return false; } /** * 修改功能(insert,update,delete) * *@author Administrator */ public boolean update(String sql) { Connection connection=null; Statement statement=null; try { connection=getConnection(); statement = connection.createStatement(); int result = statement.executeUpdate(sql); return result>0; }catch (Exception e) { logger.debug(e.getMessage(),e); }finally { close(statement,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) { logger.debug(e.getMessage(),e); } try { if(connection!=null) { connection.close(); } } catch (SQLException e) { logger.debug(e.getMessage(),e); } } /** *释放资源 * *@author Administrator */ private void close(ResultSet resultSet,Statement statement, Connection connection) { try { if(resultSet!=null) { resultSet.close(); } } catch (SQLException e) { logger.debug(e.getMessage(),e); } close(statement, connection); } }

IRowMapper：

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

PropertiesTool：

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 void main(String [] ages) { } public static String getValue(String key) { return properties.getProperty(key); } }

db.properties:

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

log4j.propeerties:

# 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

pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.xt</groupId> <artifactId>mvn</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>mvn Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> </dependencies> <build> <finalName>mvn</finalName> </build> <profiles> <profile> <id>jdk1.8</id> <activation> <activeByDefault>true</activeByDefault> <jdk>1.8</jdk> </activation> <properties> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion> </properties> </profile> </profiles> </project>