课堂练习-增加信息

程序设计思想：

1.创建程序所需要用到的一些类，根据功能分包存放：

　　其中ClassInfo定义三个私有属性：name、teacher、place，并对它们创建get与set方法

2.在WebContent目录下建立addclass.jsp文件，在此jsp文件中添加表单，通过表单将输入的信息提交至本页面，经过本Jsp页面的处理将信息添加至数据库，并通过javascript脚本弹出提示对话框。

源程序代码如下：

DBUtil.java:

package com.jaovo.msg.Util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil {
    
    public  static  Connection getConnection() {
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
        } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        String user = "root";
        String password = "root";
        String url = "jdbc:mysql://localhost:3306/jaovo_msg";
        Connection connection = null;
        try {
             connection = DriverManager.getConnection(url,user,password);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return connection;
    }
    
    public static void close(Connection connection ) {
        try {
            if (connection != null) {
                connection.close();
            }
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void close(PreparedStatement preparedStatement ) {
        try {
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void close(ResultSet resultSet ) {
        try {
            if (resultSet != null) {
                resultSet.close();
            }
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

ClassInfo.java

package com.jaovo.msg.model;

public class ClassInfo {
    private String name;
    private String teacher;
    private String place;
    
    public ClassInfo(String name, String teacher, String place) {
        this.name = name;
        this.teacher = teacher;
        this.place = place;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getTeacher() {
        return teacher;
    }
    public void setTeacher(String teacher) {
        this.teacher = teacher;
    }
    public String getPlace() {
        return place;
    }
    public void setPlace(String place) {
        this.place = place;
    }
}

IClassDao.java:

package com.jaovo.msg.dao;

import com.jaovo.msg.model.ClassInfo;

public interface IClassDao {
    public void add(ClassInfo clas);
}

ClassDaoImpl.java:

package com.jaovo.msg.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import com.jaovo.msg.Util.DBUtil;
import com.jaovo.msg.model.ClassInfo;

public class ClassDaoImpl implements IClassDao{

    @Override
    public void add(ClassInfo clas) {
        // TODO Auto-generated method stub
        Connection con = DBUtil.getConnection();
        String sql = "insert into class_info(classname,teacher,place) value (?,?,?)";
        PreparedStatement ps = null;
        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, clas.getName());
            ps.setString(2, clas.getTeacher());
            ps.setString(3, clas.getPlace());
            ps.executeUpdate();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            DBUtil.close(ps);
            DBUtil.close(con);
        }
    }

}

运行结果截图：