java纯手写利用poi读取xls文件，并通过JDBC存入MySQL数据库

前提：
手头有一份我们班的资料，然后要供大家随时查到各自的消息。需要存入到数据库供使用。，于是手写了几段代码，哪里可以优化，希望各位大佬指点。
 
创建学生对象：

package com.cn.poi.xieyi;
 
public class Student {
     
    private String gender;
    private String className;
    private String address;
    private String telNum;
    private String IDNum;
    private String  xuehao;
    private String name;
     
    public String getXuehao() {
        return xuehao;
    }
    public void setXuehao(String xuehao) {
        this.xuehao = xuehao;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public String getClassName() {
        return className;
    }
    public void setClassName(String className) {
        this.className = className;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getTelNum() {
        return telNum;
    }
    public void setTelNum(String telNum) {
        this.telNum = telNum;
    }
    public String getIDNum() {
        return IDNum;
    }
    public void setIDNum(String iDNum) {
        IDNum = iDNum;
    }
    @Override
    public String toString() {
        return "Student [gender=" + gender + ", className=" + className
                + ", address=" + address + ", telNum="
                + telNum + ", IDNum=" + IDNum + ", xuehao=" + xuehao
                + ", name=" + name + "]";
    }
     
     
     
     
     
     
     
 
}

然后主代码，很混乱，因为是自己看，写的超级乱。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。

package com.cn.poi.xieyi;
import java.io.FileInputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Cell;
 
public class Main {
    private static POIFSFileSystem fs;//poi文件流
    private static HSSFWorkbook wb;//获得execl
    private static HSSFRow row;//获得行
    private static HSSFSheet sheet;//获得工作簿
 
     
     
    public static void main(String[] args) throws Exception {
        //加载文件的位置
        InputStream in= new FileInputStream("D:\\笔记\\15机电工程协议书号.xls");
         
        readXlsx(in);
         
    }
     
    public static void readXlsx(InputStream in){
         
        List list = new ArrayList<>();
         
        try {
             fs = new POIFSFileSystem(in);
             wb = new HSSFWorkbook(fs);
             sheet=wb.getSheetAt(0);
             //int rowfirst=sheet.getFirstRowNum();
             int rowend=sheet.getLastRowNum();//获取最后一行
              
             /**
              * 获取每一行
              */
             for (int i = 0; i <=rowend; i++) {
                row=sheet.getRow(i);
                 
                 
               // int colNum = row.getPhysicalNumberOfCells();//一行总列数
                Student s = new Student();
                for(int j = 0; j<11;j++){
                    if( row.getCell(j) != null){
                        row.getCell(j).setCellType(Cell.CELL_TYPE_STRING);
                        String xuehao = row.getCell(j).getStringCellValue();
                         
                        /**
                         * 根据每次循环获取到的内容不同，设置给student对象的各个属性
                         */
                        switch (j) {
                        case 2:
                            s.setXuehao(xuehao);
                            break;
                        case 3:
                            s.setName(xuehao);
                        case 4:
                            s.setGender(xuehao);
                        case 5 :
                            s.setClassName(xuehao);
                        case 6 :
                            s.setAddress(xuehao);
                        case 8 :
                            s.setTelNum(xuehao);
                        case 9 :
                            s.setIDNum(xuehao);
                        }
                    }
                }
                System.out.println(s);
                 
                /**
                 * 发送到数据库
                 */
                send(s);
                 
                //添加到list中方便后续使用
                //list.add(s);
            }
          }catch (Exception e) {
             e.printStackTrace();
         }
    }
     
    /**
     * 发送数据库的实现方法
     * @param s
     */
    public static void send(Student s) {
         
        String sql = "insert into student (xuehao,name,gender,class_name,address,tel_num,ID_card) values (?,?,?,?,?,?,?)";
        Connection conn =null;
        PreparedStatement pstmt = null;
        //加载驱动
        try {
            Class.forName("com.mysql.jdbc.Driver") ;
             String url = "jdbc:mysql://localhost:3306/student_list" ;    
             String username = "root" ;   
             String password = "root" ;   
             
            //连接数据库
            conn = DriverManager.getConnection(url , username , password ) ;
            pstmt = conn.prepareStatement(sql);
            
            //设置参数
            pstmt.setString(1, s.getXuehao());
            pstmt.setString(2, s.getName());
            pstmt.setString(3, s.getGender());
            pstmt.setString(4, s.getClassName());
            pstmt.setString(5, s.getAddress());
            pstmt.setString(6, s.getTelNum());
            pstmt.setString(7, s.getIDNum());
             
            //执行sql被影响的条数
           // int i = pstmt.executeUpdate();
             
           // System.out.println(i);
             
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            //关闭一些东西
            if(pstmt != null){
                try {
                    pstmt.close();
                    if(conn != null){
                        conn.close();
                    }
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

 

 

maven依赖：

    
        org.apache.poi
        poi
        3.17
    
     
     
     
    
     
    
        mysql
        mysql-connector-java
        5.1.23