Java处理数据 —— 从Excel导入到数据库，从数据库导出到Excel表中

任务：

1. 把存储在在Excel中的多条User类数据导入到目标数据库
2. 把存储在在数据库中的多条User类数据导出到Excel表格

准备阶段：

• 配置了Mysql数据库
• 编译器导入了 jxl.jar 包，Excel表格处理包
• 编译器导入了 sql.jar 包，Mysql包

全部代码如下：

JavaBean类（User类）：

package sample;

/**
 * User账号类
 */
public class User {
    
    

    private String userName;
    private String password;
    private String sex;
    private String address;
    private String tel;
    private int flowerSum;
    private String time;


   public User(){
    
    }

   public User(String userName,String password){
    
    
       this.userName = userName;
       this.password = password;
   }
   public User(String userName,String password,String sex,String address,String tel,int flowerSum,String time){
    
    
       this(userName, password);
       this.sex = sex;
       this.address = address;
       this.tel = tel;
       this.flowerSum = flowerSum;
       this.time =time;
   }

   //setter和getter方法，要是没写无法读入tableView
    public String getUserName() {
    
    
        return userName;
    }

    public void setUserName(String userName) {
    
    
        this.userName = userName;
    }

    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 String getAddress() {
    
    
        return address;
    }

    public void setAddress(String address) {
    
    
        this.address = address;
    }

    public String getTel() {
    
    
        return tel;
    }

    public void setTel(String tel) {
    
    
        this.tel = tel;
    }

    public int getFlowerSum() {
    
    
        return flowerSum;
    }

    public void setFlowerSum(int flowerSum) {
    
    
        this.flowerSum = flowerSum;
    }

    public String getTime() {
    
    
        return time;
    }

    public void setTime(String time) {
    
    
        this.time = time;
    }

    @Override
    public String toString() {
    
    
        return "User{" +
                "userName='" + userName + '\'' +
                ", password='" + password + '\'' +
                ", sex='" + sex + '\'' +
                ", address='" + address + '\'' +
                ", tel='" + tel + '\'' +
                ", flowerSum=" + flowerSum +
                ", time='" + time + '\'' +
                '}';
    }
}

数据库工具类：

作用：连接数据库，对数据库进行增删改查

package sql;

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

import static java.sql.DriverManager.getConnection;

/**
 * 数据库工具类
 * @author Administrator
 *
 */
public class Connectionlain {
    
    
    /*String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    String url = "jdbc:sqlserver://127.0.0.1;DatabaseName=test";*/

    //驱动
    //String driver = "com.mysql.jdbc.Driver";
    String driver = "com.mysql.cj.jdbc.Driver";
    // 数据库的位置，url是统一资源定位符，Java是我的目标数据库名，仅需修改这就可以了
    String url = "jdbc:mysql://127.0.0.1:3306/java?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=UTF-8";
    
    
    Connection con = null;
    ResultSet res = null;

    public void DataBase() {
    
    
            try {
    
    
                Class.forName(driver);
                con = getConnection(url, "root", "520");
            } catch (ClassNotFoundException e) {
    
    
                // TODO Auto-generated catch block
                  System.err.println("装载 JDBC/ODBC 驱动程序失败。" );
                e.printStackTrace();
            } catch (SQLException e) {
    
    
                // TODO Auto-generated catch block
                System.err.println("无法连接数据库" );
                e.printStackTrace();
            }
    }

    // 查询
    public ResultSet Search(String sql, String str[]) {
    
    
        DataBase();
        try {
    
    
            PreparedStatement pst =con.prepareStatement(sql);
            if (str != null) {
    
    
                for (int i = 0; i < str.length; i++) {
    
    
                    //把str[i]设为第i+1个数据
                    //sql语句没有第0个数据，1开始
                    pst.setString(i + 1, str[i]);
                }
            }
            //PreparedStatement接口提供了三种执行 SQL 语句的方法:
            //executeQuery、executeUpdate 和 execute
            res = pst.executeQuery();

        } catch (Exception e) {
    
    
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return res;
    }

    // 增删修改
    public int AddU(String sql, String str[]) {
    
    
        int a = 0;
        DataBase();
        try {
    
    
            PreparedStatement pst = con.prepareStatement(sql);
            if (str != null) {
    
    
                for (int i = 0; i < str.length; i++) {
    
    
                    pst.setString(i + 1, str[i]);
                }
            }
            a = pst.executeUpdate();
            
        } catch (Exception e) {
    
    
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return a;
    }

}

User类的服务类：

作用：从数据库中获取User数据，从Excel中获取User数据

import jxl.Sheet;
import jxl.Workbook;
import sample.User;

import java.io.File;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * User类的数据服务
 * @author Administrator
 *
 */
public class UserService {
    
    

   /**
    * 获取数据库中所有的数据
    * @return
    */
       public static List<User> getAllByDb(String sqlname){
    
    
           List<User> list=new ArrayList<User>();
           try {
    
    
               Connectionlain con = new Connectionlain();
               String sql="select * from "+sqlname;
               
               ResultSet rs= con.Search(sql, null);
               
               while (rs.next()) {
    
      
                   String userName=rs.getString("userName");
                   String password=rs.getString("password");
                   String sex =rs.getString("sex");
               String address = rs.getString("address");
                   String tel =rs.getString("tel");
                   int flowerSum = rs.getInt("flowerSum");
               String time = rs.getString("time");
                   
                   //System.out.println(id+" "+name+" "+sex+ " "+num);
                   //把当前数据插入集合，作为一条数据
                   list.add(new User(userName, password,sex,address,tel,flowerSum,time));
               }
               
           } catch (SQLException e) {
    
    
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
           return list;
       }

/**
 * 获取EXCEL表格中所有的数据
 * @param file 文件完整路径
 * @return
 */
public static List<User> getAllByExcel(String file){
    
    
   List<User> list=new ArrayList<User>();
   try {
    
    
      //打开工作簿
      Workbook rwb=Workbook.getWorkbook(new File(file));
      //选择目标工作表为：Sheet1
      Sheet rs=rwb.getSheet(0);
      
      int clos=rs.getColumns();//得到所有的列
      int rows=rs.getRows();//得到所有的行

      //System.out.println(clos+" rows:"+rows);
      for (int i = 2; i < rows; i++) {
    
    
         for (int j = 0; j < clos; j++) {
    
    

            //第一个是列数，第二个是行数
            String userName = rs.getCell(j++, i).getContents();//默认最左边编号也算一列 所以这里得j++
            String password = rs.getCell(j++, i).getContents();
            String sex =rs.getCell(j++, i).getContents();
            String address =rs.getCell(j++, i).getContents();
            String tel = rs.getCell(j++,i).getContents();
            String flowerSum = rs.getCell(j++,i).getContents();
            String time = rs.getCell(j++,i).getContents();

            list.add(new User(userName,password,sex,address,tel,Integer.valueOf(flowerSum),time));
         }
      }
   } catch (Exception e) {
    
    
      // TODO Auto-generated catch block
      e.printStackTrace();
   }
   return list;

}

导入到数据库测试类

作用：将获取到的User数据导入目标数据库

import sample.Sale;
import sample.User;

import java.util.List;

/**
 * 导入Excel数据
 */
public class TestExcelToDb{
    
    
  public static void main(String[] args){
    
    
       userExcel();
   }

  private static void userExcel() {
    
    
    //得到目标Excel中所有的数据
    List<User> listExcel = UserService.getAllByExcel("C:\\Users\\Administrator\\IdeaProjects\\untitled2\\src\\sample\\记录表.xls");

    //连接数据库
    Connectionlain con = new Connectionlain();

   //遍历集合，依次导入数据进数据库
    for (User u : listExcel) {
    
    
        //编写SQL语句，列属性要和数据对上，否则导入会出错
        String sql = "insert into flowerUser (userName,password,sex,address,tel,flowerSum,time) values(?,?,?,?,?,?,?)";
        //需要插入的数据           
        String[] str = new String[]{
    
    u.getUserName(),u.getPassword(),u.getSex(), u.getAddress(), u.getTel(),u.getFlowerSum()+"",u.getTime()};
        con.AddU(sql, str);
    }
}

导出到Excel测试类

作用：将获取到的User数据导出Excel表

package sql;

import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import sample.Flower;
import sample.Sale;
import sample.User;

import java.io.File;
import java.util.List;

/**
 * Excel导表类
 */
public class TestDbToExcel {
    
    

    public static void main(String[] args) {
    
    () {
    
    
        try {
    
    
            WritableWorkbook wwb = null;

            // 创建可写入的Excel工作簿
            String fileName = "C:\\Users\\Administrator\\IdeaProjects\\untitled2\\src\\sample\\记录表.xls";
            File file=new File(fileName);

            //判断文件是否存在
            if (!file.exists()) {
    
    
                file.createNewFile();
            }

            //以fileName为文件名来创建一个Workbook
            wwb = Workbook.createWorkbook(file);

            //导出数据库flowerUser表中所有的数据
            String sql=null;

            sql = "flowerUser";
            userExcel(sql,wwb);
        
            //写进文档
            wwb.write();
            // 关闭Excel工作簿对象
            wwb.close();

        } catch (Exception e) {
    
    
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    private static void userExcel(String sql,WritableWorkbook wwb) throws WriteException {
    
    

        // 创建工作表sheet1为用户表
        WritableSheet ws = wwb.createSheet("用户表", 0);
        //从数据库中获取flowerUser的所有的数据
        List<User> list= UserService.getAllByDb(sql);

        //要插入到的Excel表格的行号（表头），默认从0开始
        Label labelName= new Label(0, 0, "userName");
        Label labelPassword= new Label(1, 0, "password");
        Label labelSex= new Label(2, 0, "sex");
        Label labelTel= new Label(3, 0, "tel");
        Label labelAddress= new Label(4, 0, "address");
        Label labelSum= new Label(5, 0, "flowerSum");
        Label labelTime= new Label(6, 0, "time");

        ws.addCell(labelName);
        ws.addCell(labelPassword);
        ws.addCell(labelSex);
        ws.addCell(labelTel);
        ws.addCell(labelAddress);
        ws.addCell(labelSum);
        ws.addCell(labelTime);
        
        //逐行插入数据
        //A1-B1-C1-D1....为一行
        for (int i = 0; i < list.size(); i++) {
    
    

            Label labelName_i= new Label(0, i+1, list.get(i).getUserName());
            Label labelPassword_i= new Label(1, i+1, list.get(i).getPassword());
            Label labelSex_i= new Label(2, i+1, list.get(i).getSex());
            Label labelTel_i= new Label(3, i+1, list.get(i).getTel());
            Label labelAddress_i= new Label(4, i+1, list.get(i).getAddress());
            Label labelSum_i= new Label(5, i+1, list.get(i).getFlowerSum()+"");
            Label labelTime_i= new Label(6, i+1, list.get(i).getTime());

            ws.addCell(labelName_i);
            ws.addCell(labelPassword_i);
            ws.addCell(labelSex_i);
            ws.addCell(labelTel_i);
            ws.addCell(labelAddress_i);
            ws.addCell(labelSum_i);
            ws.addCell(labelTime_i);

        }
    }

}

代码执行效果：

Excel表：

数据库中的flowerUser表：