【JavaWeb】servlet实现excel表格数据批量导入到数据库

news2024/9/28 21:44:25

这是一个教大家使用excel表格，批量将数据导入到数据库的一个教程

通过Javaweb项目的servlet技术实现，教程详细简单，跟着做就不会报错！

1.下载依赖包：

tomcat-jdbc的jar包下载：文件上传批量导入数据库依赖包 - 万策云盘

commons-fileupload的jar包下载：文件上传批量导入数据库依赖包 - 万策云盘

commons-io的jar包下载：文件上传批量导入数据库依赖包 - 万策云盘

servlet-api的jar包下载：文件上传批量导入数据库依赖包 - 万策云盘

2.编写html前端页面：

<form action="<%=basePath%>ImportMsg" enctype="multipart/form-data" method="post">
				     批量导入： <input style="border:1px solid black;" type="file" name="excelfilename">&nbsp;
				     <input type="submit" value="数据入库"/>
				</form>

3.编写工具实现类 DatabaseOperation.java：

package cn.itbaizhan.tyut.exam.common;
//
//Source code recreated from a .class file by IntelliJ IDEA
//(powered by Fernflower decompiler)
//

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DatabaseOperation {
 static Connection conn = null;
 static Statement stmt = null;

 public DatabaseOperation() {
     try {
         Class.forName("com.mysql.jdbc.Driver");
         System.out.println("连接数据库...");
         conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/exam?useUnicode=true&characterEncoding=UTF-8&useSSL=true", "root", "mmmmmmm");
         System.out.println("实例化Statement对象...");
         stmt = conn.createStatement();
         System.out.println("完成数据库连接...");
     } catch (SQLException var2) {
         var2.printStackTrace();
     } catch (Exception var3) {
         var3.printStackTrace();
     }

 }

 public void finalize() throws SQLException {
     if (stmt != null) {
         stmt.close();
     }

     if (stmt != null) {
         conn.close();
     }

 }

 public ResultSet select_op(String sql) throws SQLException {
     if (sql == null) {
         return null;
     } else {
         ResultSet rs = stmt.executeQuery(sql);
         return rs;
     }
 }

 public ResultSet select_op(String sql, int page, int count) throws SQLException {
     if (sql != null && page >= 0 && count > 0) {
         sql = sql + " limit " + page * count + ',' + count;
         ResultSet rs = stmt.executeQuery(sql);
         return rs;
     } else {
         return null;
     }
 }

 public int update_op(String sql) {
     if (sql == null) {
         return -1;
     } else {
         int result = -1;

         try {
             result = stmt.executeUpdate(sql);
         } catch (Exception var4) {
             var4.printStackTrace();
         }

         return result;
     }
 }

 public int select_count(int num, String table) {
     if (num > 0 && table != null) {
         int result = -1;

         try {
             ResultSet rs = stmt.executeQuery("select * from " + table);
             rs.last();
             result = rs.getRow();
             if (result % num == 0) {
                 result /= num;
             } else {
                 result = result / num + 1;
             }
         } catch (Exception var5) {
             var5.printStackTrace();
         }

         return result;
     } else {
         return -1;
     }
 }
}

4.编写servlet类 ImportMsg.java：

package cn.itbaizhan.tyut.exam.sys.servlets;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import cn.itbaizhan.tyut.exam.common.DatabaseOperation;;

/**
 * Servlet implementation class ImportMsg
 */
@WebServlet("/ImportMsg")
public class ImportMsg extends HttpServlet {
    private static final long serialVersionUID = 1L;

    // JDBC 驱动名及数据库 URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost:3306/exam";

    // 数据库的用户名与密码，需要根据自己的设置
    static final String USER = "root";
    static final String PASS = "mmmmmmm";//此处为自己数据库的密码

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        FileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);

        java.sql.Connection conn = null;
        java.sql.Statement stmt = null;
        try {
            // 注册 JDBC 驱动器
            Class.forName("com.mysql.jdbc.Driver");
            // 打开一个连接
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
            // 执行 SQL 查询
            stmt = conn.createStatement();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }

        try {
            List items = upload.parseRequest(request);
            InputStream is = null;
            Iterator iter = items.iterator();
            while (iter.hasNext()) {
                FileItem item = (FileItem) iter.next();
                if (!item.isFormField()) {
                    is = item.getInputStream();
                }
            }
            Workbook workbook = Workbook.getWorkbook(is);
            Sheet sheet = workbook.getSheet(0);
            // 行数111
            int rows = sheet.getRows();
            // 列数
            int columns = sheet.getColumns();

            PreparedStatement ps = conn
                    .prepareStatement("insert into subject(scontent,sa,sb,sc,sd,skey,sstate) values(?,?,?,?,?,?,?)");

            for (int i = 0; i < rows; i++) {
                if (i == 0) {// 第一行是属性，不读取
                    continue;
                }
                Cell ce0 = ((jxl.Sheet) sheet).getCell(0, i);
                Cell ce1 = ((jxl.Sheet) sheet).getCell(1, i);
                Cell ce2 = ((jxl.Sheet) sheet).getCell(2, i);
                Cell ce3 = ((jxl.Sheet) sheet).getCell(3, i);
                Cell ce4 = ((jxl.Sheet) sheet).getCell(4, i);
                Cell ce5 = ((jxl.Sheet) sheet).getCell(5, i);
                Cell ce6 = ((jxl.Sheet) sheet).getCell(6, i);
                
                String c0 = ce0.getContents();
                String c1 = ce1.getContents();
                String c2 = ce2.getContents();
                String c3 = ce3.getContents();
                String c4 = ce4.getContents();
                String c5 = ce5.getContents();
                int c6 = Integer.parseInt(ce6.getContents());

                ps.setString(1, c0);
                ps.setString(2, c1);
                ps.setString(3, c2);
                ps.setString(4, c3);
                ps.setString(5, c4);
                ps.setString(6, c5);
                ps.setInt(7, c6);
                ps.execute();
            }
            ps.close();
            conn.close();
            response.setContentType("text/html;charset=utf-8");
	        //显示弹窗并且当关闭弹窗后跳到指定页面
	        response.getWriter().write("<script>alert('叮咚，批量导入成功！');");
	        response.getWriter().flush();
            //response.sendRedirect(" .html");// 重定向到成功插入学生数据的页面
        } catch (FileUploadException e) {
            e.printStackTrace();
        } catch (BiffException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}