转 java实现读取excel

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本文是读者转载的作品，向作者智慧云端日记致敬。
作者：爱读才能立世
出处：（http://www.cnblogs.com/zyw-205520/p/3762954.html）
版权声明：本文的版权归作者与博客园共有。转载时须注明本文的详细链接，否则作者将保留追究其法律责任。

实现的功能：

这里写图片描述

连接数据库的工具类:

package com.javen.db;

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

public class DBhepler {
/*String driver = “com.microsoft.sqlserver.jdbc.SQLServerDriver”;
String url = “jdbc:sqlserver://127.0.0.1;DatabaseName=javenforexcel”;*/

String driver = "com.mysql.jdbc.Driver";String url = "jdbc:mysql://127.0.0.1:3306/javenforexcel";Connection con = null;ResultSet res = null;public void DataBase() {        try {            Class.forName(driver);            con = DriverManager.getConnection(url, "root", "root");        } 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++) {                pst.setString(i + 1, str[i]);            }        }        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;}

}

表的实体如下:

package com.javen.entity;

/**
* @author Javen
* @Email zyw205@gmail.com
*
*/
public class StuEntity {
private int id;
private String name;
private String sex;
private int num;

public StuEntity() {}public StuEntity(int id, String name, String sex, int num) {    this.id = id;    this.name = name;    this.sex = sex;    this.num = num;}@Overridepublic String toString() {    return "StuEntity [id=" + id + ", name=" + name + ", sex=" + sex            + ", num=" + num + "]";}public int getId() {    return id;}public void setId(int id) {    this.id = id;}public String getName() {    return name;}public void setName(String name) {    this.name = name;}public String getSex() {    return sex;}public void setSex(String sex) {    this.sex = sex;}public int getNum() {    return num;}public void setNum(int num) {    this.num = num;}

}

Java实现Excel导入数据核心类读取Excel表中所有的数据、操作数据（查询、更新）:

package com.javen.service;

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

import jxl.Sheet;
import jxl.Workbook;

import com.javen.db.DBhepler;
import com.javen.entity.StuEntity;

/**
* @author Javen
* @Email zyw205@gmail.com
*
*/
public class StuService {
/**
* 查询stu表中所有的数据
* @return
*/
public static List getAllByDb(){
List list=new ArrayList();
try {
DBhepler db=new DBhepler();
String sql=”select * from stu”;
ResultSet rs= db.Search(sql, null);
while (rs.next()) {
int id=rs.getInt(“id”);
String name=rs.getString(“name”);
String sex=rs.getString(“sex”);
int num=rs.getInt(“num”);

            //System.out.println(id+" "+name+" "+sex+ " "+num);            list.add(new StuEntity(id, name, sex, num));        }    } catch (SQLException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }    return list;}/** * 查询指定目录中电子表格中所有的数据 * @param file 文件完整路径 * @return */public static List<StuEntity> getAllByExcel(String file){    List<StuEntity> list=new ArrayList<StuEntity>();    try {        Workbook rwb=Workbook.getWorkbook(new File(file));        Sheet rs=rwb.getSheet("Test Shee 1");//或者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 = 1; i < rows; i++) {            for (int j = 0; j < clos; j++) {                //第一个是列数，第二个是行数                String id=rs.getCell(j++, i).getContents();//默认最左边编号也算一列 所以这里得j++                String name=rs.getCell(j++, i).getContents();                String sex=rs.getCell(j++, i).getContents();                String num=rs.getCell(j++, i).getContents();                System.out.println("id:"+id+" name:"+name+" sex:"+sex+" num:"+num);                list.add(new StuEntity(Integer.parseInt(id), name, sex, Integer.parseInt(num)));            }        }    } catch (Exception e) {        // TODO Auto-generated catch block        e.printStackTrace();    }     return list;}/** * 通过Id判断是否存在 * @param id * @return */public static boolean isExist(int id){    try {        DBhepler db=new DBhepler();        ResultSet rs=db.Search("select * from stu where id=?", new String[]{id+""});        if (rs.next()) {            return true;        }    } catch (SQLException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }    return false;}public static void main(String[] args) {    /*List<StuEntity> all=getAllByDb();    for (StuEntity stuEntity : all) {        System.out.println(stuEntity.toString());    }*/    System.out.println(isExist(1));}

}

数据的数据导入到Excel表:

package com.javen.excel;

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

import com.javen.entity.StuEntity;
import com.javen.service.StuService;

import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

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 = "D://book.xls";           File file=new File(fileName);           if (!file.exists()) {               file.createNewFile();           }           //以fileName为文件名来创建一个Workbook           wwb = Workbook.createWorkbook(file);           // 创建工作表           WritableSheet ws = wwb.createSheet("Test Shee 1", 0);           //查询数据库中所有的数据           List<StuEntity> list= StuService.getAllByDb();           //要插入到的Excel表格的行号，默认从0开始           Label labelId= new Label(0, 0, "编号(id)");//表示第           Label labelName= new Label(1, 0, "姓名(name)");           Label labelSex= new Label(2, 0, "性别(sex)");           Label labelNum= new Label(3, 0, "薪水(num)");           ws.addCell(labelId);           ws.addCell(labelName);           ws.addCell(labelSex);           ws.addCell(labelNum);           for (int i = 0; i < list.size(); i++) {               Label labelId_i= new Label(0, i+1, list.get(i).getId()+"");               Label labelName_i= new Label(1, i+1, list.get(i).getName());               Label labelSex_i= new Label(2, i+1, list.get(i).getSex());               Label labelNum_i= new Label(3, i+1, list.get(i).getNum()+"");               ws.addCell(labelId_i);               ws.addCell(labelName_i);               ws.addCell(labelSex_i);               ws.addCell(labelNum_i);           }          //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();    } }

}

Excel表中的数据导入到MySql数据库

package com.javen.excel;

import java.util.List;

import com.javen.db.DBhepler;
import com.javen.entity.StuEntity;
import com.javen.service.StuService;

/**
* @author Javen
* @Email zyw205@gmail.com
*
*/
public class TestExcelToDb {
public static void main(String[] args) {
//得到表格中所有的数据
List listExcel=StuService.getAllByExcel(“d://book.xls”);
/*//得到数据库表中所有的数据
List listDb=StuService.getAllByDb();*/

    DBhepler db=new DBhepler();    for (StuEntity stuEntity : listExcel) {        int id=stuEntity.getId();        if (!StuService.isExist(id)) {            //不存在就添加            String sql="insert into stu (name,sex,num) values(?,?,?)";            String[] str=new String[]{stuEntity.getName(),stuEntity.getSex(),stuEntity.getNum()+""};            db.AddU(sql, str);        }else {            //存在就更新            String sql="update stu set name=?,sex=?,num=? where id=?";            String[] str=new String[]{stuEntity.getName(),stuEntity.getSex(),stuEntity.getNum()+"",id+""};            db.AddU(sql, str);        }    }}

}

感谢作者，转发收藏，大家交流，谢谢

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