在做web开发时,我们经常会用到数据表格的导入导出功能,这样可以帮我们节省人工操作的时间,极大提高办事效率。
笔者所做的导入导出是针对Java springMVC框架、工作簿poi以及前端jquery-easyui插件设计的。
采用三层架构设计,前台发送请求到对应的servelet中,Servelet根据不同的请求实现具体的方法,到持久层查询数据库信息。(对于理解和学习java对excel操作很适合)
项目所需要的jar包和插件下载地址:
https://download.csdn.net/download/a1150499208/10921184
项目所需要的sql下载地址:
https://download.csdn.net/download/a1150499208/10921220
整体结构如下:
因为只是为了实现,导入导出的功能,和对数据库的查询和插入,页面直接使用的是插件包里面的,没做过多的修饰,效果如下:
点击左上角红色向左按钮导入,支持导入excel,通过解析excel里面的数据,封装起来,到持久层插入到对应的表中。
点击左上角黄色向右按钮导出,实现导出excel数据导出。
前台页面代码:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>POIExcel</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<script type="text/javascript" src="./jquery-easyui-1.4.1/jquery.min.js"></script>
<script type="text/javascript" src="./jquery-easyui-1.4.1/jquery.easyui.min.js"></script>
<script type="text/javascript" src="./jquery-easyui-1.4.1/locale/easyui-lang-zh_CN.js"></script>
<link rel="stylesheet" type="text/css" href="./jquery-easyui-1.4.1/themes/default/easyui.css">
<link rel="stylesheet" type="text/css" href="./jquery-easyui-1.4.1/themes/icon.css">
<script type="text/javascript">
$(function(){
Init();//打开页面就去查询了
});
//我去查询所有用户信息了
function Init(){
$('#excel').datagrid({
type : 'post',
url : './UserJsonServlet',
loadMsg : '数据加载中,请稍等!!!!!!!!',
nowrap : false,
striped : true,
fit : true,
pagination:true,
columns : [[
{field:'checkbox',checkbox:true},
{field : 'id',title : '编号',width : 100,align:'center'},
{field : 'name',title : '姓名',width : 120,align:'center'},
{field : 'sex',title : '性别',width : 100,align:'center'},
{field : 'age',title : '年龄',width : 120,align:'center'},
{field : 'tell',title : '电话',width : 150,align:'center'},
{field : 'address',title : '地址',width : 280,align:'center'}
]],
toolbar: [{
width:'50',
iconCls: 'icon-undo',
handler: function(){ExcelImport();}
},'-',{
width:'50',
iconCls: 'icon-redo',
handler: function(){ExcelExport();}
}]
});
}
/*Excel导入 */
function ExcelImport() {
alert("导入excel!")
var url="./ExcelImportServlet";
window.open(url);
}
/*Excel导出 */
function ExcelExport(){
alert("导出excel!")
var url="./ExcelExportServlet";
window.open(url);
}
</script>
</head>
<div align="center">
<div class="easyui-panel" title="Excel导入导出示例"
style="width: 930px; height: 350px; background: #fafafa;"
data-options="border:false">
<table id="excel"></table>
</div>
</div>
</body>
</html>
首次访问index页面,默认加载去查询数据库中表是否有数据:
package com.xiaoxiaozhen.servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.alibaba.fastjson.JSON;
import com.xiaoxiaozhen.model.UserBean;
import com.xiaoxiaozhen.service.UserJsonService;
//用户的业务层
public class UserJsonServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//请求发送都是utf-8
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
String parameter = request.getParameter("excel");
//查询用户信息
List<UserBean> list = new UserJsonService().finall();
//封装好的用户信息放到json中返回前台
String json = null;
json = JSON.toJSONString(list);
response.setCharacterEncoding("UTF-8");
response.getWriter().write(json);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
业务层向下跳:
package com.xiaoxiaozhen.service;
import java.util.List;
import com.xiaoxiaozhen.dao.UserJsonDao;
import com.xiaoxiaozhen.model.UserBean;
//用户业务层
public class UserJsonService {
UserJsonDao dao = new UserJsonDao();
//查询所有用户
public List<UserBean> finall() {
return dao.finall();
}
}
持久层来处理数据库相关的:
package com.xiaoxiaozhen.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.xiaoxiaozhen.model.UserBean;
import com.xiaoxiaozhen.util.DBTool;
//持久层
public class UserJsonDao {
//查询所有用户信息
public List<UserBean> finall() {
DBTool dbt = new DBTool();
PreparedStatement pstmt = null;
Connection conn = null;
ResultSet rs = null;
List<UserBean> list = new ArrayList<UserBean>();
try {
conn = dbt.getConnection();
String sql = "SELECT id,name,sex,age,tell,address FROM testexcel";
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
while (rs.next()) {
UserBean ub = new UserBean();
ub.setId(rs.getInt("id"));
ub.setName(rs.getString("name"));
ub.setSex(rs.getString("sex"));
ub.setAge(rs.getInt("age"));
ub.setTell(rs.getInt("tell"));
ub.setAddress(rs.getString("address"));
list.add(ub);
}
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}
}
首次进来因为数据库中没有资料,查询为空。
点击导入,读取分析excel中的数据信息,导入到数据中:
package com.xiaoxiaozhen.servlet;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
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;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import com.xiaoxiaozhen.model.UserBean;
import com.xiaoxiaozhen.service.ExcelImportService;
//导入excel
public class ExcelImportServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//请求发送都是utf-8
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
//文件路径 test.xlsx 文件在代码打包里面,给他这个excel放到C盘根目录下
List<UserBean> list = parseExcel("C:\\test.xlsx");
try {
//保存
new ExcelImportService().save(list);
} catch (Exception e) {
e.printStackTrace();
}
//保存完重新打开首页,首页默认会查询
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
// 解析Excel,读取内容,path Excel路径
public static List<UserBean> parseExcel(String path) {
List<UserBean> list = new ArrayList<UserBean>();
File file = null;
InputStream input = null;
if (path != null && path.length() > 7) {
// 判断文件是否是Excel(2003、2007)
String suffix = path
.substring(path.lastIndexOf("."), path.length());
file = new File(path);
try {
input = new FileInputStream(file);
} catch (FileNotFoundException e) {
System.out.println("未找到指定的文件!");
}
// Excel2003
if (".xls".equals(suffix)) {
POIFSFileSystem fileSystem = null;
// 工作簿
HSSFWorkbook workBook = null;
try {
fileSystem = new POIFSFileSystem(input);
workBook = new HSSFWorkbook(fileSystem);
} catch (IOException e) {
e.printStackTrace();
}
// 获取第一个工作簿
HSSFSheet sheet = workBook.getSheetAt(0);
list = getContent((Sheet) sheet);
// Excel2007
} else if (".xlsx".equals(suffix)) {
XSSFWorkbook workBook = null;
try {
workBook = new XSSFWorkbook(input);
} catch (IOException e) {
e.printStackTrace();
}
// 获取第一个工作簿
XSSFSheet sheet = workBook.getSheetAt(0);
list = getContent(sheet);
}
} else {
System.out.println("非法的文件路径!");
}
return list;
}
// 获取Excel内容
public static List<UserBean> getContent(Sheet sheet) {
List<UserBean> list = new ArrayList<UserBean>();
// Excel数据总行数
int rowCount = sheet.getPhysicalNumberOfRows();
// 遍历数据行,略过标题行,从第二行开始
for (int i = 1; i < rowCount; i++) {
UserBean ub = new UserBean();
Row row = sheet.getRow(i);
int cellCount = row.getPhysicalNumberOfCells();
// 遍历行单元格
for (int j = 0; j < cellCount; j++) {
Cell cell = row.getCell(j);
switch (j) {
case 0:
// 根据cell中的类型来输出数据
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
ub.setId((int)cell.getNumericCellValue());
}
break;
case 1:
if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
ub.setName(cell.getStringCellValue());
}
break;
case 2:
if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
ub.setSex(cell.getStringCellValue());
}
break;
case 3:
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
ub.setAge((int)cell.getNumericCellValue());
}
break;
case 4:
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
ub.setTell((int)cell.getNumericCellValue());
}
break;
case 5:
if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
ub.setAddress(cell.getStringCellValue());
}
break;
}
}
list.add(ub);
}
return list;
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
向下跳:
package com.xiaoxiaozhen.service;
import java.util.List;
import com.xiaoxiaozhen.dao.ExcelImportDao;
import com.xiaoxiaozhen.model.UserBean;
public class ExcelImportService {
//保存导入的信息
public void save(List<UserBean> list) {
new ExcelImportDao().save(list);
}
}
持久层来和数据库交互:
package com.xiaoxiaozhen.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
import com.xiaoxiaozhen.model.UserBean;
import com.xiaoxiaozhen.util.DBTool;
public class ExcelImportDao {
//保存导入的信息
public void save(List<UserBean> list) {
for (int i = 0; i < list.size(); i++) {
Connection conn = null;
PreparedStatement ps = null;
DBTool dbt = new DBTool();
try {
conn = dbt.getConnection();
String sql = "insert into testexcel(id, name,sex, age, tell, address) values('"
+ list.get(i).getId()
+ "', '"
+ list.get(i).getName()
+ "', '"
+ list.get(i).getSex()
+ "', '"
+ list.get(i).getAge()
+ "', '"
+ list.get(i).getTell()
+ "', '" + list.get(i).getAddress() + "')";
ps = conn.prepareStatement(sql);
ps.execute();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (ps != null) {
try {
ps.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
}
导入成功。