导入excel就是一个上传excel文件，然后获取excel文件数据，然后处理数据并插入到数据库的过程
一、上传excel
前端jsp页面，我的是index.jsp
在页面中我自己加入了一个下载上传文件的功能，其中超链接就是下载
<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><script type="text/javascript" src="jquery/1.7.2/jquery-1.7.2.min.js"></script><script type="text/javascript" src="jquery/jquery.form.js"></script><script type="text/javascript">function test1(){var form = new FormData(document.getElementById("uploadForm"));$.ajax({contentType:"multipart/form-data",url:"servlet/UploadHandleServlet",type:"post",async:false,data:form,dataType:"json",processData: false, // 告诉jQuery不要去处理发送的数据contentType: false, // 告诉jQuery不要去设置Content-Type请求头success:function(data){var result=eval(data);var filePath=result[0].filePath;//alert(filePath);var fileName = result[0].imageName;$("#download").attr("href","servlet/DownLoadServlet?filePath="+filePath);document.getElementById("download").innerHTML = fileName; //上传文件后得到路径，然后处理数据插入数据库表中importExcel(filePath); }}); }function importExcel(filePath){$.ajax({url:"${pageContext.request.contextPath}/user/insertUserByExcelPath",type:"post",data:{"filePath":filePath},success:function(data){}});}</script><body>导入excel表格<form id="uploadForm" action="" method="post" enctype="multipart/form-data"> <table> <tr> <td>上传文件：</td> <td><input type="file" name="fileName" id="fileName"/></td> </tr></table></form><button id="uploadFile" onclick="test1();">确定</button><!-- servlet/DownLoadServlet -->上传的文件<a id="download" href=""></a></body></html>
后端的上传的servlet，其中需要commons-fileupload-1.2.1.jar的支持，然后我的保存路径savePath是自己写的一个配置文件来的，这里可以写上自己的上传文件所保存的路径就行,返回的是一个json，包括文件路径还有文件名
package com.huang.servlet;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.Iterator;import java.util.List;import java.util.UUID;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 mons.fileupload.FileItem;import mons.fileupload.disk.DiskFileItem;import mons.fileupload.FileUploadBase;import mons.fileupload.FileUploadException;import mons.fileupload.ProgressListener;import mons.fileupload.disk.DiskFileItemFactory;import mons.fileupload.servlet.ServletFileUpload;import mons.fileupload.util.Streams;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.stereotype.Controller;import com.huang.entity.User;import com.huang.utils.Excel2Bean;import com.huang.utils.PropertiesUtil;/*** Servlet implementation class UploadHandleServlet*/@WebServlet("/UploadHandleServlet")public class UploadHandleServlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public UploadHandleServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println("进入servlet");DiskFileItemFactory fac = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(fac);upload.setHeaderEncoding("UTF-8");// 获取多个上传文件List fileList = null;try {fileList = upload.parseRequest(request);} catch (FileUploadException e) {// TODO Auto-generated catch blocke.printStackTrace();}// 遍历上传文件写入磁盘Iterator it = fileList.iterator();while (it.hasNext()) {Object obit = it.next();if (obit instanceof DiskFileItem) {DiskFileItem item = (DiskFileItem) obit;// 如果item是文件上传表单域// 获得文件名及路径String fileName = item.getName();if (fileName != null) {String fName = item.getName().substring(item.getName().lastIndexOf("\\") + 1);String formatName = fName.substring(fName.lastIndexOf(".") + 1);// 获取文件后缀名String savePath = PropertiesUtil.getInstance().getProperty("uploadFile");//String savePath = this.getServletContext().getRealPath("/WEB-INF/upload");File expsfile = new File(savePath);if (!expsfile.exists()) {// 创建文件夹expsfile.mkdirs();}String realPath = savePath+"/"+ UUID.randomUUID().toString()+"."+formatName;System.out.println("realPath:"+realPath);BufferedInputStream bis = new BufferedInputStream(item.getInputStream());// 获得文件输入流BufferedOutputStream outStream = new BufferedOutputStream(new FileOutputStream(new File(realPath)));// 获得文件输出流Streams.copy(bis, outStream, true);// 开始把文件写到你指定的上传文件夹// 上传成功，则插入数据库File file = new File(realPath);if (file.exists()) {//request.setAttribute("realPath", realPath);//request.getRequestDispatcher("/user/insertUserByExcelPath").forward(request, response);// 返回文件路径String imageName = file.getName();String json = "[{\"filePath\":\""+ realPath+ "\",\"imageName\":\"" + imageName + "\"}]";response.reset();response.setContentType("text/json");response.setCharacterEncoding("UTF-8");response.getWriter().write(json);//response.getWriter().write(realPath);response.getWriter().flush();}}}}}}
二、处理excel表格并得到含有Javabean的list
在用ajax调用servlet上传文件后得到路径和文件名，然后进行excel数据处理，在前端的页面上调用importExcel()的js函数，传入刚刚得到的文件路径
我这里用的是ssm框架中的controller（我自己也学习一下），这里也可以用servlet,或者Struts等。能访问到后端服务就行。
这里是controller中的代码，主要数据处理在Excel2Bean.getBeanByExcelPath(filePath, User.class)这个方法中
import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.annotation.Resource;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;import org.springframework.web.servlet.ModelAndView;import com.huang.entity.User;import com.huang.service.UserService;import com.huang.utils.Excel2Bean;@Controller("/userController")@RequestMapping("/user")public class UserController {@AutowiredExcel2Bean excel2Bean;@Resource(name="userService")UserService userService;@RequestMapping("/insertUserByExcelPath")public void insertUserByExcelPath(HttpServletRequest req,HttpServletResponse Resp){System.out.println("进入insertUserByExcelPath");String filePath = req.getParameter("filePath");System.out.println("filePath:"+filePath);List<User> list =Excel2Bean.getBeanByExcelPath(filePath, User.class);excel2Bean.testinsert(list);}}
这里就说说Excel2Bean.getBeanByExcelPath(filePath, User.class)这个方法
从excel表格中获取数据然后转换成一个javaBean的list集合，代码中操作excel表格需要用到的jar poi-ooxml-3.9-1203.jar，poi-3.9-1203.jar，poi-ooxml-schemas-3.9-1203.jar，为什么要用到这些jar，因为在有些之前的版本的poi中可能对word的版本不能兼容，网上具体有说到这个。最好是用org.apache.poi.ss.usermodel.Workbook这个来操作excel，poi各种版本官网下载可以参考微博CSDN。对于getBeanByExcelPath这个方法使用到了泛型，也使用到了一点点的反射的东西，获取一个类的属性，并给属性赋值。代码中有方法测试这个获取Javabean的属性并赋值的方法。这个方法也是为了能更通用一点，适用于更多的javabean，更多的表。当然excel的表头就要用到Javabean中的属性名称了。如果对泛型不是很了解的可以学习一下，当然也可以先看里面的readExcel(filePath)这个方法，是一个固定的Javabean对象
代码如下
package com.huang.utils;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.lang.reflect.Field;import java.text.DecimalFormat;import java.text.SimpleDateFormat;import java.util.*;import javax.annotation.PostConstruct;import javax.annotation.Resource;import net.sf.jxls.exception.ParsePropertyException;import net.sf.jxls.transformer.XLSTransformer;import org.apache.poi.hssf.model.Workbook;import org.apache.poi.hssf.usermodel.HSSFCell;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.openxml4j.exceptions.InvalidFormatException;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.ss.usermodel.WorkbookFactory;import org.ponent;import com.huang.entity.User;import com.huang.service.UserService;@Componentpublic class Excel2Bean {@Resource(name="userService")UserService userService;public static Excel2Bean excel2Bean;@PostConstructpublic void init() {excel2Bean = this;}public static void testinsert(List<User> list){if(list!=null&&list.size()>0){for (User user : list) {user.setId(excel2Bean.userService.getMaxId()+1);excel2Bean.userService.insertUserByUser(user);}}//System.out.println(excel2Bean.userService.getMaxId());}/** * 获取属性名数组 * @throws IllegalAccessException * @throws InstantiationException * @throws SecurityException * */ public static String[] getFiledName(Class<?> clazz) throws SecurityException, InstantiationException, IllegalAccessException{Field[] fields=clazz.newInstance().getClass().getDeclaredFields(); String[] fieldNames=new String[fields.length]; for(int i=0;i<fields.length;i++){ // System.out.println(fields[i].getType()); fieldNames[i]=fields[i].getName(); } return fieldNames; } public static <T>T getByExcelPath(String excelPath,Class<T> clazz){T bean = null;try {bean = clazz.newInstance();String tableName = clazz.getSimpleName();// 反射bean上与列名相同的属性try {Field f = bean.getClass().getDeclaredField("name");f.setAccessible(true);f.set(bean, "兽王");//System.out.println(f);} catch (NoSuchFieldException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (InstantiationException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();}return bean;}public static <T> List<T> getBeanByExcelPath(String excelPath,Class<T> clazz){List<T> list = new ArrayList<T>();org.apache.poi.ss.usermodel.Workbook workbook = null;InputStream is = null;try {is = new FileInputStream(excelPath);workbook = WorkbookFactory.create(is);is.close();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InvalidFormatException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} // 循环工作表for (int numSheet = 0; numSheet < workbook.getNumberOfSheets(); numSheet++) {Sheet sheet = workbook.getSheetAt(numSheet);//得到工作表if (sheet == null) {continue;}// 循环行 因为表头行是第0行，所以从0开始循环Row rowHead = sheet.getRow(0);for (int rowNum = 1; rowNum <= sheet.getLastRowNum(); rowNum++) {T bean = null;try {bean = clazz.newInstance();} catch (InstantiationException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IllegalAccessException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}Row row = sheet.getRow(rowNum);//得到行short s = row.getLastCellNum();//得到此行有多少列for (int i = 0; i < s; i++) {Cell cell = row.getCell(i);//得到单元格（每行）Cell cellHead = rowHead.getCell(i);String feild = (String) getCellValObject(cellHead);//得到表头属性名称Object value = getCellValObject(cell);Field f = null;try {f = bean.getClass().getDeclaredField(feild);//根据名称获取bean中的属性f.setAccessible(true);f.set(bean, value);//给属性赋值} catch (NoSuchFieldException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} }//把所有属性值添加完成后装入list中list.add(bean);}}return list;}public static String getCellVal(HSSFCell cel) {if(cel.getCellType() == HSSFCell.CELL_TYPE_STRING) {return cel.getRichStringCellValue().getString();}if(cel.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {return cel.getNumericCellValue() + "";}if(cel.getCellType() == HSSFCell.CELL_TYPE_BOOLEAN) {return cel.getBooleanCellValue() + "";}return cel.toString();}public static String getCellVal(Cell cel) {if(cel.getCellType() == Cell.CELL_TYPE_STRING) {return cel.getRichStringCellValue().getString();}if(cel.getCellType() == Cell.CELL_TYPE_NUMERIC) {return cel.getNumericCellValue() + "";}if(cel.getCellType() == Cell.CELL_TYPE_BOOLEAN) {return cel.getBooleanCellValue() + "";}if(cel.getCellType() == Cell.CELL_TYPE_FORMULA) {return cel.getCellFormula() + "";}return cel.toString();}public static Object getCellValObject(Cell cel) {if(cel.getCellType() == Cell.CELL_TYPE_STRING) {return cel.getRichStringCellValue().getString();}if(cel.getCellType() == Cell.CELL_TYPE_NUMERIC) {return new Integer(Double.valueOf(cel.getNumericCellValue()).intValue());}if(cel.getCellType() == Cell.CELL_TYPE_BOOLEAN) {return cel.getBooleanCellValue() + "";}if(cel.getCellType() == Cell.CELL_TYPE_FORMULA) {return cel.getCellFormula() + "";}return null;}public static List<User> readExcel(String filePath){List<User> list = new ArrayList<User>();// HSSFWorkbook workbook = null;org.apache.poi.ss.usermodel.Workbook workbook = null;try {// 读取Excel文件InputStream inputStream = new FileInputStream(filePath);//workbook = new HSSFWorkbook(inputStream);workbook = WorkbookFactory.create(inputStream);inputStream.close();} catch (Exception e) {e.printStackTrace();}// 循环工作表for (int numSheet = 0; numSheet < workbook.getNumberOfSheets(); numSheet++) {Sheet hssfSheet = workbook.getSheetAt(numSheet);if (hssfSheet == null) {continue;}// 循环行for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {Row hssfRow = hssfSheet.getRow(rowNum);// System.out.println("hssfRow1:"+hssfRow.getRowNum());// System.out.println("hssfRow2:"+hssfRow.getLastCellNum());if (hssfRow == null) {continue;}// 将单元格中的内容存入集合User user = new User();Cell cell = hssfRow.getCell(0);if (cell == null) {continue;}String name = getCellVal(cell);System.out.println("name:"+name);user.setName(name);cell = hssfRow.getCell(1);if (cell == null) {continue;}String age = getCellVal(cell);Integer aa = Double.valueOf(age).intValue();System.out.println("age:"+age);user.setAge(Double.valueOf(age).intValue());list.add(user);}}return list;}}
三、插入数据库
得到excel转换成Javabean的list对象后然后插入到数据库中。需要自己去实现UserService 的insertUserByUser方法。反正得到数据，然后往数据库插入数据这个操作也可以用其他方式的，框架也好，jdbc连接数据库直接去执行sql也好，都OK。
最后贴一下下载上传的文件的servlet代码
package com.huang.servlet;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import .URLEncoder;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/*** Servlet implementation class DownLoadServlet*/@WebServlet("/DownLoadServlet")public class DownLoadServlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public DownLoadServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request,response);}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// 下载文件//String path = "d:"+File.separator + "mytestfile" + File.separator + "testFile.txt";String path = request.getParameter("filePath");String realPath = path.substring(path.lastIndexOf("\\")+1); response.setHeader("content-disposition","attachment; filename="+URLEncoder.encode(realPath, "utf-8")); //获取到所下载的资源 FileInputStream fis = new FileInputStream(path);if(fis!=null){int len = 0;byte[] buf = new byte[1024];while ((len = fis.read(buf)) != -1) {response.getOutputStream().write(buf, 0, len);}fis.close();}else{response.getWriter().write("服务器上面不存在该文件");}}}
还有User.java这个javabean
public class User {private Integer id;private String name;private Integer age;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name == null ? null : name.trim();}
页面效果如下，超链接可以下载，点击确定后上传文件并取数据然后插入数据库表中
excel表格形式如下
文章不知道有什么遗漏的地方，有的话，还请多多指教。
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