<input type="file" name="excel" id="xinmu">

<input type="button" id="newmj" value="导入">

//通过ajax进行操作
$(function(){
   $("#newmj").click(function(){
    alert("haha");
    $.ajax({
     url:'${pageContext.request.contextPath}/UploadExcelServlet?type=xinmu&filename='+$("#xinmu").val(),
     type:'get',
     success:function(result){
      //alert("haha");
      alert(result);
       var json= eval('(' + result + ')');
　　　　　　　　　　　　　　}
    })
   })
  }); 

 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  //request.setCharacterEncoding("utf-8");
  System.out.println("jinru");
  String type=request.getParameter("type");
  String filename=request.getParameter("filename");
  //System.out.println(filename);
  File file = new File("D:\\"+filename);// 表格存储的位置
  JSONObject jsonObject = new JSONObject();
  //记录一下文件是否存在
  if (file.exists()) {
   jsonObject.put("exist", "文件存在");
   List<Map<String, String>>list=ReadExcel.readExcel(file);
   MuJUService mjService = new MuJUService();
   for (Map<String, String> map : list) {
    jsonObject = mjService.addNewMuJu(map);
   }
   
  } else {
   jsonObject.put("exist", "文件不存在");
   System.out.println("文件不存在");
  }
  
 
 }

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;

public class ReadExcel {
 
 public static List<Map<String,String>> readExcel(File file){
  List<Map<String, String>>list =new ArrayList<Map<String,String>>();
  try {
   // 判断文件是否存在
    // 创建工作簿
    Workbook workbook = Workbook.getWorkbook(file);
    // 获得第一个工作表sheet1
    Sheet sheet = workbook.getSheet(0);
    // 获得数据
    for (int i = 1; i < sheet.getRows(); i++) {// sheet.getRows():获得表格文件行数
     Map<String, String>map = new HashMap<String, String>();
     for (int j = 0; j < sheet.getColumns(); j++) {// sheet.getColumns():获得表格文件列数
      Cell cell = sheet.getCell(j, i);
     // System.out.print(cell.getContents() + " ");
      map.put(sheet.getCell(j,0).getContents(), cell.getContents());
      //(列，行)
     }
     //System.out.println("");// 换行
     list.add(map);
    }
    //调用方法进行数据库的操作
    //.......
    System.out.println(list);
    workbook.close();// 关闭
   } catch (Exception e) {
    e.printStackTrace();
   }
  return list;
 }
}