<!-- excel解析包 -->
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<!--處理2003 excel-->
<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi</artifactId>
  <version>3.16</version>
</dependency>
<!--處理2007 excel-->
<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi-ooxml</artifactId>
  <version>3.16</version>
</dependency>

//配置文件上傳
@Bean(name = "multipartResolver")
public MultipartResolver multipartResolver() {
  CommonsMultipartResolver resolver = new CommonsMultipartResolver();
  resolver.setDefaultEncoding("UTF-8");
  // resolveLazily屬性啟用是為了推遲文件解析，以在在UploadAction中捕獲文件大小異常
  resolver.setResolveLazily(true);
  resolver.setMaxInMemorySize(40960);
  // 上傳文件大小 5G
  resolver.setMaxUploadSize(5 * 1024 * 1024 * 1024);
  return resolver;
}

package com.sanyu.tender.util.excelAnalysis;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;
import java.io.*;
import java.util.ArrayList;
/**
 * @Author：huang
 * @Date：2019-09-10 10:29
 * @Description：excel文件解析類
 */
public class Analysis {
  public Analysis() {
    throw new Error("工具類不允許實例化！");
  }
  /**
   * 獲取并解析excel文件，返回一個二維集合
   * @param file 上傳的文件
   * @return 二維集合（第一重集合為行，第二重集合為列，每一行包含該行的列集合，列集合包含該行的全部單元格的值）
   */
  public static ArrayList<ArrayList<String>> analysis(MultipartFile file) {
    ArrayList<ArrayList<String>> row = new ArrayList<>();
    //獲取文件名稱
    String fileName = file.getOriginalFilename();
    System.out.println(fileName);

    try {
      //獲取輸入流
      InputStream in = file.getInputStream();
      //判斷excel版本
      Workbook workbook = null;
      if (judegExcelEdition(fileName)) {
        workbook = new XSSFWorkbook(in);
      } else {
        workbook = new HSSFWorkbook(in);
      }

      //獲取第一張工作表
      Sheet sheet = workbook.getSheetAt(0);
      //從第二行開始獲取
      for (int i = 1; i < sheet.getPhysicalNumberOfRows(); i++) {
        //循環獲取工作表的每一行
        Row sheetRow = sheet.getRow(i);
        //循環獲取每一列
        ArrayList<String> cell = new ArrayList<>();
        for (int j = 0; j < sheetRow.getPhysicalNumberOfCells(); j++) {
          //將每一個單元格的值裝入列集合
          cell.add(sheetRow.getCell(j).getStringCellValue());
        }
        //將裝有每一列的集合裝入大集合
        row.add(cell);

        //關閉資源
        workbook.close();
      }
    } catch (FileNotFoundException e) {
      e.printStackTrace();
      System.out.println("===================未找到文件======================");
    } catch (IOException e) {
      e.printStackTrace();
      System.out.println("===================上傳失敗======================");
    }
    return row;
  }
  /**
   * 判斷上傳的excel文件版本（xls為2003，xlsx為2017）
   * @param fileName 文件路徑
   * @return excel2007及以上版本返回true，excel2007以下版本返回false
   */
  private static boolean judegExcelEdition(String fileName){
    if (fileName.matches("^.+\\.(?i)(xls)$")){
      return false;
    }else {
      return true;
    }
  }
}

<input type="file" multiple name="file_0" id="input-file" class="input-file">

/*判斷文件類型*/
function isExcel(){
  var fileInput = document.getElementById("input-file").value;
  //判斷文件是否為空
  if (fileInput == null || fileInput.trim() == ''){
    //layer.msg('請上傳文件！');
    return false;
  }else {
    //判斷文件是否為excel文件
    var reg =/^.*\.(?:xls|xlsx)$/;
    if (!reg.test(fileInput)){
      //layer.msg('請上傳Excel文件！');
      return false;
    }else {
      return true;
    }
  }
}
/*文件上傳*/
function uplaodFile() {
  //當文件符合標準的時候才上傳
  if (isExcel()){
    //將上傳組件添加進臨時表單
    var form = new FormData();
    form.append("file", document.getElementById("input-file").files[0]);
    //提交表單
    $.ajax({
      url: "http://localhost:8080/upload",
      data: form,
      cache: false,
      async: false,
      type: "POST",
      dataType: 'json',
      processData: false,
      contentType: false,
      success: function (data) {
        var status = data["status"]
        if(status == "success"){
          alert("解析成功！");
        }else {
          alert("解析失敗！");
        }
      },
      error: function (err) {
        console.log(err);
        alert("上傳失敗！");
      }
    });
  }
}

package com.sanyu.tender.controller.util;
import com.sanyu.tender.util.excelAnalysis.Analysis;
import javafx.scene.control.Alert;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @Author：huang
 * @Date：2019-09-09 18:41
 * @Description：<描述>
 */
@Controller
public class ImportFileController {
  //接受文件上傳
  @RequestMapping("/upload")
  @ResponseBody
  public Map uploadFile(MultipartFile file){
    Map<String,Object> map = new HashMap<>(16);
    //解析excel文件
    List<ArrayList<String>> row = Analysis.analysis(file);
    //打印信息
    for (int i = 0;i<row.size();i++){
      List<String> cell = row.get(i);
      for (int j = 0;j<cell.size();j++){
        System.out.print(cell.get(j)+" ");
      }
      System.out.println();
    }

    //如果要上傳到服務器的話
    /*String targetUrl = "D:\\MYURLFILE";
    try {
      file.transferTo(new File(targetUrl, fileName));
    } catch (IOException e) {
      e.printStackTrace();
      map.put("status","error");
    }*/

    map.put("status","success");
    return map;
  }
}