springboot实现上传并解析Excel

一、添加pom依赖#

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

二、在springboot中配置MultipartResolver#

//配置文件上传
@Bean(name = "multipartResolver")
public MultipartResolver multipartResolver() {
    CommonsMultipartResolver resolver = new CommonsMultipartResolver();
    resolver.setDefaultEncoding("UTF-8");
    // resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常
    resolver.setResolveLazily(true);
    resolver.setMaxInMemorySize(40960);
    // 上传文件大小 5G
    resolver.setMaxUploadSize(5 * 1024 * 1024 * 1024);
    return resolver;
}

三、Excel解析工具类#

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文件解析类
 */
public class Analysis {

    public Analysis() {
        throw new Error("工具类不允许实例化！");
    }

    /**
     * 获取并解析excel文件，返回一个二维集合
     * @param file 上传的文件
     * @return 二维集合（第一重集合为行，第二重集合为列，每一行包含该行的列集合，列集合包含该行的全部单元格的值）
     */
    public static ArrayList<ArrayList<String>> analysis(MultipartFile file) {
        ArrayList<ArrayList<String>> row = new ArrayList<>();
        //获取文件名称
        String fileName = file.getOriginalFilename();
        System.out.println(fileName);

        try {
            //获取输入流
            InputStream in = file.getInputStream();
            //判断excel版本
            Workbook workbook = null;
            if (judegExcelEdition(fileName)) {
                workbook = new XSSFWorkbook(in);
            } else {
                workbook = new HSSFWorkbook(in);
            }

            //获取第一张工作表
            Sheet sheet = workbook.getSheetAt(0);
            //从第二行开始获取
            for (int i = 1; i < sheet.getPhysicalNumberOfRows(); i++) {
                //循环获取工作表的每一行
                Row sheetRow = sheet.getRow(i);
                //循环获取每一列
                ArrayList<String> cell = new ArrayList<>();
                for (int j = 0; j < sheetRow.getPhysicalNumberOfCells(); j++) {
                    //将每一个单元格的值装入列集合
                    cell.add(sheetRow.getCell(j).getStringCellValue());
                }
                //将装有每一列的集合装入大集合
                row.add(cell);

                //关闭资源
                workbook.close();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            System.out.println("===================未找到文件======================");
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("===================上传失败======================");
        }

        return row;
    }

    /**
     * 判断上传的excel文件版本（xls为2003，xlsx为2017）
     * @param fileName 文件路径
     * @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;
        }

    }

}

四、controller#

该接口只负责接收前台上传的文件，和遍历打印Analysis工具类解析出的数据，可以略过不看

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 {


    //接受文件上传
    @RequestMapping("/upload")
    @ResponseBody
    public Map uploadFile(MultipartFile file){
        Map<String,Object> map = new HashMap<>(16);
        //调用工具类解析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();
        }

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

        return map;
    }
}