2020-06-30 pol实现execl导入导出

1.导入依赖

    <!-- 解析表格 -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.11</version>
        </dependency>

2.spring-mvc.xml配置

 <!-- 声明文件上传解析器 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 设置文件上传的最大大小（字节）的限制 -->
        <property name="maxUploadSize" value="104857600"/>
        <property name="maxInMemorySize" value="4096"/>
        <property name="defaultEncoding" value="UTF-8"/>
    </bean>

3.controller

　　导入（即上传）

  @RequestMapping("/uploadregion.do")
    public String  uplodRegion(MultipartFile myfile,HttpServletRequest request) throws IOException {
        //1.存储上传的文件
        //1.1通过myfile获得文件名称
        String oldname=myfile.getOriginalFilename();
        //1.2判断oldname中是否有路径部分，如果有进行截取
        if(oldname.indexOf("/")>-1){
            oldname = oldname.substring(oldname.lastIndexOf("/")+1);
        }
        String newname= UUID.randomUUID().toString()+"_"+oldname;
        //2.解析上传的文件，解析出数据
       String savepath= request.getServletContext().getRealPath("/")+"upload\\";
        File file=new File(savepath);
        if(!file.isDirectory()){
            file.mkdir();
        }
        //3.根据解析出来的数据进行存储
        File savefile=new File(savepath,newname);
        try {
            myfile.transferTo(savefile);
        } catch (IOException e) {
            e.printStackTrace();
        }
        String filePath=savepath+newname;
        HSSFWorkbook workbook=new HSSFWorkbook(new FileInputStream(filePath));
        HSSFSheet sheet=workbook.getSheetAt(0);//第一个工作簿
        int i=0;
        List<Region> regions=new ArrayList<>();
        Region region=null;
        for (Row cells : sheet) {
            if(i==0){
                i=1;
                continue;
            }
            region=new Region();
            String id=cells.getCell(0).getStringCellValue();
            String province=cells.getCell(1).getStringCellValue();
            String city=cells.getCell(2).getStringCellValue();
            String district=cells.getCell(3).getStringCellValue();
            String postcode=cells.getCell(4).getStringCellValue();
            province=province.substring(0,province.length()-1);
            city=city.substring(0,city.length()-1);
            district=district.substring(0,district.length()-1);
            String info=province+city+district;
            String[] headByString= PinYin4jUtils.getHeadByString(info);
            String shortcode=String.join("",headByString);
            //城市编码
            String citycode=PinYin4jUtils.hanziToPinyin(city,"");
            region.setId(id);
            region.setCity(city);
            region.setCitycode(citycode);
            region.setDistrict(district);
            region.setPostcode(postcode);
            region.setProvince(province);
            region.setShortcode(shortcode);
            regions.add(region);
        }
        regionService.addAll(regions);
        return null;
    }

　导出（即下载）

  @RequestMapping("/outregion.do")
    public void out(HttpServletRequest request, HttpServletResponse response) throws IOException {
        List<Region> list=regionService.findAll(null);
        HSSFWorkbook workbook=new HSSFWorkbook();
        HSSFSheet sheet=workbook.createSheet("分区数据");
        HSSFRow row=sheet.createRow(0);
        row.createCell(0).setCellValue("区域编号");
        row.createCell(1).setCellValue("省份");
        row.createCell(2).setCellValue("城市");
        row.createCell(3).setCellValue("区域");
        row.createCell(4).setCellValue("邮编");
        for (Region region:list){
            HSSFRow datarow=sheet.createRow(sheet.getLastRowNum()+1);
            datarow.createCell(0).setCellValue(region.getId());
            datarow.createCell(1).setCellValue(region.getProvince());
            datarow.createCell(2).setCellValue(region.getCity());
            datarow.createCell(3).setCellValue(region.getDistrict());
            datarow.createCell(4).setCellValue(region.getPostcode());
        }
        String filename="区域数据.xls";
        //请求类型
        String contentType=request.getSession().getServletContext().getMimeType(filename);
        //输出流
        ServletOutputStream out=response.getOutputStream();
        //响应类型
        response.setContentType(contentType);
        //获取用户代理
        String agent=request.getHeader("User-Agent");
        //使用工具类进行解析
        filename= FileUtils.encodeDownloadFilename(filename,agent);
        //设置头文件信息
        response.setHeader("content-disposition","attachment;filename="+filename);
        workbook.write(out);
    }