springboot+vue+element-ui下载excel模板（静态文件）

墨蓝 2021-11-06 00:56 449阅读 0赞

前端：

html:
          <div style="margin-top: 20px">
            <el-button  @click="downloadDemo" size="small">下载模板</el-button>
          </div>
    
    js:
    
    
          downloadDemo () {
            let url = Config.context + '/userManager/downloadExcel'
            this.common.exportData(url, this.queryForm, '数据模板_' + this.common.getTime())
          }

exportData (url, data, fileName) {
        axios({
          method: 'POST',
          url: url,
          data: data,
          responseType: 'blob'
        }).then(response => {
          if (!response) {
            return
          }
          const blob = new Blob([response.data])
          if (window.navigator && window.navigator.msSaveOrOpenBlob) {
            navigator.msSaveBlob(blob, fileName)
          } else {
            let u = window.URL.createObjectURL(response.data)
            let aLink = document.createElement('a')
            aLink.style.display = 'none'
            aLink.href = u
            aLink.setAttribute('download', fileName + '.xlsx')
            document.body.appendChild(aLink)
            aLink.click()
            document.body.removeChild(aLink)
            window.URL.revokeObjectURL(u)
          }
        }).catch(error => {
          throw error
        })
      }

后端：

controller层：

@RequestMapping("/downloadExcel")
        public ResponseEntity<byte[]> download2() throws IOException {
            File file = excelModelService.buildXlsById();
            return FileUtils.buildResponseEntity(file);
        }

service层：

import org.springframework.stereotype.Service;
    import org.springframework.util.ResourceUtils;
    
    import java.io.File;
    import java.io.FileNotFoundException;
    
    @Service
    public class ExcelModelService {
        public File buildXlsById(){
            //do something to find this file
            File file=null;
            try {
                file = ResourceUtils.getFile("classpath:templates/model.xlsx");
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            return file;
        }
    }

这里写的是静态文件的存放路径，注意不能中文名不然识别不了

![20190809153751874.png][]

文件下载工具类：

public static ResponseEntity<byte[]> buildResponseEntity(File file) throws IOException {
            byte[] body = null;
            //获取文件
            InputStream is = new FileInputStream(file);
            body = new byte[is.available()];
            is.read(body);
            HttpHeaders headers = new HttpHeaders();
            //设置文件类型
            headers.add("Content-Disposition", "attchement;filename=" + file.getName());
            //设置Http状态码
            HttpStatus statusCode = HttpStatus.OK;
            //返回数据
            ResponseEntity<byte[]> entity = new ResponseEntity<byte[]>(body, headers, statusCode);
            return entity;
        }

![20190809154057689.png][]

后续补充：

以上方式实现在开发环境没有任何问题，但是在生产环境会出现无法下载后台报错的情况，原因在于用流的方式读取文件，打成jar包之后，下载的文件会被损坏 ，后来网上说配置pom里面文件路径等等试了没用，直接用了POI的导出

修改后controller：

@RequestMapping(value="/downloadExcel")
        public ResponseEntity<Resource> excel2007Export(HttpServletResponse response, HttpServletRequest request) {
            try {
                ClassPathResource cpr = new ClassPathResource("/templates/"+"model.xlsx");
                InputStream is = cpr.getInputStream();
                Workbook workbook = new XSSFWorkbook(is);
                String fileName = "model.xlsx";
                downLoadExcel(fileName, response, workbook);
    
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return new ResponseEntity<Resource>(HttpStatus.OK);
        }

文件工具类downLoadExcel：

public static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
            try {
                response.setCharacterEncoding("UTF-8");
                response.setHeader("content-Type", "application/vnd.ms-excel");
                response.setHeader("Content-Disposition",
                        "attachment;filename=\"" + URLEncoder.encode(fileName, "UTF-8") + "\"");
                workbook.write(response.getOutputStream());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

[20190809153751874.png]: /images/20211104/4bb5f8d190de4c1e9d9a9570d2a280d9.png
[20190809154057689.png]: /images/20211104/a32052f404ed4b8fac02af6eed5d04a8.png