若依框架之简历pdf文档预览功能

一、前端

（1）安装插件vue-pdf：npm install vue-pdf

（2）引入方式：import pdf from "vue-pdf";

（3）components注入方式：components:{pdf}

（4）前端预览按钮设置

         <el-button
            size="mini"
            type="text"
            icon="el-icon-view"
            @click="handleShow(scope.row)"
            v-hasPermi="['resumes:resumes:show']"
          >预览</el-button>

 （5）预览弹窗

    <!-- 简历预览框 -->
    <el-dialog :title="title" :visible.sync="show" width="800px"  append-to-body>
      <pdf v-for="pdfPage in previewData.pdfPages" :key="pdfPage" :page="pdfPage" :src="previewData.src"
           width="100%">
      </pdf>
    </el-dialog>

 （6）预览的参数设置

      //简历预览弹窗
      show:false,
      //pdf属性
      previewData:{
        type:"",
        src:"",
        pdfPages:[]
      },

 （7）方法实现，调用showResume方法

将showResume方法返回数据的形式设置成blob流的形式

export function showResume(id){
  return request({
    url: '/resumes/resumes/show/' + id,
    method: 'get',
    responseType: 'blob'
  })

    handleShow(row){
      const id = row.id
      showResume(id).then(res => {
        this.show = true;
        this.title="简历预览"
        let blob = new Blob([res]);
        this.previewData.type="pdf";
        this.previewData.src=URL.createObjectURL(blob);
        let loadingTask=pdf.createLoadingTask(this.previewData.src);
        loadingTask.promise.then(pdf=>{
          this.previewData.pdfPages=pdf.numPages;
        })
      });
    },

二、后端

（1）show方法的实现，入参是前端传回来的简历的id值，根据id值获取简历的存储路径（简历存储在了本地）

    @PreAuthorize("@ss.hasPermi('resumes:resumes:show')")
    @GetMapping("/show/{id}")
    public ResponseEntity<InputStreamResource> show(@PathVariable Long id) throws IOException {
        Resumes resumes=new Resumes();
        resumes=resumesService.selectResumesById(id);
        String path=resumes.getFileUrl();
        FileSystemResource file = new FileSystemResource(path);

        // 设置响应头
        HttpHeaders headers = new HttpHeaders();
        headers.add("Content-Disposition", String.format("attachment; filename=\"%s\"", file.getFilename()));

        return ResponseEntity
                .ok()
                .headers(headers)
                .contentLength(file.contentLength())
                .contentType(MediaType.parseMediaType("application/octet-stream"))
                .body(new InputStreamResource(file.getInputStream()));
    }

三、实现效果