npm install --save vue-pdf

<!--PDF 预览-->
 <el-dialog :title="PDF 预览"
  :visible.sync="viewVisible" width="80%" center
   @close='closeDialog'>
     <div style="margin-bottom: 15px; text-align: right">
        <el-button type="primary" size="small" @click.stop="previousPage">
           上一页
         </el-button>
         <el-button type="primary" size="small" @click.stop="nextPage">
         下一页
        </el-button>
     <span>当前第{{pdfPage}}页 / 共{{pageCount}}页</span>
    </div>

    <div >
     <pdf
       :src="src"
       :page="pdfPage"
       @num-pages="pageCount = $event"
       @page-loaded="pdfPage = $event"
       style="display: inline-block; width: 100%"
    ></pdf>
  </div>
</el-dialog>

<script>
 import pdf from 'vue-pdf';
 export default {
    components: {
      pdf
    },
    data() {
    return {
    //PDF预览
        viewVisible: false,
        src: null,
        pdfPage : 1,
        pageCount: 0,
  }
 },
 methods:{
  //PDF预览
      previewPDF(row){
        this.src = pdf.createLoadingTask(documentConstants.previewPDFUrl+row.contractId);
        this.src.then(pdf => {
          this.viewVisible = true;
        });
      },

      //关闭窗口初始化PDF页码
      closeDialog(){
        this.pdfPage = 1;
      },

      //PDF改变页数
      previousPage(){
        var p = this.pdfPage
        p = p>1?p-1:this.pageCount
        this.pdfPage = p
      },
      nextPage(){
        var p = this.pdfPage
        p = p<this.pageCount?p+1:1
        this.pdfPage = p
      }
 }
  }
</script>

@RequestMapping(value = "/previewPDF/{contractId}")
  public ResponseEntity<byte[]> previewPDF(@PathVariable Long contractId) throws TException, IOException {
    ContractAttachmentTmpModelDTO model = contractScanManagementRpcService.queryContractAttachmentTmp(contractId);
    HttpHeaders headers = new HttpHeaders();
    headers.setContentDispositionFormData("attachment", model.getAttachmentName());
    headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    return new ResponseEntity<byte[]>(model.getAttachmentData(),
        headers, HttpStatus.OK);
  }