第一种方式:
文件预览展示
转换为 Blob对象
// 预览图片 或者pdf格式文件
getViewImg(id: string) {
return this.http.get(`/workflow/attachment/viewImg/${id}`, {
observe: 'response',
responseType: 'blob'
});
}
// 预览word文件或Excel文件
getViewFile(id: string) {
return this.http.get(`/workflow/attachment/view/${id}`, {
observe: 'response',
responseType: 'blob'
})
}
预览实现ts代码
// 附件预览
handlePreviewClick(item: any) {
if (!this.isPreviewModalVisible) {
this.changeIsSpinning.emit(true);
this.isPreviewModalVisible = true;
this.id = item.id;
this.isImage = this.handleiIsImage(item.attachmentName);
this.isPDF = this.handleiIsPDF(item.attachmentName);
let type = (this.isImage || this.isPDF) ? 'getViewImg' : 'getViewFile';
this.service[type](this.id).subscribe(
async (res: any) => {
if (this.isImage) {
const downloadUrl = window.URL.createObjectURL(res.body);
this.fileHTML = downloadUrl;
} else if (this.isPDF) {
let newBlob = new window.Blob([res.body], { type: 'application/pdf;charset-UTRF-8' })
const downloadUrl = window.URL.createObjectURL(newBlob);
this.fileHTML = downloadUrl;
} else {
this.fileHTML = await res.body.text();
}
this.changeIsSpinning.emit(false);
}, () => {
this.messageService.error('加载失败');
this.isPreviewModalVisible = false;
this.changeIsSpinning.emit(false);
}
)
}
}
弹窗代码
<nz-modal *ngIf="fileHTML" [nzStyle]="{ top: '50px' }" [nzWidth]="1100" [nzBodyStyle]="bodyStyle" [nzContent]="modalContent" [(nzVisible)]="isVisible" nzTitle="预览"
[nzFooter]="modalFooter" (nzOnCancel)="handleCancel()">
<ng-template #modalContent>
<div *ngIf="!isImage&&!isPDF" [innerHtml]="fileHTML"></div>
<img *ngIf="isImage" [src]="fileHTML" alt="加载失败" style="max-width:1044px"/>
<iframe *ngIf="isPDF" [src]="fileHTML" alt="加载失败" style="width:1044px;height: 510px;"></iframe>
</ng-template>
<ng-template #modalFooter>
<button nz-button nzType="primary" (click)="handleOk()">确定</button>
</ng-template>
</nz-modal>
第二种方式:
简单粗暴
展示:文章来源:https://www.toymoban.com/news/detail-757888.html
//1、请求接口 请求设置responseType
axios.get(url,{resonseType:'blob'})
//2.根据返回的值创建一个Blob对象, 以pdf文件为例
let blob = new Blob([result],{
type: "application/pdf;chartset=UTF-8"
})
//3.window.URL.createObjectURL创建一个url连接
let blob = new Blob([result],{
type: "application/pdf;chartset=UTF-8"
})
let url = window.URL.createObjectURL(blob)
//4.在线预览
//可以用iframe预览,url的值为 window.URL.createObjectURL(blob),或者直接打开window.open(url)
打印:文章来源地址https://www.toymoban.com/news/detail-757888.html
//1.创建iframe标签
const iframe = document.createElement('iframe')
//2.属性相关
iframe.className = 'tmp-pdf';
iframe.style.display = 'none'
// blobUrl 像在线预览1,2,3这样得来的url
iframe.src = blobUrl
//3.创建好的iframe添加到页面body
document.body.appendChild(iframe)
//4.执行打印方法,并移除iframe
setTimeout(function() {
iframe.contentWindow.print()
document.body.removechild(iframe)
}, 100)
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