iview Upload组件多文件上传，以及vue文件下载

iview Upload组件多文件上传

系统经常遇到文件上传的问题，iview提供了Upload组建，能够很好的实现文件上传，当然一次上传多个文件也是允许的。

思路：创建一个数组 把需要上传的文件 push到这个数组里面

1.引用组件

2.手动上传，根据官方文档 设置:before-upload ="handleUpload"等于false

(1).:before-upload 是 iview Upload 上传组件的一个属性 设置返回值为 false 可以阻止默认上传方式（自动上传模式）

(2).handleUpload 是上传处理方法，可以用于准备需要上传的文件。

技术范围：vue ，springboot

3.上传方法　　　

         //创建 formData 对象
          let formData = new FormData();
          //向 formData 对象中添加文件--这是其他参数
          formData.append('jsid', _jsid);
          //多个文件上传----------重点----需要把已经存储到本地的文件加入 formData所以这里用for循环
          for(var i=0; i< that.file.length; i++){
           formData.append("uploadFile",that.file[i]);  // 文件对象  
          }

需要的变量

add: {
    dialog: false,
    uploadFile: []
},
loadingStatus: false

HTML代码如下:

<Modal v-model="add.dialog" title="文件上传" :loading="true" :closable="false" width="540">
<Tabs>
    <TabPane label="选择文件">
    <Upload :before-upload="handleUpload" action multiple :format="['docx','doc','txt', 'pdf']">
        <Button icon="ios-cloud-upload-outline">Select the file to upload</Button>
    </Upload>
    <div>
        <ul class="file-list" v-for="(list,index) in add.uploadFile" :key="index">
         <li>
            <span style="font-size:15px;color:#FFFFFF">文件名: {{ list.name }}</span>
            <Icon type="ios-close" size="25" color="red" @click="delFileList(index)"></Icon>
         </li>
        </ul>
    </div>
    </TabPane>
</Tabs>
<div slot="footer">
<Button type="text" size="large" @click="cancleUpload">取消</Button>
<Button
type="primary"
@click="upload"
:loading="loadingStatus"
>{{ loadingStatus ? '上传中...' : '上传' }}</Button>
</div>
</Modal>

需要的数据处理方法

delFileList(index) {
  this.add.uploadFile.splice(index, 1);
},
handleUpload(file) {
 this.add.uploadFile.push(file);
 return false;
},
upload() {
    this.loadingStatus = true;
    console.log("上传："+this.add.uploadFile);
    var formData = new FormData();
    if (this.add.uploadFile.length > 0) {
        //多个文件上传
        for (var i = 0; i < this.add.uploadFile.length; i++) {
            formData.append("uploadFile", this.add.uploadFile[i]); // 文件对象
        }
        this.$http                                     
        .postFile(this.ports.package.upload, formData)  //使用自己封装的axios方法
        .then(rdata => {
            console.log(rdata);
            if (rdata.data.succ) {
                this.loadingStatus = false;
                this.add.uploadFile = [];
                this.$Message.success("Success");
                this.add.dialog = false;
            }
        })
        .catch(error => {
        this.loadingStatus = false;
        this.$Message.error("服务器错误" + error);
     });
    } else {
    this.loadingStatus = false;
    this.$Message.error("请至少上传一个文件");
    }
},

后期接收文件，我后台用的是springboot

@RequestMapping(value = "/upload", method = RequestMethod.POST)
public PackageResponse uploadPackage(HttpServletRequest request,
HttpServletResponse response,
@RequestParam("uploadFile") MultipartFile[] uploadFile) {    
    try {
        for (MultipartFile multipartFile : uploadFile) {

        }
    
    } catch (Exception e) {
        response.setStatus(400);
        return SimpleResponse.FAIL;
    }
    return SimpleResponse.SUCC;
}

这样整个文件上传基本就完成了！

vue文件下载

能上传就要能下载，文件的下载就很简单了，我使用的使用response返回文件流的方式 

methods: {
    toDownload() {
        axios({
                method: 'post',
                url: url,
                timeout: MAX_TIME_OUT_MS,
                responseType: 'blob'
            }).then(res => {
                console.log(res);
                this.download(res.data);
            })
            .catch(err => {
                console.log(err);
                if (err.response.status == 400) {
                    this.$Message.error("下载出错，文件可能不存在！！");
                }
            });
    },
    // 下载文件
    download(data) {
        if (!data) {
            return;
        }
        let url = window.URL.createObjectURL(new Blob([data]));
        let link = document.createElement("a");
        link.style.display = "none";
        link.href = url;
        link.setAttribute("download", "aaa.zip");


        document.body.appendChild(link);
        link.click();
        this.$Message.info("下载完成！");
        this.cancle();
    },
    cancle() {
        this.$router.push({
            path: "/edit"
        });
    }
}

springboot servie处理

public AppResponse download(HttpServletRequest request, HttpServletResponse response, String id) throws FileNotFoundException,IOException {
    String filePathName = base + downloadPath + id ;
    //3 下载
    String zipFileName = filePathName + ".zip";
    String filename = filePathName + ".zip";
    //设置文件类型
    response.setContentType("application/octet-stream");


    response.setCharacterEncoding("UTF-8");
    //设置Content-Disposition
    response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "utf-8"));
    InputStream in = new FileInputStream(zipFileName);
    OutputStream out = response.getOutputStream();
    //写文件
    int b;
    while ((b = in.read()) != -1) {
        out.write(b);
    }
    out.flush();
    in.close();//先关闭输入流才能删除
    out.close();
    return SimpleResponse.SUCC;
}