Vue+.net core 文件下载（Excel模板下载）

Vue代码

<el-dialog :visible.sync="showImportRank" width="21%" :append-to-body="true" :title="$t('roster.importRankTitle')">
            <el-upload class="upload-demo" drag :action="uploadHost + '/user/importUserRank'" :limit="1"
                :on-error="handleError" :on-success="handleSuccess" :headers="headObject" :auto-upload="false" ref="upload"
                accept=".xls,.xlsx">
                <i class="el-icon-upload"></i>
                <div class="el-upload__text">{{ $t('roster.putfilehere') }}<em>{{ $t('roster.selectfile') }}</em></div>
                <!--                <div class="el-upload__tip" slot="tip">只能上传excel文件</div>-->
            </el-upload>
            <span slot="footer" class="dialog-footer">
                <el-button size="small" icon="el-icon-upload2" type="success" @click="submitUpload">
                    {{ $t('roster.importServer') }}
                </el-button>
                <el-button size="small" icon="el-icon-download" type="success" @click="downLoadUserRankTemp">
                    {{ $t('roster.downloadTemplate') }}
                </el-button>
            </span>
        </el-dialog>

这段是下载按钮

<el-button size="small" icon="el-icon-download" type="success" @click="downLoadUserRankTemp">
{{ $t('roster.downloadTemplate') }}
</el-button>

Vue脚本：downLoadUserRankTemp

Method:{
        downLoadUserRankTemp() {
            this.$store.dispatch('downLoadTemp', { selType: 'RankLvl' });
        },
}

//this.$store.dispatch('downLoadTemp', { selType: 'RankLvl' });
//在Api.js中实现
//import httpV2 from '@/utils/httpV2';
//import Config from '@/utils/config';
//import Cache from '@/utils/cache';
//downLoadTemp({ state, commit }, params) {
//        return httpV2.getFile(process.env.VUE_APP_SDP_ADMIN_SECOND + //`/user/DownloadImportTemp`, params, this);
//    },


process.env.VUE_APP_SDP_ADMIN_SECOND + `/user/DownloadImportTemp`//请求接口地址
params//参数

httpV2.getFile方法：

/**
 * http.js
 * 封装axios，    通过store 定义全局loading状态
 * 调用方法:
 * http.get('/api/enquiry/web/query',{id:1}).then((res)=>{你的操作})
 * http.post('/api/enquiry/web/update',{id:1}).then((res)=>{你的操作})
 * http.postFormData('/api/enquiry/web/update',{id:1,file:file}).then((res)=>{你的操作})
 */
import axios from 'axios';
// import { state }  from '@/store/index.js'
import cache from '@/utils/cache';
import { Message } from 'element-ui';

axios.defaults.baseURL = process.env.VUE_APP_URL;
import Config from '@/utils/config';
// axios.defaults.headers.common.Authorization = cache.getStr("token")

export default {
    downLoad(res) {
        const fileName = res.headers["content-disposition"].split(";")[2].split("=")[1].replace("UTF-8''", "");
        const blob = new Blob([res.data], {
            type: "application/vnd.ms-excel;charset=utf-8"
        });
        const url = window.URL.createObjectURL(blob);
        const aLink = document.createElement("a");
        aLink.style.display = "none";
        aLink.href = url;
        aLink.setAttribute("download", decodeURI(fileName));
        document.body.appendChild(aLink);
        aLink.click();
        document.body.removeChild(aLink); //下载完成移除元素
        window.URL.revokeObjectURL(url); //释放掉blob对象
    }, 
    /**
     * @param {String} url [请求的url地址]
     * @param  {Object} params [请求时携带的参数]
     * @param context
     * @param token
     */
    getFile(url, params, context, token) {
        params.language = localStorage.language;
        let myTenantid = cache.get(Config.currentTenant) == null ? 1 : cache.get(Config.currentTenant).tenant_id;
        let myOrgId = cache.get(Config.currentTenant) == null ? 0 : cache.get(Config.currentTenant).org_id;
        context.dispatch('setLoading', true);
        return new Promise((resolve, reject) => {
            axios.get(url,
                {
                    responseType: 'blob', //返回是个文件
                    params: params,
                    headers: {
                        Authorization: cache.getStr(Config.accessToken),
                        TenantId: myTenantid,
                        SdpTenantId: myTenantid,
                        OrgId: myOrgId
                    }
                    //headers:{Authorization: "Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6IkFGRDNDNkMzOUVBQTA3QTZBRTY2Njg2MDFDMTMxM0NERDlFN0I3MzAiLCJ0eXAiOiJKV1QiLCJ4NXQiOiJyOVBHdzU2cUI2YXVabWhnSEJNVHpkbm50ekEifQ.eyJuYmYiOjE2Mjc5NTQ2NjAsImV4cCI6MTYyNzk5MDY2MCwiaXNzIjoiaHR0cHM6Ly90ZXN0LmFjY291bnQuYWlnb3N0YXIuY29tOjM0NDMiLCJhdWQiOlsiaHR0cHM6Ly90ZXN0LmFjY291bnQuYWlnb3N0YXIuY29tOjM0NDMvcmVzb3VyY2VzIiwiYXBpLWFkbWluIl0sImNsaWVudF9pZCI6ImFpZ28uY29tbXVuaXR5RGV0YWlsLnRlc3QiLCJzdWIiOiIxMjUwMjc2MDU3Mzc5MTE1MDA4IiwiYXV0aF90aW1lIjoxNjI3NjI2OTU2LCJpZHAiOiJsb2NhbCIsIm5hbWUiOiJib2IiLCJjb3VudHJ5X2NvZGUiOiJDTiIsInNjb3BlIjpbIm9wZW5pZCIsInByb2ZpbGUiLCJhcGktYWRtaW4iXSwiYW1yIjpbInB3ZCJdfQ.ALO2aa2S3E42zn3PW4r1WLyxw9w5pvB47xokr51ge4nPrJw82SzsiT1cIyJ8aUZgInboAsLM_RoFLlh96Rd0q_oGGQmsG7sjPDsdgOrs1jJrjKGFnnz2bDCDR_hooY3hOh4O4ykv2J8khDJP8bfcuWqoM6nTj8Lwu8H9GCnhhaYezmpiHOxXJfkw-w0yfqRirDCDkRbPar3VQqzXllN1smtzhxyVpGrcZKsUevyRt5yD8bBOevlm4h5JybWLWUtSXsQvQnQvLlYvcbwbILKBHwi1A2yEP8B61WWEY0DMu4DTzJXigZYiP8fSi9tTUW6pUtJcu6a3sPOp5BFrXTMD9w"}
                }
            ).then(res => {
                this.downLoad(res);
                context.dispatch('setLoading', false);
                resolve(res.data);
            }).catch(err => {
                // console.log(err);
                // context.dispatch('setLoading', false);
                // Message({
                //     type: 'error',
                //     message: err.response.data.message
                // });
                // if (err.response.status == 401) {
                //     setTimeout(() => {
                // localStorage.clear()
                //         window.location = '/login';
                //     }, 1000);
                // }
                // reject(err);
            });
        });
    },

    // 获取租户id列表，无需TenantId、myTenantid、myOrgId
    getTenantId(url, params, context, token) {
        params.language = localStorage.language;
        context.dispatch('setLoading', true);
        return new Promise((resolve, reject) => {

            axios.get(url,
                {
                    params: params,
                    headers: {
                        Authorization: cache.getStr(Config.accessToken),
                    }
                    //headers:{Authorization: "Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6IkFGRDNDNkMzOUVBQTA3QTZBRTY2Njg2MDFDMTMxM0NERDlFN0I3MzAiLCJ0eXAiOiJKV1QiLCJ4NXQiOiJyOVBHdzU2cUI2YXVabWhnSEJNVHpkbm50ekEifQ.eyJuYmYiOjE2Mjc5NTQ2NjAsImV4cCI6MTYyNzk5MDY2MCwiaXNzIjoiaHR0cHM6Ly90ZXN0LmFjY291bnQuYWlnb3N0YXIuY29tOjM0NDMiLCJhdWQiOlsiaHR0cHM6Ly90ZXN0LmFjY291bnQuYWlnb3N0YXIuY29tOjM0NDMvcmVzb3VyY2VzIiwiYXBpLWFkbWluIl0sImNsaWVudF9pZCI6ImFpZ28uY29tbXVuaXR5RGV0YWlsLnRlc3QiLCJzdWIiOiIxMjUwMjc2MDU3Mzc5MTE1MDA4IiwiYXV0aF90aW1lIjoxNjI3NjI2OTU2LCJpZHAiOiJsb2NhbCIsIm5hbWUiOiJib2IiLCJjb3VudHJ5X2NvZGUiOiJDTiIsInNjb3BlIjpbIm9wZW5pZCIsInByb2ZpbGUiLCJhcGktYWRtaW4iXSwiYW1yIjpbInB3ZCJdfQ.ALO2aa2S3E42zn3PW4r1WLyxw9w5pvB47xokr51ge4nPrJw82SzsiT1cIyJ8aUZgInboAsLM_RoFLlh96Rd0q_oGGQmsG7sjPDsdgOrs1jJrjKGFnnz2bDCDR_hooY3hOh4O4ykv2J8khDJP8bfcuWqoM6nTj8Lwu8H9GCnhhaYezmpiHOxXJfkw-w0yfqRirDCDkRbPar3VQqzXllN1smtzhxyVpGrcZKsUevyRt5yD8bBOevlm4h5JybWLWUtSXsQvQnQvLlYvcbwbILKBHwi1A2yEP8B61WWEY0DMu4DTzJXigZYiP8fSi9tTUW6pUtJcu6a3sPOp5BFrXTMD9w"}
                }
            ).then(res => {
                context.dispatch('setLoading', false);
                resolve(res.data);
            }).catch(err => {
                context.dispatch('setLoading', false);

                Message({
                    type: 'error',
                    message: err.response.data.message
                });
                if (err.response.status == 401) {
                    setTimeout(() => {
                        localStorage.clear()
                        window.location = '/login';
                    }, 1000);
                }

                reject(err);
            });
        });
    },
    /**
     * get方法，对应get请求
     * @param {String} url [请求的url地址]
     * @param {Object} params [请求时携带的参数]
     */
    get(url, params, context, token) {
        params.language = cache.getStr(Config.localLangage) ? cache.getStr(Config.localLangage).toLowerCase() : "zh-cn";
        let myTenantid = cache.get(Config.currentTenant) == null ? 1 : cache.get(Config.currentTenant).tenant_id;
        let myOrgId = cache.get(Config.currentTenant) == null ? 0 : cache.get(Config.currentTenant).org_id;
        context.dispatch('setLoading', true);
        return new Promise((resolve, reject) => {
            axios.get(url,
                {
                    params: params,
                    headers: {
                        Authorization: cache.getStr(Config.accessToken),
                        TenantId: myTenantid,
                        SdpTenantId: myTenantid,
                        OrgId: myOrgId,
                        'accept-language': params.language
                    }
                    //headers:{Authorization: "Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6IkFGRDNDNkMzOUVBQTA3QTZBRTY2Njg2MDFDMTMxM0NERDlFN0I3MzAiLCJ0eXAiOiJKV1QiLCJ4NXQiOiJyOVBHdzU2cUI2YXVabWhnSEJNVHpkbm50ekEifQ.eyJuYmYiOjE2Mjc5NTQ2NjAsImV4cCI6MTYyNzk5MDY2MCwiaXNzIjoiaHR0cHM6Ly90ZXN0LmFjY291bnQuYWlnb3N0YXIuY29tOjM0NDMiLCJhdWQiOlsiaHR0cHM6Ly90ZXN0LmFjY291bnQuYWlnb3N0YXIuY29tOjM0NDMvcmVzb3VyY2VzIiwiYXBpLWFkbWluIl0sImNsaWVudF9pZCI6ImFpZ28uY29tbXVuaXR5RGV0YWlsLnRlc3QiLCJzdWIiOiIxMjUwMjc2MDU3Mzc5MTE1MDA4IiwiYXV0aF90aW1lIjoxNjI3NjI2OTU2LCJpZHAiOiJsb2NhbCIsIm5hbWUiOiJib2IiLCJjb3VudHJ5X2NvZGUiOiJDTiIsInNjb3BlIjpbIm9wZW5pZCIsInByb2ZpbGUiLCJhcGktYWRtaW4iXSwiYW1yIjpbInB3ZCJdfQ.ALO2aa2S3E42zn3PW4r1WLyxw9w5pvB47xokr51ge4nPrJw82SzsiT1cIyJ8aUZgInboAsLM_RoFLlh96Rd0q_oGGQmsG7sjPDsdgOrs1jJrjKGFnnz2bDCDR_hooY3hOh4O4ykv2J8khDJP8bfcuWqoM6nTj8Lwu8H9GCnhhaYezmpiHOxXJfkw-w0yfqRirDCDkRbPar3VQqzXllN1smtzhxyVpGrcZKsUevyRt5yD8bBOevlm4h5JybWLWUtSXsQvQnQvLlYvcbwbILKBHwi1A2yEP8B61WWEY0DMu4DTzJXigZYiP8fSi9tTUW6pUtJcu6a3sPOp5BFrXTMD9w"}
                }
            ).then(res => {
                context.dispatch('setLoading', false);
                resolve(res.data);
            }).catch(err => {
                context.dispatch('setLoading', false);

                Message({
                    type: 'error',
                    message: err.response.data.message
                });
                if (err.response.status == 401) {
                    setTimeout(() => {
                        localStorage.clear()
                        window.location = '/login';
                    }, 1000);
                }

                reject(err);
            });
        });
    },

    patch(url, params, context, token) {
        params.language = localStorage.language;
        let myTenantid = cache.get(Config.currentTenant) == null ? 1 : cache.get(Config.currentTenant).tenant_id;
        let myOrgId = cache.get(Config.currentTenant) == null ? 0 : cache.get(Config.currentTenant).org_id;
        context.dispatch('setLoading', true);
        return new Promise((resolve, reject) => {
            axios.patch(url, params,
                {
                    params: params,
                    headers: {
                        Authorization: cache.getStr(Config.accessToken),
                        TenantId: myTenantid,
                        SdpTenantId: myTenantid,
                        OrgId: myOrgId
                    }
                }
            ).then(res => {
                context.dispatch('setLoading', false);
                resolve(res.data);
            }).catch(err => {
                context.dispatch('setLoading', false);

                Message({
                    type: 'error',
                    message: err.response.data.message
                });
                if (err.response.status == 401) {
                    setTimeout(() => {
                        localStorage.clear()
                        window.location = '/login';
                    }, 1000);
                }
                reject(err);
            });
        });
    },


    delete(url, params, context, token) {
        params.language = localStorage.language;
        let myTenantid = cache.get(Config.currentTenant) == null ? 1 : cache.get(Config.currentTenant).tenant_id;
        let myOrgId = cache.get(Config.currentTenant) == null ? 0 : cache.get(Config.currentTenant).org_id;
        context.dispatch('setLoading', true);
        return new Promise((resolve, reject) => {
            axios.delete(url,
                {
                    params: params,
                    headers: {
                        Authorization: cache.getStr(Config.accessToken),
                        TenantId: myTenantid,
                        SdpTenantId: myTenantid,
                        OrgId: myOrgId
                    }
                }
            ).then(res => {
                context.dispatch('setLoading', false);
                resolve(res.data);
            }).catch(err => {
                context.dispatch('setLoading', false);

                Message({
                    type: 'error',
                    message: err.response.data.message
                });
                if (err.response.status == 401) {
                    setTimeout(() => {
                        localStorage.clear()
                        window.location = '/login';
                    }, 1000);
                }
                reject(err);
            });
        });
    },
    /**
     * post方法，对应post请求
     * @param {String} url [请求的url地址]
     * @param {Object} params [请求时携带的参数]
     */
    put(url, params, context) {
        url = decodeURI(encodeURI(url).replace(/%E2%80%8B/g, ''))
        params.language = localStorage.language;
        let myTenantid = cache.get(Config.currentTenant) == null ? 1 : cache.get(Config.currentTenant).tenant_id;
        let myOrgId = cache.get(Config.currentTenant) == null ? 0 : cache.get(Config.currentTenant).org_id;
        context.dispatch('setLoading', true);
        return new Promise((resolve, reject) => {
            axios.put(url, params,
                {
                    headers: {
                        Authorization: cache.getStr(Config.accessToken),
                        TenantId: myTenantid,
                        SdpTenantId: myTenantid,
                        OrgId: myOrgId
                    }
                }
            )
                .then(res => {
                    context.dispatch('setLoading', false);
                    resolve(res.data);
                })
                .catch(err => {
                    context.dispatch('setLoading', false);
                    Message({
                        type: 'error',
                        message: err.response.data.message
                    });
                    if (err.response.status == 401) {
                        setTimeout(() => {
                            localStorage.clear()
                            window.location = '/login';
                        }, 1000);
                    }
                    reject(err);
                });
        });
    },
    /**
     * post方法，对应post请求
     * @param {String} url [请求的url地址]
     * @param {Object} params [请求时携带的参数]
     */
    post(url, params, context) {
        url = decodeURI(encodeURI(url).replace(/%E2%80%8B/g, ''))
        params.language = localStorage.language;
        let myTenantid = cache.get(Config.currentTenant) == null ? 1 : cache.get(Config.currentTenant).tenant_id;
        let myOrgId = cache.get(Config.currentTenant) == null ? 0 : cache.get(Config.currentTenant).org_id;
        context.dispatch('setLoading', true);
        return new Promise((resolve, reject) => {
            axios.post(url, params,
                {
                    headers: {
                        Authorization: cache.getStr(Config.accessToken),
                        TenantId: myTenantid,
                        SdpTenantId: myTenantid,
                        OrgId: myOrgId
                    }
                }
            )
                .then(res => {
                    context.dispatch('setLoading', false);
                    resolve(res.data);
                })
                .catch(err => {
                    context.dispatch('setLoading', false);
                    Message({
                        type: 'error',
                        message: err.response.data.message
                    });
                    if (err.response.status == 401) {
                        setTimeout(() => {
                            localStorage.clear()
                            window.location = '/login';
                        }, 1000);
                    }
                    reject(err);
                });
        });
    },
    /**
     * postFormData方法，对应post请求，用来提交文件+数据
     * @param {String} url [请求的url地址]
     * @param {Object} params [请求时携带的参数]
     */
    postFormData(url, params) {
        return new Promise((resolve, reject) => {
            axios({
                headers: {
                    'Content-Type': 'multipart/form-data'// ;boundary=----WebKitFormBoundaryQ6d2Qh69dv9wad2u
                },
                transformRequest: [function (data) { // 在请求之前对data传参进行格式转换
                    const formData = new FormData();
                    Object.keys(data).forEach(key => {
                        formData.append(key, data[key]);
                    });
                    return formData;
                }],
                url,
                method: 'post',
                data: params
            }).then(res => {
                resolve(res.data);
            }).catch(err => {
                Message({
                    type: 'error',
                    message: err.response.data.Message
                });
                reject(err);

            });
        });
    },

    postFile(url, params, context) {
        url = decodeURI(encodeURI(url).replace(/%E2%80%8B/g, ''))
        params.language = localStorage.language;
        let myTenantid = cache.get(Config.currentTenant) == null ? 1 : cache.get(Config.currentTenant).tenant_id;
        let myOrgId = cache.get(Config.currentTenant) == null ? 0 : cache.get(Config.currentTenant).org_id;
        context.dispatch('setLoading', true);
        return new Promise((resolve, reject) => {
            axios.post(url,
                params,
                {
                    responseType: 'blob', //返回是个文件
                    headers: {
                        Authorization: cache.getStr(Config.accessToken),
                        TenantId: myTenantid,
                        SdpTenantId: myTenantid,
                        OrgId: myOrgId
                    }
                }
            ).then(res => {
                this.download(res);
                context.dispatch('setLoading', false);
                resolve(res.data);
            }).catch(err => {
                context.dispatch('setLoading', false);
                Message({
                    type: 'error',
                    message: err.response.data.message
                });
                if (err.response.status == 401) {
                    setTimeout(() => {
                        localStorage.clear()
                        window.location = '/login';
                    }, 1000);
                }
                reject(err);
            });
        });
    }

};

其中const fileName = res.headers["content-disposition"].split(";")[2].split("=")[1].replace("UTF-8''", "");正常接口获取不到，需要在后端服务配置这个，跨域策略：

在setup.cs中的ConfigureServices方法中

services.AddCors(options =>
            {
                options.AddPolicy(
                    _allowSpecificOriginsPolicyName,
                    policy =>
                    {
                        //string[] opl = Configuration.GetSection("OriginPolicyList").Get<string[]>();
                        //foreach (var item in opl)
                        //{
                        //    policy.WithOrigins(item);
                        //}
                        policy.AllowAnyHeader().SetIsOriginAllowed(_ => true)
                            .AllowAnyMethod().WithExposedHeaders("Content-Disposition");//允许浏览器访问额外的自定义头;
                    });
            });

.netcore 接口实现：

/// <summary>
        /// 下载模板
        /// </summary>
        /// <returns></returns>
        [HttpGet("DownloadImportTemp")]
        [Permission(ModuleCodes.UserList, SimpleOperation.View)]
        public IActionResult DownloadImportTemp(string selType)
        {
            FileStreamResult file = null;
            FileStream fileStream;
            string filePath = string.Empty;
            switch (selType)
            {
                case "RankLvl":
                    filePath = _webHostEnvironment.WebRootPath + "/TempFile/UserRankTemp.xlsx";
                    fileStream = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite);
                    file = File(fileStream, "application/octet-stream", "导入岗级导入模板(Import Rank Level Template).xlsx");

                    break;
                case "UserType":
                    filePath = _webHostEnvironment.WebRootPath + "/TempFile/UserTalentTypeTemp.xlsx";
                    fileStream = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite);
                    file = File(fileStream, "application/octet-stream", "人才类型导入模板(Import Talent Type Template).xlsx");
                    break;
            }
            return file;
        }

_webHostEnvironment.WebRootPath是获取项目中wwwroot路径

_webHostEnvironment需要在构造函数注入

private readonly IWebHostEnvironment _webHostEnvironment;
public UserApiController(
           
            IWebHostEnvironment webHostEnvironment,
            )
        {
           
            _webHostEnvironment = webHostEnvironment;
            
        }