前端直连下载文件

src/util/http_util.js

@@ -819,6 +819,46 @@ let uploadOSSProgress = (filename, bucket, file, progressFunction) => {
         });
     });
 };
+/**
+ * 直连oss下载，数据较大时需要配合进度条使用
+ * @param {*} bucket 
+ * @param {*} filename 
+ * @param {*} originFileName 
+ * @returns 
+ */
+let downloadOSS = (bucket, filename, originFileName) => {
+    return new Promise((resolve, reject) => {
+        fetch(`api/rest/file/getDownloadUrl?bucket=${bucket}&filename=${filename}`, {
+            headers: new Headers(addHeaders({}))
+        }).then(res => {
+            if (res.status == 200) {
+                return res.json();
+            } else {
+                console.log(res.statusText);
+                reject(HTTP_STATUS);
+            }
+        }).then(res => {
+            if (res.code == 9000) {
+                return fetch(res.data, {
+                    method: "GET",
+                })
+            } else {
+                return Promise.reject({ err: res.message });
+            }
+        }).then(res => res.blob().then(blob => {
+            filename = originFileName|| filename;
+            let a = document.createElement('a');
+            let url = window.URL.createObjectURL(blob);
+            a.href = url;
+            a.download = filename;
+            a.click();
+            window.URL.revokeObjectURL(url);
+            resolve(res.data);
+        })).catch(err => {
+            reject(err);
+        });
+    });
+}
 //#endregion
 
 //#region sse支持
@@ -967,5 +1007,7 @@ export {
     httpSSERequestPoly,
     uploadOSS,
     uploadOSSProgress,
-    fetchEventSource
+    fetchEventSource,
+
+    downloadOSS
 }
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