{"id":208244,"date":"2025-07-08T15:49:51","date_gmt":"2025-07-08T07:49:51","guid":{"rendered":"https:\/\/server.hk\/cnblog\/208244\/"},"modified":"2025-07-08T15:49:51","modified_gmt":"2025-07-08T07:49:51","slug":"%e4%bd%bf%e7%94%a8multipartrequest%e4%b8%8a%e4%bc%a0%e6%96%87%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208244\/","title":{"rendered":"\u4f7f\u7528MultipartRequest\u4e0a\u4f20\u6587\u4ef6"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u4f7f\u7528MultipartRequest\u4e0a\u4f20\u6587\u4ef6<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-30 17:39:34<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662f\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300a\u4f7f\u7528MultipartRequest\u4e0a\u4f20\u6587\u4ef6\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u6b63\u5728\u4f7f\u7528 goa v3 \u8bbe\u8ba1\u4e00\u4e2a\u7aef\u70b9\uff0c\u5141\u8bb8\u6211\u4f7f\u7528 multipart\/form-data<\/code> post \u8bf7\u6c42\u4e0a\u4f20\u6587\u4ef6\uff08\u66f4\u51c6\u786e\u5730\u8bf4\u662f\u56fe\u50cf\uff09\u3002 \u6211\u5df2\u58f0\u660e\u4ee5\u4e0b service<\/code>\uff1a<\/p>\n

var _ = service(\"images\", func() {\n    http(func() {\n        path(\"\/images\")\n    })\n\n    method(\"upload\", func() {  \n        http(func() {\n            post(\"\/\")\n            multipartrequest()\n        })\n\n        payload(func() {\n            description(\"multipart request payload\")\n            attribute(\"file\", bytes, \"file\")\n        })\n\n        result(imagelist)\n    })\n})<\/pre>\n
\u6211\u8fd0\u884c goa gen<\/code> \u548c goa example<\/code> \u547d\u4ee4\u6765\u751f\u6210\u6837\u677f\u4ee3\u7801\u3002\u9664\u4e86 cmd<\/code> \u76ee\u5f55\u4e4b\u5916\uff0cexample<\/code> \u4ee3\u7801\u8fd8\u751f\u6210 images.go<\/code> \u4e3b\u6587\u4ef6\u548c multipart.go<\/code> \u6587\u4ef6\u6765\u58f0\u660e\u7f16\u7801\u5668\u548c\u89e3\u7801\u5668\u903b\u8f91\uff0c\u4f8b\u5982\uff1a<\/p>\n
func ImagesUploadDecoderFunc(mr *multipart.Reader, p **images.UploadPayload) error {\n    \/\/ Add multipart request decoder logic here\n    return nil\n}<\/pre>\n
\u6211\u53ef\u4ee5\u4f7f\u7528 mr.nextpart()<\/code> \u5e76\u663e\u7136\u83b7\u5f97\u5bf9\u56fe\u50cf\u6587\u4ef6\u7684\u5f15\u7528\uff0c\u4f46\u6211\u4ecd\u7136\u4e0d\u786e\u5b9a\u5e94\u8be5\u5982\u4f55\u5c06\u5176\u6620\u5c04\u5230 images.uploadpayload<\/code> \u7c7b\u578b\u4e2d\u7684 bytes<\/code> \u5b57\u6bb5\uff08\u6216\u8005\u4e5f\u8bb8\u6211\u5e94\u8be5\u58f0\u660e\u53e6\u4e00\u79cd\u7c7b\u578b\u7684\u5b57\u6bb5\u6765\u5904\u7406\u6587\u4ef6\uff1f\uff1f\uff09\u3002<\/p>\n
\u6211\u5728 goa \u6587\u6863\u4e2d\u627e\u4e0d\u5230\u4efb\u4f55\u793a\u4f8b\u3002<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u597d\u5427\uff0c\u6211\u7ec8\u4e8e\u660e\u767d\u4e86 multipart.reader<\/code> \u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff0c\u5e76\u4e14\u6211\u60f3\u51fa\u4e86\u4e00\u4e2a\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n
\u9996\u5148\u8ba9\u6211\u4eec\u6f84\u6e05\u4e00\u4e0b\uff0c\u4e0e goa \u901a\u5e38\u7684\u5de5\u4f5c\u65b9\u5f0f\u4e0d\u540c\uff08\u4f7f\u7528 payload<\/code> \u5b57\u6bb5\u201c\u81ea\u52a8\u201d\u6620\u5c04\u8bf7\u6c42\u53c2\u6570\uff09\uff0c\u4f7f\u7528 multipartrequest()<\/code>\uff0c\u6211\u5fc5\u987b\u81ea\u5df1\u8fdb\u884c\u6620\u5c04\uff0c\u56e0\u6b64 payload<\/code> \u5b9e\u9645\u4e0a\u53ef\u4ee5\u6709\u4efb\u4f55\u7ed3\u6784\u3002<\/p>\n
\u5c31\u6211\u800c\u8a00\uff0c\u6211\u91cd\u65b0\u5b9a\u4e49\u4e86 payload<\/code> \u7ed3\u6784\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
\/\/ imageupload single image upload element\nvar imageupload = type(\"imageupload\", func() {\n    description(\"a single image upload type\")\n    attribute(\"type\", string)\n    attribute(\"bytes\", bytes)\n    attribute(\"name\", string)\n})\n\n\/\/ imageuploadpayload is a list of files\nvar imageuploadpayload = type(\"imageuploadpayload\", func() {\n    description(\"image upload payload\")\n\n    attribute(\"files\", arrayof(imageupload), \"collection of uploaded files\")\n})<\/pre>\n
\u7b80\u800c\u8a00\u4e4b\uff0c\u6211\u60f3\u652f\u6301\u4e0a\u4f20\u591a\u4e2a\u6587\u4ef6\uff0c\u6bcf\u4e2a\u6587\u4ef6\u90fd\u6709\u5176 mime \u7c7b\u578b\u3001\u6587\u4ef6\u540d\u548c\u6570\u636e\u3002<\/p>\n
\u4e3a\u4e86\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u6211\u5b9e\u73b0\u4e86 multipart.go<\/code> \u89e3\u7801\u5668\u51fd\u6570\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
func ImagesUploadDecoderFunc(mr *multipart.Reader, p **images.ImageUploadPayload) error {\n    res := images.ImageUploadPayload{}\n\n    for {\n        p, err := mr.NextPart()\n        if err == io.EOF {\n            break\n        }\n\n        if err != nil {\n            fmt.Fprintln(os.Stderr, err)\n            return err\n        }\n\n        _, params, err := mime.ParseMediaType(p.Header.Get(\"Content-Disposition\"))\n        if err != nil {\n            \/\/ can't process this entry, it probably isn't an image\n            continue\n        }\n\n        disposition, _, err := mime.ParseMediaType(p.Header.Get(\"Content-Type\"))\n        \/\/ the disposition can be, for example 'image\/jpeg' or 'video\/mp4'\n        \/\/ I want to support only image files!\n        if err != nil || !strings.HasPrefix(disposition, \"image\/\") {\n            \/\/ can't process this entry, it probably isn't an image\n            continue\n        }\n\n        if params[\"name\"] == \"file\" {\n            bytes, err := ioutil.ReadAll(p)\n            if err != nil {\n                \/\/ can't process this entry, for some reason\n                fmt.Fprintln(os.Stderr, err)\n                continue\n            }\n            filename := params[\"filename\"]\n            imageUpload := images.ImageUpload{\n                Type:  &disposition,\n                Bytes: bytes,\n                Name:  &filename,\n            }\n            res.Files = append(res.Files, &imageUpload)\n        }\n    }\n    *p = &res\n    return nil\n}<\/pre>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a\u4f7f\u7528MultipartRequest\u4e0a\u4f20\u6587\u4ef6\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591aGolang\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-208244","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208244","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=208244"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208244\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208244"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}