使用AngularJS从服务器下载和保存文件 [英] Downloading and saving files from server using AngularJS

问题描述

我遇到了以下问题，但找不到解决方法. 我使用Spring Boot创建了终结点，当我使用 Postman 时，我收到了有关正文请求的响应.

I've got following issue and I can't find resolution. I created endpoint with Spring Boot and when I'm using Postman I'm getting response with image on body request.

但是当我尝试使用Angular和Blob和FileSaver在计算机上下载并保存文件时，保存的文件无法读取.

But when I'm trying download and save file on computer using Angular and Blob and FileSaver my saved file is unable to read.

这是我的角度控制器:

vm.download = function (filename) {
    console.log("Start download. File name:", filename);
    $http.get('api/files/download/' + filename)
        .then(function (response) {
            console.log(data);
            var data = new Blob([response.data], {type: 'image/jpeg;charset=UTF-8'});
            FileSaver.saveAs(data, filename);
        })
}

这是我的终点:

@RequestMapping(value = "/files/download/{id:.*}", method = RequestMethod.GET)
@ResponseBody
@Timed
public void DownloadFiles(@PathVariable String id, HttpServletRequest request, HttpServletResponse response) throws IOException {

    MongoClient mongoClient = new MongoClient();
    DB mongoDB = mongoClient.getDB("angularspingproject");


    BasicDBObject query = new BasicDBObject();
    query.put("filename", id);

    GridFS fileStore = new GridFS(mongoDB, "fs");
    GridFSDBFile gridFSDBFile = fileStore.findOne(query);

    if (gridFSDBFile != null && id.equalsIgnoreCase((String) gridFSDBFile.getFilename())) {
        try {
            response.setContentType(gridFSDBFile.getContentType());
            response.setContentLength((new Long(gridFSDBFile.getLength()).intValue()));
            response.setHeader("content-Disposition", "attachment; filename=" + gridFSDBFile.getFilename());

            IOUtils.copyLarge(gridFSDBFile.getInputStream(), response.getOutputStream());
        } catch (IOException e) {
            throw new RuntimeException("IOError writting file to output stream");
        }
    }
}

我的标题:

Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Content-Length: 316707
Content-Type: image/jpeg;charset=UTF-8
Pragma: no-cache
Server:Apache-Coyote/1.1
X-Application-Context : angularspingproject:8080
X-Content-Type-Options : nosniff
X-XSS-Protection: 1; mode=block
content-Disposition: attachment; filename=main_page.jpg

@编辑 问题已解决

    vm.download = function (filename) {
        $http.get('api/files/download/' + filename, {responseType:'blob'})
            .then(function (response) {
                console.log(response);
                var data = new Blob([response.data], {type: 'image/jpeg;charset=UTF-8'});
                FileSaver.saveAs(data, filename);
            })
    }

我在$ http

推荐答案

我猜想您没有从$ http.get调用中获得字节数组.尝试添加:

I'd guess that you're not getting a byte array back from your $http.get call. Try adding:

vm.download = function (filename) {
var config = {headers: {
        'Accept': "image/jpeg"
    }
};
$http.get('api/files/download/' + filename, config).then(function (response)             { 
       var myBuffer= new Uint8Array( response.data );

    var data = new Blob([myBuffer], {type: 'image/jpeg;charset=UTF-8'});
    FileSaver.saveAs(data, filename);
        })
}

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