Java Spring boot Angular2，返回JSON格式的PDF

我有一个SpringBootRESTAPI，它必须返回PDF。我已将PDF转换为字节数组，然后在将其返回到客户端之前将其编码为base64

以下是我的界面：

@ApiOperation(value = "Update an existing form", notes = "Update an existing form ", response = Void.class, tags={  })
    @ApiResponses(value = {
            @ApiResponse(code = 200, message = "form response", response = Void.class),
            @ApiResponse(code = 200, message = "unexpected error", response = Void.class) })
    @RequestMapping(value = "/forms/{formId}/submissions/{submissionId}/pdf",
            method = RequestMethod.GET)
    ResponseEntity<Resource> pdf(
            @ApiParam(value = "Id of the form that needs to be updated", required = true) @PathVariable("formId") Long formId,
            @ApiParam(value = "Id of the submission that needs to be updated", required = true) @PathVariable("submissionId") Long submissionId,
            @ApiParam(value = "token to be passed as a header", required = true) @RequestHeader(value = "token", required = true) String token
    );

我在有效负载中收到的PDF如下所示：

当我打开下载的PDF时，它只包含一个空页面，而真正的PDF包含文本。知道发生了什么吗？我觉得这是关于编码的

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解决方案

我不得不在我的服务中更改我的GET请求。我已经将它添加到我的请求

responseType:ResponseContentType.Blob

return this.http.get(this.formsUrl + "/" + formId + "/submissions/" + submissionId + "/pdf", {headers: headers, responseType: ResponseContentType.Blob})
        .toPromise()
        .then(res => res)
        .catch(this.handleError);

return this.http.get(this.formsUrl + "/" + formId + "/submissions/" + submissionId + "/pdf", {headers: headers, responseType: ResponseContentType.Blob})
        .toPromise()
        .then(res => res)
        .catch(this.handleError);

解决方案

我不得不在我的服务中更改我的GET请求。我已经将它添加到我的请求
responseType:ResponseContentType.Blob

return this.http.get(this.formsUrl + "/" + formId + "/submissions/" + submissionId + "/pdf", {headers: headers, responseType: ResponseContentType.Blob})
        .toPromise()
        .then(res => res)
        .catch(this.handleError);

return this.http.get(this.formsUrl + "/" + formId + "/submissions/" + submissionId + "/pdf", {headers: headers, responseType: ResponseContentType.Blob})
        .toPromise()
        .then(res => res)
        .catch(this.handleError);