的Java BLOBSTORE和谷歌SPI AppEngine上端点

问题描述：

我使用本地主机：8080/_ah/API /探险谷歌探索：我不断收到的Java BLOBSTORE和谷歌SPI AppEngine上端点

{ 
"error": { 
    "message": "com.google.appengine.repackaged.org.codehaus.jackson.map.JsonMappingException: Can not construct instance of javax.servlet.http.HttpServletResponse, problem: abstract types can only be instantiated with additional type information\n at [Source: N/A; line: -1, column: -1]", 
    "code": 400, 
    "errors": [ 
    { 
    "domain": "global", 
    "reason": "badRequest", 
    "message": "com.google.appengine.repackaged.org.codehaus.jackson.map.JsonMappingException: Can not construct instance of javax.servlet.http.HttpServletResponse, problem: abstract types can only be instantiated with additional type information\n at [Source: N/A; line: -1, column: -1]" 
    } 
    ] 
}

我的谷歌SPI代码是：

@ApiMethod(name = "findBillImage", httpMethod = ApiMethod.HttpMethod.GET) 
public void findImage(HttpServletResponse httpServletResponse , @Named("blobkey") String blobKeyValue) throws IOException { 
    BlobKey blobKey = new BlobKey(blobKeyValue); 
    BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();   
    blobstoreService.serve(blobKey, httpServletResponse);  
}

随时随地我试图写任何东西到HttpServletResponse我得到这个错误..我失去了为什么我不能写入httpServletResponse

答

Soooo .. 一个对我而言，swer真的是'设计'。

因为我是谷歌应用程序引擎实现“休息”...我不应该修改HttpResponse返回一个“图像”。

因此，将图像“提供”回HttpResponse并不理想。我应该与存储URL直接暴露形象客户：

https://storage.cloud.google.com/myapp.appspot.com/20160603_154924.jpg

不能说我“100％”这样的答案，但是从我读什么，我相信这是正确的。

的Java BLOBSTORE和谷歌SPI AppEngine上端点

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