java 在 Struts2 中使用流结果
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Using Stream Result with Struts2
提问by Vincent Ramdhanie
I am attempting to use a Stream Result to return an image from a struts2 application. I seem to be having problem with configuring the action. Here is the configuration:
我正在尝试使用流结果从 struts2 应用程序返回图像。我似乎在配置操作时遇到问题。这是配置：
<result name="success" type="stream">
<param name="contentType">image/jpeg</param>
<param name="inputName">inputStream</param>
<param name="contentDisposition">filename="${filename}"</param>
<param name="bufferSize">1024</param>
</result>
The problem seem to be the inputName parameter which according to the docs is:
问题似乎是 inputName 参数，根据文档是：
the name of the InputStream property from the chained action (default = inputStream).
来自链式操作的 InputStream 属性的名称（默认值 = inputStream）。
I am not sure what name I should put there. The error I get is:
我不确定我应该把什么名字放在那里。我得到的错误是：
Can not find a java.io.InputStream with the name [inputStream] in the invocation stack.
在调用堆栈中找不到名称为 [inputStream] 的 java.io.InputStream。
Has anyone used this before? Any advice?
有没有人以前用过这个？有什么建议吗？
Thanks.
谢谢。
回答by
I believe you have the contentDisposition wrong, it should be:
我相信你的 contentDisposition 错了，应该是：
<param name="contentDisposition">attachment; filename="${filename}"</param>
(Chris)
(克里斯)
回答by Vincent Ramdhanie
I found thiswhich explained that the InputStreamhas to be created by me. It makes sense that I create an InputStreamfrom the file that I want the user to download and then pass the Stream to the result. I guess that's my answer.
我发现这解释了InputStream必须由我创建。我InputStream从希望用户下载的文件中创建一个，然后将 Stream 传递给结果是有道理的。我想这就是我的答案。
回答by Vincent Ramdhanie
Inputname defines the name of the method that outputs the "stream"
Inputname 定义输出“流”的方法的名称
public InputStream getInputStream () { return new ByteArrayInputStream ( _bytes ); }
public InputStream getInputStream () { return new ByteArrayInputStream ( _bytes ); }
