JSF Seam @RequestParameter 文件/图像
我有一个支持 Bean，其中我读取未绑定到组件的参数。 Seam 提供了读取参数的功能。我使用
@RequestParameter private String param1;
这种方式，他不会在验证错误时跳过我的操作方法，就像我使用时一样
，因为我不想渲染 HTML 响应，而是重用业务逻辑。相反，我抓取响应流并自己编写渲染的响应，FacesContext ctx = FacesContext.getCurrentInstance();
final HttpServletResponse resp = (HttpServletResponse)ctx.getExternalContext().getResponse();
resp.getOutputStream().write(xml.getBytes());
resp.getOutputStream().flush();
resp.getOutputStream().close();
ctx.responseComplete(); // render response phase done
我尝试从 HttpServletRequest inputStream 读取文件，但该文件已经是空的。有没有办法仍然从 JSF 获取“文件”。我可以使用一个单独的 servlet 并在那里处理它，但这会稍微破坏我构建界面其余部分的方式。
感谢您的任何建议。
编辑：只是为了输入流代码的完整性
final HttpServletRequest request = (HttpServletRequest)ctx.getExternalContext().getRequest();
ServletInputStream stream = request.getInputStream();
int byt = stream.read(); // byt was -1
编辑编辑：很抱歉这篇长文章。现在我做了一个单独的servlet。即使 Firefug 说我传输了文件，我也得到一个空的输入流。怎么可能是空的呢？
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
boolean isMultipart = ServletFileUpload.isMultipartContent(req);
ServletInputStream stream= req.getInputStream();
int test = stream.read(); // test == -1
该 servlet 代码在单独的项目中运行良好，因此过滤器链中的 JSF/Seam servlet 之一必须删除数据。如果有人提示哪一个或如何检查。
i have a Backing Bean in which i read parameter which are not bound to a component. Seam offered that to read get parameter. I used
@RequestParameter private String param1;
this way he doesn't skip my action method on a validation error, like when i used
<param name="param1" value="#{myBean.param1}" />
, because i don't want to render HTML responses but reuse the business logic. Instead i grab the response stream and write the rendered response myself
FacesContext ctx = FacesContext.getCurrentInstance();
final HttpServletResponse resp = (HttpServletResponse)ctx.getExternalContext().getResponse();
resp.getOutputStream().write(xml.getBytes());
resp.getOutputStream().flush();
resp.getOutputStream().close();
ctx.responseComplete(); // render response phase done
I tried to read the file from the HttpServletRequest inputStream but that was already empty. Is there a way to still get the "file" from JSF. I could use a separate servlet and handle it there, but that would break a little bit how i build the rest of the interface.
Thx for any advice.
Edit: Just for completeness the code for the input stream
final HttpServletRequest request = (HttpServletRequest)ctx.getExternalContext().getRequest();
ServletInputStream stream = request.getInputStream();
int byt = stream.read(); // byt was -1
Edit Edit: Sorry for the long post. Now i made a separate servlet. There i also get an empty input Stream even though Firefug said i transmitted the file. How can that be empty?
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
boolean isMultipart = ServletFileUpload.isMultipartContent(req);
ServletInputStream stream= req.getInputStream();
int test = stream.read(); // test == -1
That servlet code works fine in a separate project, so one of the JSF/Seam servlets in the filter chain has to remove the data. If someone has a hint which one or how to check.
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SeamFilter 或者更准确地说 MultipartFilter 正在检查每个请求是否是 POST 和多部分请求。如果是这样，他们会将请求包装在 MultipartRequest 中，并将文件放入单独的参数映射中。
The SeamFilter or more exactly the MultipartFilter was checking every request if it is a POST and multipart request. If so, they wrapped the request in a MultipartRequest and put the files in a separate parameter map.