Question

我正在使用jdev 11.1.1.5.0.。在我的用例中，我想创建一个下载链接。当用户单击链接时，该文件应自动下载（如下载servlet）。

代码如下：

HttpServletResponse response= (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();                                                         response.setContentType("text/plain");                                                          response.setHeader("Content-Disposition","attachment;filename="+part.getFileName());     response.setContentType("text/plain");                                                  response.setHeader("ContentDisposition","attachment;filename="+part.getFileName());        InputStreaminput=part.getInputStream();                                                     int read=0;        
  byte[] bytes = new byte[1024];                                                    OutputStream os =response.getOutputStream();    


while((read=input.read(bytes))!=-1)
{os.write(bytes, 0, read);
}
os.flush();                                                   
os.close();

但它不起作用。我的要求是想要创建动态链接（URL），当用户点击链接时，文件就会被下载。有没有其他方法可以做到这一点？感谢。

Answer 1

创建commandLink并向其提供File Download Action Listener并向该侦听器提供代码

    <af:commandButton text="Say Hello">
      <af:fileDownloadActionListener filename="hello_txt"
                                contentType="text/plain; charset=utf-8"
                                method="#{bean.sayHello}"/>
    </af:commandButton>


public void sayHello(FacesContext context, OutputStream out) throws IOException
{
  OutputStreamWriter w = new OutputStreamWriter(out, "UTF-8");
  w.write("Hi there!");
  // The stream is automatically closed, but since we wrapped it,
  // we'd better flush our writer
  w.flush();
}

如何在ADF中创建下载链接？

1 个答案: