Primefaces filedownload类实现错误

Question

当我在Primefaces UserGuide中实现primefaces FileDownload Class时，我的IDE显示set方法返回类型为void或更改为构造函数。

  

public FileDownloadController（）

public class FileBean {

private StreamedContent file;

public FileDownloadController() {
InputStream stream = this.getClass().getResourceAsStream("yourfile.pdf");
file = new DefaultStreamedContent(stream, "application/pdf",
"downloaded_file.pdf");
}
public StreamedContent getFile() {
return this.file;
}
}

究竟是什么问题。

Answer 1

这是因为你的班级有不同的名字来解决这个改变

    public FileDownloadController() to public FileBean()

Answer 2

将您的代码更改为此类..

package org.primefaces.examples.view;

 public class FileDownloadController {

private StreamedContent file;

public FileDownloadController() {        
    InputStream stream = ((ServletContext)FacesContext.getCurrentInstance().getExternalContext().getContext()).getResourceAsStream("/images/optimusprime.jpg");
    file = new DefaultStreamedContent(stream, "image/jpg", "downloaded_optimus.jpg");
}

public StreamedContent getFile() {
    return file;
}  
}