Primefaces文件下载不起作用? [英] Primefaces File Download not working?

问题描述

试图使一个简单的文件下载正常工作，我得到的只是一个挂起的AJAX状态栏，仅此而已.我的后备Bean输出在准备和下载中呈现正确的名称.

Trying to get a simple file download working and all I am getting is a hanging AJAX status bar and that's it. My backing bean outputs render the correct name on the prep and the download.

我做错了吗?在我看来，这两种输出都是正确的.

Am I doing this wrong? both outputs seem to me to be correct.

JSF 2.0 Primefaces 3.4

JSF 2.0 Primefaces 3.4

        <h:form>
            <p:commandButton id="downloadLink" value="Download" actionListener="#{filemanagement.prepDownload}"> 
                <p:fileDownload value="#{filemanagement.download}" />
            </p:commandButton>
        </h:form>

后备豆:

private DefaultStreamedContent download;

public void setDownload(DefaultStreamedContent download) {
    this.download = download;
}

public DefaultStreamedContent getDownload() throws Exception {
    System.out.println("GET = " + download.getName());
    return download;
}

public void prepDownload() throws Exception {
    File file = new File("C:\\file.csv");
    InputStream input = new FileInputStream(file);
    ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
    setDownload(new DefaultStreamedContent(input, externalContext.getMimeType(file.getName()), file.getName()));
    System.out.println("PREP = " + download.getName());
}

推荐答案

请参见 Primefaces文档6.1

如果您想使用PrimeFaces commandButton和commandLink，请将ajax选项禁用为 fileDownload需要刷新整个页面才能显示文件.

If you’d like to use PrimeFaces commandButton and commandLink, disable ajax option as fileDownload requires a full page refresh to present the file.

<h:form>
  <p:commandButton id="downloadLink" value="Download" ajax="false" actionListener="#{filemanagement.prepDownload}">
    <p:fileDownload value="#{filemanagement.download}" />
  </p:commandButton>
</h:form>

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