Can not find a java.io.InputStream with the name [downloadFile] in the invocation stack問題解決
具體異常是這句話：
Can not find a java.io.InputStream with the name [downloadFile] in the invocation stack. Check the <param name="inputName"> tag specified for this action.
1.檔案路徑不對，根本就沒有取到檔案。這種情況下，可以將獲得InputStream的那條語句放在system.out.println()中輸出一下，若為null，那就是路徑不對了，或者說得準確些就根本沒有找到檔案。 2.在action中沒有寫配置檔案中"<param name="inputName">"相關推薦
Can not find a java.io.InputStream with the name [downloadFile] in the invocation stack.
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具體異常是這句話： Can not find a java.io.InputStream with the name [downloadFile] in the invocation stack. Check the <param name="inputName">
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