Can not find a java.io.InputStream with the name [downloadFile] in the invocation stack问题解决
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具体异常是这句话:
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.文件路径不对,根本就没有取到文件。这种情况下,可以将获得InputStream的那条语句放在system.out.println()中输出一下,若为null,那就是路径不对了,或者说得准确些就根本没有找到文件。
2.在action中没有写配置文件中"<param name="inputName">"后面属性的那个get方法.
当以上两种情况都正确的情况下,问题就在这里了:
当采用 return ServletActionContext.getServletContext().getResourceAsStream("...") 这种方法获得输入流的时候,要保证文件位置在 ServletContext 当中,就是说要在当前的应用上下文中,
如果想要获得外部文件 譬如 D盘中的某个文件,那么就要自己创建输入流才可以,如:
则OK!!
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