SSH中发生异常java.lang.IllegalStateException: getOutputStream() has already been called for this response
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下载文件的时候发生异常！
java.lang.IllegalStateException: getOutputStream() has already been called for this response
response这个对象是Servlet自己管理的,之所以出现上面的错误：
1.几乎都说与Output之类其他的输出流相互排斥了。
2.Struts方法之间调用引起的。
因为：每个方法都返回的是一个ActionForward对象，而response是ActionForward对象参数，所以就会使response冲突！
在实际的例子中，需要在最后返回null就可以的了。
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