今天将以前做的一个web项目从不笔记本上移到台式机上，import项目后出现“The method setCharacterEncoding(String) is undefined for the type HttpServle”，导入tomcat下的lib包问题依旧。后来将lib包在Order and Export中的位置上调（如下图）就可以了。可能是servlet包冲突导致。
----除了是jar位置，也可能是jar重复导致。
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