解決思路:
配置web工程web.xml加上
? <mime-mapping>
??? <extension>doc</extension>
??? <mime-type>application/msword</mime-type>
? </mime-mapping>
? <mime-mapping>
??? <extension>xls</extension>
??? <mime-type>application/vnd.ms-excel</mime-type>
? </mime-mapping>
修改后非常注意的要清空緩存這樣才會彈出保存還是打開的窗口否則打開還是亂碼.