将eclipse的编码设置成UTF-8
1.Window -> Preferences -> General -> Workspace -> Text file encoding，选择Other选项的UTF-8
2.Window -> Preferences -> General -> Content Types 选择Text，下边Default encoding写为：UTF-8，点Update按钮。
展开Text，把"Java Properties File"、"JSP"的"ISO-8859-1"统统设置为UTF-8
3.Window -> Preferences -> Web -> JSP Files -> Encoding选择ISO 10646/Unicode(UTF-8)，点Apply按钮