解决前端传参到后台的字符集编码问题！！!
第一种：---java的web.xml中加上字符集过滤 （推荐使用）

<filter><filter-name>SpringEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param><init-param><param-name>forceEncoding</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>SpringEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>



第二种：有局限性！当前有效

String str = new String(keyWord.getBytes("iso-8859-1"),"UTF-8");