过滤器解决中文乱码

过滤器的原理图：

第一步：新建包cn.java.filter ;

第二步：建立类EncodingFilter,实现Filter接口，编写过滤器。

public class EncodingFilter implements Filter {     @Override     public void doFilter(ServletRequest reqeust, ServletResponse response, FilterChain chain)             throws IOException, ServletException {         reqeust.setCharacterEncoding("utf-8");         response.setCharacterEncoding("utf-8");         response.setContentType("text/html;charset=utf-8");         chain.doFilter(reqeust, response);     } }

第三步：配置web.xml;过滤器放在Servlet前面。因为是先拦截。

<filter>   <filter-name>encodingFilterfilter-name>   <filter-class>cn.java.filters.EncodingFilterfilter-class>   filter>   <filter-mapping>   <filter-name>encodingFilterfilter-name>   <url-pattern>/*url-pattern>   filter-mapping>