过滤器

  public void destroy() {
    }

    public void doFilter(javax.servlet.ServletRequest req, javax.servlet.ServletResponse resp, javax.servlet.FilterChain chain) throws javax.servlet.ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse respon = (HttpServletResponse) resp;
        request.setCharacterEncoding("utf-8");
        respon.setContentType("text/html;charset=utf-8");
        chain.doFilter(req, resp);
    }

    public void init(javax.servlet.FilterConfig config) throws javax.servlet.ServletException {

    }

}
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web.xml
------------------------------------------------------------------------------------------

<filter>
    <filter-name>Filter</filter-name>
    <filter-class>Filter</filter-class>
</filter>
<filter-mapping>
    <filter-name>Filter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>