编写Servlet编码过滤器可以简化编码设置的问题。
在编写过滤器的时候，如果一个个去判断文件类型会显得麻烦和代码冗余，此时可将所有的静态资源文件放置于一个文件夹中进行统一处理。
废话不多说，献上代码
注意点：
response setContentType编码设置一定要放在判断css文件之后，不然css也会被这句设置成text/html类型，这样css文件是不起效果的！（css需要是text/css才对）放在判断之后就不会影响css的头文件格式了

@WebFilter(filterName = "CharactorFilter", urlPatterns = { "/*" }, initParams = {@WebInitParam(name = "encoding", value = "UTF-8") })
public class CharacterEncoding implements Filter {String encoding = null;@Overridepublic void init(FilterConfig filterConfig) throws ServletException {System.out.println("设置编码开始");encoding = filterConfig.getInitParameter("encoding");}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)throws IOException, ServletException {if (encoding != null) {servletRequest.setCharacterEncoding(encoding);servletResponse.setCharacterEncoding(encoding);}HttpServletRequest request = (HttpServletRequest) servletRequest;String url = request.getRequestURI();String contextPath = request.getContextPath();if (url.substring(contextPath.length()).contains("/static") || url.equals("index.jsp")) {filterChain.doFilter(servletRequest, servletResponse);return;}if (encoding != null) { // 注意response一定要放在判断css文件之后，不然css也会被这句设置成text/html类型！（css本来是text/css才对）servletResponse.setContentType("text/html; charset=" + encoding);}filterChain.doFilter(servletRequest, servletResponse);}@Overridepublic void destroy() {encoding = null;}}