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;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("设置编码开始");
encoding = filterConfig.getInitParameter("encoding");
}
@Override
public 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);
}
@Override
public void destroy() {
encoding = null;
}
}