servlet filter中设置content-type无效

Question

整个网站就这一个过滤器，我想设置全局的ContentType为application/json; charset=utf-8，但这样子无效，如果在servlet中设置，即可以正常使用（但这样意味着每个servlet都要设置下，太麻烦）。我的过滤器代码如下

public class GlobalFilter implements Filter {
    public void destroy() {

    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("application/json; charset=utf-8");
        chain.doFilter(req, resp);
    }

    public void init(FilterConfig config) throws ServletException {

    }

}

Answer 1

filter 在前servlet在后吧