无法在java servlet中设置Content-Type / MIME-type

Question

我使用以下过滤器，显式地将响应的content-type设置为application/json：

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    HttpServletResponse response = (HttpServletResponse) servletResponse;
    response.setHeader("Access-Control-Allow-Origin", "*");
    response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE");
    response.setHeader("Access-Control-Max-Age", "3600");
    response.setContentType("application/json");
    response.setCharacterEncoding("utf-8");
    response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    filterChain.doFilter(servletRequest, servletResponse);
}

然而，它不起作用，当在浏览器中请求时，content-type是text/html。其他标头工作正常。

Answer 1

我知道这很老了。我遇到过这个问题，我的解决方法是：

    resp.setHeader("Content-Disposition","attachment; filename="+fname);

请参阅：http://archive.oreilly.com/pub/a/onjava/excerpt/jebp_3/index3.html