無法在Java Servlet中設置Content-Type / MIME-type

Question

我正在使用以下過濾器，顯式設置對application / json的響應的內容類型：

@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);
}

但是，它不起作用，並且在瀏覽器中請求時，內容類型為text / html。 其他頭工作正常。

Answer 1

我意識到這很舊。 我遇到了這個問題，我的解決方法是：

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

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