无法设置内容类型/ MIME类型的Java Servlet

Question

我使用下面的筛选，明确设置内容类型为响应应用程序/ 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); 
} 

它不工作，但是，并且在浏览器中请求时的内容类型是text/html。其他头文件工作正常。

Answer 1

我意识到这是旧的。 我有这个问题，我的解决方法是：

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

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