response.setContentType()在Java过滤器中重置
我试图在过滤器中将压缩文件的内容类型设置为正确的mime类型,而不是application / gzip。这是我的一些代码:
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException{
final HttpServletRequest request = (HttpServletRequest) servletRequest;
final HttpServletResponse response = (HttpServletResponse) servletResponse;
String reqUrl = request.getRequestURI();
if (reqUrl.endsWith(gzExt))
{
response.setHeader("Content-Encoding", "gzip");
response.setContentType("text/javascript");
System.out.println("Set header " +reqUrl +", " + response.getContentType() );
filterChain.doFilter(request, response);
System.out.println("Header now: " + reqUrl + ", " + response.getContentType() );
return;
}
}
输出:
Set header /test.js.gz, text/javascriptHeader now: /test.js.gz, application/x-gzip
在浏览器中,我看到content-encoding
正确设置为gzip
,但content-
type仍为application/x-gzip
。似乎filterChain.doFilter()
正在重置内容类型。
知道如何永久重置内容类型吗?
我没有其他过滤器。
回答:
我借助以下答案解决了它:
private class ForcableContentTypeWrapper extends HttpServletResponseWrapper{
public ForcableContentTypeWrapper(HttpServletResponse response)
{
super(response);
}
@Override
public void setContentType(String type)
{
}
public void forceContentType(String type)
{
super.setContentType(type);
}
}
然后将我上面的代码更改为:
if (reqUrl.endsWith(gzExt)) {
ForcableContentTypeWrapper newResponse = new ForcableContentTypeWrapper(response);
newResponse.setHeader("Content-Encoding", "gzip");
newResponse.forceContentType("text/javascript");
filterChain.doFilter(request, newResponse);
return;
}
它不是一个很好的解决方法,但它可以工作。
以上是 response.setContentType()在Java过滤器中重置 的全部内容, 来源链接: utcz.com/qa/417750.html