CharacterEncodingFilter的坑

不少时候，咱们觉得配置了CharacterEncodingFilter就能解决乱码问题，实际上不是的，

咱们能够观察其doFilterInternal方法

protected void doFilterInternal(
			HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
			throws ServletException, IOException {

		if (this.encoding != null && (this.forceEncoding || request.getCharacterEncoding() == null)) {
			request.setCharacterEncoding(this.encoding);
			if (this.forceEncoding) {
                //这里只设置了编码字符
				response.setCharacterEncoding(this.encoding);
			}
		}
		filterChain.doFilter(request, response);
	}

响应的话还须要设置内容类型,好比：

response.setContentType(MediaType.TEXT_HTML);