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SpringMvc+Shiro有时候shiro取不到用户名

public class MyFilter implements Filter {
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        request.setCharacterEncoding("UTF-8");
        String username = request.getParameter("username");


        KqZhxxFileUtils.writeUserNameEmptyFile("filter里的userName---->"+username);
        System.out.println("过滤器里的username---->"+username);
        chain.doFilter(request, response);
    }

    public void destroy() {

    }
}
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