在 Java EE 中将 http 重定向到 https

   <filter-name>HttpToHttpsFilter</filter-name>
   <filter-class>com.example.HttpToHttpsFilter</filter-class>
</filter><filter-mapping>
   <filter-name>HttpToHttpsFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebFilter(urlPatterns = "/*")
public class HttpToHttpsFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;

        if (!httpRequest.isSecure()) {
            String redirectUrl = "https://" + httpRequest.getServerName() + httpRequest.getRequestURI();
            httpResponse.sendRedirect(redirectUrl);
        } else {
            chain.doFilter(request, response);
        }
    }

    @Override
    public void destroy() {
    }
}