Spring Security  整体架构操作流程

package authorization.filter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Collections;
public class JwtAuthenticationFilter extends OncePerRequestFilter {
	private final Logger logger = LoggerFactory.getLogger(JwtAuthenticationFilter.class);
	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
			throws ServletException, IOException {
		String token = request.getHeader("token");
		if (!StringUtils.hasText(token)) {
			filterChain.doFilter(request, response);
			return;
		}
		try {
			UsernamePasswordAuthenticationToken authenticationToken
					= UsernamePasswordAuthenticationToken.authenticated("zhangsan", "zs", Collections.emptyList());
			SecurityContext context = SecurityContextHolder.createEmptyContext();
			context.setAuthentication(authenticationToken);
			SecurityContextHolder.setContext(context);
			filterChain.doFilter(request, response);
		}
		finally {
			SecurityContextHolder.clearContext();
		}
	}
	@Override
	protected boolean shouldNotFilterErrorDispatch() {
		return true;
	}
}