使用spring-session-data-redis管理session，过滤静态文件

使用spring-session-data-redis管理session，过滤静态文件

在分布式系统中，如果想要集中存储会话状态，一般会用到redis来存储会话，但是使用spring-session-data-redis时，会把所有请求都去访问redis，包括静态资源文件，解决方法是加一个过滤器判断，从而绕过session filter

如：所有以/static/开头的url，都绕过session filter，从而不去访问session

import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.annotation.Order;
import org.springframework.session.web.http.SessionRepositoryFilter;
import org.springframework.stereotype.Component;
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;

@Component
@Order(SessionRepositoryFilter.DEFAULT_ORDER - 1)
public class ExcludeUrlFilter extends oncePerRequestFilter {

    
    @Value("${spring.session.exclude.url}")
    private String url;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        boolean flag = excludeUrl(request.getRequestURI(), url);
        if(flag) {
            request.setAttribute("org.springframework.session.web.http.SessionRepositoryFilter.FILTERED", Boolean.TRUE);
        }
        filterChain.doFilter(request, response);
    }

    private boolean excludeUrl(String requestURI, String url) {
        String[] uri = url.split(",");
        for(String str:uri){
            if(requestURI.startsWith(str)){
                return true;
            }
        }
        return false;
    }

}

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