在spring boot中使用@WebFilter配置filter（包括排除URL）

@WebFilter(urlPatterns = "/*")
@Order(value = 1)
public class TestFilter implements Filter {

    private static final Set<String> ALLOWED_PATHS = Collections.unmodifiableSet(new HashSet<>(
            Arrays.asList("/main/excludefilter", "/login", "/logout", "/register")));
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("init-----------filter");
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        String path = request.getRequestURI().substring(request.getContextPath().length()).replaceAll("[/]+$", "");
        boolean allowedPath = ALLOWED_PATHS.contains(path);

        if (allowedPath) {
            System.out.println("這裡是不需要處理的url進入的方法");
            chain.doFilter(req, res);
        }
        else {
            System.out.println("這裡是需要處理的url進入的方法");
        }
    }

    @Override
    public void destroy() {
        System.out.println("destroy----------filter");
    }
}
           

@Order中的value越小，優先級越高。

ALLOWED_PATHS      

這個是一個集合，存放的是需要排出的URL，用來判斷是否是需要排除的URL。

關于為什麼SpringBoot中使用了@WebFilter但是過濾器卻沒有生效：一定要加上@Configuration注解，@Service其實也可以，其他類似。