spring boot 过滤请求并发送到controller_webfilter 重定向到controller-优快云博客

本文链接：https://blog.youkuaiyun.com/carl_jiang/article/details/77069565

本文介绍了如何在Spring Boot中创建一个Filter来过滤请求，并将其注册到应用程序，以便在没有传统配置文件的情况下处理过滤逻辑。

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spring boot 没有了配置文件，可以写一个Filter 来完成过滤。

1.写Filter:

public class CustomFilter implements Filter {

    /**
     * 封装，不需要过滤的list列表
     */
    protected static List<Pattern> patterns = new ArrayList<Pattern>();

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

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest)servletRequest;
        HttpServletResponse httpResponse = (HttpServletResponse)servletResponse;
        String url = httpRequest.getRequestURI().substring(httpRequest.getContextPath().length()); //请求的url
        filterChain.doFilter(httpRequest, httpResponse); // 发到controller方法时候，参数居然是有的。

    }

    /**
     * 是否需要过滤
     * @param url
     * @return
     */
    private boolean isInclude(String url) {
        for (Pattern pattern : patterns) {
            Matcher matcher = pattern.matcher(url);
            if (matcher.matches()) {
                return true;
            }
        }
        return false;
    }
    @Override
    public void destroy() {

    }

}

2. 注册过滤器：在application.java下面注册过滤器

@SpringBootApplication
public class SieracApiApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(SieracApiApplication.class, args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(SieracApiApplication.class);
    }


    /**
     * 注册过滤器
     * @return
     */
    @Bean
    public FilterRegistrationBean filterRegistrationBean() {

        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new CustomFilter());
        List<String> urlPatterns = new ArrayList<String>();

        urlPatterns.add("/api/dealer/out/list"); //这个请求会走filter。 比如是/api/product/out/list就不会走filter
        urlPatterns.add("/api/dealer/out/scanCheck");
        urlPatterns.add("/api/dealer/out/detail");
        urlPatterns.add("/api/dealer/out/scanStatus");


        registrationBean.setUrlPatterns(urlPatterns);
        return registrationBean;

    }
}

以上就能过滤你的url请求，并且发送到控制层。