过滤器放行swagger

在开发Web应用时，通常会使用过滤器（Filter）来进行一些全局的请求处理，例如身份验证、授权、日志记录等。然而，有时候我们希望某些特定的请求能够绕过这些过滤器，例如Swagger文档的请求。以下是如何在Spring Boot应用中配置过滤器以放行Swagger请求的步骤：

1. **创建过滤器**：首先，创建一个自定义过滤器类，并实现`javax.servlet.Filter`接口。

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class MyFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // 初始化过滤器
    }

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

        String uri = httpRequest.getRequestURI();

        // 放行Swagger相关请求
        if (uri.startsWith("/swagger") || uri.startsWith("/v2/api-docs")) {
            chain.doFilter(request, response);
            return;
        }

        // 其他请求的处理逻辑
        // ...
    }

    @Override
    public void destroy() {
        // 销毁过滤器
    }
}

2. **注册过滤器**：在Spring Boot应用中注册这个过滤器。可以通过Java配置类来完成。

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FilterConfig {

    @Bean
    public FilterRegistrationBean<MyFilter> myFilterRegistration() {
        FilterRegistrationBean<MyFilter> registration = new FilterRegistrationBean<>();
        registration.setFilter(new MyFilter());
        registration.addUrlPatterns("/*");
        registration.setName("myFilter");
        registration.setOrder(1);
        return registration;
    }
}

3. **配置Swagger**：确保Swagger的配置正确，并且其请求路径与过滤器中的放行路径一致。

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@Configuration
@EnableSwagger2
public class SwaggerConfig {
    @Bean
    public Docket api() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.example.demo"))
                .paths(PathSelectors.any())
                .build();
    }
}

通过上述配置，所有以`/swagger`和`/v2/api-docs`开头的请求都会被过滤器放行，从而确保Swagger文档能够正常访问。