如何在 Spring Boot 应用程序中注册 JavaEE 过滤器？

Posted 2023-02-26

【中文标题】如何在 Spring Boot 应用程序中注册 JavaEE 过滤器？

【英文标题】：How to register a JavaEE filter in your Spring Boot application?

【发布时间】：2017-07-12 23:47:25

【问题描述】：

我在基于Spring Boot 的REST 应用程序中有以下Spring Boot 控制器和JavaEE 过滤器类。请注意，我没有在此处配置web.xml。

http://localhost:8080/api/products -> Returns 200

问题是拦截器/过滤器永远不会被调用。

ProductController.java

@RestController
@RequestMapping("/api")
public class ProductController 

    @Inject
    private ProductService productService;

    //URI: http://localhost:8080/api/products
    @RequestMapping(value = "/products", method = RequestMethod.GET)
    public ResponseEntity<Iterable<Product>> getAllProducts() 
        Iterable<Product> products = productService.getAllProducts();
        return new ResponseEntity<>(products, HttpStatus.OK);
    

    //URI: http://localhost:8080/api/products/50
    @RequestMapping(value = "/products/productId", method = RequestMethod.GET)
    public ResponseEntity<?> getProduct(@PathVariable Long productId) 
        Product product = productService.getProduct(productId);
        return new ResponseEntity<>(product, HttpStatus.OK);
    

SecurityFilter.java

@WebFilter(urlPatterns = "/api/products/*")
public class SecurityFilter implements Filter 

    @Override
    public void init(FilterConfig filterConfig) throws ServletException 
        //in the init method
    

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException 
        //THIS METHOD NEVER GETS CALLED AND HENCE THIS NEVER GETS PRINTED ON CONSOLE. 
        //WHY ?????
        System.out.println("**********Into the doFilter() method...........");
        final HttpServletRequest httpRequest = (HttpServletRequest) request;
        final HttpServletResponse httpResponse = (HttpServletResponse) response;
        //move ahead
        chain.doFilter(httpRequest, httpResponse);
    

    @Override
    public void destroy() 
        //nothing to implement
    

BasicRestApplication.java

@SpringBootApplication
public class BasicRestApplication 

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

我已经浏览了此链接How to add a filter class in Spring Boot?，但它并没有明确说明需要添加什么以在Spring Boot 注册过滤器的位置。

【参考方案1】：

从这里找到解决方案Add a Servlet Filter in a Spring Boot application

创建了一个新的配置类并注册了过滤器类。

@Configuration
public class ApplicationConfig 

    @Bean
    public Filter securityFilter() 
        return new SecurityFilter();