使用Spring注册过滤器大约有四种不同的选项。

首先，我们可以创建一个实现Filter或扩展HttpFilter的Spring bean:

@Component
public class MyFilter extends HttpFilter {

    @Override
    protected void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) 
        throws IOException, ServletException {
        // Implementation details...

        chain.doFilter(request, response);
    }
}

其次，我们可以创建一个扩展GenericFilterBean的Spring bean:

@Component
public class MyFilter extends GenericFilterBean {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)
  throws IOException, ServletException {
    //Implementation details...

        chain.doFilter(currentRequest, servletResponse);
    }
}

我们也可以使用FilterRegistrationBean类:

@Configuration
public class FilterConfiguration {

    private final MyFilter myFilter;

    @Autowired
    public FilterConfiguration(MyFilter myFilter) {
        this.myFilter = myFilter;
    }

    @Bean
    public FilterRegistrationBean<MyFilter> myFilterRegistration() {
        FilterRegistrationBean<DateLoggingFilter> filterRegistrationBean = new FilterRegistrationBean<>();
        filterRegistrationBean.setFilter(myFilter);
        filterRegistrationBean.setUrlPatterns(Collections.singletonList("/*"));
        filterRegistrationBean.setDispatcherTypes(DispatcherType.REQUEST);
        filterRegistrationBean.setOrder(Ordered.LOWEST_PRECEDENCE - 1);
        return filterRegistrationBean;
    }
}

最后，我们可以使用@ServletComponentScan的@WebFilter注释:

@WebFilter(urlPatterns = "/*", dispatcherTypes = {DispatcherType.REQUEST})
public class MyFilter extends HttpFilter {

    @Override
    protected void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
  throws IOException, ServletException {
        // Implementation details...

        chain.doFilter(request, response);
    }
}

我在这里看到了很多答案，但我没有尝试任何一个。我刚刚创建了如下代码所示的过滤器。

import org.springframework.context.annotation.Configuration;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

@WebFilter(urlPatterns = "/Admin")
@Configuration
public class AdminFilter implements Filter{
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse  servletResponse, FilterChain filterChain) throws IOException, ServletException      {
    System.out.println("happened");

    }

    @Override
    public void destroy() {

    }
}

我让剩下的Spring Boot应用程序保持原样。

你主要需要两样东西:

Add @ServletComponentScan to your Main Class You may add a package named filter inside it. You create a Filter class that has the following: @Component @Order(Ordered.HIGHEST_PRECEDENCE) public class RequestFilter implements Filter { // whatever field you have public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) { HttpServletResponse response = (HttpServletResponse) res; HttpServletRequest request = (HttpServletRequest) req; // Whatever implementation you want try { chain.doFilter(req, res); } catch(Exception e) { e.printStackTrace(); } } public void init(FilterConfig filterConfig) { } public void destroy() { } }

首先，将@ServletComponentScan添加到SpringBootApplication类中。

@ServletComponentScan
public class Application {

其次，创建一个过滤器文件，扩展filter或第三方过滤器类，并像这样添加@WebFilter到这个文件:

@Order(1) //optional
@WebFilter(filterName = "XXXFilter", urlPatterns = "/*",
    dispatcherTypes = {DispatcherType.REQUEST, DispatcherType.FORWARD},
    initParams = {@WebInitParam(name = "confPath", value = "classpath:/xxx.xml")})
public class XXXFilter extends Filter{

对于基于任何条件和spring引导中的任何列表的过滤，查询语言更加灵活，并允许我们向下过滤到我们需要的确切资源。 例如，如果我们有一个简单的实体，如User，并像这样定义它。

@Entity
public class User {
@Id
@GeneratedValue(strategy = 
GenerationType.AUTO)
private Long id;

private String firstName;
private String lastName;
private String email;

private int age;

//Setter and getter as usual

然后我们创建一个实现Specification接口的UserSpecification，我们将传递我们自己的约束来构造实际的查询。在本部分中，与标准和构建器相关的方法非常有用和灵活。

public class UserSpecification implements Specification<User> {

private SearchCriteria criteria;

@Override
public Predicate toPredicate
  (Root<User> root, CriteriaQuery<?> query, CriteriaBuilder builder) {

    if (criteria.getOperation().equalsIgnoreCase(">")) {
        return builder.greaterThanOrEqualTo(
          root.<String> get(criteria.getKey()), criteria.getValue().toString());
    } 
    else if (criteria.getOperation().equalsIgnoreCase("<")) {
        return builder.lessThanOrEqualTo(
          root.<String> get(criteria.getKey()), criteria.getValue().toString());
    } 
    else if (criteria.getOperation().equalsIgnoreCase(":")) {
        if (root.get(criteria.getKey()).getJavaType() == String.class) {
            return builder.like(
              root.<String>get(criteria.getKey()), "%" + criteria.getValue() + "%");
        } else {
            return builder.equal(root.get(criteria.getKey()), criteria.getValue());
        }
    }
    return null;
}
}

此外，我们还创建了一个基于以下SearchCriteria类中表示的一些简单约束的规范，任何条件都可以像这样创建:

public class SearchCriteria {
private String key;
private String operation;
private Object value;
 }

最后定义UserRepository和扩展JpaSpecificationExecutor，

public interface UserRepository 
extends JpaRepository<User, Long>, 
JpaSpecificationExecutor<User> {}

你也可以使用@WebFilter来创建一个过滤器。这样就行了。

@Configuration
public class AppInConfig
{
    @Bean
    @Order(1)
    public FilterRegistrationBean aiFilterRegistration()
    {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new TrackingFilter());
        registration.addUrlPatterns("/**");
        registration.setOrder(1);
        return registration;
    }

    @Bean(name = "TrackingFilter")
    public Filter TrackingFilter()
    {
        return new TrackingFilter();
    }
}