Spring Boot with Filter

java spring springboot filter

@WebFilter

• its a java anno, not Spring one
• only work with embedded servlet container
• can not work with @Order, cause its not Spring Controlled
• need @ServletComponentScan with BootStrap Class
• not suggest

Use FilterRegistrationBean

• Its a Spring way
• Seperate Configuration Class
• each filter is a bean
• set Order(min---max), set Url Pattern
• suggest

Filter with Autowire

• can not use constructor autowire
• need to add one more init FilterBean in FilterRegistrationBean
• Filter no need annos

Code Piece

WebFilterConfiguration

@SpringBootConfiguration
public class WebFilterConfiguration {
  @Bean
  public FilterRegistrationBean<BasicAuthFilter> basicAuthFilterFilterRegistrationBean() {
    FilterRegistrationBean<BasicAuthFilter> filterFilterRegistrationBean =
      new FilterRegistrationBean<>();
    filterFilterRegistrationBean.setFilter(getBasicAuthFilter());
    filterFilterRegistrationBean.addUrlPatterns("/open/*");
    filterFilterRegistrationBean.setOrder(Ordered.LOWEST_PRECEDENCE - 1);
    return filterFilterRegistrationBean;
  }
  @Bean
  public BasicAuthFilter getBasicAuthFilter() {
    return new BasicAuthFilter();
  }
}

Filter

public class BasicAuthFilter implements Filter {
  @Autowired private PathMatcher pathMatcher;
  @Autowired private ResourceService resourceService;
  @Autowired private UrlPathHelper urlPathHelper;

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

  @Override
  public void doFilter(
  ......
}  

Cont.

• use proxy to create/fetch filter bean
• use custom anno to combine @WebFilter

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最后编辑时间为: Jul 7, 2023 at 04:09 am