拦截器碰到的坑记录

 1、@WebFilter

@WebFilter(filterName = "TestAFilter", urlPatterns = "/v1/testA/*")
@Order(1)
public class TestAFilter extends OncePerRequestFilter{
    @Autowired
    private MyService myService;
 
    @Override
    protected void doFilterInternal(...){...}
}
 
@WebFilter(filterName = "TestBFilter", urlPatterns = "/v1/testB/*")
@Order(2)
public class TestBFilter extends OncePerRequestFilter{
     @Autowired
    private MyService myService;
 
    @Override
    protected void doFilterInternal(...){...}
}

@ServletComponentScan(basePackages = {"**.*"})
@EnableScheduling
@EnableAsync
public class MyApplication {...}

好处：无需在Filter上增加@Component，Aserver也能注入，因为@WebFilter会交给Spring管理

坏处1：@Order有时候不生效，参考：关于@webFilter使用@Order无效问题 - oKong_趔趄的猿 - 博客园

坏处2：不小心在Fiter上加了@Component会导致urlPatterns失效，拦截所有的接口

2、FilterRegistrationBean

① Config

@Configuration
public class InstFilterConfig {
 
    @Autowired
    private MyService myService;
 
    @Bean
    public FilterRegistrationBean testAFilter() {
        FilterRegistrationBean bean = new FilterRegistrationBean<>();
        bean.setFilter(new TestAFilter(myService));
        bean.setName("TestAFilter");
        bean.addUrlPatterns("/v1/testA/*");
        bean.setOrder(1);
        return bean;
    }
 
    @Bean
    public FilterRegistrationBean testBFilter() {
        FilterRegistrationBean bean = new FilterRegistrationBean<>();
        bean.setFilter(new TestBFilter(myService));
        bean.setName("TestBFilter");
        bean.addUrlPatterns("/v1/testB/*");
        bean.setOrder(2);
        return bean;
    }
 
}

② FilterA

public class TestAFilter extends OncePerRequestFilter{
    private MyService myService;
    public TestAFilter(MyService myService){
        this.myService= myService;
    }
 
    @Override
    protected void doFilterInternal(...){...}
}

② FilterB

public class TestBFilter extends OncePerRequestFilter{
    private MyService myService;
    public TestBFilter(MyService myService){
        this.myService= myService;
    }
 
    @Override
    protected void doFilterInternal(...){...}
}

好处大大的！

另外：对于拦截器全局异常无法捕获可以按照如下方法解决：spring boot 项目在自定义Filter中抛出异常捕获不到的处理方法_Rum chen的博客-CSDN博客

最后：拦截器拦截请求作为全局变量参考：

Springboot中的拦截器获取请求头的数据_无情的搬砖机器的博客-CSDN博客_springboot 拦截器获取请求头