Spring Boot - filter 的顺序

本是古典何须时尚 2024-02-18 12:07 32阅读 0赞

## 定义过滤器的执行顺序 ##

## 1、第一个过滤器 ##

import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import java.io.IOException;
    
    public class MyFirstFilter implements Filter {
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
            // 初始化逻辑
        }
    
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                throws IOException, ServletException {
            System.out.println("执行 MyFirstFilter...");
    
            // 继续执行过滤器链
            chain.doFilter(request, response);
        }
    
        @Override
        public void destroy() {
            // 清理逻辑
        }
    }

## 第二个过滤器 ##

import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import java.io.IOException;
    
    public class MySecondFilter implements Filter {
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
            // 初始化逻辑，如果需要的话
        }
    
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                throws IOException, ServletException {
            // 你的自定义过滤器逻辑在这里
            System.out.println("执行 MySecondFilter...");
    
            // 继续执行过滤器链
            chain.doFilter(request, response);
        }
    
        @Override
        public void destroy() {
            // 清理逻辑，如果需要的话
        }
    }

## 定义过滤器的执行顺序的配置 ##

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<MyFirstFilter> myFirstFilter() {
            FilterRegistrationBean<MyFirstFilter> registrationBean = new FilterRegistrationBean<>();
            registrationBean.setFilter(new MyFirstFilter());
            registrationBean.addUrlPatterns("/*");
            registrationBean.setOrder(1);
            return registrationBean;
        }
    
        @Bean
        public FilterRegistrationBean<MySecondFilter> mySecondFilter() {
            FilterRegistrationBean<MySecondFilter> registrationBean = new FilterRegistrationBean<>();
            registrationBean.setFilter(new MySecondFilter());
            registrationBean.addUrlPatterns("/*");
            registrationBean.setOrder(2);
            return registrationBean;
        }
    }

## 定义controller ##

import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class HelloController {
    
        @RequestMapping("/hello")
        public String hello() {
            return "hello filter!";
        }
    }

正常访问：http://localhost:8080/hello  
![在这里插入图片描述][1d4a752a118e400dbe8ba39bb5e0f8d3.png]  
不正常访问：http://localhost:8080/HELLO  
![在这里插入图片描述][05c4bab1ffa7448499040fe0bff91f79.png]  
![在这里插入图片描述][e74d236ef3fb440ebd30da4a68c071ed.png]  
可看到路径mapping是区分大小写的，如果路径不正确，虽然404，但过滤器链依然会执行（/\*全局情况下）。

[1d4a752a118e400dbe8ba39bb5e0f8d3.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/ddfbb4e3173b4e5f8df9e05f62586257.png
[05c4bab1ffa7448499040fe0bff91f79.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/1b8c42968e374e669f16c7278092a6e6.png
[e74d236ef3fb440ebd30da4a68c071ed.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/eef8fcf6d63e4b829d57342900631d1c.png