创建springboot过滤器

最新推荐文章于 2025-04-12 10:36:17 发布

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本文介绍了一个自定义的SpringBoot过滤器实现，该过滤器继承了`OncePerRequestFilter`类，并利用Spring容器注入了`MyRestTemplate`和`jxJson`等组件，通过配置使其在所有请求路径上生效。

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springboot过滤器

import org.springframework.core.ParameterizedTypeReference;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;

public class BmXyCnsFilter extends OncePerRequestFilter {

    MyRestTemplate restTemplate;
    List list;

    @Override
    protected void initFilterBean() throws ServletException {
        ServletContext servletContext = getServletContext();
        WebApplicationContext webApplicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
        restTemplate= webApplicationContext.getBean(MyRestTemplate.class);
        //从spring容器中获取到jxJson bean对象
        //可查看上一个博客，路径：https://blog.youkuaiyun.com/Denial_learn/article/details/122415367?spm=1001.2014.3001.5501
        list=(List) webApplicationContext.getBean("jxJson");
    }
    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        HttpSession session = httpServletRequest.getSession();
        Visit visit = (Visit) session.getAttribute("SESSION_VISIT_______");
        String requestURI = httpServletRequest.getRequestURI();
        String substring = requestURI.substring(requestURI.indexOf("/"), requestURI.length());
        //业务逻辑
        {业务逻辑}
        filterChain.doFilter(httpServletRequest,httpServletResponse);


    }



}

使过滤器生效

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 getBmXyFilter(){
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new BmXyCnsFilter());
        registrationBean.addUrlPatterns("/*");
        registrationBean.setName("bmxyFilter");
        registrationBean.setOrder(2);
        return registrationBean;
    }

}