12.springboot中使用自定义Filter

项目结构

1.创建 Filter 对象

package com.it.web;
 
import javax.servlet.*;
import java.io.IOException;
//自定义过滤器
public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest,
                         ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException, ServletException {
 
        System.out.println("执行了MyFilter,doFilter");
        filterChain.doFilter(servletRequest,servletResponse);
 
    }
}

2.注册 Filter

package com.it.config;
 
import com.it.web.MyFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class WebApplicationConfig {
 
    @Bean
    public FilterRegistrationBean filterRegistrationBean(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new MyFilter());
        bean.addUrlPatterns("/user/*");
        return bean;
    }
 
}

3.创建 Controller

package com.it.controller;
 
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
public class CustomerFilterController {
 
    @RequestMapping("/user/account")
    @ResponseBody
    public String userAccount(){
        return "user/account";
    }
 
 
    @RequestMapping("/query")
    @ResponseBody
    public  String queryAccount(){
        return "/query";
    }
 
}

4.启动应用， 在浏览器访问 user/account, /query 查看浏览器运行结果

访问/user/account的地址，可以正常访问，查看控制台，已经正常的进行了输出这句话，说明过滤器发挥了作用，过滤成功了。

 

 清空控制台访问/query地址，控制台没有输出，说明该地址没有进行过滤，不在过滤器的地址范围内。