SpringBoot中如何配置使用过滤器(Filter)呢?

实现思路:
    1.定义filter
	2.将filter注册进springBoot的容器中即可

定义实现Filter接口

package com.java265.filter;
 
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class MySelfFilter implements Filter {
 
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
 
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest  request = (HttpServletRequest)servletRequest;
        HttpServletResponse response  = (HttpServletResponse) servletResponse;
        response.addHeader("Access-Control-Allow-Origin","http://localhost:7001");// * 允许所有域名跨域访问
        response.addHeader("Access-Control-Allow-Methods","GET");// * 允许所有请求方法
        // 是否让请求通过过滤器。这行代码不能漏掉。如果漏掉请求会访问不到URL
        filterChain.doFilter(request,response);
    }
 
    @Override
    public void destroy() {
 
    }
}

注册Filter到springboot中

package com.java265;
 
import com.java265.filter.MySelfFilter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ImportResource;
 
@SpringBootApplication
@ImportResource({ "classpath:applicationContext.xml" })
public class StudySpringBootApplication {
 
	public static void main(String[] args) throws  Exception {
		SpringApplication.run(StudySpringBootApplication.class, args);
	}
 
	@Bean
	public FilterRegistrationBean registFilter(){
		FilterRegistrationBean bean = new FilterRegistrationBean();
		// 定义filter的过滤路径规则。
		bean.addUrlPatterns("/*");
		bean.setFilter(new MySelfFilter());
        return bean;
	}
}