springboot配置跨域过滤器

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本文介绍如何在SpringBoot项目中配置过滤器并实现跨域访问。通过创建过滤器类并实现javax.servlet.Filter接口，再添加注解@Component，即可完成过滤器的基本设置。为实现跨域功能，在doFilter方法中设置了响应头，允许所有源访问、指定请求方法及缓存时间等。

1、springboot配置过滤器

首先创建过滤器类，实现javax.servlet.Filter，并添加注解@Component，即可

	package com.center.manager.filter;

	import java.io.IOException;
	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 javax.servlet.http.HttpServletResponse;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.springframework.stereotype.Component;

	@Component
	public class AccessFilter implements Filter {
	
		@Override
		public void destroy() {

		}

		@Override
		public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException { 

		}

		@Override
		public void init(FilterConfig arg0) throws ServletException {

		}

	}

2、使用过滤器实现跨域访问

在doFilter方法中添加如下代码

	package com.center.manager.filter;

	import java.io.IOException;
	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 javax.servlet.http.HttpServletResponse;
	import javax.servlet.http.HttpServletRequest;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.springframework.stereotype.Component;

	@Component
	public class AccessFilter implements Filter {
	
		@Override
		public void destroy() {

		}

		@Override
		public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException { 
			
			HttpServletRequest request = (HttpServletRequest) req;
	        HttpServletResponse response = (HttpServletResponse) res;  
	        
			response.setHeader("Access-Control-Allow-Origin", "*");  
	        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");  
	        response.setHeader("Access-Control-Max-Age", "3600");  
	        response.setHeader("Access-Control-Allow-Headers", "*");   

	        chain.doFilter(req, res);  

		}

		@Override
		public void init(FilterConfig arg0) throws ServletException {

		}

	}