package cn.springmvc.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.springframework.stereotype.Component;

@Component
public class CosDomainFilter implements Filter{

	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	// 跨域请求添加返回体
	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
		HttpServletResponse response = (HttpServletResponse) res;
	    response.setHeader("Access-Control-Allow-Origin", "*");
	    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PATCH");
	    response.setHeader("Access-Control-Max-Age", "3600");
	    response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
	    chain.doFilter(req, res);
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}

}

package cn.springmvc.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.springframework.stereotype.Component;

@Component
public class CosDomainFilter implements Filter{

	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	// 跨域请求添加返回体
	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
		HttpServletResponse response = (HttpServletResponse) res;
	    response.setHeader("Access-Control-Allow-Origin", "*");
	    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PATCH");
	    response.setHeader("Access-Control-Max-Age", "3600");
	    response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
	    chain.doFilter(req, res);
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}

}

add response header