一個支持跨域訪問的web filter

package com.souche.evaluate.dforce.filter;
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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author lg
 * @description
 * @create 2019-08-15
 **/
public class DforceCrossDomainFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        String origin = request.getHeader("Origin");
        if (origin == null) {
            response.setHeader("Access-Control-Allow-Origin", "*");
        } else {
            response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
        }
        //保持ajax跨域cookie
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, souche-security-token-inc, Souche-Security-Token");
        chain.doFilter(req, res);
    }

    @Override
    public void destroy() {

    }
}