package com.cloudtech.web.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author wude
 * @version 1.0.0
 * @description
 * @date 2018-08-17 14:38
 */
public class SimpleCORSFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse httpServletResponse = (HttpServletResponse) servletResponse;
        httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
        httpServletResponse.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
        httpServletResponse.addHeader("Access-Control-Allow-Headers", "Content-Type");
        httpServletResponse.addHeader("Access-Control-Max-Age", "1800");//30 min
        filterChain.doFilter(servletRequest, httpServletResponse);
    }

    @Override
    public void destroy() {

    }

}

web.xml

	<!-- cors解决跨域访问问题 -->
	<filter>
		<filter-name>cors</filter-name>
		<filter-class>com.cloudtech.web.filter.SimpleCORSFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>cors</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>