前端请求跨域问题

使用微信接口时，遇到前端请求跨域问题，不用修改tomcat  conf，配置过滤器即可。

过滤器

package me.ele.mercuris.svr.web.framework;



import com.google.gson.Gson;

//import me.ele.mercuris.coffee.dto.KarmaUser;

import me.ele.mercuris.common.exception.SystemException;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;



import javax.servlet.*;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;



public class WebAPISecurityFilter implements Filter {

	final static Logger logger = LoggerFactory.getLogger(WebAPISecurityFilter.class);



	private WebAPISecurityProtocol securityProtocol = new WebAPISecurityProtocol();



	@Override

	public void init(FilterConfig filterConfig) throws ServletException {



	}



	@Override

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,

			ServletException {

		HttpServletRequest httpRequest = (HttpServletRequest) request;

		HttpServletResponse httpResponse = (HttpServletResponse) response;

		corsResponse(httpResponse);



		chain.doFilter(request, response);

	}



		/**

	 * Cross-origin resource sharing (CORS)

	 *

	 * @param response

	 */

	private void corsResponse(HttpServletResponse response) {

		response.setHeader("Access-Control-Allow-Origin", "*");

		response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");

		response.setHeader("Access-Control-Max-Age", "3600");

		response.setHeader("Access-Control-Allow-Headers", WebAPISecurityProtocol.CUSTOM_HEADERS);

	}



	@Override

	public void destroy() {

	}



}

context-svr.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!-- 这是一个基础的Filter但依赖于基础认证 -->
   <bean id="webapi_security" class="me.ele.mercuris.svr.web.framework.WebAPISecurityFilter">
    </bean>
   

</beans>

在web.xml中添加

 <filter>
        <filter-name>webapi_security</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
        <init-param>
            <param-name>targetFilterLifecycle</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>webapi_security</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>