拦截器实现跨域

在web.xml 中的配置

        <filter>
            <filter-name>crossorigin</filter-name>
            <filter-class>com.utils.CORSFilter</filter-class>
        </filter>
        <filter-mapping>
            <filter-name>crossorigin</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>

在com.utils下以下

/**
 * 
 */
package com.utils;

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;

/**
 * @author jomin
 *
 */
public class CORSFilter implements Filter {


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

    }


    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        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", "x-requested-with");
        filterChain.doFilter(servletRequest, servletResponse);

    }


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

    }

}

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转自：https://blog.csdn.net/zpf0918/article/details/52624813