一、SimpleCORSFilter工具类
在项目Util类中新建类SimpleCORSFilter 实现Filter接口

package com.how2java.tmall.util;

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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class SimpleCORSFilter implements Filter{
    private boolean isCross = false;

    @Override
    public void destroy() {
        isCross = false;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        if (isCross) {
            HttpServletRequest httpServletRequest = (HttpServletRequest) request;
            HttpServletResponse httpServletResponse = (HttpServletResponse) response;
            System.out.println("拦截请求: " + httpServletRequest.getServletPath());
            httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
            httpServletResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
            httpServletResponse.setHeader("Access-Control-Max-Age", "0");
            httpServletResponse.setHeader("Access-Control-Allow-Headers",
                    "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");
            httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");
            httpServletResponse.setHeader("XDomainRequestAllowed", "1");
        }
        chain.doFilter(request, response);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        String isCrossStr = filterConfig.getInitParameter("IsCross");
        isCross = isCrossStr.equals("true") ? true : false;
        System.out.println(isCrossStr);
    }

}

二、web.xml处理跨域请求

  <filter>  
    <filter-name>SimpleCORSFilter</filter-name>  
    <filter-class>com.how2java.tmall.util.SimpleCORSFilter</filter-class>  
    <init-param>  
      <param-name>IsCross</param-name>  
      <param-value>true</param-value>  
    </init-param>  
  </filter>  
  <filter-mapping>  
    <filter-name>SimpleCORSFilter</filter-name>  
    <url-pattern>/*</url-pattern> 
  </filter-mapping>  

三、spring-4.0的
springMVC.xml配置
暂时没用过4.+，只知道翻解决办法有这个东西，先记下来

<mvc:cors>  
        <mvc:mapping path="/**"  
                       allowed-origins="*"  
                       allowed-methods="POST, GET, OPTIONS, DELETE, PUT"  
                       allowed-headers="Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With"  
                       allow-credentials="true" />  
    </mvc:cors>