1.首先因为服务器端会先发送一个option请求到后台  在后台返回一个post给页面 页面在处理post请求给接口 

2.先写一个过滤器, 我们自己定义一个过滤器

 

 

package com.adtime.dsp.web.controller;

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;

import org.springframework.stereotype.Component;

/**

* Created by kangb on 2016/5/10.

*/

public class myCORSFilter implements Filter {

@Override

public void init(FilterConfig filterConfig) throws ServletException {

}

@Override

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

HttpServletResponse response = (HttpServletResponse) servletResponse;

String origin = (String) servletRequest.getRemoteHost()+":"+servletRequest.getRemotePort();

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,Authorization");

response.setHeader("Access-Control-Allow-Credentials","true");

filterChain.doFilter(servletRequest, servletResponse);

}

@Override

public void destroy() {

}

}

 

 

 

3.在web.xml里面配置过滤器

 

<!-- options 403 -->

<filter>

<filter-name>cors</filter-name>

<filter-class>com.adtime.dsp.web.controller.myCORSFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>cors</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

 

 

4.过滤器会自动过滤options请求  然后就可以直接跨域访问接口了