CORS跨域问题

1、参考文档：

https://www.jianshu.com/p/1ad4358beff7?utm_campaign=maleskine&utm_content=note&utm_medium=seo_notes&utm_source=recommendation

2、代码实例

package com.wangymd.cors;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

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;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyCorsFilter implements Filter {

    private final static Logger LOGGER = LoggerFactory.getLogger(TalentTagCorsFilter.class);

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
//设置跨域请求
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;

        String origin = httpServletRequest.getHeader("Origin");
        //来源头是啥就设置啥，相当于不设置过滤
        httpServletResponse.setHeader("Access-Control-Allow-Origin", origin);
        LOGGER.error("CrossDomainFilter origin:{}", origin);
        //表示的是跨域的ajax中可以携带cookie，此时第一项设置不能为*，需指定域名
        httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE,OPTIONS");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", "Authorization,Content-Type,Accept,Origin,User-Agent,DNT,Cache-Control,X-Mx-ReqToken,Keep-Alive,X-Requested-With,If-Modified-Since");
        //表示在3600秒内，不需要再发送预检验请求，可以缓存该结果
        httpServletResponse.setHeader("Access-Control-Max-Age", "3600");

        //解决预检请求pre-flight的跨域 204表示是否成功，不返回内容
        if ("OPTIONS".equals(httpServletRequest.getMethod())) {
            httpServletResponse.setStatus(org.apache.http.HttpStatus.SC_OK);
            return;
        }
        LOGGER.error("getParameterMap:{}", request.getParameterMap());
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {

    }

}

过滤器配置：

    <!-- 跨域配置 -->    
    <filter>
        <filter-name>crossFilter</filter-name>
        <filter-class>com.wangymd.cors.MyCorsFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>crossFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

项目中使用WebMvcConfigurerAdapter未生效，所以采用javax.servlet.Filter方式。

WebMvcConfigurerAdapter未生效问题，待处理。。。