vue中axios访问Java后端跨域问题解决

问题背景:  前后端分离,前端选用Vue,后端选用Java,vue编译出的静态页面采用ngix发布,在前端访问后端时出现跨域问题。解决方法:  跨域的问题解决方法有好多种,这里是通过服务端解决,以下是代码实现。

 public class AllowOriginFilter implements Filter {
 
     @SuppressWarnings("unused")
     public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
 
         HttpServletResponse response = (HttpServletResponse) res;
         HttpServletRequest request=(HttpServletRequest)req;
         response.setHeader("Access-Control-Allow-Origin", "*"); // 设置允许所有跨域访问 
         response.setHeader("Access-Control-Allow-Methods", "POST,GET,PUT,OPTIONS,DELETE");
         response.setHeader("Access-Control-Max-Age", "3600");
         response.setHeader("Access-Control-Allow-Headers", "Origin,X-Requested-With,Content-Type,Accept,Authorization,token");
         response.setHeader("Access-Control-Allow-Credentials", "true");
         chain.doFilter(req,res);
     }
 
     public void init(FilterConfig filterConfig) {}
 
     public void destroy() {}
 
 
 }

导致跨域问题的情况:
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|URL地址|解释说明|是否允许通信|
|----|----|----|
|http://www.a.com/a.js http://www.a.com/b.js|同一域名|允许|
|http://www.a.com/a/a.js http://www.a.com/b/b.js|同一域名,不同文件夹|允许|
|http://www.a.com/a.js http://www.a.com:8080/b.js|同一域名,不同端口|不允许|
|http://www.a.com/a.js https://www.a.com/b.js|同一域名,不同协议; 一个是http,另一个是https |不允许|
|http://www.a.com/a.js https://www.10.0.1.100.com/b.js|一个域名,一个域名对应的IP|不允许|
|http://www.a.com/a.js https://www.sub.a.com/b.js|同一主域名,二级域名不同|不允许|
|http://www.a.com/a.js http://www.b.com/b.js|两个不同的域名 |不允许|
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