关于跨域问题

问题：我们在部署项目的时候，经常是前后端分离，导致端口号不一致，出现跨域问题

解决办法：

第一.我这次是前后端放在同一服务器，但是端口号不一致.

主要问题就是跨域，然后我打断点发现能到后端，后来我就写了个拦截器，完美解决端口号不一致的跨域问题。代码如下：

import org.springframework.context.annotation.Configuration; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebFilter(filterName = "CORSConf") @Configuration public class CORSConf implements Filter { @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletResponse response = (HttpServletResponse) res; response.setHeader("Access-Control-Allow-Origin","*"); response.setHeader("Access-Control-Allow-Credentials", "true"); response.setHeader("Access-Control-Allow-Methods", "POST, GET, PATCH, DELETE, PUT"); response.setHeader("Access-Control-Max-Age", "3600"); response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept,token"); chain.doFilter(req, res); } }

第二.端口号不同，ip地址不同服务器不同

这时候要用到nignx解决的端口号和ip不同的问题

server { listen 80; server_name jiaren.8910.io:8910;//自己的端口号和ip地址 #charset koi8-r; #access_log logs/host.access.log main; location / { root html; index index.html index.htm; } location ^~/api/ {//这个是自己规定的api样式，就是向后端请求数据，遇到/api就执行下面代码 if ($request_method = 'OPTIONS') { add_header 'Access-Control-Allow-Origin' '*'; add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS'; add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type'; add_header 'Access-Control-Max-Age' 1728000; add_header 'Content-Type' 'text/plain charset=UTF-8'; add_header 'Content-Length' 0; return 204; } if ($request_method = 'POST') { add_header 'Access-Control-Allow-Origin' '*'; add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS'; add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type'; } if ($request_method = 'GET') { add_header 'Access-Control-Allow-Origin' '*'; add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS'; add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type'; } add_header 'Access-Control-Allow-Origin' '*'; add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS'; add_header 'Access-Control-Allow-Headers' 'Authorization,DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range'; #add_header 'Access-Control-Allow-Headers' '*'; add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range'; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; client_max_body_size 50m; client_body_buffer_size 25m; proxy_connect_timeout 15; proxy_send_timeout 20; proxy_read_timeout 20; proxy_buffer_size 4000k; proxy_buffers 4 30m; proxy_busy_buffers_size 70m; proxy_temp_file_write_size 70m; proxy_next_upstream error; proxy_pass http://jiaren.8910.io:8081/; #目标地址 } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # error_page 500 502 503 504 /50x.html; location = /50x.html { root html; }

以上俩种方法解决跨域问题。