解决 vue axios 带 header 时，会默认发起 OPTIONS 请求的方法的问题

common/common-framework/src/main/java/cn/iocoder/common/framework/servlet/CorsFilter.java

@@ -0,0 +1,35 @@
+package cn.iocoder.common.framework.servlet;
+
+import javax.servlet.*;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+public class CorsFilter implements Filter {
+
+    @Override
+    public void init(FilterConfig filterConfig) { }
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
+        HttpServletResponse resp = (HttpServletResponse) response;
+        resp.setHeader("Access-Control-Allow-Origin", "*");
+        resp.setHeader("Access-Control-Allow-Methods", "*");
+        resp.setHeader("Access-Control-Allow-Headers", "*");
+        resp.setHeader("Access-Control-Max-Age", "1800");
+        // For HTTP OPTIONS verb/method reply with ACCEPTED status code -- per CORS handshake
+        // 例如说，vue axios 请求时，会自带该逻辑的
+        HttpServletRequest req = (HttpServletRequest) request;
+        if (req.getMethod().equals("OPTIONS")) {
+            resp.setStatus(HttpServletResponse.SC_ACCEPTED);
+            return;
+        }
+        // 如果是其它请求方法，则继续过滤器。
+        chain.doFilter(request, response);
+    }
+
+    @Override
+    public void destroy() {
+    }
+
+}