What are the different ways for cross-origin access in Java?

There are several main ways to achieve cross-origin access in Java.

1. JSONP (JSON with Padding) involves passing request data to the server as parameters through dynamically created tags, and handling the server’s returned data in a callback function. CORS (Cross-Origin Resource Sharing) is achieved by setting response headers on the server to allow specified domains to access resources across domains. A proxy server is set up on the server side to enable clients to access resources from other domains through the proxy server. WebSocket is a protocol for full-duplex communication on a single TCP connection, allowing for cross-origin access. Nginx reverse proxy involves configuring the nginx file to forward requests to resources under different domains. JSONP and CORS are commonly used methods among the mentioned options.