// 使用Filter方式
@WebFilter("/*")
public class CorsFilter 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-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "Content-Type, x-requested-with");
        chain.doFilter(req, res);
    }
    // 其他方法省略...
}

// 或者在Spring Boot中使用注解
@CrossOrigin(origins = "*")
@RestController
public class MyController {
    // 控制器方法
}

@RequestMapping(value = "/api/data", method = RequestMethod.GET)
public void getData(@RequestParam("callback") String callback, HttpServletResponse response) 
    throws IOException {
    String jsonData = "{\"name\":\"John\", \"age\":30}";
    response.setContentType("application/javascript");
    response.getWriter().write(callback + "(" + jsonData + ")");
}

$.ajax({
    url: 'http://otherdomain.com/api/data',
    dataType: 'jsonp',
    jsonp: 'callback',
    success: function(data) {
        console.log(data);
    }
});

$.ajax({
    url: 'http://otherdomain.com/api',
    type: 'GET', // 或 'POST'
    crossDomain: true,
    dataType: 'json',
    success: function(response) {
        console.log(response);
    },
    error: function(xhr, status, error) {
        console.error(error);
    }
});