java后端解决跨域问题

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/TOP__ONE/article/details/76239548

1.新建一个filter

public class CORSFilter extends Filter {

	/**
	 * 跨域处理
	 * 
	 * @param request
	 * @param response
	 * @param filterChain
	 * @throws ServletException
	 * @throws IOException
	 */
	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
			throws ServletException, IOException {

		response.addHeader("Access-Control-Allow-Origin", "*");
		if (request.getHeader("Access-Control-Request-Method") != null && "OPTIONS".equals(request.getMethod())) {
			response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
			response.addHeader("Access-Control-Allow-Headers", "Content-Type");
			response.addHeader("Access-Control-Max-Age", "1");
		}

		filterChain.doFilter(request, response);
	}
}

2.另外web.xml中新增配置

<filter>
		<filter-name>CORS</filter-name>
		<filter-class>com.ymerp.support.CORSFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>CORS</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>