cors FILTER in java 7

https://howtodoinjava.com/servlets/java-cors-filter-example/

create the class:

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.annotation.WebFilter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

/**

 * Servlet Filter implementation class CORSFilter

 */

// Enable it for Servlet 3.x implementations

/* @ WebFilter(asyncSupported = true, urlPatterns = { "/*" }) */

public class CORSFilter implements Filter {

 

    /**

     * Default constructor.

     */

    public CORSFilter() {

        // TODO Auto-generated constructor stub

    }

 

    /**

     * @see Filter#destroy()

     */

    public void destroy() {

        // TODO Auto-generated method stub

    }

 

    /**

     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)

     */

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)

            throws IOException, ServletException {

 

        HttpServletRequest request = (HttpServletRequest) servletRequest;

        System.out.println("CORSFilter HTTP Request: " + request.getMethod());

 

        // Authorize (allow) all domains to consume the content

        ((HttpServletResponse) servletResponse).addHeader("Access-Control-Allow-Origin", "*");

        ((HttpServletResponse) servletResponse).addHeader("Access-Control-Allow-Methods","GET, OPTIONS, HEAD, PUT, POST");

 

        HttpServletResponse resp = (HttpServletResponse) servletResponse;

 

        // For HTTP OPTIONS verb/method reply with ACCEPTED status code -- per CORS handshake

        if (request.getMethod().equals("OPTIONS")) {

            resp.setStatus(HttpServletResponse.SC_ACCEPTED);

            return;

        }

 

        // pass the request along the filter chain

        chain.doFilter(request, servletResponse);

    }

 

    /**

     * @see Filter#init(FilterConfig)

     */

    public void init(FilterConfig fConfig) throws ServletException {

        // TODO Auto-generated method stub

    }

 

}







add im web.xml







Now register this filter in web.xml.

<filter>     <filter-name>CorsFilter</filter-name>     <filter-class>com.howtodoinjava.examples.cors.CORSFilter</filter-class> </filter>   <filter-mapping>     <filter-name>CorsFilter</filter-name>     <url-pattern>/*</url-pattern> </filter-mapping>