Access-Control-Allow-Origin

Access-Control-Allow-Origin 에러 발생

•  ajax 요청시 요청 도메인이 다를 시 나타나는 현상

java 파일에  헤더 설정

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package egovframework.example.util;

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.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class CrossDomainFilter implements Filter {

      @Override

      public void destroy() {

            // TODO Auto-generated method stub

      }

      @Override

      public void doFilter(ServletRequest request, ServletResponse servletResponse,

                  FilterChain chain) throws IOException, ServletException {

            // TODO Auto-generated method stub

            if (!(request instanceof HttpServletRequest)) {

                  throw new ServletException("This filter can "

                              + " only process HttpServletRequest requests");

            }

            HttpServletResponse response = (HttpServletResponse) servletResponse;

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

            response.setHeader("Access-Control-Allow-Headers", "origin, x-requested-with, content-type, accept");

            chain.doFilter(request, response);

      }

      @Override

      public void init(FilterConfig arg0) throws ServletException {

            // TODO Auto-generated method stub

      }

}

web.xml

---

      <filter>

          <filter-name>CrossDomainFilter</filter-name>

          <filter-class>egovframework.example.util.CrossDomainFilter</filter-class>

      </filter>

      

      <filter-mapping>

          <filter-name>CrossDomainFilter</filter-name>

          <url-pattern>*.do</url-pattern>

      </filter-mapping>