跨域

解决跨域问题

/**
 * Created by HJB on 2019/7/4.
 */
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
public class WebContextFilter implements Filter {

    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletResponse  httpServletResponse = (HttpServletResponse) response;
        HttpServletRequest  httpServletRequest = (HttpServletRequest) request;
        httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", "*");
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "OPTIONS,GET,POST,DELETE,PUT");
        System.out.println("----------------");
        String method = httpServletRequest.getMethod();
        if ("OPTIONS".equalsIgnoreCase(httpServletRequest.getMethod())) {
            System.out.println("SC_OK");
            httpServletResponse.setStatus(HttpServletResponse.SC_OK);
            chain.doFilter(httpServletRequest, httpServletResponse);
        } else {
            chain.doFilter(httpServletRequest, httpServletResponse);
        }
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub

    }

}