允许跨域访问的过滤器

在web.xml文件中加入一个过滤器:

<filter>
		<filter-name>CorsFilter</filter-name>
		<filter-class>cn.test.CorsFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>CorsFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

 过滤器如下

package cn.test;

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
 
public class CorsFilter implements Filter {
 
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
 
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
       System.out.println("允许跨域");
    	HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
        httpResponse.addHeader("Access-Control-Allow-Origin", "*");
        httpResponse.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
        httpResponse.setHeader("Access-Control-Allow-Methods", "GET, PUT, DELETE, POST");
        filterChain.doFilter(servletRequest, servletResponse);
    }
 
    @Override
    public void destroy() {
 
    }
}

 因为今天装了个swaggerapi/swagger-ui，装的docker镜像

写道

sudo docker pull swaggerapi/swagger-ui
sudo docker run -p 80:8080 swaggerapi/swagger-ui

 然后不知道把想显示的json传上去，所以只好又起了个服务，用来提供json让swagger-ui，这时就需要解决跨域问题了。