JAVA高级面试进阶训练营视频教程

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1、在web.xml添加filter

<filter>
<filter-name>contextfilter</filter-name>
<filter-class>com.cf.hr.filter.WebContextFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>contextfilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

2、filter实现

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.HttpServletResponse;

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;
		httpServletResponse.setHeader("Access-Control-Allow-Origin", "*"); 
		httpServletResponse.setHeader("Access-Control-Allow-Headers", "accept,content-type");  
		httpServletResponse.setHeader("Access-Control-Allow-Methods", "OPTIONS,GET,POST,DELETE,PUT");  
		chain.doFilter(request, httpServletResponse);
		
	}

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

}

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