通过添加filter过滤器 彻底解决ajax 跨域问题

时间：2021-10-14 05:19:18

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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