package com.hy.fliter;
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;
import org.apache.commons.httpclient.HttpStatus;
/**
* Created by WangShuai on 2016/7/30.
*/
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 {
HttpServletResponse response = (HttpServletResponse) servletResponse;
HttpServletRequest request = (HttpServletRequest) servletRequest;
// 指定允许其他域名访问
response.setHeader("Access-Control-Allow-Origin", "*");
// 响应类型
response.setHeader("Access-Control-Allow-Methods", "POST, GET, DELETE, OPTIONS, DELETE");
// 响应头设置
response.setHeader("Access-Control-Allow-Headers", "Content-Type, x-requested-with, X-Custom-Header, HaiYi-Access-Token");
if ("OPTIONS".equals(request.getMethod())){
response.setStatus(HttpStatus.SC_NO_CONTENT);
}
filterChain.doFilter(servletRequest, servletResponse);
}
@Override
public void destroy() { }
}

<filter>
<filter-name>cors</filter-name>
<filter-class>com.hy.fliter.CorsFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>cors</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>