java通过过滤器实现跨域

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1.修改web.xml 引入过滤器

 <filter>    <filter-name>CORSFilter</filter-name>    <filter-class>com.sein.lims.filter.InitCORSFilter</filter-class></filter><filter-mapping>    <filter-name>CORSFilter</filter-name>    <url-pattern>*.whtm</url-pattern></filter-mapping>

// 凡事.whtm的请求都允许跨越请求

2.编辑过滤器
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

/**
* CORSFilter 解决跨域问题
* @author yut
*
*/
@Component
public class InitCORSFilter extends OncePerRequestFilter {

private Logger logger = LoggerFactory.getLogger(InitCORSFilter.class);public InitCORSFilter() {    logger.info("==== 初始化系统允许跨域请求 ====");}/** * 解决跨域：Access-Control-Allow-Origin，值为*表示服务器端允许任意Domain访问请求 */@Overrideprotected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)        throws ServletException, IOException {    /*if (request.getHeader("Access-Control-Request-Method") != null && "OPTIONS".equals(request.getMethod())) {*/        response.addHeader("Access-Control-Allow-Origin", "*");        response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");        response.addHeader("Access-Control-Allow-Headers", "origin, content-type, accept, x-requested-with, sid, mycustom, smuser");        response.addHeader("Access-Control-Max-Age", "1800");//30 min    /*}*/    filterChain.doFilter(request, response);}

}

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