Tomcat Access-Control-Allow-Origin(同源策略)解決方案
Phoenix 2018.3.1 21:05 浏览(使用tomcat配置cdn服务器时,css文件能正常加载,但是加载字体文件时出现了Access-Control-Allow-Origin错误:
已拦截跨源请求:同源策略禁止读取位于 http://localhost:9999/font-awesome/fonts/fontawesome-webfont.woff2?v=4.5.0 的远程资源。(原因:CORS 头缺少 'Access-Control-Allow-Origin')。(未知)
downloadable font: download failed (font-family: "FontAwesome" style:normal weight:normal stretch:normal src index:1): bad URI or cross-site access not allowed source: http://localhost:9999/font-awesome/fonts/fontawesome-webfont.woff2?v=4.5.0
原因是tomcat禁止了跨域请求。
解决方案
对于标准的war项目包,只需要增加一个filter就能取消Access-Control-Allow-Origin(以下简称CORS)的限制。
首先新建filter类
package com.itxc.filter;
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 {
HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
httpResponse.addHeader("Access-Control-Allow-Origin", "*");
filterChain.doFilter(servletRequest, servletResponse);
}
@Override
public void destroy() {
}
}
然后在web.xml
中使用上述filter即可
<filter>
<filter-name>CorsFilter</filter-name>
<filter-class>com.itxc.filter.CORSFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
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