跨域请求

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老生常谈，简述，直接上代码！

一开始按照想在TOMCAT下,直接配置的，按照tomcat公网说法怎么试都有问题，后台在工程中添加自己的Filter,下面是具体操作。

一.创建Filter Class

package xxxxx.filter;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;import org.springframework.stereotype.Component;@Componentpublic 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;        String origin = (String) servletRequest.getRemoteHost() + ":" + servletRequest.getRemotePort();        response.setHeader("Access-Control-Allow-Origin", "*");        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");        response.setHeader("Access-Control-Max-Age", "3600");        response.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorization");        response.setHeader("Access-Control-Allow-Credentials", "true");        filterChain.doFilter(servletRequest, servletResponse);    }    @Override    public void destroy() {    }}

二.配置工程下web.xml

<filter>          <filter-name>corsFilter</filter-name>          <filter-class>cn.carowl.filter.CorsFilter</filter-class>      </filter>      <filter-mapping>          <filter-name>corsFilter</filter-name>          <url-pattern>/*</url-pattern>      </filter-mapping>

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