Java中后台解决请求跨域问题

新建一个过滤器Filter

public class CorsFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
            ServletException {
        // TODO Auto-generated method stub
        HttpServletResponse res = (HttpServletResponse) response;
        res.setContentType("text/html;charset=UTF-8");
        res.setHeader("Access-Control-Allow-Origin", "*");
        res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        res.setHeader("Access-Control-Max-Age", "0");
        res.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");
        res.setHeader("Access-Control-Allow-Credentials", "true");
        res.setHeader("XDomainRequestAllowed", "1");
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
    // TODO Auto-generated method stub
    }
}

　　然后在web.xml中配置

    <filter>
          <filter-name>cors</filter-name>
        <filter-class>com.hitalking.core.shiro.CorsFilter</filter-class>
     </filter>
     <filter-mapping>
        <filter-name>cors</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

重启应用，这样即可解决访问跨域问题。