springboot+angular4前后端分离 跨域问题解决详解

package com.rtpksps.kss.config;import org.springframework.stereotype.Component;import javax.servlet.*;import javax.servlet.http.HttpServletResponse;import java.io.IOException;/** * @author Administrator * @title: OriginFilter * @projectName rtpksps-kss * @description: TODO * @date 2019/9/29 0029下午 15:52 */@Componentpublic class OriginFilter implements Filter {  @Override  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {    HttpServletResponse response = (HttpServletResponse) servletResponse;    response.setHeader("Access-Control-Allow-Origin", "*");    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE,PUT");    response.setHeader("Access-Control-Max-Age", "3600");    response.setHeader("Access-Control-Allow-Headers", "x-requested-with");    filterChain.doFilter(servletRequest, servletResponse);  }  @Override  public void init(FilterConfig filterConfig) throws ServletException {  }  @Override  public void destroy() {  }}

reqData(){ // 向后台请求数据      var url = "http://192.168.100.100:8888/cmsRole/show";//视频教程中的测试用请求地址      var _that = this;      this.http.get(url).subscribe(function(data){//请求成功的回调函数     console.log(data);      },function(err){// 请求失败的回调函数       console.log(err);      })     }