springboot+angular4前后端分离 跨域问题解决详解

springboot中新增一个过滤器如下：

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
 */
@Component
public 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() {
  }
}

在接口中指定需要的方法类型

angular页面发送http请求：

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);
      })
     }

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