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这篇适用于已分别搭建好Vue和SSM的人群

1. 
   后端SSM添加过滤器代码处理跨域请求
   
   （我的是放在src/filter/CorsFilter.java）

   package filter;
   
   import javax.servlet.*;
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
   import org.apache.commons.lang.StringUtils;
   import java.io.IOException;
   
   public class CorsFilter implements Filter {
   	@Override
       public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
           HttpServletResponse response = (HttpServletResponse) res;
           HttpServletRequest request = (HttpServletRequest) req;
    
           // 不使用*，自动适配跨域域名，避免携带Cookie时失效
           String origin = request.getHeader("Origin");
           if(StringUtils.isNotBlank(origin)) {
               response.setHeader("Access-Control-Allow-Origin", origin);
           }
    
           // 自适应所有自定义头
           String headers = request.getHeader("Access-Control-Request-Headers");
           if(StringUtils.isNotBlank(headers)) {
               response.setHeader("Access-Control-Allow-Headers", headers);
               response.setHeader("Access-Control-Expose-Headers", headers);
           }
    
           // 允许跨域的请求方法类型
           response.setHeader("Access-Control-Allow-Methods", "*");
           // 预检命令（OPTIONS）缓存时间，单位：秒
           response.setHeader("Access-Control-Max-Age", "3600");
           // 明确许可客户端发送Cookie，不允许删除字段即可
           response.setHeader("Access-Control-Allow-Credentials", "true");
           
           chain.doFilter(request, response);
       }
    
       @Override
       public void init(FilterConfig filterConfig) {
       }
    
       @Override
       public void destroy() {
       }
    
   }
   
   

   2.
   
   后端SSM配置文件中配置过滤器
   
   (我的是配在WebContent/WEB-INF/web.xml配置文件中)

   filter-class: 是你的CorsFilter.java路径

   <!--配置允许跨域访问-->
   	<filter>
   	    <filter-name>CorsFilter</filter-name>
   	    <filter-class>filter.CorsFilter</filter-class>
   	</filter>
   	<filter-mapping>
   	    <filter-name>CorsFilter</filter-name>
   	    <url-pattern>/*</url-pattern>
   	</filter-mapping>
   

   3.
   
   后端SSM配置前端过滤器
   
   （我的是放在WebContent/WEB-INF/web.xml配置文件中）

   配置此过滤器作用：让SSM只识别前端发送的xxx.do请求，

   ​ 相对应的后端控制器中@RequestMapping(xxx.do)需设置成如此

   <!-- 配置前端过滤器  -->
   	<servlet>
     	<servlet-name>springmvc</servlet-name>
     	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     	<init-param>
     		<param-name>contextConfigLocation</param-name>
   		<param-value/>
     	</init-param>
     	<load-on-startup>1</load-on-startup>
     	</servlet>
     	<servlet-mapping>
     		<servlet-name>springmvc</servlet-name>
     		<url-pattern>*.do</url-pattern>
     	</servlet-mapping>
   

   就解决啦，哦耶！