解决SpringBoot 前后端分离跨域问题

最近在开发的项目是前后端分离的，前端调我的接口，总是传不过来数据？？

然后我就求助了强大的度娘~~

原来是需要配置过滤器。。。

直接上代码吧：

package com.gis.eonline.common.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Description: 过滤器
 * @Author zjh
 * @Date 2019-10-11 15:35
 */

@WebFilter(filterName = "OriginFilter",urlPatterns = {"/*"})
@Order(value = 1)
@Configuration
public class OriginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void destroy() {

    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
                         FilterChain filterChain)
            throws IOException, ServletException {
        System.out.println("OriginFilter 过滤器 执行了");
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        // 响应标头指定 指定可以访问资源的URI路径
        response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
        //响应标头指定响应访问所述资源到时允许的一种或多种方法
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE,PUT");
        //设置 缓存可以生存的最大秒数
        response.setHeader("Access-Control-Max-Age", "3600");
        //设置  受支持请求标头
        response.setHeader("Access-Control-Allow-Headers", "Content-Type,Content-Length,Authorization,Accept,X-Requested-With,yourHeaderFeild,X-CAF-Authorization-Token,sessionToken,credential,X-XSRF-TOKEN,token,username,client");
        // 指示的请求的响应是否可以暴露于该页面。当true值返回时它可以被暴露
        response.setHeader("Access-Control-Allow-Credentials", "true");
        if (((HttpServletRequest) servletRequest).getMethod().equals("OPTIONS")) {
            System.out.println("OPTIONS");
            response.getWriter().println("ok");
            return;
        }
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

           

稍微解释下

@WebFilter(filterName = “OriginFilter”,urlPatterns = {"/"})

配置/，输入任何路径都能进过滤器

基本上大部分都能用了~

后面有空的话，应该会上传关于MVC配置拦截器的内容吧~