解決SpringBoot 前後端分離跨域問題

最近在開發的項目是前後端分離的，前端調我的接口，總是傳不過來資料？？

然後我就求助了強大的度娘~~

原來是需要配置過濾器。。。

直接上代碼吧：

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: 過濾器
 * @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 過濾器 執行了");
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        // 響應标頭指定 指定可以通路資源的URI路徑
        response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
        //響應标頭指定響應通路所述資源到時允許的一種或多種方法
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE,PUT");
        //設定 緩存可以生存的最大秒數
        response.setHeader("Access-Control-Max-Age", "3600");
        //設定  受支援請求标頭
        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");
        // 訓示的請求的響應是否可以暴露于該頁面。當true值傳回時它可以被暴露
        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);
    }
}

           

稍微解釋下

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

配置/，輸入任何路徑都能進過濾器

基本上大部分都能用了~

後面有空的話，應該會上傳關于MVC配置攔截器的内容吧~