前臺發起請求後報錯

Failed to load http://192.168.1.107:8066/talk/queryList: Response to preflight request 
doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on 
the requested resource. Origin 'http://192.168.1.107:8080' is therefore not allowed access.

參考了兩個文章：

https://www.2cto.com/kf/201711/700228.html

https://www.jianshu.com/p/f37f8c295057

解決辦法是：

配置類

@Configuration
public class CorsConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        //設定允許跨域的路徑
        registry.addMapping("/**")
                //設定允許跨域請求的域名
                .allowedOrigins("*")
                //是否允許證書 不再預設開啟
                .allowCredentials(true)
                //設定允許的方法
                .allowedMethods("*")
                .allowedHeaders("*")
                //跨域允許時間
                .maxAge(3600);
    }
}
 

過濾器裡面設定下：

if (req.getMethod().equals(RequestMethod.OPTIONS.name())) {
        chain.doFilter(request, response);
}

如果是options請求則不進行那些校驗，

因為我這裡options請求無法攜帶頭請求，但具體是不是所有的options都無法攜帶頭請求我也不知道，別人告訴我說因為這個options自動生成的所以沒有攜帶頭請求，如果自己生成的可以攜帶

package com.qky.qingchi.config;

import com.qky.qingchi.util.CookieUtils;
import com.qky.qingchi.util.TokenUtils;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.RequestMethod;

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

@Configuration
@WebFilter(filterName = "myFilter", urlPatterns = "/*")
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig arg0) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        if (req.getMethod().equals(RequestMethod.OPTIONS.name())) {
            chain.doFilter(request, response);
        }

        String cookieToken = CookieUtils.getCookie(req, "token");

        String headerToken = req.getHeader("token");
        System.out.println("headerToken27:" + headerToken);
        if (TokenUtils.notCorrect(headerToken) && !req.getRequestURI().contains("login")) {
            return;
        }
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
    }
}
 

之前我沒有加

if (req.getMethod().equals(RequestMethod.OPTIONS.name())) {
        chain.doFilter(request, response);
}

這行程式碼，所有請求都去獲取token，然後options請求是獲取不到header裡面的token的，所以會報錯，