SpringBoot2.0+SpringSecurity+Oauth2获取AccessToken跨域CORS访问终极解决方案

今天在搭建项目的时候遇到了Oauth2获取AccessToken跨域访问的问题，之前关于这块都是自己去实现，这次打算用Oauth2来集成SpringBoot。项目依赖如下：

     org.springframework.security.oauth
     spring-security-oauth2
2.2.1.RELEASE




     org.springframework.security
     spring-security-oauth2-client

项目搭建好后用PostMan测试一切正常，发布到测试环境后前端的伙伴去调用的时候发现存在跨域问题，自己也写一个Ajax的案例测试了下确实存在跨域问题，首先想到的是通过配置HttpSecurity去解决：

 http
	.cors()
	.and()
	.csrf().disable();

配置如上，但是发现还是不行，最后又在网上找资料，发现说这么配置可以：

http.authorizeRequests().requestMatchers(CorsUtils::isPreFlightRequest).permitAll();

试了之后发现也不行，最后通过跟踪/access/token的源码，采用了这种方式：

package com.xz.process.config;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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


@Order(Ordered.HIGHEST_PRECEDENCE)
@Configuration
public class CORSFilter implements Filter {
 
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
 
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.setHeader("Access-Control-Allow-Origin","*");
        response.setHeader("Access-Control-Allow-Credentials","true");
        response.setHeader("Access-Control-Allow-Methods","POST,GET,OPTIONS,PUT,DELETE,PATCH,HEAD");
        response.setHeader("Access-Control-Allow-Max-Age","3600");
        response.setHeader("Access-Control-Allow-Headers","*");
        if("OPTIONS".equalsIgnoreCase(request.getMethod())){
            response.setStatus(HttpServletResponse.SC_OK);
        }else{
            filterChain.doFilter(servletRequest,servletResponse);
        }
    }
 
    @Override
    public void destroy() {
 
    }
}

问题解决。

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