springboot文件上传跨域

前端:

//跨域认证
axios.defaults.withCredentials = false
axios.defaults.crossDomain = true

 

后端:

2个类复制进去

启动类添加包扫描

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * Cros协议的配置类。
 * 继承WebMvcConfigurerAdapter，并且重写方法addCorsMappings。
 * addCorsMappings方法是用于增加Cros协议配置的方法。默认的实现是空实现。也就是说，在默认的配置环境中，是不进行Cros协议的配置的。
 */
@Configuration
public class CrosConfiguration extends WebMvcConfigurerAdapter {


    @Autowired
    ProcessInterceptor processInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 添加拦截器(拦截器中只有preHandle返回true时才继续执行下一个拦截器或者controller，否则直接返回)
        // registry.addInterceptor(logInterceptor).addPathPatterns("/**");
        registry.addInterceptor(processInterceptor).addPathPatterns("/**");
        //registry.addInterceptor(csrCheckInterceptor).addPathPatterns("/**");
        //registry.addInterceptor(menuAuthInterceptor).addPathPatterns("/**");
        super.addInterceptors(registry);
    }
    /**
     * 就是注册的过程，注册Cors协议的内容。
     * 如： Cors协议支持哪些请求URL，支持哪些请求类型，请求时处理的超时时长是什么等。
     * @param registry - 就是用于注册Cros协议内容的一个注册器。
     */
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry
                .addMapping("/**")// 所有的当前站点的请求地址，都支持跨域访问。
                .allowedMethods("GET", "POST", "PUT", "DELETE","OPTIONS") // 当前站点支持的跨域请求类型是什么。
                .allowCredentials(true) // 是否支持跨域用户凭证
                .allowedHeaders("*")
                .allowedOrigins("*") // 所有的外部域都可跨域访问。 如果是localhost则很难配置，因为在跨域请求的时候，外部域的解析可能是localhost、127.0.0.1、主机名
                .maxAge(3600); // 超时时长设置为1小时。 时间单位是秒。
    }
}

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author:Administrator
 * @date:2019/10/9
 */
@Component
public class ProcessInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {

        httpServletResponse.setHeader("Access-Control-Allow-Headers", "X-Requested-With, Accept, Content-Type,Authorization");
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
        String origin = httpServletRequest.getHeader("Origin");
        httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
        // 是否允许浏览器携带用户身份信息（cookie）,设置为true,必须设置域名,不能使用通配符
//        httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");
//        httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");

//        httpServletResponse.setHeader("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");

//        httpServletResponse.setHeader("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");

        String method = httpServletRequest.getMethod();

        if (method.equals("OPTIONS")) {
            httpServletResponse.setStatus(200);
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}