关于跨域问题

方法一：

@Configuration
public class GlobalCorsConfig {
 
    @Bean
    public CorsFilter corsFilter() {
        //1. 添加 CORS配置信息
        CorsConfiguration config = new CorsConfiguration();
        //放行哪些原始域
        config.addAllowedOrigin("*");
        //是否发送 Cookie
        config.setAllowCredentials(true);
        //放行哪些请求方式
        config.addAllowedMethod("*");
        //放行哪些原始请求头部信息
        config.addAllowedHeader("*");
        //暴露哪些头部信息
        config.addExposedHeader("*");
        //2. 添加映射路径
        UrlBasedCorsConfigurationSource corsConfigurationSource = new UrlBasedCorsConfigurationSource();
        corsConfigurationSource.registerCorsConfiguration("/**",config);
        //3. 返回新的CorsFilter
        return new CorsFilter(corsConfigurationSource);
    }
}

方法二：

@Configuration
public class CorsConfig implements WebMvcConfigurer {
 
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                //是否发送Cookie
                .allowCredentials(true)
                //放行哪些原始域
                .allowedOrigins("*")
                .allowedMethods(new String[]{"GET", "POST", "PUT", "DELETE"})
                .allowedHeaders("*")
                .exposedHeaders("*");
    }
}

方法三：

@CrossOrigin

方法四：

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.HttpServletResponse;
import org.springframework.stereotype.Component;
 
@Component
public class CorsFilter implements Filter {
 
  public void doFilter(ServletRequest req, ServletResponse res, 
  FilterChain chain) throws IOException, ServletException {
  
    HttpServletResponse response = (HttpServletResponse) res;
    response.setHeader("Access-Control-Allow-Origin", "*");
    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
    response.setHeader("Access-Control-Max-Age", "3600");
    response.setHeader("Access-Control-Allow-Headers", "x-requested-with,content-type");
    chain.doFilter(req, res);
    
  }
  
  public void init(FilterConfig filterConfig) {}
  public void destroy() {}
}

方法五：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.reactive.CorsWebFilter;
import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource;
import org.springframework.web.reactive.config.CorsRegistry;
import org.springframework.web.reactive.config.WebFluxConfigurer;
import org.springframework.web.util.pattern.PathPatternParser;

/**
 * @author wuyc
 * @date 2024-10-15 01:20:43
 * @description 全局跨域配置
 */
@Configuration
public class GlobalCorsConfig implements WebFluxConfigurer {

    /**
     * 方案一
     * @return
     */
    @Bean
    public CorsWebFilter corsFilter() {
        CorsConfiguration config = new CorsConfiguration();

        config.setAllowCredentials(true); // 允许cookies跨域
        config.addAllowedOrigin("*");// #允许向该服务器提交请求的URI，*表示全部允许，在SpringMVC中，如果设成*，会自动转成当前请求头中的Origin
        config.addAllowedHeader("*");// #允许访问的头信息,*表示全部
        config.addAllowedMethod("*");// 允许提交请求的方法类型，*表示全部允许
        config.setMaxAge(18000L);// 预检请求的缓存时间（秒），即在这个时间段里，对于相同的跨域请求不会再预检了

        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());
        source.registerCorsConfiguration("/**", config);

        return new CorsWebFilter(source);
    }

    /**
     * 方案二 实现WebFluxConfigurer重写addCorsMappings方法
     * @param registry
     */
   /* @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")//允许路径
                .allowedHeaders("*")
                .allowedOrigins("*")
                .allowedMethods("*")
                .allowCredentials(true)
                .maxAge(36000);
    }*/
}

方案四：

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

• @author shangmuzhuqin
  */

@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
public class CorsFilter implements Filter{

@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

    HttpServletResponse response = (HttpServletResponse) res;
    HttpServletRequest request = (HttpServletRequest) req;
    // response.setHeader("Access-Control-Allow-Origin", "*");
    // 以下是比较安全的用法
    response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
    response.setHeader("Access-Control-Max-Age", "3600");
    response.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization, form-type");

    chain.doFilter(req, res);
}

}

附注：uniapp的uni.request对跨域的session很不友好，并且似乎是不支持携带session，没有在文档中找到具体信息，此记

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