Springboot 跨域配置无效及接口访问报错的解决方法

跨域配置如下，Springboot 版本为 2.4.1

///跨域访问配置
@Configuration
public class CorsConfig {
 private CorsConfiguration buildConfig() {
  CorsConfiguration corsConfiguration = new CorsConfiguration();
  corsConfiguration.setAllowCredentials(true); //sessionid 多次访问一致
  corsConfiguration.addAllowedOrigin("*"); // 允许任何域名使用
  corsConfiguration.addAllowedHeader("*"); // 允许任何头
  corsConfiguration.addAllowedMethod("*"); // 允许任何方法（post、get等）
  return corsConfiguration;
 }

 @Bean
 public CorsFilter corsFilter() {
  UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
  source.registerCorsConfiguration("/**", buildConfig()); // 对接口配置跨域设置
  return new CorsFilter(source);
 }
}

问题：跨域配置无效，访问接口报如下错误

java.lang.IllegalArgumentException: When allowCredentials is true, allowedOrigins cannot contain the special value "*"since that cannot be set on the "Access-Control-Allow-Origin" response header. To allow credentials to a set of origins, list them explicitly or consider using "allowedOriginPatterns" instead.
	at org.springframework.web.cors.CorsConfiguration.validateAllowCredentials(CorsConfiguration.java:453) ~[spring-web-5.3.2.jar:5.3.2]
	at org.springframework.web.cors.CorsConfiguration.checkOrigin(CorsConfiguration.java:557) ~[spring-web-5.3.2.jar:5.3.2]
	at org.springframework.web.cors.DefaultCorsProcessor.checkOrigin(DefaultCorsProcessor.java:174) ~[spring-web-5.3.2.jar:5.3.2]
	at org.springframework.web.cors.DefaultCorsProcessor.handleInternal(DefaultCorsProcessor.java:116) ~[spring-web-5.3.2.jar:5.3.2]
	at org.springframework.web.cors.DefaultCorsProcessor.processRequest(DefaultCorsProcessor.java:95) ~[spring-web-5.3.2.jar:5.3.2]
	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:87) ~[spring-web-5.3.2.jar:5.3.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.2.jar:5.3.2]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.2.jar:5.3.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.2.jar:5.3.2]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.2.jar:5.3.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.2.jar:5.3.2]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.2.jar:5.3.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.2.jar:5.3.2]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:888) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1597) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_60]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_60]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.41.jar:9.0.41]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60]

分析：

由于我是升级了 Springboot 到 2.4.1 版本之后才出现的这个问题，再结合报错信息提示不能使用*号设置允许的Origin，所以有两个解决方法。

解决方法：

1、降低 Springboot 版本

 <modelVersion>4.0.0</modelVersion>
 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.3.5.RELEASE</version>
  <relativePath/> <!-- lookup parent from repository -->
 </parent>

2、如果不降低版本，则在跨域设置时使用setAllowedOriginPatterns方法

///跨域访问配置
@Configuration
public class CorsConfig {
 private CorsConfiguration buildConfig() {
  CorsConfiguration corsConfiguration = new CorsConfiguration();
  corsConfiguration.setAllowCredentials(true); //sessionid 多次访问一致

  // 允许访问的客户端域名
  List<String> allowedOriginPatterns = new ArrayList<>();
  allowedOriginPatterns.add("*");
  corsConfiguration.setAllowedOriginPatterns(allowedOriginPatterns);
//  corsConfiguration.addAllowedOrigin("*"); // 允许任何域名使用
  corsConfiguration.addAllowedHeader("*"); // 允许任何头
  corsConfiguration.addAllowedMethod("*"); // 允许任何方法（post、get等）
  return corsConfiguration;
 }

 @Bean
 public CorsFilter corsFilter() {
  UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
  source.registerCorsConfiguration("/**", buildConfig()); // 对接口配置跨域设置
  return new CorsFilter(source);
 }
}

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