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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