需要使用geoserver rest在前端进行服务发布，所以解决geoserver跨域问题。
一、windwos安装包2.21.0版本Geoserver解决跨域（测试，可行）
打开geoserver\webapps\geoserver\WEB-INF下的web.xml文件。
去掉注释，在bin文件夹下startup.bat重启即可。
<!-- Uncomment following filter to enable CORS in Jetty. Do not forget the second config block further down.-->
<filter>
<filter-name>cross-origin</filter-name>
<filter-class>org.eclipse.jetty.servlets.CrossOriginFilter</filter-class>
<init-param>
<param-name>chainPreflight</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>allowedOrigins</param-name>
<param-value>*</param-value>
</init-param>
<init-param>
<param-name>allowedMethods</param-name>
<param-value>GET,POST,PUT,DELETE,HEAD,OPTIONS</param-value>
</init-param>
<init-param>
<param-name>allowedHeaders</param-name>
<param-value>*</param-value>
</init-param>
</filter>
<!-- Uncomment following filter to enable CORS-->
<filter-mapping>
<filter-name>cross-origin</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
二、tomcat部署的独立版本geoserver跨域（未测试）。
打开geoserver\webapps\geoserver\WEB-INF下的web.xml文件。重启geoserver。
<!-- Uncomment following filter to enable CORS in Tomcat. Do not forget the second config block further down.
<filter>
<filter-name>cross-origin</filter-name>
<filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
<init-param>
<param-name>cors.allowed.origins</param-name>
<param-value>*</param-value>
</init-param>
<init-param>
<param-name>cors.allowed.methods</param-name>
<param-value>GET,POST,PUT,DELETE,HEAD,OPTIONS</param-value>
</init-param>
<init-param>
<param-name>cors.allowed.headers</param-name>
<param-value>*</param-value>
</init-param>
</filter>
-->
<!-- Uncomment following filter to enable CORS-->
<filter-mapping>
<filter-name>cross-origin</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
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