内嵌式jetty配置跨域

内嵌式Jetty服务器配置跨域通常涉及到设置`ServletContainerInitializer`或直接修改web.xml文件中的HTTP头信息。以下是基本步骤：

1. **通过XML配置**:
在web.xml文件中添加`<filter>`元素，并配置`CrossOriginFilter`。例如：

   <filter>
     <filter-name>CORS</filter-name>
     <filter-class>org.eclipse.jetty.server.servlets.CrossOriginFilter</filter-class>
   </filter>
   <filter-mapping>
     <filter-name>CORS</filter-name>
     <url-pattern>/*</url-pattern>
     <!-- 如果需要特定的CORS允许来源 -->
     <param-name>allowedOrigins</param-name>
     <param-value>*</param-value>  <!-- 或者替换成具体的域名列表 -->
     <param-name>allowedMethods</param-name>
     <param-value>GET,POST,PUT,DELETE</param-value> <!-- 允许的方法 -->
     <param-name>allowCredentials</param-name>
     <param-value>true</param-value>  <!-- 是否允许携带cookie -->
   </filter-mapping>

2. **使用`ServletContainerInitializer`**:
如果你在Java应用中，可以创建一个实现了`ServletContainerInitializer`的类，注册`CrossOriginFilter`并自定义策略：

   @WebFilter(filterName = "CorsFilter", urlPatterns = "/*")
   public class CorsFilterInitializer implements ServletContainerInitializer {
       @Override
       protected void configure过滤器(Container container) throws ServletException {
           FilterRegistration.Dynamic cors = container.addFilter("CorsFilter", CrossOriginFilter.class);
           cors.setInitParameter(CrossOriginFilter.ALLOWED_ORIGINS_PARAM, "*");
           cors.setInitParameter(CrossOriginFilter.ACCESS_CONTROL_ALLOW_METHODS_PARAM, "GET, POST, PUT, DELETE");
           cors.setInitParameter(CrossOriginFilter.ACCESS_CONTROL_ALLOW_CREDENTIALS_PARAM, "true");
           cors.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class), true, "/*");
       }
   }

确保已添加对`CrossOriginFilter`的依赖。