https://developer.aliyun.com/article/70084

第一种方式

下载cors-filter-1.7.jar，java-property-utils-1.9.jar这两个库文件，放到lib目录下。（可在

http://search.maven.org上查询并下载。）

maven 依赖

<dependency>
	    <groupId>com.thetransactioncompany</groupId>
	    <artifactId>cors-filter</artifactId>
	    <version>1.7.1</version>
	</dependency>
	<dependency>
	    <groupId>com.thetransactioncompany</groupId>
	    <artifactId>java-property-utils</artifactId>
	    <version>1.9</version>
	</dependency>

web.xml中的配置如下：

<filter>
       <filter-name>CORS</filter-name>
       <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>
       <init-param>
        <param-name>cors.allowOrigin</param-name>
           <param-value>*</param-value>
       </init-param>
       <init-param>
        <param-name>cors.supportedMethods</param-name>
           <param-value>GET, POST, HEAD, PUT, DELETE</param-value>
       </init-param>
       <init-param>
        <param-name>cors.supportedHeaders</param-name>
           <param-value>Accept, Origin, X-Requested-With, Content-Type, Last-Modified</param-value>
       </init-param>
       <init-param>
           <param-name>cors.exposedHeaders</param-name>
           <param-value>Set-Cookie</param-value>
       </init-param>
       <init-param>
           <param-name>cors.supportsCredentials</param-name>
           <param-value>true</param-value>
       </init-param>
   </filter>

   <filter-mapping>
       <filter-name>CORS</filter-name>
       <url-pattern>/*</url-pattern>
   </filter-mapping>

第二种方式

直接在web.xml中

此时使用的tomcat的catalina，不需要下载任何jar，也不需要引入，此时鼠标放在org.apache.catalina.filters.CorsFilter是点不过去的

<filter>
		<filter-name>CorsFilter</filter-name>
		<filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>CorsFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>