springmvc>>>ssm添加跨域>>基于maven

在pom.xml文件中添加

   <groupId>com.thetransactioncompany</groupId>  
   <artifactId>java-property-utils</artifactId>  
   <version>1.9.1</version>  

   <groupId>com.google.code.gson</groupId>  
   <artifactId>gson</artifactId>  
   <version>2.6.2</version>  

com.thetransactioncompany
cors-filter
1.3.2

之后在web.xml中添加

跨域过滤器
CORS
com.thetransactioncompany.cors.CORSFilter

<param-name>cors.allowOrigin</param-name>    
   <param-value>*</param-value>    

<param-name>cors.supportedMethods</param-name>    
   <param-value>GET, POST, HEAD, PUT, DELETE</param-value>    

<param-name>cors.supportedHeaders</param-name>    
   <param-value>Accept, Origin, X-Requested-With, Content-Type, Last-Modified</param-value>    

   <param-name>cors.exposedHeaders</param-name>    
   <param-value>Set-Cookie</param-value>    

   <param-name>cors.supportsCredentials</param-name>    
   <param-value>true</param-value>    

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

即可解决前端访问后端的跨域问题