1.添加pom依賴

<dependency>
     <groupId>com.thetransactioncompany</groupId>
      <artifactId>cors-filter</artifactId>
      <version>2.6<ersion>
<!--<scope>runtime</scope>-->
</dependency>

2.在web.xml 中增加配置

<!-- 添加解決跨域的代碼配置，基於pom中有cors-filter的依賴 ，begin --> 
    <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</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> 
    <!-- 添加解決跨域的代碼配置，基於pom中有cors-filter的依賴 ，end --> 

實現AJAX跨域訪問方式一