实现AJAX跨域访问方式一

1.添加pom依赖

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

2.在web.xml 中增加配置

<!-- 添加解决跨域的代码配置，基于pom中有cors-filter的依赖 ，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>
    <!-- 添加解决跨域的代码配置，基于pom中有cors-filter的依赖 ，end -->