解决线上项目访问tomcat跨域问题

在tomcat的目录下找到\conf\web.xml 在web_app 标签内添加如下代码：

<filter>
    <filter-name>CorsFilter</filter-name>
    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
    <init-param>
        <param-name>cors.allowed.origins</param-name>
        <param-value>*</param-value> <!-- 允许所有来源 -->
    </init-param>
    <init-param>
        <param-name>cors.allowed.methods</param-name>
        <param-value>GET,POST,HEAD,OPTIONS,PUT,DELETE</param-value> <!-- 允许的请求方法 -->
    </init-param>
    <init-param>
        <param-name>cors.allowed.headers</param-name>
        <param-value>Authorization,Content-Type,Accept,Origin,X-Requested-With</param-value> <!-- 允许的请求头 -->
    </init-param>
    <init-param>
        <param-name>cors.exposed.headers</param-name>
        <param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value> <!-- 允许的响应头 -->
    </init-param>
    <init-param>
        <param-name>cors.support.credentials</param-name>
        <param-value>false</param-value> <!-- 不支持凭证 -->
    </init-param>
    <init-param>
        <param-name>cors.preflight.maxage</param-name>
        <param-value>1800</param-value> <!-- 预检请求的缓存时间，单位为秒 -->
    </init-param>
</filter>

<filter-mapping>
    <filter-name>CorsFilter</filter-name>
    <url-pattern>/*</url-pattern> <!-- 作用于所有请求 -->
</filter-mapping>

我是直接在最后面添加

重启tomcat服务即可