雄猫CORS过滤器

cors web-applications java tomcat

2022-09-01 09:20:31

我想启用tomcat CORS过滤器，我将其添加到web.xml：

<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>

但它不起作用。我尝试使用自定义过滤器：

<filter>
    <filter-name>SimpleCORSFilter</filter-name>
    <filter-class>com.common.SimpleCORSFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>SimpleCORSFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

使用此类：

public class SimpleCORSFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
        chain.doFilter(req, res);
    }
}

这个井很有效，你能告诉我为什么吗？我不知道这是否重要，但我是usign Spring Framework。

答案 1

filter org.apache.catalina.filters.CorsFilter 首先在请求中查找标头：。如果此标头不存在，则筛选器不会在响应中添加任何标头。也许由于这个原因不起作用。Origin

此外，在请求中，查找标头。其他方法也会发生类似情况。您可能想查看此过滤器的代码。换句话说，有一个流程图：POSTContent-Type

CORS Flow Chart

答案 2

我遇到了类似的问题，我发现在tomcat doc tomcat-doc-CORSFilter上对我有用的东西，我使用过滤器和初始化参数，如下所示：

<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>
  </init-param>
  <init-param>
    <param-name>cors.allowed.methods</param-name>
    <param-value>GET,POST,HEAD,OPTIONS,PUT</param-value>
  </init-param>
  <init-param>
    <param-name>cors.allowed.headers</param-name>
    <param-value>Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value>
  </init-param>
  <init-param>
    <param-name>cors.exposed.headers</param-name>
    <param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value>
  </init-param>
  <init-param>
    <param-name>cors.support.credentials</param-name>
    <param-value>true</param-value>
  </init-param>
  <init-param>
    <param-name>cors.preflight.maxage</param-name>
    <param-value>10</param-value>
  </init-param>
</filter>
<filter-mapping>
  <filter-name>CorsFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

希望它有帮助！