Struts2.3.20使用token防表单重复提交：警告: Could not find token name in params.

警告: Could not find token name in params.

就是这么一个小小的错误，浪费了我好多时间，在网上看了好多帖子，都是扯淡的帖子，要么说你没放置<s:token />要么说你这个没放置到<form>中，还有就是说你拦截器顺序不对，都胡扯吧啦，没说到点子上，我在此给出解决方案：你的Action类要继承ActionSupport，否则就会出现这样的错误！

另外上一些标准的模板：

前台JSP：

<s:debug></s:debug>  <s:form action="TokenAction" method="post">   <s:textfield name="username" label="username"></s:textfield>   <s:submit label="提交"></s:submit>   <s:token />  </s:form>

注意添加：<%@ taglib prefix="s" uri="/struts-tags"%>

后台Action：

package cn.edu.shu.second.form.token; import com.opensymphony.xwork2.ActionSupport; public class TokenAction extends ActionSupport {  private String username;  public String getUsername() {   return username;  }  public void setUsername(String username) {   this.username = username;  }  public String execute() {   try {    Thread.sleep(1000);   } catch (InterruptedException e) {    e.printStackTrace();   }   System.out.println("休息了一秒咯");   return "success";  } }

还有一个Struts.xml：

<action name="TokenAction" class="cn.edu.shu.second.form.token.TokenAction">    <interceptor-ref name="token" />    <interceptor-ref name="defaultStack" />    <result name="invalid.token">error.jsp</result>    <result name="success">success.jsp</result>   </action>

注意我这个是标准配置，别听网上扯淡，什么拦截器放在result之后，什么默认拦截器放在token之前，总结一个字就是扯淡，给出证据，我们来看Struts官方文档给出的Example：

Extending the interceptor: While not very common for users to extend, this interceptor is extended by the TokenSessionStoreInterceptor. The handleInvalidToken(com.opensymphony.xwork2.ActionInvocation) andhandleValidToken(com.opensymphony.xwork2.ActionInvocation) methods are protected and available for more interesting logic, such as done with the token session interceptor. Example code: <action name="someAction" class="com.examples.SomeAction"> <interceptor-ref name="token"/> <interceptor-ref name="basicStack"/> <result name="success">good_result.ftl</result> </action> <-- In this case, myMethod of the action class will not get checked for invalidity of token --> <action name="someAction" class="com.examples.SomeAction"> <interceptor-ref name="token"> <param name="excludeMethods">myMethod</param> </interceptor-ref name="token"/> <interceptor-ref name="basicStack"/> <result name="success">good_result.ftl</result> </action>