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Struts2中用<s:token/>标签防止重复提交问题

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y猪
    24632435

    struts.xml
    <?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE struts PUBLIC

        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
    "http://struts.apache.org/dtds/struts-2.5.dtd">

    <struts>

    <package name="weiye" namespace="/test" extends="struts-default">
    <!-- name action的名字，访问时使用helloworld.action访问，class：实现类 -->
    
    <action name="weiye" class="com.weiye.PersonAction" method="execute">
    <interceptor-ref name="defaultStack"/>
    <interceptor-ref name="token"/>
    <result name="invalid.token">/index.jsp</result>
       
         <result name="success">/WEB-INF/personlist.jsp</result>
    </action>

</package>

    </struts>

    package com.weiye;

    public class PersonAction {

    private String name;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}
public String execute(){
    
    return "success";
}

    }
    index.jsp
    <%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s" %>

    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    <s:form action="weiye" namespace="/test" method="post">
    姓名：<s:textfield name="name"/><s:token></s:token>

    <input type="submit" value="发送">
    </s:form>
    </body>
    </html>

    personlist.jsp
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    <s:property value="name"/>
    <br/><%=new Date() %>
    </body>
    </html>

    异常如下：type Exception report

    message

    description The server encountered an internal error that prevented it from fulfilling this request.

    exception

    java.lang.NullPointerException

    com.opensymphony.xwork2.util.LocalizedTextUtil.findText(LocalizedTextUtil.java:692)
com.opensymphony.xwork2.util.LocalizedTextUtil.findText(LocalizedTextUtil.java:661)
com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:206)
com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:135)
org.apache.struts2.interceptor.TokenInterceptor.getErrorMessage(TokenInterceptor.java:179)
org.apache.struts2.interceptor.TokenInterceptor.handleInvalidToken(TokenInterceptor.java:163)
org.apache.struts2.interceptor.TokenInterceptor.handleToken(TokenInterceptor.java:148)
org.apache.struts2.interceptor.TokenInterceptor.doIntercept(TokenInterceptor.java:139)
    struts2
    阅读 3.4k
    1 个回答
    得票最新
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    lpgad
      80411331

      <s:token />标签防止重复提交，用法如下：
      第一步：在表单中加入<s:token />
      <s:form action="helloworld_other" method="post" namespace="/test">
      <s:textfield name="person.name"/><s:token/><s:submit/>
      </s:form>
      第二步：
      <action name="helloworld_*" class="cn.itcast.action.HelloWorldAction" method="{1}">

           <interceptor-ref name="defaultStack"/>
      <!-- 增加令牌拦截器 -->
      <interceptor-ref name="token">
              <!-- 哪些方法被令牌拦截器拦截 -->
              <param name=“includeMethods">save</param>
      </interceptor-ref>    
     <!-- 当表单重复提交转向的页面 -->
    <result name="invalid.token">/WEB-INF/page/message.jsp</result>

      </action>
      以上配置加入了“token”拦截器和“invalid.token”结果，因为“token”拦截器在会话的token与请求的token不一致时，将会直接返回“invalid.token”结果。