無法理解註冊方法在準備後未被調用的原因。總是customeraction-validation.xml被稱爲

Question

我正在struts2中開發一個示例web應用程序。但我得到一些怪異的行爲

CustomerAction.java：

package com.astro.action; 


import java.io.Serializable; 
import java.util.ArrayList; 
import java.util.Date; 
import java.util.List; 
import java.util.Map; 
import javax.servlet.http.*; 
import javax.servlet.*; 
import com.astro.model.*; 

import org.apache.struts2.interceptor.SessionAware; 
import org.apache.struts2.interceptor.validation.SkipValidation; 

//import org.hibernate.classic.Validatable; 

import com.astro.base.framework.AstroSystemException; 
import com.astro.bo.CustomerBo; 
import com.astro.model.Customer; 
import com.opensymphony.xwork2.ActionContext; 
import com.opensymphony.xwork2.ActionSupport; 
import com.opensymphony.xwork2.ModelDriven; 
import com.opensymphony.xwork2.Preparable; 
import com.opensymphony.xwork2.Validateable; 

public class CustomerAction extends ActionSupport implements Serializable,SessionAware,Preparable, ModelDriven<CustomerPageInfo>{ 
    private static final long serialVersionUID = 2335707118972931221L; 

    private Map<String,Object> session; 
    String target = ""; 
    //DI via Spring 

    private CustomerPageInfo model; 
    private CustomerBo customerBo; 
    private Customer customer=new Customer(); 
    public CustomerBo getCustomerBo() { 
     return customerBo; 
    } 
    public void setCustomerBo(CustomerBo customerBo) { 
     this.customerBo = customerBo; 
    } 

    public String errorDisplay() 
    { 
     return "input"; 
    } 
    //Register a Customer 
      public String register() throws Exception{ 
       System.out.println("I am in register method of CustomerAction.java"); 
       System.out.println("((())))"+model.getCountryList().toString()); 
       System.out.println("((())))"+model.getCustomerInfo()); 
       model.getCustomerInfo().setCreatedDate(new Date()); 
       customerBo.register(customer); 
       return SUCCESS; 
       } 

    public void prepare() throws Exception { 
     if(model==null) 
     { 
      model=new CustomerPageInfo(); 
      System.out.println("In prepare method"); 
      if(model.getCountryList()==null) 
      { 
       List<NameValuePair> countryList=customerBo.getAllCountries(); 
       model.setCountryList(countryList); 
      } 
      System.out.println("Before initializing"+model.getCustomerInfo()); 
      if(model.getCustomerInfo()==null) 
      { 
       model.setCustomerInfo(customer); 
      } 
      System.out.println("After initializing"+model.getCustomerInfo()); 
     } 

    } 

    @Override 
    public void setSession(Map<String, Object> map) { 
     this.session=map; 
    } 

    /*public void validate() 
    { 
     try { 
      if(customerBo.doesCustomerExists(customer)==true) 
      { 
       addActionError("Customer Alreay Exists"); 
      } 
      else 
      { 
       addActionMessage(INPUT); 
      } 
     } catch (AstroSystemException e) { 
      e.printStackTrace(); 
     } 

    } 
*/ 
    public void setModel(CustomerPageInfo model) 
    { 

    this.model=model; 
    } 

    public CustomerPageInfo getModel() 
    { 
     return model; 
    } 
} 

struts.xml中：

<?xml version="1.0" encoding="UTF-8" ?> 
<!DOCTYPE struts PUBLIC 
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" 
"http://struts.apache.org/dtds/struts-2.0.dtd"> 

<struts> 
    <constant name="struts.devMode" value="true" /> 
    <constant name="struts.configuration.xml.reload" value="true" /> 
    <constant name="struts.action.extension" value="do" /> 
    <constant name="struts.objectFactory" value="spring" /> 
    <constant name="struts.custom.i18n.resources" value="ApplicationResources" /> 
    <!-- <constant name="struts.freemarker.mru.max.strong.size" value="250" /> --> 
    <constant name="struts.freemarker.templatesCache.updateDelay" 
     value="60000" /> 
    <constant name="struts.enable.DynamicMethodInvocation" value="true" /> 

    <package name="astro" extends="struts-default" namespace="/"> 

     <!-- Different types of result types --> 
     <result-types> 
      <result-type name="tiles" class="org.apache.struts2.views.tiles.TilesResult" /> 
     </result-types> 

     <interceptors> 
       <interceptor-stack name="defaultStack"> 
       <interceptor-ref name="exception"/> 
       <interceptor-ref name="alias"/> 
       <interceptor-ref name="servletConfig"/> 
       <interceptor-ref name="prepare"/> 
       <interceptor-ref name="chain"/> 
       <interceptor-ref name="debugging"/> 
       <interceptor-ref name="modelDriven"/> 
       <interceptor-ref name="checkbox"/> 
       <interceptor-ref name="multiselect"/> 
       <interceptor-ref name="actionMappingParams"/> 
       <interceptor-ref name="params"> 
        <param name="excludeParams">dojo\..*,^struts\..*</param> 
       </interceptor-ref> 
       <interceptor-ref name="conversionError"/> 
       <interceptor-ref name="validation"> 
        <param name="excludeMethods">input,back,cancel,browse</param> 
       </interceptor-ref> 
       <interceptor-ref name="workflow"> 
        <param name="excludeMethods">input,back,cancel,browse</param> 
       </interceptor-ref> 
      </interceptor-stack> 

     </interceptors> 
     <action name="registerCustomer" class="customerAction" method="register"> 
      <interceptor-ref name="defaultStack"/> 
      <result name="success" type="redirectAction"> 
       <param name="actionName">successInformation</param> 
      </result> 
      <result name="input" type="tiles">/registration.tiles</result> 
     </action> 

     <action name="successInformation" class="com.astro.action.DisplayAction" 
      method="display"> 
      <interceptor-ref name="defaultStack"/> 
      <result name="success" type="tiles">/regSuccess.tiles</result> 
     </action> 

     <action name="loginCustomer" class="loginAction" method="login"> 
      <result name="success" type="tiles">/loginSuccess.tiles</result> 
      <result name="input" type="tiles">/loginForm.tiles</result> 
     </action> 

     <action name="loginCustomer1" class="loginAction" method="logout"> 
      <result name="success" type="tiles">/loginForm.tiles</result> 
      <result name="input" type="tiles">/loginForm.tiles</result> 
     </action> 

     <action name="login" class="com.astro.action.DisplayAction1" 
      method="display"> 
      <result name="success" type="tiles">/loginForm.tiles</result> 
     </action> 
     <action name="feedback" class="com.astro.action.DisplayAction1" 
      method="display1"> 
      <result name="success" type="tiles">/contact.tiles</result> 
      <result name="input" type="tiles">/contact.tiles</result> 
     </action> 
     <action name="contactus" class="contactAction" method="contact"> 
      <result name="success" type="tiles">/contactus.tiles</result> 
      <result name="input" type="tiles">/contactsuccess.tiles 
      </result> 
     </action> 
    </package> 

</struts> 

customer.jsp：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
    pageEncoding="ISO-8859-1"%> 
<%@page session="false"%> 
<%@ taglib prefix="s" uri="/struts-tags"%> 
<style type="text/css"> 
@import url(css/main.css); 
</style> 
<style> 
.errorMessage { 
    color: red; 
} 
.errors { 
    background-color:#FFCCCC; 
    border:1px solid #CC0000; 
    width:400px; 
    margin-bottom:8px; 
    font: message-box; 
} 
.errors li{ 
    list-style: none; 
    } 
</style> 
<style type="text/css"> 
.errorsBg{ 
    background-color:; 
    color:black;  
    border: 0px solid; 
} 

.errorMessage{ 
    padding:4px 8px; 
} 

table{ 
    border-spacing: 8px; 
} 
td{ 
    padding:5px; 
} 
</style> 
<script> 
/* $(document).ready(function(){ 
    $("input").keydown(function(){ 
    $("input").css("background-color","yellow"); 
    }); 
    $("input").keyup(function(){ 
    $("input").css("background-color","pink"); 
    }); 
}); */ 
</script> 
</head> 

<html> 
<head> 
</head> 
<body bgcolor="green"> 
    <!-- <h1>Welcome to Astro vedic</h1> 
    <h2>Register a Customer</h2> --> 
    <div class="errors" style="width: 500px"> 
    <s:token></s:token> 
    </div> 
<s:if test="hasActionErrors()"> 
    <div class="errors"> 
     <s:actionerror/> 
    </div> 
</s:if> 
<s:form action="registerCustomer.do" focusElement="focus" method="post" validate="true" namespace="/"> 
<s:actionerror /> 
      <s:textfield id="focus" name="name" key="name" size="20" /> 
      <s:password name="password" label="Password "/> 
      <s:password name="confirmPassword" label="Re-enter Password "/> 
      <s:textfield name="email" key="email" size="20" required="true" /> 
      <s:textfield name="telephone" key="telephone" size="20"></s:textfield> 
      <s:select required="true" name="countryCode" label="CountryName" listValue="name" headerKey="" headerValue="Choose One" 
      list="countryList" listKey="value"/> 
      <s:submit align="center" key="addCustomer"/> 

     </s:form> 
    </div> 
</body> 
</html> 

當我運行代碼時，它將準備方法但不註冊方法。不僅如果我刪除customerAction-validation.xml，然後它將註冊方法，但沒有保存在數據庫中。

準備方法被調用兩次。我不知道如何調用註冊方法，並保存了客戶詳細信息。

Answer 1

在prepare()您檢查model;

model將PARAMS攔截設置（模型驅動攔截也應該被捲入，不知道如何，因爲我從來沒有用過模型驅動），晚於運行準備攔截，你可以看到在你的defaultStack定義中;

你需要使用一個名爲paramsPrepareParamsStack堆棧，包括兩次PARAMS攔截，一前一的後準備攔截，爲讓prepare()方法與參數（模型工作或不）來自頁面。

http://struts.apache.org/release/2.3.x/docs/interceptors.html

的paramsPrepareParams特技的一個例子。該堆棧 與defaultStack完全相同，只是它在準備攔截器之前包含一個額外的攔截器： params攔截器。

當你希望直接 參數適用於要加載的外部（例如，DAO 或數據庫或服務層）的對象這是有用的，但不能加載該對象 直到至少ID參數已被加載。通過加載 這個參數兩次，你可以檢索到對象在prepare（）方法中的 ，允許第二個params攔截器到 應用這個對象的值。