无法理解为什么在准备后没有调用register方法。总是调用customeraction-validation.xml

Question

我正在struts2中开发一个示例Web应用程序。但我得到一些奇怪的行为

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>

当我运行代码时，它将准备方法但不注册方法。不仅如果我删除customerAction-validation.xml然后它将注册方法，但没有任何内容保存在db。

准备方法被调用两次。我不了解如何调用注册方法并保存客户详细信息。

Answer 1

在prepare()中，您检查model;

model将由 Params拦截器设置（ ModelDriven拦截器也应该参与，不知道如何因为我从未使用 ModelDriven < / em>），运行时间晚于准备拦截器，正如您在defaultStack定义中看到的那样;

您需要使用名为 paramsPrepareParamsStack 的堆栈，其中包括 Params Interceptor 的两倍，一个在 Prepare Interceptor 之前和之后，让prepare()方法使用来自页面的参数（ model 或不是）。

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

  

paramsPrepareParams 技巧的一个示例。这个堆栈    与defaultStack完全相同，除了它    在准备拦截器之前包括一个额外的拦截器：    params拦截器。

     

当您希望直接应用参数时，这非常有用        到您希望外部加载的对象（例如DAO        或数据库或服务层），但无法加载该对象        直到至少加载了ID参数。通过加载        参数两次，你可以在中检索对象        prepare（）方法，允许第二个params拦截器        在对象上应用值。