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

Question

我正在使用 struts2 开发一个示例 Web 应用程序。但我遇到了一些奇怪的行为

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:

<?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，但不会注册方法。不仅如此，如果我删除 customerAction-validation.xml 那么它会注册方法，但数据库中不会保存任何内容。

Prepare 方法被调用两次。我不明白如何调用注册方法和保存客户详细信息。

Answer 1

在prepare()中检查model；

model 将由 ParamsInterceptor 设置(ModelDrivenInterceptor 也应该参与其中，不知道如何，因为我从未使用过ModelDriven)，它的运行晚于 Prepare Interceptor，如您在 defaultStack 定义中所见；

您需要使用一个名为paramsPrepareParamsStack的堆栈，其中包含两次Params Interceptor，一个在Prepare Interceptor之前，一个在Prepare Interceptor之后，让 prepare() 方法使用来自页面的参数(模型或不)。

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

An example of the paramsPrepareParams trick. This stack is exactly the same as the defaultStack, except that it includes one extra interceptor before the prepare interceptor: the params interceptor.

This is useful for when you wish to apply parameters directly to an object that you wish to load externally (such as a DAO or database or service layer), but can't load that object until at least the ID parameter has been loaded. By loading the parameters twice, you can retrieve the object in the prepare() method, allowing the second params interceptor to apply the values on the object.