准备后无法理解为什么未调用register方法的原因.始终调用customeraction-validation.xml [英] Not able to understand the why register method is not being called after prepare. always customeraction-validation.xml is being called
问题描述
我正在struts2中开发一个示例Web应用程序.但是我有一些奇怪的行为
I am developing a sample web application in struts2. But i am getting some weird behaviour
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，它会准备方法而不是注册方法.不仅如此，如果我删除了customerAction-validation.xml，那么它将使用注册方法，但是没有任何内容保存在数据库中.
When i am running the code its going to prepare method but not to register method. Not only that if i remove customerAction-validation.xml then its going to register method but nothing is saved in db.
准备方法被调用两次.我不明白如何调用注册方法，并且保存了客户详细信息.
Prepare method is called twice. I am not understanding how to call the register method and customer details get saved.
推荐答案
在prepare()中，您检查model;
model将由 Params拦截器设置( ModelDriven拦截器也应参与其中，不确定如何操作，因为我从未使用过 ModelDriven >)，其运行时间晚于准备拦截器，如您在defaultStack定义中所见；
model will be set by Params Interceptor (ModelDriven Interceptor should be involved too, not sure how because I've never used ModelDriven), that runs later than Prepare Interceptor, as you can see in your defaultStack definition;
您需要使用名为 paramsPrepareParamsStack 的堆栈，该堆栈包括 Params Interceptor 的两倍， Prepare Interceptor 之前和之后的一个，允许prepare()方法与来自页面的参数(是否为 model )一起使用.
You need to use a stack named paramsPrepareParamsStack, that includes two times the Params Interceptor, one before and one after the Prepare Interceptor, for letting the prepare() method to work with parameters (model or not) coming from the page.
http://struts.apache.org/release/2.3. x/docs/interceptors.html
paramsPrepareParams 技巧的示例.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: 参数拦截器.
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.
当您希望直接应用参数时，这很有用 到要从外部加载的对象(例如DAO) 或数据库或服务层)，但无法加载该对象 直到至少已加载ID参数.通过加载 参数两次，您可以在 prepare()方法，允许第二个参数拦截器执行 将值应用于对象.
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.
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