Re: java.util.Date in Action Form Bean

Fri, 28 Oct 2005 06:49:13 -0700

You should be aware that when using a java.text.DateFormat class or its subclass as a static variable in a bean that can be accessed via multiple threads simultaneously, you need to synchronize access to it because DateFormat is not thread-safe. So you should change the code below to: 

   public static synchronized String date2String(Date date) {
       return sdf.format(date);
   }

or

   public static String date2String(Date date) {
        synchronized (date) {
          return sdf.format(date);
        }
   }



This is from the DateFormat Javadoc:Synchronization
Date formats are not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally. 

Regards,

Richard

Murray Collingwood wrote:
Hi I add additional getters and setters for handling dates and prices (and other special numeric formats). For example, in addition to the normal getter I code an additional one to retrieve the date as a string. 

    public Date getDateStart() {
        return dateStart;
    }
    public String getDateStartAsString() {
        if (dateStart == null) return "";
        return Focus.date2String(dateStart);
    }
I then code up some static methods to format dates to strings and similar methods to make the opposite translation (string back to date). For example, a method from my Focus class related to the above code: 

    public static String date2String(Date date) {
        return sdf.format(date);
    }

And if you're desparate, here is the sdf definition:

    private static SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
You can do the same thing with a Timestamp, depends how many fields you want to declare on your form and how much data entry you want your user to do. I used a similar method in my Focus class to get/set the date portion of the timestamp value: 

    public static String timestamp2String(Timestamp ts) {
        if (ts == null) return "";
        return date2String(new Date(ts.getTime()));
    }

HTH
mc


On 28 Oct 2005 at 14:31, Yujun Liang wrote:


Hello,
I am working on a project using Struts. Struts uses BeanUtil to populate Action Form
Bean. This is such a nice framework to work with, except,
BeanUtil doesn't support java.util.Date conversion. But when I use
java.sql.Timestamp, it asks for the format of 
yyyy-mm-dd hh:mm:ss.fffffffff

Here is the exception when I enter other format,

    Caused by: java.lang.IllegalArgumentException: Timestamp format must be 
yyyy-

mm-dd hh:mm:ss.fffffffff
In a web application, it is not reasonable to ask user to input yyyy-mm-dd 
hh:mm:ss.fffffffff.

Also, it doesn't support Locale.
Do you have experience getting java.util.Date populated in a Java Bean inside a 
FormBean?

Thanks in advance.

Regards
Yujun Liang
[EMAIL PROTECTED]
(0408) 467 448

1. Form Bean Definition,
<form-bean name="myForm" type="org.apache.struts.validator.DynaValidatorForm">

<form-property name="mybean" type="com.mycompany.myproject.bean.MyBean"/>

</form-bean>

2. Java Bean,

package com.mycompany.myproject.bean;

import java.io.Serializable;

import java.sql.Timestamp;

import org.apache.commons.lang.builder.EqualsBuilder;

import org.apache.commons.lang.builder.HashCodeBuilder;

import org.apache.commons.lang.builder.ToStringBuilder;

public abstract class MyBean implements Serializable {

    private long interchangeId;

    private Timestamp creationTime;

    private String originatingChannel;

    public long getInterchangeId() {

        return this.interchangeId;

    }

    public void setInterchangeId(long interchangeId) {

        this.interchangeId = interchangeId;

    }

    public Timestamp getCreationTime() {

        return this.creationTime;

    }


    public void setCreationTime(Timestamp creationTime) {

        this.creationTime = creationTime;

    }


    public String getOriginatingChannel() {

        return this.originatingChannel;

    }

    public void setOriginatingChannel(String originatingChannel) {

        this.originatingChannel = originatingChannel;

    }

}

3. HTML Form
<input name="mybean.creationTime" type="text" size="30" maxlength="30" 
value="25/10/2005">
<input name="mybean.originatingChannel" type="text" size="40" maxlength="40" 
value="originating channel1">
<input name="mybean.originatingChannelUserId" type="text" size="60" 
maxlength="60" value="originating_channel_userid1">

4. Exception.

[28/10/05 14:05:42:623 EST] 3f64a3f WebGroup E SRVE0026E: [Servlet Error]-
[BeanUtils.populate]: org.apache.commons.beanutils.ConversionException: Timestamp format must be yyyy-mm-dd hh:mm:ss.fffffffff
at 
org.apache.commons.beanutils.converters.SqlTimestampConverter.convert(SqlTimesta
mpConverter.java:117)
at 
org.apache.commons.beanutils.ConvertUtilsBean.convert(ConvertUtilsBean.java:428)
at 
org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:1004)

at org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811)

at org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298)

at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493)
at 
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:80
5)

at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203)

at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)

at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at 
com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.
java:110)
at 
com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.j
ava:174)
at 
com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:3
13)
at 
com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.ja
va:116)
at 
com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at 
com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletRef
erenceState.java:42)
at 
com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceR
eference.java:40)



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[EMAIL PROTECTED]
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