Date Conversion in Struts2 [closed]

问题:

I am wondering how to convert a String to Date in Struts2. I have a simple form in which user provide the date in this format "yyyy-MM-dd". Upon submit the Sturts2 maps form that to the bean. I got error in date conversion. I Google it a lot and every where it is stated that we have to use custom type converter for this. I don't want to write a custom type converter for date conversion. I think there should be an easy mechanism in Struts2 for data conversion because data conversion is very common functionality.

JSP

<s:form action="AddDomain">
    <s:push value="idp">
        <s:textfield name="domainName"         label="Domain Name" />
        <s:textfield name="url"                label="Domain URL" />
        <s:textfield name="noOfLicense"        label="License Purchased" />

        <s:textfield name="licenseExpireDate"  label="License Expire Date" 
                                               title="YYYY-MM-DD like 2013-01-21" />

        <s:textfield name="userActiveDuration" label="Active User Duration"
                                               title="please mention in days" />

        <s:textarea  name="notes"              label="Note" cols="30" rows="5" ></s:textarea>

        <s:submit value="Add" />
    </s:push>
</s:form>

This is the JSP Where user enter the input.

Model Class

@Entity
@Table(name = "Domain")
public class IdentityProvider implements Serializable {

    @Id
    @Basic(optional = false)
    private String url;
    private String domainName;
    private int noOfLicense;
    private int userActiveDuration;
    private int activeUsers;
    private Date licenseExpireDate;
    private String notes;

    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private String domainIdCode;

    public IdentityProvider(String name, String url, int nol, int time,Date d,String notes) {
        this.setDomainName(name);
        this.setUrl(url);
        this.setNoOfLicense(nol);
        this.setUserActiveDuration(time);
        this.setLicenseExpireDate(d);
        this.setNotes(notes);
    }

    public IdentityProvider() {

    }

    // Getter Setter
}

Action Class

public class DomainManagementAction extends ActionSupport 
                                 implements ModelDriven<IdentityProvider> {

    private IdentityProvider idp = new IdentityProvider();

    public IdentityProvider getIdp() {
        return idp;
    }

    public void setIdp(IdentityProvider idp) {
        this.idp = idp;
    }

    public String saveDomain() {
        IDPBroker broker = new IDPBroker();
        broker.saveDomain(idp);
        return ActionSupport.SUCCESS;
    }


    @Override
    public IdentityProvider getModel() {
        // TODO Auto-generated method stub
        return idp;
    }

}

回答1:

Struts2 Type Conversion

Built in Type Conversion Support

Type Conversion is implemented by XWork.

XWork will automatically handle the most common type conversion for you. This includes support for converting to and from Strings for each of the following:

String
boolean / Boolean
char / Character
int / Integer, float / Float, long / Long, double / Double
dates - uses the SHORT format for the Locale associated with the current request
arrays - assuming the individual strings can be coverted to the individual items
collections - if not object type can be determined, it is assumed to be a String and a new ArrayList is created

SHORT format in JAVA:

Style     U.S. Locale   French Locale

SHORT       6/30/09       30/06/09

This means that it already works, but in SHORT format only, and it is not configurable. Try it.

Then you can alter the value clientside with some javascript hack before sending it, or copy and paste this small converter, or use a jQuery datetimepicker (recommended), and your only problem will be which theme is the coolest :)

---

EDIT

After some crypto comment, I've tried and obviously it's like the documentations states.

• If your Locale is (eg.) en_US, you need to send a String data in the format MM/dd/yy.
• If your Locale is (eg.) it_IT, you need to send a String data in the format dd/MM/yy.
• If you input dd/MM/yy with en_US Locale, you will get validation error and INPUT result.
• If you try using - instead of /, it will fail the same.
• If you input a date in another format, eg. dd/MM/yyyy (different from SHORT but right for your Locale), your date will be correctly set the same.
• If you read your Action date in the JSP without formatting it, it will be always displayed in SHORT.

Then, as said above, if you need to let the user input the date manually, tell the user to respect the right format for your Locale (eg.

<label>Input a date (dd/mm/yyyy):</label> 
<s:textfield name="aDate" />
<s:fielderror fieldName="aDate" />

Or alter it through javascript after inserted, or use a custom converter.