JSF Custom Converters | 易学教程

问题

I have a custom converter like this:

@Override
public Object getAsObject(FacesContext facesContext, UIComponent component, String str) {
    System.out.println("vadeConverter before getAsObject(" + str);
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-mm-dd");

    String values[] = str.split(":");
    Vade vade = new Vade();
    if (values.length > 1) {
        vade.setId(Integer.parseInt(values[0]));
        vade.setEtiket(values[1]);
        try{
            vade.setTakasTarihi(dateFormat.parse(values[2]));
        }catch (Exception e){
            e.printStackTrace();
        }           
    }
    System.out.println("vadeConverter after getAsObject(" + vade.toString());
    return vade;
}

@Override
public String getAsString(FacesContext context, UIComponent component,
        Object object) {
    Vade vade = (Vade) object;
    String str = "";
    System.out.println("vadeConverter before getAsString(object) -> " + vade.toString());
    if (vade != null) {
        str = vade.getId().toString()+":"+
                vade.getEtiket()+":"+
                vade.getTakasTarihi().toString()
                ;
    }
    System.out.println("vadeConverter after getAsString(object) -> " + str);
    return str;
}

In the output in the console is:

vadeConverter before getAsString(object) -> Vade{id=7etiket=T+0takasTarihi=2012-02-21}
vadeConverter after getAsString(object) -> 7:T+0:2012-02-21
vadeConverter before getAsString(object) -> Vade{id=12etiket=T+2takasTarihi=2012-02-27}
vadeConverter after getAsString(object) -> 12:T+2:2012-02-27
vadeConverter before getAsString(object) -> Vade{id=13etiket=T+3takasTarihi=2012-02-28}
vadeConverter after getAsString(object) -> 13:T+3:2012-02-28
vadeConverter before getAsString(object) -> Vade{id=14etiket=T+4takasTarihi=2012-02-29}
vadeConverter after getAsString(object) -> 14:T+4:2012-02-29
vadeConverter before getAsString(object) -> Vade{id=15etiket=T+5takasTarihi=2012-03-01}
vadeConverter after getAsString(object) -> 15:T+5:2012-03-01
vadeConverter before getAsString(object) -> Vade{id=16etiket=T+6takasTarihi=2012-03-02}
vadeConverter after getAsString(object) -> 16:T+6:2012-03-02
vadeConverter before getAsString(object) -> Vade{id=17etiket=T+7takasTarihi=2012-03-03}
vadeConverter after getAsString(object) -> 17:T+7:2012-03-03
vadeConverter before getAsString(object) -> Vade{id=18etiket=T+8takasTarihi=2012-03-04}
vadeConverter after getAsString(object) -> 18:T+8:2012-03-04
vadeConverter before getAsString(object) -> Vade{id=19etiket=T+9takasTarihi=2012-03-05}
vadeConverter after getAsString(object) -> 19:T+9:2012-03-05

when I select a value from the selectonemenu in the console I get this:

vadeConverter before getAsObject(12:T+2:2012-02-27
vadeConverter after getAsObject(Vade{id=12etiket=T+2takasTarihi=Fri Jan 27 00:02:00 EET 2012}

and of course as a result I get validation error. I believe I write the converter in right way, but I don't know what is wrong with this code..

回答1:

You're using mm instead of MM to denote months. The mm stands for minutes. Note that you're getting Jan instead of Feb and that you get 2 minutes instead of 0 minutes. You can find the formatting pattern syntax in SimpleDateFormat javadoc.

More reliable would however be to use getTime() and new Date(time) instead of toString() and SimpleDateFormat#parse(). This way you're also not dependent on the default toString() result.

来源：https://stackoverflow.com/questions/9444048/jsf-custom-converters

标签

jsf-2

converter