How to solve struts2 date type conversion

Therefore, in order to ensure that the system must correctly cast the Date type, it is necessary to write a global type casting class to cast between Date and String.

package com.great.util;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;
import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;
public class DateConverter extends DefaultTypeConverter {
    private static final DateFormat[] ACCEPT_DATE_FORMATS = {
            new SimpleDateFormat("dd/MM/yyyy"),
            new SimpleDateFormat("yyyy-MM-dd"),
            new SimpleDateFormat("yyyy/MM/dd") }; //Supports converted date formats
    @Override 
    public Object convertValue(Map context, Object value, Class toType) { 
        if (toType == Date.class) {  //String to Date is converted when the browser submits to the server
            Date date = null; 
            String dateString = null; 
            String[] params = (String[])value; 
            dateString = params[0];//Gets a string of dates
            for (DateFormat format : ACCEPT_DATE_FORMATS) { 
                try { 
                    return format.parse(dateString);//Traversing the date supports formatting for conversion
                } catch(Exception e) { 
                    continue; 
                } 
            } 
            return null; 
        } 
        else if (toType == String.class) {   //When the server outputs to the browser, it casts Date to String
            Date date = (Date)value; 
            return new SimpleDateFormat("yyyy-MM-dd").format(date);//The output format is yyyy-mm-dd
        } 

        return null; 
    }
}

Create the xwork-conversion. Properties file in the root directory and add the following statement to register the type converter
Java. Util. Date = com. Great. Util. DateConverter
The com. Great. Util. DateConverter is date conversion class contains the full name of the namespace.
 

          And then a lot of people are done.

          And I haven't succeeded yet, the system reports an error

          "ERROR (commonslogger.java :27) - Conversion registration ERROR"

          "Java. Lang. ClassNotFoundException: com. Great. Util. DateConverter"

          Failed to register type converter?

          A closer inspection found "Java. Util. Date = com. Great. Util. DateConverter" more behind a space! The truth is out. Remove the space, run again, success!