Java JSON时间格式化

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import java.text.SimpleDateFormat;       
import java.util.Date;       

import net.sf.json.JsonConfig;       
import net.sf.json.processors.JsonValueProcessor;       

public class JsonDateValueProcessor implements JsonValueProcessor {          

    private String format = "yyyy-MM-dd HH:mm:ss";          

    public JsonDateValueProcessor() {          

    }          

    public JsonDateValueProcessor(String format) {          
        this.format = format;          
    }          

    public Object processArrayValue(Object value, JsonConfig jsonConfig) {          
        String[] obj = {};          
        if (value instanceof Date[]) {          
            SimpleDateFormat sf = new SimpleDateFormat(format);          
            Date[] dates = (Date[]) value;          
            obj = new String[dates.length];          
            for (int i = 0; i < dates.length; i++) {          
                obj[i] = sf.format(dates[i]);          
            }          
        }          
        return obj;          
    }          

    public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {          
        if (value instanceof Date) {          
            String str = new SimpleDateFormat(format).format((Date) value);          
            return str;          
        }          
        return value == null ? null : value.toString();          
    }          

    public String getFormat() {          
        return format;          
    }          

    public void setFormat(String format) {          
        this.format = format;          
    }          

}