格式化後臺傳到頁面的JSON中的日期對象

1.implement interface

/**
 * 轉換JSON對象之前組要對BEAN裡面的日期格式進行處理
 * @author F1637884
 * @version 1.0, Jun 3, 2009 
 * @since JDK1.6
 */
public class JsonValueProcessorImpl implements JsonValueProcessor {
 private String format = "yyyy-MM-dd hh:mm:ss";

 public JsonValueProcessorImpl() {
 }
 public JsonValueProcessorImpl(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.toString();
 }

 public String getFormat() {
  return format;
 }

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

 

2.new an instance

//轉換JSON數據格式 
 JsonConfig cfg=new JsonConfig();

//過濾某些Bean的屬性，使其不進行級聯的查詢

config.setJsonPropertyFilter(new PropertyFilter(){
  public boolean apply(Object source, String name, Object value) {
   if(name.equals("hrAttendanceStatus") || name.equals("hrScheduleInfo")|| name.equals("commEmployeeInfo")) {
    return true;
   } else {
    return false;
   }
  }
 });

 

 cfg.registerJsonValueProcessor(java.util.Date.class, new JsonValueProcessorImpl());
 JSONArray jsonData = JSONArray.fromObject( attendanceList,cfg );  
 logger.info(jsonData.toString());
 //寫入輸入流
 PrintWriter writer = response.getWriter();
 writer.print(attendanceList==null?"N":jsonData.toString());
 writer.flush();
 writer.close();