• addDay(Date aDate, int iDay) : Date
• addMonth(Date aDate, int iMonth) : Date
• addQuarter(Date aDate, int iQuarter) : Date
• addWeek(Date aDate, int iWeek) : Date
• addYear(Date aDate, int iYear) : Date
• getDayOfMonth(Date aDate) : int
• getDayOfWeek(Date aDate) : int
• getDayOfYear(Date aDate) : int
• getDaysBt(Date dFrom, Date dTo) : int
• getFirstDayOfMonth(Date aDate) : Date
• getFirstDayOfQuarter(Date aDate) : Date
• getFirstDayOfWeek(Date aDate) : Date
• getFirstDayOfYear(Date aDate) : Date
• getLastDayOfMonth(Date aDate) : Date
• getLastDayOfQuarter(Date aDate) : Date
• getLastDayOfWeek(Date aDate) : Date
• getLastDayOfYear(Date aDate) : Date
• getMonth(Date aDate) : int
• getQuarter(Date aDate) : int
• getYear(Date aDate) : int
• main(String[] args) : void
• trunc(Date aDate, String aFormat) : Date

公司經(jīng)常更換框架，好不容易寫好的業(yè)務(wù)模型經(jīng)常要推倒重來。
為此考慮將業(yè)務(wù)模型獨立出來，不受框架的影響。
具體考慮如下：
1.接口定義
DBConnection.java
public interface DBConnection {
? PreparedStatement prepareStatement(String aSql);
?....
? void free();
? void commit();
? void rollback();
}
DBContext.java
public interface DBContext {
? DBConnection newDBConnection();
}
2.模型實現(xiàn)
public class ActualFlow {
? DBContext dbContext=null;
? public ActualFlow() {
? }
? public void init(DBContext aContext){
??? dbContext=aContext;
? }
? public int calculate(String aBranchId,String aYear,String aMonth,String aUserId){
??? int iRtn=-1
??? PreparedStatement objState=null;
??? ResultSet objSet=null;
??? DBConnection objCon=null;
??? try {
????? objCon=dbContext.newDBConnection();
????? objState=objCon.prepareStatement("具體的sql語句");
????? //業(yè)務(wù)模型操作......

??? }
??? catch (Exception ex) {
????? ex.printStackTrace();
????? iRtn=-1;
??? }finally{
????? if (objSet!=null) {
??????? try {
????????? objSet.close();//關(guān)閉結(jié)果集合
??????? }
??????? catch (Exception ex) {
????????? ex.printStackTrace();
??????? }
????? }
????? if (objState!=null) {
??????? try {
????????? objState.close();//關(guān)閉statement
??????? }
??????? catch (Exception ex1) {
????????? ex1.printStackTrace();
??????? }
????? }
????? if (objCon!=null) {
??????? objCon.free();//釋放連接
????? }
??? }
??? return iRtn;
? }
}
3.在具體的開發(fā)框架下面
?? 定義EAPDBContext 實現(xiàn) DBContext
???如下方式復(fù)用模型：
????? ActualFlow objActualFlow=new ActualFlow();
? ??? objActualFlow.init(new EAPDBContext("actualFlow"));
????? int i=objActualFlow.calculate(this.m_branchID,this.m_year,this.m_month);

不知道是否合理，先練習練習