MVC design Process (rough) practice

The following is a brief description of several core classes
Database Connection Controller

 Public classConnectionManager {Private StaticThreadlocal<connection> Connectionholder =NewThreadlocal<connection>(); //gets a copy of the current local thread local variable---Get the connection     Public StaticConnection getconnection () {Connection conn=Connectionholder.get (); if(conn = =NULL) {Conn=Newdbutil (). Getconn ();        Connectionholder.set (conn); }        returnConn; }    /*** Close Database connection*/     Public Static voidCloseConnection () {Connection conn=Connectionholder.get (); if(Conn! =NULL) {            Try{conn.close ();            Connectionholder.remove (); } Catch(SQLException e) {e.printstacktrace (); }        }    }    /*** Open Transaction manually * *@paramConn*/     Public Static voidBeginTransaction (Connection conn) {Try {            if(Conn! =NULL) {                if(Conn.getautocommit ()) {Conn.setautocommit (false); }            }        } Catch(SQLException e) {e.printstacktrace (); }    }    /*** SET TRANSACTION submission * *@paramConn*/     Public Static voidCommitTransaction (Connection conn) {Try {            if(Conn! =NULL) {                if(!Conn.getautocommit ())                {Conn.commit (); }            }        } Catch(Exception e) {e.printstacktrace (); }    }    /*** SET TRANSACTION rollback * *@paramConn*/     Public Static voidRollbackTransaction (Connection conn) {Try {            if(Conn! =NULL) {                if(!Conn.getautocommit ())                {Conn.rollback (); }            }        } Catch(Exception e) {e.printstacktrace (); }    }    /*** Restore the original transaction commit * *@paramConn*/     Public Static voidrecovertransaction (Connection conn) {Try {            if(Conn! =NULL) {                if(Conn.getautocommit ()) {Conn.setautocommit (false); } Else{conn.setautocommit (true); }            }        } Catch(Exception e) {e.printstacktrace (); }    }}

 Public Abstract class Abstractdao {    protectednull;     protected NULL ;      Public Abstractdao () {        this. conn = connectionmanager.getconnection ();    }} 

Data Access Layer Factory: Daofactory

 Public class daofactory {    publicstaticthrows  Exception {        = Resourceutil.getresourcebundle ("Database", "Db.name");         = Resourceutil.getresourcebundle (baseName,                "Member.class");         return (Imemberdao) class.forname (className). newinstance ();    

Business layer proxy class: Serviceproxy

 Public classServiceproxyImplementsInvocationhandler, Serializable {PrivateObject obj;//Real Themes     Publicobject bind (Object obj) { This. obj = obj;//implementation of the Memberserviceimpl        returnproxy.newproxyinstance (Obj.getclass (). getClassLoader (), obj. GetClass (). Getinterfaces (), This); } @Override Publicobject Invoke (Object proxy, Method method, object[] args)throwsthrowable {Object value=NULL; //Initialize validation of database connections when binding objects        if(Method.getname (). Contains ("Login")                || Method.getname (). Contains ("Add")                || Method.getname (). Contains ("Edit")                || Method.getname (). Contains ("rm")) {//If the update operation is nowConnection conn =connectionmanager.getconnection (); Try{connectionmanager.begintransaction (conn); Value= Method.invoke ( This. obj, args);            Connectionmanager.committransaction (conn); } Catch(Exception e) {connectionmanager.rollbacktransaction (conn); } finally{connectionmanager.recovertransaction (conn);            Connectionmanager.closeconnection (); }        } Else {            Try{Value= Method.invoke ( This. obj, args); }Catch(Exception e) {Throwe; } finally{connectionmanager.closeconnection (); }        }        returnvalue; }}

Business Layer Factory class:servicefactory

 Public class servicefactory {    publicstatic  imemberservice getimemberserviceinstance () {         returnnew  serviceproxy ()                . bind (new  Memberserviceimpl ());}    } 

MVC design Process (rough) practice