Java/j2Ee Discussions

[chandra916]

Linux and Windows...... We have a slave device....Printer,biometric,SMart card.....So we have a protocol for every module.....We can develop in any language and any platform....So baga scope vundi Java and Android lo try cheyadaniki....Anduke daily intlone learning about Java and Android

[fake_Bezawada]

[quote name='Salividi' timestamp='1371107378' post='1303852349']
Linux and Windows...... We have a slave device....Printer,biometric,SMart card.....So we have a protocol for every module.....We can develop in any language and any platform....So baga scope vundi Java and Android lo try cheyadaniki....Anduke daily intlone learning about Java and Android
[/quote]
ok macha bangalore or hyd nuvvu ?

[cherlapalli_jailer]

[quote name='remo_401' timestamp='1371096620' post='1303852012']
java webservices restful konchem daani gurinchi cheputaara

jersey client ante enti

what does it do

jersey enduku use chestam
[/quote]
simple plain language lo chappli ant

jersey is servlet package..

most of the stuff will be handled by jersey servelt for us

mana Aa jar files ni class paath lo pettukoni

write ur own restful service using the 4 common methods

RESTFUl makes life of a developer easy and it is easy to implement

[innovative]

[quote name='cherlapalli_jailer' timestamp='1370948990' post='1303845307']
sure
when u r free we can discuss
[/quote]

Thanx

1) Typical Spring project lo folder structure enti ...

[cherlapalli_jailer]

[quote name='innovative' timestamp='1371168490' post='1303854850']

Thanx

1) Typical Spring project lo folder structure enti ...
[/quote]


Simple ga cheppali ante..

2 parts


1) Web part
2) Back End

root path will be WEBCONTENT (most of the time index.jsp will be sitting here)

under WebContent
1) Web part:- WEB-INF (Normally this will have WEB.XML and other XMLS)
classes
jsp
--each module will have its owns dir - sub dir for easy maintenance
lib
customTags

2)say Resources
-Images
-JS
--CSS
--HTML
( Typically this resource folder can/will go to Web Server also) that it will load faster..bu

3)META-INF


back end

SRC dir

ur own package and main packages will be

1) Controllers
2)Foms
3)DAO(if hibernate then pojo)
4)util
and for business logic

jar the classes and drop it to WEB-INF lib

and war it deploy in ur app server

This is simple and normally every company follow its own style and frame work....

so to work @ home this works better...

[innovative]

[quote name='cherlapalli_jailer' timestamp='1371218977' post='1303856250']


Simple ga cheppali ante..

2 parts


1) Web part
2) Back End

root path will be WEBCONTENT (most of the time index.jsp will be sitting here)

under WebContent
1) Web part:- WEB-INF (Normally this will have WEB.XML and other XMLS)
classes
jsp
--each module will have its owns dir - sub dir for easy maintenance
lib
customTags

2)say Resources
-Images
-JS
--CSS
--HTML
( Typically this resource folder can/will go to Web Server also) that it will load faster..bu

3)META-INF


back end

SRC dir

ur own package and main packages will be

1) Controllers
2)Foms
3)DAO(if hibernate then pojo)
4)util
[b]and for business logic[/b]

jar the classes and drop it to WEB-INF lib

and war it deploy in ur app server

This is simple and normally every company follow its own style and frame work....

so to work @ home this works better...
[/quote]

tq .. Excellent post Jailer

smal doubt ... business logic(bold) antene controller classes, DAO ave kada malli business logic enti ..
and also through some light on DAO.

[Water]

[quote name='innovative' timestamp='1371410308' post='1303861105']

tq .. Excellent post Jailer

smal doubt ... business logic(bold) antene controller classes, DAO ave kada malli business logic enti ..
and also through some light on DAO.
[/quote]
Hi.. you are doing a great job keeping this thread alive...

[chandra916]

Interface ante enti? Didnt understand the discription in docs.oracle.
Started learning java....

[coca-cola]

[quote name='Salividi' timestamp='1371535672' post='1303865695']
Interface ante enti? Didnt understand the discription in docs.oracle.
Started learning java....
[/quote]
interface nothing but set of abstract methods..................................................like A extends B in normal classes.........but to inherit from interface A implements interface name.................

for classes extends keyword ..................
for interface implments........................

[cherlapalli_jailer]

[quote name='innovative' timestamp='1371410308' post='1303861105']

tq .. Excellent post Jailer

smal doubt ... business logic(bold) antene controller classes, DAO ave kada malli business logic enti ..
and also through some light on DAO.
[/quote]

Controller class lo bussiness logic pettakoodadu

this is how typical controller class look like

//requestObject. , session will be IN params
based on the request .
we need to invoke the the business logic

then once the business logic is done
we need to construct to out param or data or model or list ..based on the requirment

like
public ViewModel LoginController((HttpServletRequest req,
@ModelAttributexxx xxx,
BindingResult result,SessionObject..)
{
// call ur bussinesLayer
AuthenticateMrg aumgr = new AuthenticateMrg() ;

Authenticate au = new Authenticate() ;
au = aumgr.checkLogin(xxx,req)
if(au.login()){
au.getHomepageDetails(xxx) ;//this will have all the logic ..like what r all the accounts ...payerr set up ..etc..
//get the home page details
}
else
//bulid failure response
build home page
return to Home page

}


So here typically most ppl write business logic in controller and makes it in non human readable code.
for small projects like

JSP--->controller --> DAO(or typically hibernate calls) then ok

do the relevant stuff in controller (which is not a right practice especially for large applications)
#1
suppose u have an application which is built on Abstract factory patrren

and u have web services to server the 3rd parties

and ur own GUI for ur customers..
then ur controller class either makes a web services call or ... invoke the factory
typical business logic will be in Factory pattern

#2
In some applications.. you will have your own database and you will goto another back end(Banks/Ins etc)
these kind of applications you will see multi tier architecture
there is no way you can handle in controller class..

so it is always advisable to have separate business layer..

may be u r looking @ the below
M-V-C

Where "C" is again N-Tier there
in Spring the confusion is ...
we call the class name it self as ControllerClass..

DAO is typically holds the data base connection and pull the data and structure it into Value Objects which are now called PoJo classes

DAO layer is typically communication to Database and pull the relevant data and re frame it

[cherlapalli_jailer]

[quote name='Salividi' timestamp='1371535672' post='1303865695']
Interface ante enti? Didnt understand the discription in docs.oracle.
Started learning java....
[/quote]
simple ga cheppadaniki try chesanu

public Interface ProfileInterface{
public AFDBProfile getProfileDetails(Login loginObject) ;
}
//now looking @ the above interface hope who know what to do

This is how i designed my interface ...which tells if u pass on a login object output should be Profile Object.

now u r use this interface to write logic..

mean while the person who is using AFDBProfile object to show details on web ...has nothing to do with ur logic...

let us define 2 other classes too

public class Login{
private String uid ;
private String pwd;

setter and getter classes--here
}
public class AFDBProfile{
pivate boolean isLoginSuccess ;
isUserpostRights ;
private isUserMod;
private string status ;//her/legend etc,
private int totalPost ;
//similarly i decalare all the properties..
setter and geters common
}

now u need to implement my interface to write the business logic


public class Profiler implements ProfileInteface{

public AFDBProfile getProfileDetails(Login loginObject){

//gopto data base
//check user
//get user details
//bulid AFDBProfile
}

Same interface can be used by another person/developer for Administration module...

So typically Interface holds method signature but not logic..

so who ever implements the interface should over ride all the methods...

the main purpose of interfaces is to define the application structure and implementation logic

[fake_Bezawada]

interface ante it contains all abstarct methods machaaaa abstract methods ante vatiki body vundadhu just like a normal statement it will end with semicolon

interface ni implement chesukovali you cant extend it and implement chesukogane eclipse neeku error symbol chupisthadi implement un implemented methods anesi

ah un implemented menthods are nothing but abtsract methods present in interface

example plain java lo aythe Runnable interface class A implemenets Runnable ani rayi IDE neeku void run () method method ni implement chestadi body lo

or else web lo aythe neeku example ga Filters cheppachu

Filter ni implements cheyagane neeku doFilter method generate chesukomani IDE chupisthadi ................................

[cherlapalli_jailer]

[quote name='innovative' timestamp='1370650472' post='1303835542']

[url="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0CEYQFjAD&url=https%3A%2F%2Fvjv.googlecode.com%2Ffiles%2F978-1-4116-6824-9-preview.pdf&ei=CXSyUdGzOYLzygGAr4GYBQ&usg=AFQjCNHQtBcXt8Zr5iCetiP-WTaZ7svJWQ&sig2=nhvBn-U6MGJcI1UgpnWjNg&bvm=bv.47534661,d.aWM"]link 1[/url]

[url="http://ismails.files.wordpress.com/2007/07/hibernate-interview-questions.pdf"][b]hibernate [/b][/url]
[b][url="http://java.garnaik.com/pdf/java_garnaik_hibernate_advance_interview_questions.pdf"]hibernate[/url] - [color=#ff0000]code snippets tho explainatins vuntay .. good one [/color][/b]
[url="http://www.careervarsity.com/download/jsp.doc"][b]JSP[/b][/url] - [color=#ff0000][b]direct download[/b][/color]


[color=#ff0000][b]from bookmarks - for a quick review of concepts before interview : [/b][/color]
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will update
[/quote]
good post

[innovative]

[quote name='cherlapalli_jailer' timestamp='1371554190' post='1303865957']



public ViewModel LoginController((HttpServletRequest req,
@ModelAttributexxx xxx,
BindingResult result,SessionObject..)
{
// call ur bussinesLayer
AuthenticateMrg aumgr = new AuthenticateMrg() ;

Authenticate au = new Authenticate() ;
au = aumgr.checkLogin(xxx,req)
if(au.login()){
au.getHomepageDetails(xxx) ;//this will have all the logic ..like what r all the accounts ...payerr set up ..etc..
//get the home page details
}
else
//bulid failure response
build home page
return to Home page

}
[/quote]

Okay ... simply Database calls and data retrieval motham DAO lo cheyyali .. am I correct ?


[quote]

JSP--->controller --> DAO(or typically hibernate calls) then ok

do the relevant stuff in controller (which is not a right practice especially for large applications)
#1
[/quote]

But I think chala apps still business logic motham controller class lone rasthunnaru .. if im not wrong .. or then adhi typical MVC kadhu antara ...



[quote]
#2
In some applications.. you will have your own database and you will goto another back end(Banks/Ins etc)
these kind of applications you will see multi tier architecture
there is no way you can handle in controller class..

so it is always advisable to have separate business layer..
[/quote]

Ikkada oka point ardham kaledhu .. like company ki own datasource vunte malli back end vere third party meedha depend avvatam enti .. ardham kaledhu adhi ..
and also if datasource ki direct ga connect avvakunda some middleware through data ni app loki theskovalsi vasthe .. does it work in the same way ...

[quote]

DAO is typically holds the data base connection and pull the data and structure it into [b]Value Objects[/b] which are now called PoJo classes

[/quote]

Value objects ante like (key,value) pairs ? or mapping ?
POJO class are simply beans nah .. DAO class structures its output as pojo ? idhi ardham kaledhu ..

[quote]

DAO layer is typically communication to Database and pull the relevant data and re frame it
[/quote]

Naau kooda jus ee def varake thelusu ..

Thank you jailer ...

[Water]

[quote name='innovative' timestamp='1371600197' post='1303868275']




Value objects ante like (key,value) pairs ? or mapping ?
POJO class are simply beans nah .. DAO class structures its output as pojo ? idhi ardham kaledhu ..



Naau kooda jus ee def varake thelusu ..

Thank you jailer ...
[/quote]
[color=#282828][font=helvetica, arial, sans-serif][img]http://i47.tinypic.com/5kqceb.gif[/img][/font][/color]