Data Retrieval using RESTFul Web Service (Hibernate + Spring + Maven)

8/17/2019 Data Retrieval using RESTFul Web Service (Hibernate + Spring + Maven)

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Data Retrieval using

RESTFul Web Service

+Hibernate

(Maven project using Eclipse)


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Introduction

This docuent e!plains ho" to "rite a RESTFul "eb service# The e!aple ta$en heresho"s ho" to select data %ro the database using Hibernate &ueries# The project is built

using eclipse with Spring framework and Maven.

Create maven project in Eclipse

'reate a ne" siple Maven roject in Eclipse# ou can search the docuentation %or thesae online#

Create pom.xml

4.0.0rest!ulrest!ul

0.$rest!ul

java.nethttp://do#nload.java.net/maven/&/

javax.servletservlet(api

&.*


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org.spring!rame#or"spring('eans+,org.spring!rame#or".version-

org.spring!rame#or"spring(jd'c

+,org.spring!rame#or".version-

org.spring!rame#or"spring(#e'+,org.spring!rame#or".version-

org.spring!rame#or"spring(#e'mvc+,org.spring!rame#or".version-

org.spring!rame#or"spring(orm+,org.spring!rame#or".version-

org.spring!rame#or"spring(aspects+,org.spring!rame#or".version-

org.hi'ernatehi'ernate(entit%manager

..&.

tagli'sstandard$.$.&

javax.servletjstl$.$.&

m%s1lm%s1l(connector(java*.$.$0

commons(d'cpcommons(d'cp&0002&*.$244&2

commons(poolcommons(pool

&0002&*.$2343

javax.transaction


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jta$.$

This should autoaticall* start do"nloading aven jar %iles related to the

po#!l entries# % not, then

-) right clic$ on project %ro project e!plorer.) select Run /s 01 Maven nstall

web.xml

rest!ul

index.html spring


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org.spring!rame#or".#e'.servlet.@ispatcher6ervlet $ spring

/

spring-servlet.xml

This %ile contains in%oration about the dispatcher servlet "hich "ill run# t also has

re%erences to

•

Database connection properties• Hibernate con%iguration

• Message bundle (optional)

2elo" is ho" the %ile loo$s li$e#


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class="org.#prngramewor.conte%t.#(pport.e)oa&a*)ee#o(rce(n&)eMe##age!o(rce">

/BC(8/hi'ernate(c!g.xml

org.hi'ernate.c!g.nnotationAon!iguration

true


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import com.rest!ul.6ervice.ser@ata6erviceJ

KAontrollerpublic class ;estulAontroller ,

Kuto#iredser@ata6ervice user@ata6erviceJ

K;e1uest9appingvalue = Hdata;etrievalHM method = ;e1uest9ethod.@5T Npublic K;esponseCod%List get@atarom@ata'aseK;e1uestGaram 9ap

re1uestGaramsM Ittp6ervlet;esponse responseN ,

response.setAontent%peHapplication/jsonHNJresponse.set6tatus&00NJreturn [email protected]

--

2elo" is ho" the Rest%ul "eb service "ill be called,

http://server-ip!:"#"#/restful/dataRetrieval

$nce this url is hit with dataRetrieval as re%uest mapping& the associated methodget'ata(rom'atabase is called. )he method in turn invo*es a service which capturesdata from database and sends the data in +,$ format and sends to the place fromwhere the Restful web service is called.

serEntit.java 0Entit class mapped to database table1

3serEntit*#java is the class "hich is apped "ith the database table 3SER#

package com.rest!ul.ntit%J

import javax.persistence.AolumnJimport javax.persistence.ntit%Jimport javax.persistence.dJimport javax.persistence.a'leJ

Kntit%Ka'lename=H6;HNpublic class serntit% ,

KdKAolumnname=H@HM nulla'le=falseM length=*Nprivate int @J

KAolumnname=H89HM nulla'le=falseM length=*0Nprivate 6tring !irst8ameJ

KAolumnname=HL89HM nulla'le=falseM length=*0N

private 6tring last8ameJ

KAolumnname=H9LHM nulla'le=falseM length=*0Nprivate 6tring emailddressJ


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/OO O @return the i@ O/public int get@N ,

return @J

-

/OO O @param i@ the i@ to set O/public void set@int i@N ,

@ = i@J-

/OO O @return the !irst8ame O/public 6tring getirst8ameN ,

return !irst8ameJ-

/OO O @param !irst8ame the !irst8ame to set O/public void setirst8ame6tring !irst8ameN ,

this.!irst8ame = !irst8ameJ-

/OO O @return the last8ame O/

public 6tring getLast8ameN ,return last8ameJ

-

/OO O @param last8ame the last8ame to set O/public void setLast8ame6tring last8ameN ,

this.last8ame = last8ameJ-

/OO O @return the emailddress O/public 6tring getmailddressN ,

return emailddressJ-

/OO O @param emailddress the emailddress to set O/public void setmailddress6tring emailddressN ,

this.emailddress = emailddressJ-

-


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ser'ata,ervice.java and ser'ata,erviceImpl.java

These %iles a$e service la*er# Data access objects "hich interact "ith the database are

called %ro these services "hich in turn provide the data to the controller class#

UserDataService.java

package com.rest!ul.6erviceJ

import java.util.ListJimport com.rest!ul.ntit%.serntit%J

public interface ser@ata6ervice ,

public List getllsersNJ-

UserDataServiceImpl.java

package com.restful.Service;

import java.util.ListJ

import org.spring!rame#or".'eans.!actor%.annotation.uto#iredJimport org.spring!rame#or".stereot%pe.6erviceJimport org.spring!rame#or".transaction.annotation.ransactionalJ

import [email protected]@7J

import com.rest!ul.ntit%.serntit%J

K6ervicepublic class ser@ata6ervicempl implements ser@ata6ervice ,

Kuto#iredser@7 user@7J

KransactionalK7verridepublic List getllsersN ,

return [email protected]

}


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ser'2$.java and ser'2$Impl.java

These data access objects counicate "ith database in order to retrieve the data using

hibernate %rae"or$#

UserDA.java

package comrestful!"#$

import java.util.ListJimport com.rest!ul.ntit%.serntit%J

public interface ser@7 ,

public List getllsersNJ-

UserDAImpl.java

package com.rest!ul.@7J

import java.util.ListJ

import org.hi'ernate.6essionactor%Jimport org.spring!rame#or".'eans.!actor%.annotation.uto#iredJimport org.spring!rame#or".stereot%pe.AomponentJimport org.hi'ernate.Duer%J

import com.rest!ul.ntit%.serntit%J

KAomponentHser@7HNpublic class ser@7mpl implements ser@7 ,

Kuto#iredprivate 6essionactor% sessionactor%J

K6uppressBarningsHunchec"edHNK7verridepublic List getllsersN ,

Duer% 1uer% = this.sessionactor%.getAurrent6essionN.createDuer%Hselect user@etails !rom serntit% user@etailsHNJ

List userList = nullJuserList = 1uer%.listNJ

return userListJ-

-


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3aven pdate& Clean and Install

• Right clic$ on roject %ro project e!plorer

• Select Maven01 3pdate roject

• Right clic$ on project %ro project e!plorer

• Select Run /s 01 Maven 'lean

• Right clic$ on project %ro project e!plorer

• Select Run /s 01 Maven nstall

'ispatcher ,ervlet Error

There are chances that *ou "ill get belo" error#

6V;: 6ervlet /rest!ul thre# loadN exceptionjava.lang.Alass8otoundxception:org.spring!rame#or".#e'.servlet.@ispatcher6ervlet

2elo" is ho" to resolve it#

-) Right clic$ on roject.) Select Deplo*ent /ssebl*

4) /dd Maven Dependiencies directive

04o to next 5age1


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5roject ,tructure


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Chec* how Rest(ul 6eb ,ervice wor*s

nstall Mo5illa /ddon RE,)Client. 3sing this addon "e can siulate 6ET, 3T,DE7ETE, 8ST, 8T89S, HE/D etc#

Data Retrieval using RESTFul Web Service (Hibernate + Spring + Maven)

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