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Spring Data MongoDB Hello World with Spring MVC: Example

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Spring Data MongoDB Hello World with Spring MVC: Example

This article presents detailed steps on what is needed to get started with Spring Data MongoDB while you are working with a Spring MVC web application.

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This article presents detailed steps on what is needed to get started with Spring Data MongoDB while you are working with a Spring MVC web application. The article assumes that you have got the Spring MVC application setup done.

Step 1: Create Documents in MongoDB

One could download MongoDB from http://www.mongodb.org/downloads page. Once downloaded, do the following to get started.

  • Open a command prompt & goto bin folder found within MongoDB root folder.
  • Before starting MongoDB server, create the data directory within root folder.
  • Start the MongoDB server with command such as “mongod -dbpath <path-to-mongodb-root-folder>”
  • Open another command prompt and goto bin folder.
  • Execute “mongo” command and you are all set. Access various DB commands at http://docs.mongodb.org/manual/reference/command/.
  • As there is no command to create the database, give “use testdb” and testdb would be created.
  • Create a collection using following command – db.createCollection( “users” )
  • Check whether the collection is created by executing “show collections” command.
  • Insert records using command: db.runCommand( { insert: “users”, documents: [ { _id: 1, firstname: "ajitesh", lastname: "shukla" }] } )
  • Check the document using command, db.testdb.find()

Step 2: Spring Data MongoDB Libraries

Download following libraries and place them within WEB-INF/lib folder and the classpath. These are latest libraries at the time of writing the blog.

Step 3: Create Users Class

Create User class pertaining to “users” document within MongoDB. Following is the sample code:

package com.vitalflux.hellomongo;

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

@Document(collection="users")
public class Users {

    @Id
    private String id;

    private String firstname;
    private String lastname;

    public Users() {}

    public Users(String firstName, String lastName) {
        this.firstname = firstName;
        this.lastname = lastName;
    }

 /**
 * @return the id
 */
public String getId() {
return id;
}

/**
 * @param id the id to set
 */
public void setId(String id) {
this.id = id;
}

/**
 * @return the firstName
 */
public String getFirstName() {
return firstname;
}

/**
 * @param firstName the firstName to set
 */
public void setFirstName(String firstName) {
this.firstname = firstName;
}

/**
 * @return the lastName
 */
public String getLastName() {
return lastname;
}

/**
 * @param lastName the lastName to set
 */
public void setLastName(String lastName) {
this.lastname = lastName;
}

}

Step 4: Create UsersRepository Interface

package com.vitalflux.mongo.repositories;

import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;

import com.vitalflux.hellomongo.Users;

@Repository
public interface UsersRepository extends MongoRepository<Users, String>{
}

Step 5: Create A Controller

package com.vitalflux.hellomongo;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.vitalflux.mongo.repositories.UsersRepository;

@Controller
public class HelloMongoController {

@Autowired
private UsersRepository repository;

@RequestMapping(value = "/", method = RequestMethod.GET)
public ModelAndView helloWorld( ModelMap model ) {
List users = repository.findAll();

ModelAndView modelAndView = new ModelAndView("index");
modelAndView.addObject("users", users );
return modelAndView;
}
}

Step 6: Configure Spring-Servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
<strong>xmlns:mongo="http://www.springframework.org/schema/data/mongo"</strong>
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
<strong>     http://www.springframework.org/schema/data/mongo
     >">

<context:component-scan base-package="com.vitalflux.hellomongo" />
<context:component-scan base-package="com.vitalflux.mongo.repositories" />

     <!-- Configuration defining views files -->

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix">
        <value>/WEB-INF/views/</value>
    </property>
    <property name="suffix">
        <value>.jsp</value>
    </property>
</bean>

<strong><!-- Factory bean that creates the Mongo instance -->
<bean id="mongo" class="org.springframework.data.mongodb.core.MongoFactoryBean">
    <property name="host" value="localhost" />
</bean>

<!-- MongoTemplate for connecting and quering the documents in the database -->
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
     <constructor-arg name="mongo" ref="mongo" />
     <constructor-arg name="databaseName" value="test" />
</bean>

<mongo:repositories base-package="com.vitalflux.mongo.repositories" />
</strong>
</beans>

Step 7: Create A View, index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ page import="java.util.List"%>
<%@ page import="com.vitalflux.hellomongo.Users"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
</head>
<body>
<%
List<Users> users = (List<Users>) request.getAttribute( "users" );
%>
<%
for (Users user : users) {
pageContext.setAttribute("firstname", user.getFirstName() );
%>
<div>${firstname}</div>
<%
}
%>
</body>
</html>

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Topics:
nosql ,mvc ,mongodb ,spring data ,database

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