Java Spring Configuration File Example

Spring Boot XML Configuration Example

March 18, 2017

On this page we will provide spring boot XML configuration example. We will create a REST web service with XML configuration. We will import our XML file in java configuration. We need to use @ImportResource with @Configuration in our spring boot application. We can keep our XML files in project classpath. Here we will create a spring boot web application that will work as REST web service. We will create a service class and that will be configured in XML configuration. We will also configure Jackson2 message converter in our XML configuration to indent JSON response.
To load XML configuration, @ImportResource is used as follows.

@ImportResource("classpath:app-config.xml")            

We will use @ImportResource with @SpringBootApplication in our spring boot application. Find the complete example step by step.

Contents

• Software Used
• Project Structure in Eclipse
• Maven File
• Create XML Configuration
• Use @ImportResource to Import XML Configuration
• Create Service and Controller
• Test Application
• Reference
• Download Source Code

Software Used

We are using following software in our example.
1. Java 8
2. Spring Boot 1.5.2.RELEASE
3. Maven 3.3
4. Eclipse Mars

Project Structure in Eclipse

Find the project structure in eclipse.

Maven File

Find the maven file used in our example.
pom.xml

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 	 	<modelVersion>4.0.0</modelVersion> 	<groupId>com.concretepage</groupId> 	<artifactId>spring-boot-demo</artifactId> 	<version>0.0.1-SNAPSHOT</version> 	<packaging>jar</packaging> 	<name>spring-demo</name> 	<description>Spring Boot Demo Project</description> 	<parent> 		<groupId>org.springframework.boot</groupId> 		<artifactId>spring-boot-starter-parent</artifactId> 		<version>1.5.2.RELEASE</version> 	</parent> 	<properties> 		<java.version>1.8</java.version> 	</properties> 	<dependencies> 	   <dependency> 		<groupId>org.springframework.boot</groupId> 		<artifactId>spring-boot-starter-web</artifactId> 	   </dependency>     	   <dependency>                 <groupId>org.springframework.boot</groupId>                 <artifactId>spring-boot-devtools</artifactId>                 <optional>true</optional>            </dependency>  	</dependencies>  	<build> 	   <plugins> 		<plugin> 			<groupId>org.springframework.boot</groupId> 			<artifactId>spring-boot-maven-plugin</artifactId> 		</plugin> 	   </plugins> 	</build> </project>            

Find the description of spring boot starter configured in maven file.
spring-boot-starter-parent : Parent POM for dependency management.
spring-boot-starter-web: Starter for building web, REST applications. It uses tomcat server as default embedded server.
spring-boot-devtools : It provides developer tools. These tools are helpful in application development mode. One of the features of developer tool is automatic restart of the server for any change in code.
spring-boot-maven-plugin : It is used to create executable JAR of the application.

Create XML Configuration

I have created a sample XML configuration.
app-config.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"     xmlns:mvc="http://www.springframework.org/schema/mvc"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="         http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans.xsd         http://www.springframework.org/schema/mvc         http://www.springframework.org/schema/mvc/spring-mvc.xsd">                   <bean class="com.concretepage.service.ArticleService"/> 	<bean name="jackson2ObjectMapper" class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"> 	    <property name="indentOutput" value="true"/> 	</bean>     	<mvc:annotation-driven> 	    <mvc:message-converters> 	        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> 	            <property name="objectMapper" ref="jackson2ObjectMapper" /> 	        </bean> 	    </mvc:message-converters> 	</mvc:annotation-driven> </beans>            

Here I have created a bean for service class. To indent the JSON response we have configured Jackson2 message converter. We will use this XML configuration in our spring boot application.

Use @ImportResource to Import XML Configuration

XML file is imported in configuration file using @ImportResource with @Configuration. In our main class we are using @SpringBootApplication annotation. @SpringBootApplication is the combination of @Configuration, @EnableAutoConfiguration and @ComponentScan annotations.
MyApplication.java

package com.concretepage; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.ImportResource; @SpringBootApplication @ImportResource("classpath:app-config.xml") public class MyApplication {   	public static void main(String[] args) { 		SpringApplication.run(MyApplication.class, args);         }        }            

Create Service and Controller

Find the service used in our example.
ArticleService.java

package com.concretepage.service; import java.util.ArrayList; import java.util.List; import com.concretepage.entity.Article; public class ArticleService { 	public List<Article> getAllArticles(){ 		List<Article> list = new ArrayList<Article>(); 		list.add(new Article(1, "Java Concurrency", "Java")); 		list.add(new Article(2, "Hibernate HQL", "Hibernate")); 		list.add(new Article(3, "Spring MVC with Hibernate", "Spring")); 		return list; 	} }            

Article.java

package com.concretepage.entity; public class Article {          private int articleId;           private String title; 	private String category;         public Article(int articleId, String title, String category) {     	    this.articleId = articleId;     	    this.title = title;     	    this.category = category;    	         } 	public int getArticleId() { 		return articleId; 	} 	public String getTitle() { 		return title; 	} 	public String getCategory() { 		return category; 	} }            

Find the controller used in our example.
ArticleController.java

package com.concretepage.controller; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.concretepage.entity.Article; import com.concretepage.service.ArticleService; @RestController @RequestMapping("user") public class ArticleController { 	@Autowired 	private ArticleService articleService; 	@GetMapping("articles") 	public List<Article> getAllArticles() { 		List<Article> list = articleService.getAllArticles(); 		return list; 	} }            

Test Application

Find the steps to test the application.
1. Download the project source code and import into eclipse.
2. Go to the root folder using command prompt and run the command

mvn clean eclipse:eclipse            

Refresh the project in eclipse. Now classpath is set.
3. Open the MyApplication class and run as java application.
4. Access the URL

http://localhost:8080/user/articles            

Find the print screen of the output.

Reference

Importing XML configuration

Download Source Code

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Source: https://www.concretepage.com/spring-boot/spring-boot-xml-configuration-example

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