Spring Framework

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Spring Framework

       
Question: 
How to use properties file to load country options
Answer:
This solution will show you how to place the country options in a properties file. The values will no longer be hard coded in the Java code.
1. Create a properties file to hold the countries. It will be a name value pair.  Country code is name. Country name is the value.
New text file:  WEB-INF/countries.properties

BR=Brazil 
FR=France 
CO=Colombia 
IN=India

Note the location of the properties file is very important. It must be stored in WEB-INF/countries.properties
2. Update header section for Spring config file
We are going to use a new set of Spring tags for <util>. As a result, you need to update the header information in the Spring config file.
File: spring-mvc-dmo-servlet.xml
Remove the previous header and add this.

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
        xmlns:context="http://www.springframework.org/schema/context" 
        xmlns:mvc="http://www.springframework.org/schema/mvc" 
        xmlns:util="http://www.springframework.org/schema/util" 
        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/context     
            http://www.springframework.org/schema/context/spring-context.xsd     
            http://www.springframework.org/schema/mvc         
            http://www.springframework.org/schema/mvc/spring-mvc.xsd 
            http://www.springframework.org/schema/util     
            http://www.springframework.org/schema/util/spring-util.xsd">

3. Load the country options properties file in the Spring config file. Bean id: countryOptions
File: spring-mvc-dmo-servlet.xml
Add the following lines:
<util:properties id="countryOptions" location="classpath:../countries.properties" />
4. Inject the properties values into your Spring Controller: StudentController.java

@Value("#{countryOptions}") 
private Map<String, String> countryOptions;

5. Add the country options to the Spring MVC model. Attribute name: theCountryOptions

@RequestMapping("/showForm") 
public String showForm(Model theModel) { 

    // create a student object Student 
    Student theStudent = new Student();
 
    // add student object to the model 
    theModel.addAttribute("student", theStudent); 

    // add the country options to the model 
    theModel.addAttribute("theCountryOptions", countryOptions); 

    return "student-form"; 
}

6. Update the JSP page, student-form.jsp, to use the new model attribute for the drop-down list: theCountryOptions

<form:select path="country"> 
 <form:options items="${theCountryOptions}" />
</form:select>

7. Remove all references to country option from your Student.java.  


FAQ: How to populate radiobuttons with items from Java class like we did with selectlist?

You can follow a similar approach that we used for the drop-down list.
Here are the steps
1. Set up the data in your Student class
Add a new field
    private LinkedHashMap<String, String> favoriteLanguageOptions;
In your constructor, populate the data
        // populate favorite language options
        favoriteLanguageOptions = new LinkedHashMap<>();
        // parameter order: value, display label
        //
        favoriteLanguageOptions.put("Java", "Java");
        favoriteLanguageOptions.put("C#", "C#");
        favoriteLanguageOptions.put("PHP", "PHP");
        favoriteLanguageOptions.put("Ruby", "Ruby");      
Add getter method
    public LinkedHashMap<String, String> getFavoriteLanguageOptions() {
        return favoriteLanguageOptions;
    }
2. Reference the data in your form
        Favorite Language:
      
        <form:radiobuttons path="favoriteLanguage" items="${student.favoriteLanguageOptions}"  />
Source code is available here:
- https://gist.github.com/darbyluv2code/debb69b1bf8010d84d50e0542e809ffb

Core Dependencies <dependencies>
  <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.13</version>
</dependency>
    
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>
    
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>
    
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-beans</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.7</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.7</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.7</version>
</dependency>
  </dependencies>


Configure web.xml 

<servlet>
  <servlet-name>form-tags</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
  <servlet-name>form-tags</servlet-name>
  <url-pattern>/spring/*</url-pattern>

  </servlet-mapping>

configure servlet.xml 

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"

xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd

http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">

<!--  MAKING ANOOTATION AWARE -->
<context:annotation-config></context:annotation-config>

<!-- SCANNING ONLY SPRING CLASSES -->
<context:component-scan base-package="com.form.tag.demo"></context:component-scan>

<!--  PROJECT IS MVC AWARE  -->
<mvc:annotation-driven></mvc:annotation-driven>


  

<!-- Step 5: Define Spring MVC view resolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>


</beans>