[JAVA] [Spring] Read a message from a YAML file with MessageSource
Read a message from a YAML file with MessageResource
Motivation
It's troublesome to maintain messages.properties! !!
If you touch it with Eclipse, it will be native2ascii without permission, which is a problem! !! 11! !![^ 1]
So let's write in YAML
Purpose
When i18n is supported by an application that uses Spring Framework, a resource file (property file with the extension .properties) such as messages.properties will be used.
It's this kind of guy
message_ja.properties
#Can't you write in a hierarchical structure? No!
site.title=Site title
site.description=Site description
page.header.links.index=Site top
page.header.links.gettingstart=Get started
page.header.links.document=document
page.header.links.community=community
I want to write this like this. [^ 2]
message_ja.yaml
#Can you write in a hierarchical structure? Do I have to do native2ascii? Yay!
site:
title: "Site title"
description: "Site description"
page:
header:
links:
index: "Site top"
gettingstart: "Get started"
document: "document"
community: "community"
Even if I googled, I could not find an implementation example of Zubari itself, so I will write it like this.
Project configuration example
A project configuration example for making message resources YAML-enabled. [^ 3] YamlResourceBundle is used to read from the Yaml file. [^ 4]
The contents of each file are as follows. It's simple to do, so you can read it. So detailed explanation is omitted.
build.gradle
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'org.springframework.boot:spring-boot-gradle-plugin:2.0.2.RELEASE'
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
bootJar {
baseName = 'exercise1'
version = '0.0.1-SNAPSHOT'
}
repositories {
mavenCentral()
}
dependencies {
compile 'org.springframework.boot:spring-boot-devtools'
compile 'org.springframework.boot:spring-boot-starter-web'
compile 'org.springframework.boot:spring-boot-starter-thymeleaf'
compile 'net.rakugakibox.util:yaml-resource-bundle:1.1'
}
sourceCompatibility = '1.8'
targetCompatibility = '1.8'
ext['mainClass'] = 'pkg.exercise1.App'
ext['thymeleaf.version'] = '3.0.9.RELEASE'
ext['thymeleaf-layout-dialect.version'] = '2.3.0'
config/application.yml
spring:
thymeleaf:
mode: "HTML"
messages:
basename: "i18n/messages"
encoding: "UTF-8"
i18n/messages.yml
site:
title: "Excercise"
description: "This message is output from the YAML resource file"
templates/index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title data-th-text="#{site.title}">Title</title>
</head>
<body>
<div>
<article>
<h1 data-th-text="#{site.title}">Title</h1>
<p data-th-text="#{site.description}">This is Index page. Yeah!</p>
<hr />
<h2>API</h2>
<ul>
<li><a href="#" data-th-href="@{/api/hello}">/api/hello</a></li>
</ul>
</article>
</div>
</body>
</html>
pkg/exercise1/App.java
package pkg.exercise1;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class App {
public static void main(String... args) {
SpringApplication.run(App.class, args);
}
}
pkg/exercise1/configurations/MessageSourceConfig.java
package pkg.exercise1.configurations;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ResourceBundleMessageSource;
import net.rakugakibox.util.YamlResourceBundle;
@Configuration
public class MessageSourceConfig {
@Bean("messageSource")
public MessageSource messageSource(
@Value("${spring.messages.basename}") String basename,
@Value("${spring.messages.encoding}") String encoding
) {
YamlMessageSource ms = new YamlMessageSource();
ms.setBasename(basename);
ms.setDefaultEncoding(encoding);
ms.setAlwaysUseMessageFormat(true);
ms.setUseCodeAsDefaultMessage(true);
ms.setFallbackToSystemLocale(true);
return ms;
}
}
class YamlMessageSource extends ResourceBundleMessageSource {
@Override
protected ResourceBundle doGetBundle(String basename, Locale locale) throws MissingResourceException {
return ResourceBundle.getBundle(basename, locale, YamlResourceBundle.Control.INSTANCE);
}
}
pkg/exercise1/controllers/IndexController.java
package pkg.exercise1.controllers;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class IndexController {
@RequestMapping("/")
String home() {
return "index";
}
}
Browser display
Start the Spring Boot application and try to access [http: // localhost: 8080](http: // localhost: 8080).
I did it. [^ 5]
[^ 1]: Netbeans displays multiple languages side by side, so it's easy to translate and doesn't do native2ascii. He understands the story. However, I have to say that it is honestly subtle if it is easy to use as a development environment because it lacks various functions.
[^ 2]: Everyone wants to write like this. I don't want to write, but this page doesn't open. (Mystery)
[^ 3]: There are some extra packages, but don't worry.
[^ 4]: For this purpose, you only need to use the YamlResourceBundle.Control class.
[^ 5]: Confirmed display in English (en) locale. evidence? Hey, that's: smiling_imp:
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