无涯教程-Spring Boot - 国际化国际化是使您的应用程序适应不同语言和地区的过程，而无需对源代码进行工程更改

国际化是使您的应用程序适应不同语言和地区的过程，而无需对源代码进行工程更改。换句话说，国际化是本地化的准备。

在本章中，无涯教程将详细学习如何在Spring Boot中实现国际化。

依存关系

需要Spring Boot Starter Web和Spring Boot Starter Thymeleaf依赖性来在Spring Boot中开发Web应用程序。

Maven

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

Gradle

compile(org.springframework.boot:spring-boot-starter-web)
compile group: org.springframework.boot, name: spring-boot-starter-thymeleaf

LocaleResolver

无涯教程需要确定您的应用程序的默认语言环境。需要在Spring Boot应用程序中添加LocaleResolver bean。

@Bean
public LocaleResolver localeResolver() {
   SessionLocaleResolver sessionLocaleResolver = new SessionLocaleResolver();
   sessionLocaleResolver.setDefaultLocale(Locale.US);
   return sessionLocaleResolver;
}

LocaleChangeInterceptor

LocaleChangeInterceptor用于根据添加到请求中的language参数的值来更改新的Locale。

@Bean
public LocaleChangeInterceptor localeChangeInterceptor() {
   LocaleChangeInterceptor localeChangeInterceptor = new LocaleChangeInterceptor();
   localeChangeInterceptor.setParamName("language");
   return localeChangeInterceptor;
}

为此，需要将LocaleChangeInterceptor添加到应用程序的注册表拦截器中。配置类应扩展WebMvcConfigurerAdapter类，并重写addInterceptors()方法。

@Override
public void addInterceptors(InterceptorRegistry registry) {
   registry.addInterceptor(localeChangeInterceptor());
}

Messages Sources

默认情况下，Spring Boot应用程序从类路径下的 src/main/resources 文件夹中获取消息源。默认语言环境消息文件名应为 message.properties ，每个语言环境的文件名应为 messages_XX.properties 。 " XX"代表语言环境代码。

所有消息属性都应用作key/value 键值对。如果在语言环境中找不到任何属性，则应用程序将使用messages.properties文件中的默认属性。

默认的messages.properties将如下所示-

welcome.text=Hi Welcome to Everyone

法语的messages_fr.properties将如下所示-

welcome.text=Salut Bienvenue à tous

注意-消息源文件应另存为" UTF-8"文件格式。

HTML文件

在HTML文件中，使用语法#{key}显示来自属性文件的消息。

<h1 th:text="#{welcome.text}"></h1>

完整的代码如下

Maven-pom.hml

<?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.learnfk</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath />
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
  </span><span class="tag">&lt;dependency&gt;</span><span class="pln">
     </span><span class="tag">&lt;groupId&gt;</span><span class="pln">org.springframework.boot</span><span class="tag">&lt;/groupId&gt;</span><span class="pln">
     </span><span class="tag">&lt;artifactId&gt;</span><span class="pln">spring-boot-starter-test</span><span class="tag">&lt;/artifactId&gt;</span><span class="pln">
     </span><span class="tag">&lt;scope&gt;</span><span class="pln">test</span><span class="tag">&lt;/scope&gt;</span><span class="pln">
  </span><span class="tag">&lt;/dependency&gt;</span><span class="pln">

  </span><span class="tag">&lt;dependency&gt;</span><span class="pln">
     </span><span class="tag">&lt;groupId&gt;</span><span class="pln">org.springframework.boot</span><span class="tag">&lt;/groupId&gt;</span><span class="pln">
     </span><span class="tag">&lt;artifactId&gt;</span><span class="pln">spring-boot-starter-thymeleaf</span><span class="tag">&lt;/artifactId&gt;</span><span class="pln">
  </span><span class="tag">&lt;/dependency&gt;</span><span class="pln">

</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Gradle – build.gradle

buildscript {
   ext {
      springBootVersion = 1.5.8.RELEASE
   }
   repositories {
      mavenCentral()
   }
   dependencies {
      classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
   }
}
apply plugin: java
apply plugin: eclipse
apply plugin: org.springframework.boot
group = com.learnfk
version = 0.0.1-SNAPSHOT
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile(org.springframework.boot:spring-boot-starter-web)
compile group: org.springframework.boot, name: spring-boot-starter-thymeleaf
testCompile(org.springframework.boot:spring-boot-starter-test)
}

下面给出了主要的Spring Boot应用程序类文件-

package com.learnfk.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}

控制器类文件如下-

package com.learnfk.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class ViewController {
@RequestMapping("/locale")
public String locale() {
return "locale";
}
}

支持国际化的配置类

package com.learnfk.demo;
import java.util.Locale;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.i18n.SessionLocaleResolver;
@Configuration
public class Internationalization extends WebMvcConfigurerAdapter {
@Bean
public LocaleResolver localeResolver() {
SessionLocaleResolver sessionLocaleResolver = new SessionLocaleResolver();
sessionLocaleResolver.setDefaultLocale(Locale.US);
return sessionLocaleResolver;
}
@Bean
public LocaleChangeInterceptor localeChangeInterceptor() {
LocaleChangeInterceptor localeChangeInterceptor = new LocaleChangeInterceptor();
localeChangeInterceptor.setParamName("language");
return localeChangeInterceptor;
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(localeChangeInterceptor());
}
}

messages.properties如下所示-

welcome.text=Hi Welcome to Everyone

message_fr.properties如下所示-

welcome.text = Salut Bienvenue à tous

HTMLfile locale.html应该放置在类路径的模板目录下，如下所示:

<!DOCTYPE html>
<html>
   <head>
      <meta charset = "ISO-8859-1"/>
      <title>Internationalization</title>
   </head>
   <body>
      <h1 th:text = "#{welcome.text}"></h1>
   </body>
</html>

您可以创建一个可执行的JAR文件，并使用以下Maven或Gradle命令运行Spring boot应用程序-

对于Maven，请使用以下命令-

mvn clean install

在" BUILD SUCCESS"之后，您可以在目标目录下找到JAR文件。

对于Gradle，请使用以下命令-

gradle clean build

在" BUILD SUCCESSFUL"之后，您可以在build/libs目录下找到JAR文件。

现在，使用如下所示的命令运行JAR文件:

java –jar <JARFILE>

您会发现该应用程序已在Tomcat端口8080上启动。

现在在您的Web浏览器中点击URL http:// localhost:8080/locale ，您将看到以下输出-

URL http:// localhost:8080/locale?language=fr 将为您提供输出，如下所示:

无涯教程-Spring Boot - 国际化

依存关系

LocaleResolver

LocaleChangeInterceptor

Messages Sources

HTML文件

参考链接