Springboot international configuration

Create a new package named "i18n" under the resources directory to store the international configuration, and then under this package, we will create several properties configuration files to configure the language:
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Create 3 files, namely login.properties which takes effect when there is no language configuration; login_zh_CN.properties which takes effect in Chinese; login_en_US.properties which takes effect in English;
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add configuration parameters to application.properties to make our configuration take effect:

spring.messages.basename=i18n.login

Modify the front-end page:

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
		<meta name="description" content="">
		<meta name="author" content="">
		<title>Signin Template for Bootstrap</title>
		<!-- Bootstrap core CSS -->
		<link href="asserts/css/bootstrap.min.css" th:href="@{/asserts/css/bootstrap.min.css}" rel="stylesheet">
		<!-- Custom styles for this template -->
		<link href="asserts/css/signin.css" th:href="@{/asserts/css/signin.css}" rel="stylesheet">
	</head>

	<body class="text-center">
		<form class="form-signin" action="dashboard.html" th:action="@{/user/login}" method="post">
			<img class="mb-4" th:src="@{/asserts/img/bootstrap-solid.svg}" src="asserts/img/bootstrap-solid.svg" alt="" width="72" height="72">
			<h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1>

			<!--错误消息的显示-->
			<p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>

			<label class="sr-only" th:text="#{login.username}">Username</label>
			<input type="text" name="username" class="form-control" placeholder="Username" th:placeholder="#{login.username}" required="" autofocus="">
			<label class="sr-only"  th:text="#{login.password}">Password</label>
			<input type="password" name="password" class="form-control" placeholder="Password" th:placeholder="#{login.password}" required="">
			<div class="checkbox mb-3">
				<label>
          <input type="checkbox" value="remember-me" /> [[#{login.remember}]]
        </label>
			</div>
			<button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.btn}">Sign in</button>
			<p class="mt-5 mb-3 text-muted">© 2019-2020</p>
			<a class="btn btn-sm" th:href="@{/index.html(l='zh_CN')}">中文</a>
			<a class="btn btn-sm" th:href="@{/index.html(l='en_US')}">English</a>
		</form>
	</body>
</html>

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Carry internationalization information on the request parameters of the hyperlink:

<a class="btn btn-sm" th:href="@{/index.html(l='zh_CN')}">中文</a>
<a class="btn btn-sm" th:href="@{/index.html(l='en_US')}">English</a>

Custom internationalization parser: implement the LocaleResolver interface, if there is a "lang" parameter in the request parameter, use a custom internationalization parser in the logic, otherwise use the SpringBoot default internationalization parser

public class MyLocaleResolver implements LocaleResolver {
    
    
    @Override
    public Locale resolveLocale(HttpServletRequest Request) {
    
    

        String l = Request.getParameter("l");
        Locale locale=Locale.getDefault();
        if (!StringUtils.isEmpty(l)){
    
    
            String[] s = l.split("_");
            locale=new Locale(s[0],s[1]);
        }
        return locale;
    }

    @Override
    public void setLocale(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Locale locale) {
    
    

    }
}

Incorporate a custom internationalized parser into container management: add the following code to any configuration class

@Bean
public LocaleResolver localeResolver(){
    
    
	return new MyLocaleResolver();
}

At this time, as long as the request link with the parameter "l" will use our customized internationalization parser

So we can automatically switch between Chinese and English:

Springboot international configuration

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