Believe it

SpringBoot4-Web4-国际化

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国际化

  • 编辑国际化配置文件
  • 使用ResourceBundleMessageSource管理国际化资源文件
  • 在页面使用fmt:message取出国际化内容

创建resources/i18n

然后创建login_zh_CN.properties 选择Resouerce Bundle
SpringBoot自动创建了管理国际化资源文件的组件

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@Configuration(proxyBeanMethods = false)
@ConditionalOnMissingBean(name = AbstractApplicationContext.MESSAGE_SOURCE_BEAN_NAME, search = SearchStrategy.CURRENT)
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
@Conditional(ResourceBundleCondition.class)
@EnableConfigurationProperties
public class MessageSourceAutoConfiguration {

    private static final Resource[] NO_RESOURCES = {};

    @Bean
    @ConfigurationProperties(prefix = "spring.messages")
    public MessageSourceProperties messageSourceProperties() {
        return new MessageSourceProperties();
    }

    @Bean
    public MessageSource messageSource(MessageSourceProperties properties) {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        if (StringUtils.hasText(properties.getBasename())) {
            messageSource.setBasenames(StringUtils
                    .commaDelimitedListToStringArray(StringUtils.trimAllWhitespace(properties.getBasename())));
        }
        if (properties.getEncoding() != null) {
            messageSource.setDefaultEncoding(properties.getEncoding().name());
        }
        messageSource.setFallbackToSystemLocale(properties.isFallbackToSystemLocale());
        Duration cacheDuration = properties.getCacheDuration();
        if (cacheDuration != null) {
            messageSource.setCacheMillis(cacheDuration.toMillis());
        }
        messageSource.setAlwaysUseMessageFormat(properties.isAlwaysUseMessageFormat());
        messageSource.setUseCodeAsDefaultMessage(properties.isUseCodeAsDefaultMessage());
        return messageSource;
    }
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/**
 * Configuration properties for Message Source.
 *
 * @author Stephane Nicoll
 * @author Kedar Joshi
 * @since 2.0.0
 * /
public class MessageSourceProperties {

    /**
     * Comma-separated list of basenames (essentially a fully-qualified classpath
     * location), each following the ResourceBundle convention with relaxed support for
     * slash based locations. If it doesn't contain a package qualifier (such as
     * "org.mypackage"), it will be resolved from the classpath root.
     */
    private String basename = "messages";

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spring.messages.basename = i18n.login

thymeleaf 取国际化信息

使用#{}

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<h1 class="..." th:text="#{login.tip}">Please sign in</h1>

解决乱码

setting - editor - fileEncoding - utf8 - 自动转阿斯克码

测试

在浏览器中选择浏览器默认的语言就可以了,即他可以根据浏览器的语言信息设置语言了

如何实现点按钮实现不同语言呢

国际化原理

locale: LocaleResolver
根据请求头的区域信息来进行国际化

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@Bean
@ConditionalOnMissingBean
@ConditionalOnProperty(prefix = "spring.mvc", name = "locale")
public LocaleResolver localeResolver() {
    if (this.mvcProperties.getLocaleResolver() == WebMvcProperties.LocaleResolver.FIXED) {
        return new FixedLocaleResolver(this.mvcProperties.getLocale());
    }
    AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
    localeResolver.setDefaultLocale(this.mvcProperties.getLocale());
    return localeResolver;
}

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@Override
public Locale resolveLocale(HttpServletRequest request) {
    Locale defaultLocale = getDefaultLocale();
    if (defaultLocale != null && request.getHeader("Accept-Language") == null) {
        return defaultLocale;
    }
    Locale requestLocale = request.getLocale();
    List<Locale> supportedLocales = getSupportedLocales();
    if (supportedLocales.isEmpty() || supportedLocales.contains(requestLocale)) {
        return requestLocale;
    }
    Locale supportedLocale = findSupportedLocale(request, supportedLocales);
    if (supportedLocale != null) {
        return supportedLocale;
    }
    return (defaultLocale != null ? defaultLocale : requestLocale);
}

先写个链接把区域信息加上去

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

然后自己实现区域信息解析器

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@Bean
public LocaleResolver localeResolver(){
    return new MyLocaleResolver();
}
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package com.wsx.springboothelloworld.component;

import org.springframework.cglib.core.Local;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.LocaleResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Locale;


public class MyLocaleResolver implements LocaleResolver {

    @Override
    public Locale resolveLocale(HttpServletRequest request) {
        String l = request.getParameter("l");
        if(!StringUtils.isEmpty(l)) {
            String[] split = l.split("_");
            return new Locale(split[0], split[1]);
        }
        return Locale.getDefault();
    }

    @Override
    public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {

    }
}

处理post

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package com.wsx.springboothelloworld.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

public class LoginController {
    @RequestMapping(value="",method= RequestMethod.POST)
    public String login(){
        return "dashborad";
    }
}

简化写法

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package com.wsx.springboothelloworld.controller;

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;


public class LoginController {
//    @RequestMapping(value="",method= RequestMethod.POST)
    @PostMapping("")
    public String login(@RequestParam("username") String username,
                        @RequestParam("password") String password){
        return "dashborad";
    }
}


如果成功就进入dashborad，否则就提示用户名密码错误， 考虑使用map实现
这一步后我们可能会碰到一些问题，这是缓存导致的，加入下面的配置

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spring.thymeleaf.cache=false

然后ctrl+f9手动加载html到编译的文件中，这不必重新开启Spring了

做一个判断来决定标签是否生效

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<p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>

表单重复提交问题。需要用重定向、视图、拦截器解决，重定向加视图能确保没有重复提交，但是会导致直接跳过登陆的问题，

拦截器

创建拦截器

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package com.wsx.springboothelloworld.component;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginHandlerInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object loginUser = request.getSession().getAttribute("loginUser");
        if (loginUser == null) {
            request.setAttribute("msg","没有权限，请先登录");
            request.getRequestDispatcher("/index.html").forward(request,response);
            return false;
        } else {
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

将登陆成功的用户放入seesion

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public class LoginController {
    //    @RequestMapping(value="",method= RequestMethod.POST)
    @PostMapping("")
    public String login(@RequestParam("username") String username,
                        @RequestParam("password") String password,
                        Map<String, Object> map,
                        HttpSession httpSession) {
        if (password.endsWith("123456")) {
            httpSession.setAttribute("loginUser", username);
            return "dashborad";
        } else {
            return "404";
        }
    }
}

springboot已经做好了静态资源，不用管他们，不会被拦截, 注意addPathPatterns.excludePathPatterns可以一直搞下去，拦截所有的页面，放行两个html

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@Bean
public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){
    return new WebMvcConfigurerAdapter() {
        @Override
        public void addViewControllers(ViewControllerRegistry registry) {
            registry.addViewController("/wsx2").setViewName("templates_hello");
            registry.addViewController("/wsx3").setViewName("templates_hello");
        }

        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            super.addInterceptors(registry);
            //
            registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**").excludePathPatterns("/index.html","/user/login");
        }
    };
}

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