springboot实现返回值国际化

开始一个新项目，有幸接触到后端进行添加国际化的设计，学习大佬的代码，并自己写了一个demo，记录如下：

1. 创建一个springboot工程，引入spring-web-starter的坐标

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

1. 创建文件夹以及配置文件

1. 创建中文配置文件

4.配置文件信息，点击OK

5.添加配置文件信息

6.看一下结构目录

7.创建一个实体类，在每次调用的时候加载该类

@Component
@Scope(value = WebApplicationContext.SCOPE_REQUEST)
public class MsgStorage {

    private Locale locale;

    public Locale getLocale() {
        return locale;
    }

    public void setLocale(Locale locale) {
        this.locale = locale;
    }
}

8.进行国际化语言的配置

import javax.inject.Provider;

public class I18n {

    @Autowired
    private Provider<MsgStorage> msgStorage;

    private final MessageSource messageSource;

    public I18n(MessageSource messageSource){
        this.messageSource = messageSource;
    }

    public String getMessage(String msg){
        return messageSource.getMessage(msg,null, msgStorage.get().getLocale());
    }

    public String getMessage1(String msg,Object[] args){
        return messageSource.getMessage(msg,args,msgStorage.get().getLocale());
    }
}

9.将国际化的配置进行加载

import java.util.Locale;

@Configuration
public class I18nConfig {

    @Bean
    public I18n i18nService() {
        return new I18n(messageSource());
    }

    @Bean
    public ResourceBundleMessageSource messageSource() {
        Locale.setDefault(Locale.CHINESE);
        ResourceBundleMessageSource source = new ResourceBundleMessageSource();
        source.setBasenames("i18n/demo");// name of the resource bundle
        source.setUseCodeAsDefaultMessage(true);
        source.setDefaultEncoding("UTF-8");
        return source;
    }

}

10.编写一个拦截器，在每次请求的时候将语言信息记录一下

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

@Component
public class ApiInterceptor implements HandlerInterceptor {

    @Autowired
    private Provider<MsgStorage> msgStorage;

    @Autowired
    public ApiInterceptor(Provider<MsgStorage> msgStorage) {
        this.msgStorage = msgStorage;
    }

    /**
     * 编写拦截器，设置判断语言类别
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求投中的语言类型
        String language = request.getHeader("language");
        //根据语言类型进行设置
        if("en".equals(language)){
            msgStorage.get().setLocale(Locale.ENGLISH);
        }
        if("zh".equals(language)){
            msgStorage.get().setLocale(Locale.CHINESE);
        }
        return true;
    }
}

11.将拦截器进行加载

@Configuration
public class WebConfig extends WebMvcConfigurationSupport {

    @Autowired
    private ApiInterceptor apiInterceptor;

    /**
     * 将拦截器注册到web容器中
     * @param registry
     */
    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(apiInterceptor);
    }

    /**
     * 解决乱码问题
     * @return
     */
    @Bean
    public HttpMessageConverter<String> responseBodyConverter() {
        StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter(Charset.forName("UTF-8"));
        stringHttpMessageConverter.setSupportedMediaTypes(Collections.singletonList(MediaType.APPLICATION_JSON_UTF8));
        return stringHttpMessageConverter;
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(responseBodyConverter());
    }
}

12.编写一个配置类

public class CommonRespMsg {

    /**
     * 你好，宝贝
     */
    public static final String DEMO_HELLO_BABY = "DEMO_HELLO_BABY";

    /**
     * 你好，小姑娘
     */
    public static final String DEMO_HELLO_GIRL = "DEMO_HELLO_GIRL";
}

13.配置controller进行测试

@RestController
@RequestMapping("i18n")
public class I18nController {

    @Autowired
    private I18n i18n;

    @GetMapping("baby")
    public String baby(){
        return i18n.getMessage(CommonRespMsg.DEMO_HELLO_BABY);
    }

    @GetMapping("girl")
    public String girl(){
        return i18n.getMessage(CommonRespMsg.DEMO_HELLO_GIRL);
    }
}

14.进行测试
中文：

英文：

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