SpringBoot 国际化配置项目实战（三）

喜欢ヅ旅行 2022-09-16 05:49 207阅读 0赞

springboot 项目中实战演练，功能有参数非空校验、默认国际化、正常返回参数国际化、抛异常后信息国际化、全局异常后继续切面拦截国际化、动态参数国际化等后端各个方面的实战。

1、新建springboot微服务，pom中jar的基本引用

<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.14.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-aop</artifactId>
    		</dependency>
    
    		<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>
    		<dependency>
    			<groupId>net.sourceforge.nekohtml</groupId>
    			<artifactId>nekohtml</artifactId>
    		</dependency>
    		<dependency>  
    		    <groupId>org.springframework.boot</groupId>  
    		    <artifactId>spring-boot-devtools</artifactId>  
    		    <optional>true</optional>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </dependency>
        </dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>

2、yml配置文件；

spring:
        thymeleaf:
            encoding=UTF-8
            content-type=text/html
            cache=false
            mode=LEGACYHTML5
        messages:
            encoding: UTF-8
            cache-seconds: 1
            basename: static/i18n/messages

3、properties的创建：

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAbmFuZGFvMTU4_size_20_color_FFFFFF_t_70_g_se_x_16][]

引入配置信息：比如英文版

demo.key.null= key not null !!!
    
    1000=hello{0}, your verification code is: {1}

4、WebMvcConfigurationSupport 类中接口的重写：

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.MessageSource;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.validation.Validator;
    import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
    
    
    /**
     * @author wanghuainan
     * @date 2021/10/13
     * 在URL后面加参数，并且使用默认国际化校验时不需要此类 （如果自定义国际化配置文件一定需要此类）?lang=zh_CN/?lang=zh_US;
     * 如果后端通过请求头接参数：accept-language:zh-CN/en ，则需要调此类，如果不加此类报错："resultMsg": "{demo.key.null}"(使用默认国际化校验时不需要此类);即上下可能是互斥的
     */
    @Configuration
    public class ValidatorConfiguration extends WebMvcConfigurationSupport {
        @Autowired
        private MessageSource messageSource;
    
        @Override
        public Validator getValidator() {
            return validator();
        }
    
        @Bean
        public Validator validator() {
            LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
            validator.setValidationMessageSource(messageSource);
            return validator;
        }
    }

5、全局异常的创建：

@Slf4j
    @RestControllerAdvice
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public class AppExceptionHandler {
    
        @Autowired
        MessageSource messageSource;
    
        @ExceptionHandler(value = MethodArgumentNotValidException.class)
        public Object methodArgumentNotValid(HttpServletRequest req, MethodArgumentNotValidException  ex)  {
    
           // Request r= new Request();源码所示
            //ResultBean result = ResultBean.FAIL;
            ResponseDTO result = new ResponseDTO();
            FieldError fe = ex.getBindingResult().getFieldError();
            String msg = fe.getDefaultMessage();
            Locale locale = LocaleContextHolder.getLocale();
           // LocaleContextHolder.setLocale(Locale.ENGLISH);
            LocaleContextHolder.setLocale(Locale.US);
            locale = LocaleContextHolder.getLocale();
            String message = messageSource.getMessage(fe, LocaleContextHolder.getLocale());
            //String message = messageSource.getMessage(fe, Locale.ENGLISH);
            log.info("---MethodArgumentNotValidException Handler--- ERROR: {}",msg);
            result.setResultMsg(msg);
         //   List<ObjectError> errors =ex.getBindingResult().getAllErrors();
         //   StringBuffer errorMsg=new StringBuffer();
         //   errors.stream().forEach(x -> errorMsg.append(x.getDefaultMessage()).append(";"));
         //   log.error("---MethodArgumentNotValidException Handler--- ERROR: {}", errorMsg.toString());
        //    result.setResultMsg(errorMsg.toString());
    
            return result;
        }
    
        /**
                * 自定义异常
         */
        @ExceptionHandler(Exception.class)
        public ResponseDTO handleMgtInvalidParamException(Exception e, HttpServletRequest request) {
            ResponseDTO r = new ResponseDTO(ResponseCodeEnum.FAILED,null);
            return r;
        }
    }

6、切面 接口 ResponseBodyAdvice<Object> 的实现：

import com.nandao.i18n.dto.ResponseDTO;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.MessageSource;
    import org.springframework.context.support.ReloadableResourceBundleMessageSource;
    import org.springframework.core.MethodParameter;
    import org.springframework.http.MediaType;
    import org.springframework.http.converter.HttpMessageConverter;
    import org.springframework.http.server.ServerHttpRequest;
    import org.springframework.http.server.ServerHttpResponse;
    import org.springframework.web.bind.annotation.ControllerAdvice;
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;
    import org.springframework.web.servlet.support.RequestContext;
    
    import javax.servlet.http.HttpServletRequest;
    
    /**
     * 这里同时拦截控制层和全局异常类
     */
    @ControllerAdvice(basePackages={"com.nandao.i18n.controller","com.nandao.i18n.exception"})
    public class I18nResponseBodyAdvice implements ResponseBodyAdvice<Object>{
    
    	private MessageSource messageSource;
    	@Value("${spring.messages.basename}")
    	private String basename;
    
    	@Value("${spring.messages.cache-seconds}")
    	private long cacheMillis;
    
    	@Value("${spring.messages.encoding}")
    	private String encoding;
    
    	protected Logger log = LoggerFactory.getLogger(this.getClass());
    	
    	@Override
    	public Object beforeBodyWrite(Object obj, MethodParameter method,
    			MediaType type, Class<? extends HttpMessageConverter<?>> converter,
    			ServerHttpRequest request, ServerHttpResponse response) {
    		try {
    			if(obj instanceof ResponseDTO){
    				ResponseDTO result = (ResponseDTO) obj;
    				String resultCode = result.getResultCode();
    				if(resultCode!= null){
    					HttpServletRequest req = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
    					String i18nMsg = getMessage(req, resultCode);
    					if(null !=i18nMsg){
    						result.setResultMsg(i18nMsg);
    					}else {
    						log.info("采用上游的赋值");
    					}
    				}
    			}
    		} catch (Exception e) {
    			e.printStackTrace();
    			log.error("返回值国际化拦截异常",e);
    		}
    		return obj;
    	}
    
    	@Override
    	public boolean supports(MethodParameter arg0,
    			Class<? extends HttpMessageConverter<?>> arg1) {
    		return true;
    	}
    	
    	/**
    	 * 返回国际化的值
    	 * @param request
    	 * @param key
    	 * @return
    	 */
    	public String getMessage(HttpServletRequest request, String key){
            RequestContext requestContext = new RequestContext(request);
            String value = requestContext.getMessage(key);
            return value;
        }
    
    	/**
    	 * 初始化
    	 * @return
    	 */
    	private MessageSource initMessageSource() {
    		ReloadableResourceBundleMessageSource messageSource=new ReloadableResourceBundleMessageSource();
    		log.info("baseName====>:" + this.basename);
    		messageSource.setBasename(basename);
    		messageSource.setDefaultEncoding(encoding);
    		messageSource.setCacheMillis(cacheMillis);
    		return messageSource;
    	}
    
    	/**
    	 * 设置当前的返回信息,也可以使用
    	 * @param request
    	 * @param code
    	 * @return
    	 */
    	/*public String getMessage(HttpServletRequest request,String code){
    		if(messageSource==null){
    			messageSource=initMessageSource();
    		}
    		Request r = new Request();
    		String lauage=request.getHeader("accept-language");
    		//默认没有就是请求地区的语言
    		Locale locale=null;
    		if(lauage==null){
    			locale=request.getLocale();
    		}
    		else if("en".equals(lauage)){
    			locale=Locale.ENGLISH;
    		}
    		else if("ko".equals(lauage)){
    			locale=Locale.KOREAN;
    		}
    		else if("zh-CN".equals(lauage)){
    			locale=Locale.CHINA;
    		}
    		//其余的不正确的默认就是本地的语言
    		else{
    			locale=request.getLocale();
    		}
    		String result=null;
    		try {
    			result = messageSource.getMessage(code, null, locale);
    			//result = messageSource.getMessage(code, null, "en_US");
    		} catch (NoSuchMessageException e) {
    			log.error("Cannot find the error message of internationalization, return the original error message.");
    		}
    		if(result==null){
    			return code;
    		}
    		return result;
    	}
    */
    
    
    }

7、aspect切面的实现和6类似，二选一方案：

import com.nandao.i18n.constant.ResultEnglishMsg;
    import com.nandao.i18n.dto.ResponseDTO;
    import lombok.extern.slf4j.Slf4j;
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.annotation.AfterReturning;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Pointcut;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.MessageSource;
    import org.springframework.context.NoSuchMessageException;
    import org.springframework.context.support.ReloadableResourceBundleMessageSource;
    import org.springframework.stereotype.Component;
    import org.springframework.web.context.request.RequestAttributes;
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    
    import javax.servlet.http.HttpServletRequest;
    import java.util.Enumeration;
    import java.util.Objects;
    
    /**
     * @author wanghuainan
     * @date 2021/10/9
     */
    @Aspect
    @Slf4j
    @Component
    public class GlobalEnglishMsgAspect {
    
        private MessageSource messageSource;
    
        @Value("${spring.messages.basename}")
        private String basename;
    
        @Value("${spring.messages.encoding}")
        private String encoding;
    
    
        @Pointcut("execution(public * com.nandao.i18n.controller.*.*(..))")
        private void pointCut() {
        }
    
        @Pointcut("execution(public * com.nandao.i18n.exception.*.*(..))")
        private void pointExceptionCut() {
        }
    
        /**
         * 业务接口请求后统一处理错误状态码
         * @param joinPoint
         * @param returnVal
         */
        @AfterReturning(returning = "returnVal", pointcut = "pointCut()")
        public void doAftereReturning(JoinPoint joinPoint, Object returnVal) {
            commonReturning( joinPoint,  returnVal);
        }
    
        /**
         * 业务接口请求异常后统一处理错误状态码
         * @param joinPoint
         * @param returnExceptionVal
         */
        @AfterReturning(returning = "returnExceptionVal", pointcut = "pointExceptionCut()")
        public void doAftereExceptionReturning(JoinPoint joinPoint, Object returnExceptionVal) {
            commonReturning( joinPoint,  returnExceptionVal);
        }
    
        private void commonReturning(JoinPoint joinPoint, Object returnCommonVal) {
            String classMethod = null;
            if (returnCommonVal instanceof ResponseDTO) {
                ResponseDTO r = (ResponseDTO) returnCommonVal;
                /**
                 * 如果返回的是错误状态码，则需要判断是否需要转化成英文
                 */
                String returnCode = r.getResultCode();
                if (!returnCode.equals("100000")) {
                    classMethod = getClassMethodName(joinPoint);
                    boolean flag = checkHeaderName();
                    if (!flag) {
                        log.info("此接口[{}]返回的msg不需要转化为英文,,错误码[{}]", classMethod,returnCode);
                        return;
                    }
                    if (ResultEnglishMsg.codeList.contains(returnCode)) {
                        log.info("此接口[{}]特殊处理英文msg,错误码[{}]", classMethod,returnCode);
                        return;
                    }
                    log.info("此接口[{}]返回的msg需要转化为英文,,错误码[{}]", classMethod,returnCode);
                    HttpServletRequest req = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
                    String i18nMsg = getMessage(req, returnCode);//获取国际化配置
                    /**
                     * 英文提升如果为空，则还用原来的中文提升
                     */
                    if (Objects.nonNull(i18nMsg)) {
                        r.setResultMsg(i18nMsg);
                    } else {
                        log.info("英文提升为空，还用原来的中文提升,错误码code:[{}],接口名[{}]", returnCode, classMethod);
                    }
                }
            } else {
                classMethod = getClassMethodName(joinPoint);
                log.info("此接口[{}]返回的不是R对象，没有msg,不需要英文转化", classMethod);
            }
        }
    
        /**
         * 初始化
         * @return
         */
        private MessageSource initMessageSource() {
            ReloadableResourceBundleMessageSource messageSource=new ReloadableResourceBundleMessageSource();
            log.info("baseName====>:" + this.basename);
            messageSource.setBasename(basename);
            messageSource.setDefaultEncoding(encoding);
            return messageSource;
        }
    
        /**
         * 设置当前的返回信息
         * @param request
         * @param code
         * @return
         */
        public String getMessage(HttpServletRequest request,String code){
            if(messageSource==null){
                messageSource=initMessageSource();
            }
            String result=null;
            try {
                result = messageSource.getMessage(code, null, request.getLocale());
            } catch (NoSuchMessageException e) {
                log.error("Cannot find the error message of internationalization, return the original error message.[{}]",request.getRequestURI());
            }
            return result;
        }
    
        /**
         * 判断请求头的参数是否是国际版
         *
         * @return
         */
        private boolean checkHeaderName() {
            RequestAttributes ra = RequestContextHolder.getRequestAttributes();
            if (Objects.isNull(ra)) {
                log.info("服务里RequestAttributes对象为空");
                return false;
            }
            ServletRequestAttributes sra = (ServletRequestAttributes) ra;
            HttpServletRequest request = sra.getRequest();
            Enumeration<String> enumeration = request.getHeaderNames();
            while (enumeration.hasMoreElements()) {
                String name = enumeration.nextElement();
                String value = request.getHeader(name);
                if (name.equals("accept-language") && value.equals("en")) {
                    return true;
                }
            }
            return false;
        }
    
        /**
         * 获取请求的方法名称
         *
         * @param joinPoint
         * @return
         */
        private String getClassMethodName(JoinPoint joinPoint) {
            /**
             * 如果服务中所有的控制层接口名被代理，只能取uri;
             */
            ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            if (Objects.nonNull(requestAttributes)) {
                HttpServletRequest request = requestAttributes.getRequest();
                return request.getRequestURI();
            }
            //如果是子线程的话，会走下面这种情况
            log.info("classMethod={}", joinPoint.getSignature().getDeclaringTypeName());
            String declaringTypeName = joinPoint.getSignature().getDeclaringTypeName();
            String className = declaringTypeName.substring(declaringTypeName.lastIndexOf(".") + 1);
            log.info("className={}；Method={}", className, joinPoint.getSignature().getName());
            return className + "." + joinPoint.getSignature().getName();
        }
    
    }

8、VO 和控制层代码的实现：

import lombok.Data;
    import org.hibernate.validator.constraints.NotEmpty;
    
    import javax.validation.constraints.Size;
    
    /**
     * @author wanghuainan
     * @date 2021/10/15
     */
    @Data
    public class UserInfo {
        //@Size(min = 1, max = 10, message = "姓名长度必须为1到10")
       // @NotEmpty(message = "{user.name.notBlank}")
        @NotEmpty(message = "{demo.key.null}")//必须配置地址，保证不能错：basename: static/i18n/messages
        //@NotEmpty()
        private String name;
    }

控制层：

@PostMapping("/validate1")
    	@ResponseBody
    	public ResponseDTO validate1(@Valid @Validated @RequestBody UserInfo user) throws Exception {
    		Map<String,Object> map = new HashMap<String, Object>();
    		map.put("key", "这里就是数据了");
             //动态传参
    		String message = messageSource.getMessage("1000", new Object[]{"nandao","128"}, LocaleContextHolder.getLocale());
    		System.out.println("国际化后的参数"+message);
    		if("nandao".equals(user.getName())){
    			throw new Exception("抛出异常！！！");
    		}
    		return new ResponseDTO(ResponseCodeEnum.SUCCESS,map);
    	}

9、启动服务后依次访问接口验证：[http://localhost:8080/api/validate1][http_localhost_8080_api_validate1]

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAbmFuZGFvMTU4_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

多角度，正常、异常、参数非空校验、动态传参、两种切面均可以测试。

到此，参数国际化实战分享完毕，核心伪代码都贴出来了，有不明白的地方可以留言关注，积极反馈！

[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAbmFuZGFvMTU4_size_20_color_FFFFFF_t_70_g_se_x_16]: /images/20220828/4209facce7e44869919738b43a5200ba.png
[http_localhost_8080_api_validate1]: http://localhost:8080/api/validate1
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAbmFuZGFvMTU4_size_20_color_FFFFFF_t_70_g_se_x_16 1]: /images/20220828/c42468adaf9541e78aad5bc02f3068e9.png