spring boot 拦截器增加语言信息

系统需要识别当前语言。没有在系统中找到现有实现，自己加了一个。

创建语言拦截器 LanguageInterceptor

import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class LanguageInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request,HttpServletResponse response,Object handler) {// 获取语言标识（优先级：参数 > 请求头 > 默认值）String lang = request.getParameter("lang");  // 从URL参数获取if (lang == null) {lang = request.getHeader("Accept-Language");  // 从请求头获取}if (lang == null || lang.isEmpty()) {lang = "zh_CN";  // 设置默认语言}// 将语言信息存储到request属性中request.setAttribute("lang", lang);return true;}
}

在系统的Configuration文件中添加语言拦截器

public void addInterceptors(InterceptorRegistry registry){registry.addInterceptor(new LanguageInterceptor());
}

使用时接口中注入参数

 @RequestAttribute(value = "lang", required = false) String lang 

前端在请求头中加入语言

// request拦截器
service.interceptors.request.use(// 设置语言// 添加 Accept-Language 请求头config.headers['Accept-Language'] = getLang()const method = config.method?.toUpperCase()// 防止 GET 请求缓存if (method === 'GET') {config.headers['Cache-Control'] = 'no-cache'config.headers['Pragma'] = 'no-cache'}// 自定义参数序列化函数else if (method === 'POST') {const contentType = config.headers['Content-Type'] || config.headers['content-type']if (contentType === 'application/x-www-form-urlencoded') {if (config.data && typeof config.data !== 'string') {config.data = qs.stringify(config.data)}}}return config},(error: AxiosError) => {// Do something with request errorconsole.log(error) // for debugreturn Promise.reject(error)}
)