common包下ApplicationContextHelper HttpInterceptor

最新推荐文章于 2024-10-18 14:53:31 发布

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#ApplicationContext #spring上下文和拦截器 #HttpInterceptor

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本文介绍了一个Spring应用上下文辅助类ApplicationContextHelper的设计与实现，该类用于方便地获取Spring容器中的bean实例。此外，还展示了如何通过HttpInterceptor进行请求拦截处理，包括请求开始与结束时的日志记录。

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applicationContextHelper

@Component("applicationContextHelper")
public class ApplicationContextHelper implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    public void setApplicationContext(ApplicationContext context) throws BeansException {
        applicationContext = context;
    }

    public static <T> T popBean(Class<T> clazz) {
        if (applicationContext == null) {
            return null;
        }
        return applicationContext.getBean(clazz);
    }

    public static <T> T popBean(String name, Class<T> clazz) {
        if (applicationContext == null) {
            return null;
        }
        return applicationContext.getBean(name, clazz);
    }
}

ApplicationContext.xml配置bean

 <bean class="com.mmall.common.ApplicationContextHelper" lazy-init="false" /> <!-- 从spring-servlet.xml里转移过来的 启动时直接加载-->

测试

SysAclModuleMapper moduleMapper = ApplicationContextHelper.popBean(SysAclModuleMapper.class);
        SysAclModule module = moduleMapper.selectByPrimaryKey(1);

HttpInterceptor

@Slf4j
public class HttpInterceptor extends HandlerInterceptorAdapter {

    private static final String START_TIME = "requestStartTime";

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String url = request.getRequestURI().toString();
        Map parameterMap = request.getParameterMap();
//        log.info("request start. url:{}, params:{}", url, JsonMapper.obj2String(parameterMap));
        long start = System.currentTimeMillis();
        request.setAttribute(START_TIME, start);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
//        String url = request.getRequestURI().toString();
//        long start = (Long) request.getAttribute(START_TIME);
//        long end = System.currentTimeMillis();
//        log.info("request finished. url:{}, cost:{}", url, end - start);
        removeThreadLocalInfo();
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        String url = request.getRequestURI().toString();
        long start = (Long) request.getAttribute(START_TIME);
        long end = System.currentTimeMillis();
//        log.info("request completed. url:{}, cost:{}", url, end - start);

        removeThreadLocalInfo();
    }

    public void removeThreadLocalInfo() {
        RequestHolder.remove();;
    }
}

spring-servlet.xml配置 interceptors

    <mvc:interceptors>
        <bean class="com.mmall.common.HttpInterceptor" />
    </mvc:interceptors>