Custom filters and interceptors implement ThreadLocal thread closure

线程封闭

线程封闭一般通过以下三个方法：

1. Ad-hoc线程封闭：程序控制实现,最糟糕,忽略
2. 堆栈封闭：局部变量,无并发问题
3. ThreadLocal线程封闭：特别好的封闭方法

方法2是最常用的,变量定义在接口内,本文主要讲解方法三,SpringBoot项目通过自定义过滤器和拦截器实现ThreadLocal线程封闭.实现Filter接口自定义过滤器和继承HandlerInterceptorAdapter自定义拦截器.

ThreadLocal线程封闭实现步骤

封装ThredLocal的方法

/**
 * <p>自定义RequestHolder</p></p>
 *
 * @Author zjq
 * @Date 2021/12
 */
public class RequestHolder {

    private final static ThreadLocal<Long> requestHolder = new ThreadLocal<>();

    public static void set(Long id) {
        requestHolder.set(id);
    }

    public static Long get() {
        return requestHolder.get();
    }

    public static void remove() {
        requestHolder.remove();
    }

}
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自定义过滤器

自定义定义拦截器继承Filter接口,实现ThredLocal.add()方法

/**
 * <p>自定义过滤器</p>
 *
 * @Author zjq
 * @Date 2021/12/7
 */
@Slf4j
public class HttpFilter implements Filter {

    /**
     * 为Filter初始化 提供支持
     *
     * @param filterConfig
     * @throws ServletException
     */
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    /**
     * 拦截到要执行的请求时,doFilter就会执行.这里我们可以写对请求和响应的预处理.
     * FilterChain把请求和响应传递给下一个 Filter处理
     *
     * @param servletRequest
     * @param servletResponse
     * @param filterChain
     * @throws IOException
     * @throws ServletException
     */
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //把普通servlet强转成httpServlet
        HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
        Long threadId = Thread.currentThread().getId();
        log.info("do filter,threadId:{} servletPath:{}", threadId, httpServletRequest.getServletPath());
        //把当前线程id放入requestHolder
        RequestHolder.set(threadId);
        //放行
        filterChain.doFilter(httpServletRequest, servletResponse);
    }

    /**
     * Filter 实例销毁前的准备工作
     */
    @Override
    public void destroy() {

    }
}
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自定义拦截器

自定义拦截器在线程使用完毕后移除ThredLocal中内容,避免内存溢出

/**
 * <p>自定义拦截器</p>
 *
 * @Author zjq
 * @Date 2021/12/7
 */
@Slf4j
public class HttpInterceptor extends HandlerInterceptorAdapter {

    /**
     * 拦截处理程序的执行.在 HandlerMapping 确定合适的处理程序对象之后,在 HandlerAdapter 调用处理程序之前调用.
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("preHandle执行...");
        return true;
    }

    /**
     * 请求处理完成后（渲染视图后）的回调.将在处理程序执行的任何结果上调用,从而允许进行适当的资源清理.
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        RequestHolder.remove();
        log.info("afterCompletion执行...");
        return;
    }
}
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Application类启动类中配置自定义过滤器和拦截器

/**
 * 
 * @author zjq
 */
@SpringBootApplication
public class Application extends WebMvcConfigurationSupport {

    public static void main(String[] args) {
        SpringApplication.run(ConcurrencyApplication.class, args);
    }

    /**
     * 自定义过滤器
     * @return
     */
    @Bean
    public FilterRegistrationBean filterRegistrationBean(){
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new HttpFilter());
        //设置自定义过滤器拦截的url
        filterRegistrationBean.addUrlPatterns("/threadLocal/*");
        return filterRegistrationBean;
    }

    /**
     * 定义自定义拦截器原先需要继承WebMvcConfigurerAdapter
     * SpringBoot2.0后WebMvcConfigurerAdapter被定义成过时了,推荐使用继承WebMvcConfigurationSupport
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new HttpInterceptor()).addPathPatterns("/**");
    }
}
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定义调用接口

/**
 * ThreadLocal测试controller
 * @author zjq
 */
@Controller
@RequestMapping("/threadLocal")
public class ThreadLocalController {

    @RequestMapping("/test")
    @ResponseBody
    public Long test() {
        return RequestHolder.get();
    }
}
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请求访问验证

访问调用接口,控制台输出如下：

本文内容到此结束了,