定义Threadlocal工具类使用拦截器统一释放资源
2023-12-25 11:55:51
一、ThreadLocalUtil 工具类定义
import java.util.HashMap;
import java.util.Map;
public class ThreadLocalUtil {
private static final ThreadLocal<Map<String, Object>> threadLocal = ThreadLocal.withInitial(() -> new HashMap<>(10));
public static Map<String, Object> getThreadLocal() {
return threadLocal.get();
}
public static Object get(String key) {
Map<String, Object> map = threadLocal.get();
return map.get(key);
}
public static void set(String key, Object value) {
Map<String, Object> map = threadLocal.get();
map.put(key, value);
}
public static void set(Map<String, Object> keyValueMap) {
Map<String, Object> map = threadLocal.get();
map.putAll(keyValueMap);
}
public static void remove() {
threadLocal.remove();
}
public static <T> T remove(String key) {
Map<String, Object> map = threadLocal.get();
return (T) map.remove(key);
}
}
二、定义拦截器释放资源
释放资源常见的我们可以定义一个拦截器,在afterCompletion方法(方法执行完成,页面渲染以后执行,或者方法执行失败执行)中去释放资源,避免内存溢出
定义拦截器:
@Component
public class xxxInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
ThreadLocalUtil.remove();
}
}
把拦截器放到容器中:
@Configuration
public class AdminWebConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new xxxInterceptor())
.addPathPatterns("/**")
.excludePathPatterns("/","/login","/css/**","/fonts/**","/images/**","/js/**"); //放行的请求
}
}
备注:
withInitial方法是
ThreadLocal
类的一个静态方法,用于创建一个带有初始值的
ThreadLocal
对象(SuppliedThreadLocal)。参数是一个Supplier接口,Supplier的生产者意思,接受一个Lambda的函数。返回一个值
public static <S> ThreadLocal<S> withInitial(Supplier<? extends S> supplier) {
return new SuppliedThreadLocal<>(supplier);
}
使用WebMvcConfigurationSupport有误导致自定义的WebMvcConfigurer失效
文章来源:https://blog.csdn.net/QJY1437758743/article/details/135194024
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