我查看源码发现springboot中有定义好了的线程还有线程池,下面这个类就是关于请求的线程,我们通过线程拿到请求对象,这个线程在用户有效连接服务器就在,所以用户在线的状态下,这个线程必然存在,通过调用((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest()就可以拿到线程中的请求对象,有了这个对象,就可以进一步拿到HttpSession类的对象,那就可以拿到当前账号信息了。
package org.springframework.web.context.request; import javax.faces.context.FacesContext; import org.springframework.core.NamedInheritableThreadLocal; import org.springframework.core.NamedThreadLocal; import org.springframework.lang.Nullable; import org.springframework.util.ClassUtils; public abstract class RequestContextHolder { private static final boolean jsfPresent = ClassUtils.isPresent("javax.faces.context.FacesContext", RequestContextHolder.class.getClassLoader()); private static final ThreadLocal<RequestAttributes> requestAttributesHolder = new NamedThreadLocal("Request attributes"); private static final ThreadLocal<RequestAttributes> inheritableRequestAttributesHolder = new NamedInheritableThreadLocal("Request context"); public RequestContextHolder() { } public static void resetRequestAttributes() { requestAttributesHolder.remove(); inheritableRequestAttributesHolder.remove(); } public static void setRequestAttributes(@Nullable RequestAttributes attributes) { setRequestAttributes(attributes, false); } public static void setRequestAttributes(@Nullable RequestAttributes attributes, boolean inheritable) { if (attributes == null) { resetRequestAttributes(); } else if (inheritable) { inheritableRequestAttributesHolder.set(attributes); requestAttributesHolder.remove(); } else { requestAttributesHolder.set(attributes); inheritableRequestAttributesHolder.remove(); } } @Nullable public static RequestAttributes getRequestAttributes() { RequestAttributes attributes = (RequestAttributes)requestAttributesHolder.get(); if (attributes == null) { attributes = (RequestAttributes)inheritableRequestAttributesHolder.get(); } return attributes; } public static RequestAttributes currentRequestAttributes() throws IllegalStateException { RequestAttributes attributes = getRequestAttributes(); if (attributes == null) { if (jsfPresent) { attributes = RequestContextHolder.FacesRequestAttributesFactory.getFacesRequestAttributes(); } if (attributes == null) { throw new IllegalStateException("No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request."); } } return attributes; } private static class FacesRequestAttributesFactory { private FacesRequestAttributesFactory() { } @Nullable public static RequestAttributes getFacesRequestAttributes() { FacesContext facesContext = FacesContext.getCurrentInstance(); return facesContext != null ? new FacesRequestAttributes(facesContext) : null; } } }
@Component public class LogInThread { public static HttpServletRequest getRequest(){ return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); } }
@Controller @RequestMapping("/user") public class UserController { @Autowired private UserService userService; @PostMapping("/login") public @ResponseBody ResultUtil login(@RequestBody HashMap map, HttpSession session){ String name=(String)map.get("name"); String pass=(String)map.get("pass"); if(userService.login(name,pass,session)){ return new ResultUtil(200,"Success"); }else{ return new ResultUtil(200,"账号或密码错误"); } } @PostMapping("/test") public @ResponseBody String deleteUser(){ HttpSession session=LogInThread.getRequest().getSession(); System.out.println(session.getAttribute(session.getId())); return session.getAttribute(session.getId()) } }