caijian_的博客

1、使用HttpServletRequest获取@RequestMapping("/login.do") public String login(HttpServletRequest request){ String name = request.getParameter("name") String pass = request.getParameter("p

错误代码（贴的前部分）：org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'itemService': Injection of autowired dependencies failed; nested exception is org.springframework.

1. 用户发送请求至前端控制器DispatcherServlet2. DispatcherServlet收到请求调用HandlerMapping处理器映射器。3. 处理器映射器根据请求url找到具体的处理器，生成处理器对象及处理器拦截器(如果有则生成)一并返回给DispatcherServlet。4. DispatcherServlet通过HandlerAdapter处理器适配器调用处

@Controller在SpringMVC 中，控制器Controller 负责处理由DispatcherServlet 分发的请求，它把用户请求的数据经过业务处理层处理之后封装成一个Model ，然后再把该Model 返回给对应的View 进行展示。在SpringMVC 中提供了一个非常简便的定义Controller 的方法，你无需继承特定的类或实现特定的接口，只需使用@Controller

No EntityManager with actual transaction available for current thread - cannot reliably process 'merge' call; nested exception is javax.persistence.TransactionRequiredException: No EntityManager with ...

Servlet.service() for servlet [springServlet] in context with path [] threw exception [Handler processing failed; nested exception is java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config...