未找到 WebApplicationContext:未注册 ContextLoaderListener? [英] No WebApplicationContext found: no ContextLoaderListener registered?
问题描述
我正在尝试创建一个简单的 Spring 3 应用程序并拥有以下文件.请告诉我这个错误的原因
I'm trying to create a simple Spring 3 application and have the following files. Please tell me the reason for this error
下面是我的 web.xml
Below is my web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>Spring2</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
下面是我的 index.jsp
Below is my index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Index Page<br/>
<form:form commandName="loginBean" method="POST" action="login">
<form:input path="userName" id="userName"/><br/>
<form:input path="password" id="password"/><br/>
<input type="submit" value="submit"/>
</form:form>
<a href="register.jsp">Go to Registration Page</a>
</body>
</html>
下面是我的 dispatcher-servlet.xml
Below is my dispatcher-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/" />
<property name="suffix" value=".jsp" />
</bean>
<bean name="/login" class="com.infy.controller.LoginController"/>
</beans>
这是 LoginController.java
This is the LoginController.java
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class LoginController {
@RequestMapping(value="/login", method=RequestMethod.POST)
public ModelAndView loginAction(@ModelAttribute("loginBean")LoginBean bean){
return new ModelAndView("success", "success", "Successful Login");
}
}
最后是我的 LoginBean
And finally my LoginBean
public class LoginBean {
private String userName;
private String password;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
推荐答案
您的 web.xml 中必须有一个 ContextLoaderListener - 它会加载您的配置文件.
You'll have to have a ContextLoaderListener in your web.xml - It loads your configuration files.
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
您需要了解 Web 应用程序上下文和根应用程序上下文之间的区别.
You need to understand the difference between Web application context and root application context .
在web MVC框架中，每个DispatcherServlet都有自己的WebApplicationContext，它继承根 WebApplicationContext 中已经定义的所有 bean.这些继承定义的 bean 可以在特定于 servlet 的范围中被覆盖，并且新的特定于范围的可以在给定 servlet 实例的本地定义 bean.
In the web MVC framework, each DispatcherServlet has its own WebApplicationContext, which inherits all the beans already defined in the root WebApplicationContext. These inherited beans defined can be overridden in the servlet-specific scope, and new scope-specific beans can be defined local to a given servlet instance.
调度程序 servlet 的应用程序上下文是一个仅适用于 Web 类的 Web 应用程序上下文.您不能将这些用于您的中间层.这些需要使用 ContextLoaderListener 的全局应用上下文.
The dispatcher servlet's application context is a web application context which is only applicable for the Web classes . You cannot use these for your middle tier layers . These need a global app context using ContextLoaderListener .
阅读 spring 参考 这里.
Read the spring reference here for spring mvc .
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