我在运行我的第一个 spring 示例代码时遇到了这个错误。貌似spring没有
以某种方式重新识别一个 bean，但我不知道为什么。我制作了一个 bean 定义文件并在那里添加了一个 bean。
然后我将该文件定位到 WEBINF 文件夹下。假设这应该没有任何问题，但看起来
好像我在这里遇到了一些问题。下面是我的 bean 定义文件和 jsp。谁能告诉我
我做错了什么？
applicationContext.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.xsd">
<bean id="HelloSpring" class="com.spring.toby.HelloSpring"></bean>
</beans>
HelloSpring.java
package com.spring.toby;
public class HelloSpring {
public String sayHello(String name){
return "Hello " + name;
}
}
HelloSpring.jsp
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<%@ page import="org.springframework.context.ApplicationContext" %>
<%@ page import="org.springframework.web.context.support.WebApplicationContextUtils" %>
<%@ page import="com.spring.toby.HelloSpring" %>
<!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=EUC-KR">
<title>Insert title here</title>
</head>
<body>
<%
ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(
request.getSession().getServletContext());
out.println("check");
HelloSpring helloSpring = context.getBean(HelloSpring.class);
//out.println(helloSpring.sayHello("seho"));
%>
</body>
</html>
网络.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee /web-app_2_5.xsd">
<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/root-context.xml</param-value>
</context-param>
<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Processes application requests -->
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
这是我的错误日志
org.apache.jasper.JasperException: 在第 17 行处理 JSP 页面/WEB-INF/views/hellospring.jsp 时发生异常
14: ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(
15: request.getSession().getServletContext());
16: out.println("检查");
17: HelloSpring helloSpring = context.getBean(HelloSpring.class);
18:
19://out.println(helloSpring.sayHello("seho"));
20: %>
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1157)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:927)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [com.spring.toby.HelloSpring] is defined: expected single bean but found 0:
org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:271)
org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1101)
org.apache.jsp.WEB_002dINF.views.hellospring_jsp._jspService(hellospring_jsp.java:81)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1157)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:927)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
最佳答案
您需要添加 applicationContext.xml在 contextConfigLocation
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/root-context.xml,
/WEB-INF/spring/applicationContext.xml
</param-value>
</context-param>
或者，您也可以使用 <import:resource> 从另一个文件导入 bean 定义。 xml文件中的标签
建议
将逻辑放在 Controller (Servlet、 Controller 类..)而不是 JSP 上是一种很好的做法
关于java - org.springframework.beans.factory.NoSuchBeanDefinitionException异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10680975/