Question

当我运行我的第一个春天示例代码时出现此错误。看起来春天不是

以某种方式重新调整bean，但我不知道为什么。我创建了一个bean定义文件并在那里添加了一个bean。

然后我将该文件放在WEBINF文件夹下。假设这应该没有任何问题，但看起来

像我在这里遇到一些问题一样。下面是我的bean定义文件和jsp。任何人都可以告诉我

我做错了什么？

的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>

的web.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（“check”）; 17：HelloSpring helloSpring = context.getBean（HelloSpring.class）; 18：
19：//out.println(helloSpring.sayHello("seho“））; 20：％＆gt;

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)

Answer 1

您需要在contextConfigLocation

中添加applicationContext.xml

<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xml文件中的<import:resource>标记从另一个文件导入bean defination

<强>建议

最好将逻辑放在控制器（Servlet，Controller Classes ..）上而不是JSP

上

org.springframework.beans.factory.NoSuchBeanDefinitionException

1 个答案: