我正在尝试为学习目的开发一个spring-mvc 3 web应用程序。 作为一个新手我不是很好春天mvc。e的数据源不注入@controller在spring-mvc 3
所以这里是我的AdminDAO.java的数据源总是返回@Controller类空问题
@Controller
public class adminPanel {
@Autowired
IAdminServices adminDAO;
@RequestMapping(value={"/adminPanel.spring"},method=RequestMethod.GET)
public String execute(@ModelAttribute Login login){
return "adminpanel";
....
}
这里的数据源总是以空
注入她是我的应用程序上下文
<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="datasource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.postgresql.Driver" />
<property name="url" value="jdbc:postgresql://localhost:5432/librarysystem" />
<property name="username" value="postgres" />
<property name="password" value="postgres" />
</bean>
<bean id="adminDAO" class="in.kailash.DAO.AdminDAO">
<property name="dataSource" ref="datasource" />
</bean>
</beans>
my IAdminServices.java
@Component
public interface IAdminServices {
public String save(User user);
public String delete(User user,String id);
public String edit(User user,String id);
public List<User> viewAll();
public String issue();
public String returnBook();
public String getStudentCardNumber();
}
AdminDAO类实现IAdminServices.java
@Service
public class AdminDAO implements IAdminServices {
DataSource dataSource;
public AdminDAO() {
super();
}
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
@Override
public String save(User user) {
try {
Connection con = dataSource.getConnection();
String sql = "insert into borrower(cardno,name,address,phone) VALUES(?,?,?,?)";
...
....
}
这里是我的MVC-servlet.xml中
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:component-scan base-package="in.kailash" />
<context:annotation-config/>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsps/" />
<property name="suffix" value=".jsp"/>
</bean>
</beans>
,这里是我的web.xml
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" 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>LibSys</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>maincontroller</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>maincontroller</servlet-name>
<url-pattern>*.spring</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/maincontroller-servlet.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
我的主要问题是,我总是得到datasource在@controller类中为null。 因为我是新手,所以欢迎任何有关如何安排Spring-mvc课程的进一步意见。
在此先感谢。
@Sotirios感谢您的耐心回复。根据你的建议,我已经在我的
的web.xml
做变化
<?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"
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>LibSys</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>maincontroller</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/maincontroller-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>maincontroller</servlet-name>
<url-pattern>*.spring</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationcontext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
不知怎的,数据源现在正注入。我只想确认一下,我这次做了这件事。如果你发现我的包中安排有任何问题,那么请评论
亲爱的谢谢我AdminDAO是in.kailash.DAO包的内部,从我AdminDAO取出@services后得来的异常 BeanCreationException:创建名为'adminPanel'的bean时出错:注入自动装配依赖失败;嵌套异常是org.springframework.beans.factory.BeanCreationException:无法自动装入字段:in.kailash.services.IAdminServices in.kailash.controller.adminPanel.adminDAO;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException:没有合格的bean类型[in.kailash.services.IAdminServices] – Adhikari 2014-10-11 17:44:20
@ R's你能编辑你的问题并添加你的web.xml吗?你在哪里声明你的应用程序上下文? – 2014-10-11 17:46:52
@ R的确定,所以现在没有任何意义。 'mvc-servlet.xml'是否意味着'maincontroller-servlet.xml'?无论如何,你的'DispatcherServlet'应该加载'mvc-servlet.xml'(或wtv),并且'ContextLoaderListener'应该加载应用程序上下文。 – 2014-10-11 17:53:03