我正在尝试学习 Spring MVC 并创建了一个休息服务,但我遇到了 bean Autowiring 问题。
Could not autowire field: taxApp.dao.daoImpl.userDaoImpl taxApp.controller.loginController.userService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [taxApp.dao.daoImpl.userDaoImpl] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency
我的 spring 项目的结构如下所示
src
main
java
taxApp
controller
loginController.java
model
user.java
dao
daoImpl
userDaoImpl.java
userDAO.java
resources
database
data-source-cfg.xml
user
spring-user.xml
spring-module.xml
webapp
web-inf
dispatcher-servlet.xml
web.xml
index.jsp
以下是文件的样子
dispatcher-servlet.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
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
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<mvc:annotation-driven/>
<context:component-scan base-package="taxApp" />
<context:annotation-config />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/pages/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
spring-user.xml
<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-2.5.xsd">
<bean id="userDAO" class="dao.impl.userDaoImpl">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
spring-module.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">
<!-- Using Oracle datasource -->
<import resource="database/data-source-cfg.xml" />
<import resource="dao/spring-user.xml" />
</beans>
所有其他实现(例如 Controller 、DAO、服务和模型)看起来像
loginController.java
@RestController
public class loginController {
@Autowired
userDaoImpl userService; //Service which will do all data retrieval/manipulation work
//other methods
}
userDAO.java
public interface userDAO {
public void insert(user _user);
public user findUserByEmail(String email);
}
userDaoImpl.java
public class userDaoImpl implements userDAO{
private DataSource dataSource;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
//other methods
}
最佳答案
将您的 daoimpl 标记为
@存储库 公共(public)类 userDaoImpl 实现 userDAO{}
Autowire 接口(interface)而不是标记一个具体的类。 使用java配置使Spring应用程序更容易理解。
关于java - 无法 Autowiring Spring ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37506321/