我是个spring新手遇到点问题,请各位帮忙解决下

Question

public class StudentBusinessImpl implements IstudentBusiness {    private StudentDAO studentdao;    public void setStudentdao(StudentDAO studentdao) {
        this.studentdao = studentdao;
    }    public StudentDAO getStudentdao() {
        return studentdao;
    } <bean id="jdbcTemplate"  class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource" />
    </bean>    <bean id="studentBusiness" class="com.demo.my.business.impl.StudentBusinessImpl">
        <property name="studentdao" ref="notallkown"/>
    </bean>
    
    <bean  id="studentDAO" class="com.demo.my.dao.impl.StudentDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean>  public static void main(String[] args) {
        getInfo();
    }    public static void getInfo() {
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        IstudentBusiness studentB= (IstudentBusiness) ac.getBean("studentBusiness");
        Student students = studentB.getInfo(111);        System.out.print(students.getName() + "\n" + students.getStuID());    } 运行后报错:Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'studentBusiness' is defined我不知道该怎么解决了!

Answer 1

StudentBusinessImpl是com.demo.my.business.impl下吗？

Answer 2

    <bean id="studentBusiness"      class="com.demo.my.business.impl.StudentBusinessImpl"> 
        <property name="studentdao" ref="studentDAO"/> 
    </bean> 
    
    <bean  id="studentDAO" class="com.demo.my.dao.impl.StudentDaoImpl"> 
        <property name="jdbcTemplate" ref="jdbcTemplate"/> 
    </bean> try it now!

Answer 3

<property name="studentdao" ref="notallkown"/> 注入的类对吗？
加载applicationContext.xml没报错？

Answer 4

<bean id="studentBusiness" class="com.demo.my.business.impl.StudentBusinessImpl">
        <property name="studentdao" ref="notallkown"/>
</bean>红色部分的哪来的 ，改为ref="studentDAO" 

Answer 5

我已近找到错误了
原来我有两个applicationContext.xml
一个在web-inf下
一个在更目录下!
里面的内容不一样!读取了我没有配置的那个applicationContext.xml

Answer 6

<bean id="studentBusiness" class="com.demo.my.business.impl.StudentBusinessImpl">
        <property name="studentdao" ref="studentdao"/>
    </bean>
   
    <bean  id="studentdao" class="com.demo.my.dao.impl.StudentDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean> 

Answer 7

 <bean id="StudentBusinessImpl "class="com.demo.my.business
        .impl.StudentBusinessImpl"> 
        <property name="studentdao" ref="notallkown"/> 
 </bean> 
替换你的试一下