照着网上搭建ssh框架整合Spring时候报空指针！求指导


applicationContext.xmlstruts.xmlaction.java
public class EmployeeAction {
EmployeeService employeeService;

public void setEmployeeService(EmployeeService employeeService){
this.employeeService = employeeService;
}

public String save(){
System.out.println("action执行了");
employeeService.saveEmployee();
return "success";
}
}
service.java
public class EmployeeService {
EmployeeDao employeeDao;

public void setEmployeeDao(EmployeeDao employeeDao){
this.employeeDao = employeeDao;
}
public void saveEmployee() {
System.out.println("Service执行了");
employeeDao.saveEmployee();
}
}
dao.java
public class EmployeeDao { public void saveEmployee() {
System.out.println("Dao执行了");
}
}