Question

如何用Spring将Service注入到Servlet中

Answer 1

在applicationContext.xml中定义数据层访问Bean：

<bean id="userDao" class="test.UserDaoImpl"></bean>

public class MyServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

private UserDao userDao;
....
}

注入方法：：在Servlet的init方法中增加以下代码：
public void init(ServletConfig config) throws ServletException {
SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,
config.getServletContext());
}

并且在变量userDao上一行增加@Autowired：

<a href="https://www.baidu.com/s?wd=%40Autowired&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1YznAf1nHwhP1f1nymsPvcz0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPHmknj0vPjcdPWbYn1DvPHmY" target="_blank" class="baidu-highlight">@Autowired</a>
private UserDao userDao;