servlet 中获取 spring 管理的 bean

最新推荐文章于 2022-08-01 16:56:37 发布

原创最新推荐文章于 2022-08-01 16:56:37 发布 · 1w 阅读

2 ·

CC 4.0 BY-SA版权

文章标签：

#servlet #spring #bean

WEB开发专栏收录该内容

13 篇文章

订阅专栏

本文展示了一个使用Spring MVC框架的用户服务Servlet示例。该Servlet通过获取Spring应用上下文来注入用户服务，并调用其获取用户信息的方法。示例中包含了如何在Servlet中与Spring集成的具体步骤。

package spring.servlets;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import spring.beans.User;
import spring.services.UserServices;

@WebServlet("/UserServlet")
public class UserServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	private UserServices userServices;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//获取ServletContext 再获取 WebApplicationContextUtils
		ServletContext servletContext = this.getServletContext();
		WebApplicationContext context = 
				WebApplicationContextUtils.getWebApplicationContext(servletContext);
		userServices = (UserServices) context.getBean("userServices");
		
		System.out.println("--------------------------");
		User u = userServices.getUser();
		System.out.println(u.getUserName());
		System.out.println(u.getPassword());
		System.out.println("--------------------------");
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request, response);
	}
}