SpringMVC启动后自动执行
来源:互联网 发布:郑州传智播客开java 编辑:程序博客网 时间:2024/06/10 08:17
参考:http://kylin755.iteye.com/blog/1703542
通常做法是定义一个Servlet,并在web.xml中配置Servlet的启动顺序<load-on-startup>的值在DispatcherServlet之后。但这样做的缺点是在Servlet中无法使用Spring的依赖注入功能,只能使用WebApplicationContext的getBean()方法获取bean。
找到的解决办法如下:
1、自定义一个用于代理启动Servlet的类DelegatingServletProxy:
- package com.test.common.util;
- import java.io.IOException;
- import javax.servlet.GenericServlet;
- import javax.servlet.Servlet;
- import javax.servlet.ServletException;
- import javax.servlet.ServletRequest;
- import javax.servlet.ServletResponse;
- import org.springframework.web.context.WebApplicationContext;
- import org.springframework.web.context.support.WebApplicationContextUtils;
- public class DelegatingServletProxy extends GenericServlet {
- private String targetBean;
- private Servlet proxy;
- @Override
- public void service(ServletRequest arg0, ServletResponse arg1)
- throws ServletException, IOException {
- proxy.service(arg0, arg1);
- }
- @Override
- public void init() throws ServletException {
- this.targetBean = getServletName();
- getServletBean();
- proxy.init(getServletConfig());
- }
- private void getServletBean() {
- WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
- this.proxy = (Servlet)wac.getBean(targetBean);
- }
- }
2、编写启动Servlet:
- package com.test.common.util;
- import java.io.IOException;
- import java.util.List;
- import javax.annotation.Resource;
- import javax.servlet.ServletConfig;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import org.springframework.stereotype.Component;
- import cn.edu.swu.oa.agency.model.Department;
- import cn.edu.swu.oa.agency.model.Group;
- import cn.edu.swu.oa.agency.service.DepService;
- import cn.edu.swu.oa.agency.service.GroService;
- import cn.edu.swu.oa.common.model.SysCode;
- import cn.edu.swu.oa.safe.model.User;
- import cn.edu.swu.oa.safe.service.UserService;
- /**
- *
- *
- * 类型解释:Spring启动完成后执行初始化操作
- * 类型表述:预读某些实体的Key-Value,放入map,方便以后使用
- * @author
- * @version
- *
- */
- @Component("initialServlet")
- public class InitialServlet extends HttpServlet {
- private static final long serialVersionUID = 1L;
- @Resource
- private UserService userService;
- @Resource
- private DepService depService;
- @Resource
- private GroService groService;
- /**
- * @see HttpServlet#HttpServlet()
- */
- public InitialServlet() {
- super();
- }
- /**
- * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
- */
- protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- }
- /**
- * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
- */
- protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- // TODO Auto-generated method stub
- }
- @Override
- public void init(ServletConfig config) throws ServletException {
- //初始化eserMap
- List<User> users = userService.getUsers();
- for(int i = 0; i < users.size(); i++) {
- User user = users.get(i);
- Integer userId = user.getUserId();
- String userName = user.getUserName();
- SysCode.userMap.put(userId, userName);
- }
- //初始化depMap
- List<Department> deps = depService.getAllDeps();
- for(int i = 0; i < deps.size(); i++) {
- Department dep = deps.get(i);
- Integer depId = dep.getDepId();
- String depName = dep.getDepName();
- SysCode.depMap.put(depId, depName);
- }
- //初始化groMap
- List<Group> gros = groService.getAllGroups();
- for(int i = 0; i < gros.size(); i++) {
- Group gro = gros.get(i);
- Integer groId = gro.getGroId();
- String groName = gro.getGroName();
- SysCode.groMap.put(groId, groName);
- }
- }
- }
3. 在web.xml文件中配置InitialServlet :
- <servlet>
- <description></description>
- <display-name>InitialServlet</display-name>
- <servlet-name>initialServlet</servlet-name>
- <servlet-class>
- com.test.common.util.DelegatingServletProxy
- </servlet-class>
- <load-on-startup>2</load-on-startup>
- </servlet>
- <servlet-mapping>
- <servlet-name>initialServlet</servlet-name>
- <url-pattern>/InitialServlet</url-pattern>
- </servlet-mapping>
完成这些操作后,就可以在Spring容器启动后执行自定义的Servlet,并且在自定义Servlet中可以使用Spring Annotation的自动注入功能。 <script></script>
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