Spring学习笔记(1)----将Spring与Servlet整合

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        之前一直都是将Spring与Struts2整合在一起,近日需要将Spring与Servlet整合在一起。如果把Spring与Struts2整合在一起的方法用到Servlet显然是不行的。因为Struts2已经与Servlet分离了,可以把Struts2的action类看成是一个普通类,可以用IOC的方式注入。但是Servlet是一个服务器类,servlet容器实例化一个对象是需要经过init()->Service()->doPost()||doGet()->destroy()的过程,所以我们需要在init()时期就创建一个ApplicationContext对象并且得到注册在Spring配置文件中的bean对象。


     做了个登录小例子,贴出完整的代码。


     新建一个web工程,在web.xml添加如下所示配置:


<context-param>    <param-name>contextConfigLocation</param-name>    <param-value>           classpath*:applicationContext.xml       </param-value>  </context-param>  <listener>    <description>启动spring上下工厂的监听器</description>    <listener-class>          org.springframework.web.context.ContextLoaderListener       </listener-class>  </listener>


      新建一个接口UserAccount.java,代码如下所示:


package com.ldfsoft.service; public interface UserAccount {    public boolean checkAccount(String account, String password);}


 

      接着新建一个该接口的实现类checkAccount.java  ,代码如下所示:

 

package com.ldfsoft.serviceimp; import com.ldfsoft.service.UserAccount; public class UserAccountImp implements UserAccount {     @Override    public boolean checkAccount(Stringaccount, String password) {       // TODO Auto-generatedmethod stub       if("admin".equals(account)&&"123".equals(password)){           return true;       }       return false;    } }


        将此类在Spring的配置文件applicationContext.xml配置一下,如下所示:


<?xml version="1.0"encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://www.springframework.org/schema/beans       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">             <bean id="userAccount"class="com.ldfsoft.serviceimp.UserAccountImp"></bean>               </beans>


 

       接着新建一个登陆页面login.jsp,代码如下所示:

 

<%@ page language="java"contentType="text/html; charset=utf-8"    pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTDHTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><script type="text/javascript">    function check(){       var account=document.getElementById("account").value;       var password=document.getElementById("password").value;       if(account=="" || password==""){           alert("用户名或者密码不能为空!");           return false;       }       return true;    }</script><meta http-equiv="Content-Type"content="text/html; charset=utf-8"><title>登录</title></head><body>    <form action="LoginServlet" method="post">       账户:<input type="text"id="account" name="account"><br>       密码:<input type="password"id="password" name="password"><br>       <input type="submit"value="登录" onclick="returncheck()">    </form></body></html>


         新建一个登陆成功的页面success.jsp,代码如下所示:


<%@ page language="java"contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTDHTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type"content="text/html; charset=UTF-8"><title>登陆成功</title></head><body>    <%=request.getParameter("account") %>,欢迎您回来...</body></html>


      登陆失败的页面fail.jsp,代码如下所示:


<%@ page language="java"contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTDHTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type"content="text/html; charset=UTF-8"><meta http-equiv="refresh"content="3;url=login.jsp"><title>登录失败</title></head><body>    用户名或密码错误,3秒后自动返回登陆页面...</body></html>


 

        接着新建一个servlet文件LoginServlet.Java,注意此init()方法中强制获取bean的方法


package com.ldfsoft.servlet; import java.io.IOException;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.context.ApplicationContext;importorg.springframework.web.context.support.WebApplicationContextUtils; import com.ldfsoft.service.UserAccount; /** * Servlet implementation class LoginServlet */public class LoginServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    private ApplicationContext applicationContext;    private UserAccount userAccount;    /**     * @see HttpServlet#HttpServlet()     */    public LoginServlet() {        super();        // TODO Auto-generated constructor stub    }     /**     * @seeServlet#init(ServletConfig)     */    public void init(ServletConfig config) throws ServletException {       // TODO Auto-generatedmethod stub       super.init(config);    applicationContext=WebApplicationContextUtils.getRequiredWebApplicationContext(this.getServletContext());       userAccount=(UserAccount) applicationContext.getBean("userAccount");    }     /**     * @seeHttpServlet#service(HttpServletRequest request, HttpServletResponse response)     */    protected void service(HttpServletRequest request, HttpServletResponseresponse) throws ServletException, IOException {       // TODO Auto-generatedmethod stub       String account=request.getParameter("account");       String password=request.getParameter("password");       System.out.println(account+":"+password);       if(userAccount.checkAccount(account, password)){           response.sendRedirect("success.jsp?account="+account);        }else{           response.sendRedirect("fail.jsp");       }    } }


 

      效果如下图所示:

 


 

          声明:这是本人学习的成果,允许转载,欢迎交流,但转载务必给出本文章的链接地址:http://blog.csdn.net/youqishini/article/details/8189141,谢谢~


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