Spring学习笔记（1）----将Spring与Servlet整合
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~