Spring整合web

Spring整合Web

       Spring整合web的原理是让Spring容器随着tomcat容器ServletContext的启动而启动。并且在初始化完成后放到整个应用都可以访问的范围。

        具体而言，tomcat启动加载配置文件，首先要init servlet，然后 init filter，web.xml注册过滤器自动调用初始化。Spring提供监听器ContextLoaderListener，确定配置文件的位置，通过系统初始化参数，完成启动。

 

步骤：

1、导入Jar包

spring-web-3.2.0.RELEASE.jar

2、编写DAO接口

public interface AccountDAO {//汇款是pay,收款是Receiptpublic void pay(String outer,Integer money);public void receipt(String inner,Integer money);}

3、编写DAO实现类

public class AccountDAOImpl extends JdbcDaoSupport implements AccountDAO {/* (non-Javadoc) * @see com.Lily.SpringLearning.J_tx_xml.AccountDAO#pay(java.lang.String, java.lang.Integer) */@Overridepublic void pay(String outer, Integer money) {// TODO Auto-generated method stubthis.getJdbcTemplate().update("update account set money = money - ? where username = ?", money,outer);}/* (non-Javadoc) * @see com.Lily.SpringLearning.J_tx_xml.AccountDAO#receipt(java.lang.String, java.lang.Integer) */@Overridepublic void receipt(String inner, Integer money) {// TODO Auto-generated method stubthis.getJdbcTemplate().update("update account set money = money + ? where username = ?", money,inner);}}

4、编写service接口

public interface Ser {//转账服务public void transfer(String outer,String inner,Integer money);}

5、编写service实现类

public class AccountSerImpl implements Ser {/* (non-Javadoc) * @see com.Lily.SpringLearning.J_tx_xml.Ser#transfer(java.lang.String, java.lang.String, java.lang.Integer) */private AccountDAO accountDao;public AccountDAO getAccountDao() {return accountDao;}public void setAccountDao(AccountDAO accountDao) {this.accountDao = accountDao;}@Overridepublic void transfer(String outer, String inner, Integer money) {// TODO Auto-generated method stubaccountDao.pay(outer, money);//模拟故障//int i=1/0;accountDao.receipt(inner, money);}}

6、编写servlet实现类

这里有两种从application作用域获得Spring容器的方式

方式一：手动从作用域获得

      ApplicationContext applicationContext =ApplicationContext)this.getServletContext().getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);

方式二：通过工具获得

ApplicationContextapppApplicationContext = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());

 

public class LilyServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {ApplicationContext at=WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());Ser service=(Ser) at.getBean("accountService");service.transfer("Lily", "dianer", 5);}public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doGet(request, response);}}

7、编写xml配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns:context="http://www.springframework.org/schema/context"         xmlns:aop="http://www.springframework.org/schema/aop"            xsi:schemaLocation="http://www.springframework.org/schema/beans           http://www.springframework.org/schema/beans/spring-beans-4.3.xsd          http://www.springframework.org/schema/aop           http://www.springframework.org/schema/aop/spring-aop.xsd          http://www.springframework.org/schema/context           http://www.springframework.org/schema/context/spring-context.xsd         "><context:property-placeholder location="classpath:com/Lily/SpringLearning/I_c3p0/JdbcInfo.properties" /><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="${jdbc.driverClass}"></property><property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property><property name="user" value="${jdbc.user}"></property><property name="password"  value="${jdbc.password}"></property></bean><bean id="accountDao" class="com.Lily.SpringLearning.L_web.AccountDAOImpl"><property name="dataSource" ref="dataSource"></property></bean><bean id="accountService" class="com.Lily.SpringLearning.L_web.AccountSerImpl"><property name="accountDao" ref="accountDao"></property></bean></beans>

8、编写测试类

 

public class txTest {@Testpublic void test() {String xmlPath = "com/Lily/SpringLearning/L_web/applicationContext.xml";ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);Ser accountService =  (Ser) applicationContext.getBean("accountService");accountService.transfer("dianer", "Lily", 6);}}