原則
1、使用Spring框架去整合另外兩個框架(SpringMVC、MyBatis);
2、使用配置文件+註解的方式進行整合(哪個方便使用哪個);
3、搭建框架的時候,我們必須保證Spring、SpringMVC、Mybatis3個框架能夠單獨正常使用。
準備工作
首先在maven中導入相關jar包的座標。
創建文件夾,文件節後如下:
Account類
public class Account implements Serializable {
private Integer id;
private String name;
private Double money;
//這裏getter和setter沒有粘貼
}
持久層接口IAccountDao
public interface IAccountDao {
//查詢所有賬戶
public List<Account> findAll();
//保存賬戶信息
public void saveAccount(Account account);
}
業務層接口:
public interface IAccountService {
//查詢所有賬戶
public List<Account> findAll();
//保存賬戶信息
public void saveAccount(Account account);
}
表現層
public class AccountController {
}
Spring框架的環境搭建
service層實現類:
public class AccountServiceImpl implements IAccountService {
@Override
public List<Account> findAll() {
System.out.println("業務層:查詢所有賬戶。。");
return null;
}
@Override
public void saveAccount(Account account) {
System.out.println("業務層:保存賬戶。。");
}
}
添加配置文件log4j,從而可以打印日誌信息。創建Spring配置文件:applicationContext.xml
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.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">
<!--開啓註解掃描,只希望處理service和dao,controller不需要spring去處理-->
<context:component-scan base-package="com.lwl">
<!--過濾,下面的這些註解除外,不掃描-->
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"></context:exclude-filter>
</context:component-scan>
</beans>
SpringMVC的環境搭建
編寫SpringMVC的配置文件:web.xml來配置前端控制器和創建springmvc.xml
web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<!--解決中文亂碼的過濾器-->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<!--設置編碼集-->
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<!--/*所有頁面都攔截-->
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--配置前端控制器-->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--加載SpringMVC.xml文件-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<!--啓動服務器時,創建該servlet-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--開啓註解掃描,只掃描controller註解-->
<context:component-scan base-package="com.lwl">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"></context:include-filter>
</context:component-scan>
<!--配置視圖解析器-->
<bean id="iternalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!--過濾靜態資源-->
<mvc:resources mapping="/js/" location="/js/**"></mvc:resources>
<mvc:resources mapping="/css/" location="/css/**"></mvc:resources>
<mvc:resources mapping="/images/" location="/images/**"></mvc:resources>
<!--開啓SpringMVC註解支持-->
<mvc:annotation-driven></mvc:annotation-driven>
</beans>
編寫簡單的jsp頁面:
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<a href="account/FindAll">測試FindAll</a>
</body>
</html>
Spring整合SpringMVC
啓動Tomcat服務器的時候,需要加載Spring的配置文件。
ServletContext是在服務器創建的時候創建,在服務關閉時銷燬,聲明週期和服務器的生命週期相同。
有一類監聽器可以監聽ServletContext的創建和銷燬,因此可以使用監聽器加載Spring配置文件。
在web.xml中添加:
<!--配置Spring監聽器,默認只加載WEB-INF目錄下的applicationContext.xml配置文件-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--Spring配置文件不在WEB-INF下,需要配置路徑-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
在Controller中添加業務層的內容:
@Controller
@RequestMapping("/account")
public class AccountController {
@Autowired
private AccountServiceImpl accountService;
@RequestMapping("/findAll")
public String findAll() {
System.out.println("表現層:查詢所有的賬戶信息");
accountService.findAll();
return "list";
}
}
MyBatis框架環境的搭建
爲IAccountDao添加註解:
public interface IAccountDao {
//查詢所有賬戶
@Select("select * from account")
public List<Account> findAll();
//保存賬戶信息
@Insert("insert into account(name,money) values (#{name},#{money})")
public void saveAccount(Account account);
}
編寫SqlMapConfig.xml核心配置文件:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--配置環境-->
<environments default="mysql">
<environment id="mysql">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost/test"></property>
<property name="username" value="root"></property>
<property name="password" value="1022"></property>
</dataSource>
</environment>
</environments>
<!--引入映射配置文件-->
<mappers>
<!--<mapper class="com.lwl.dao.IAccountDao"></mapper>-->
<package name="com.lwl.dao"></package>
</mappers>
</configuration>
測試MyBatis環境是否可以正常使用:
public class TestMybatis {
@Test
public void testfindAll() throws Exception {
//加載mybatis配置文件
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
//創建SqlSessionFactory對象
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
SqlSession sqlSession = factory.openSession();
//獲取代理對象
IAccountDao accountDao = sqlSession.getMapper(IAccountDao.class);
accountDao.findAll();
//關閉資源
sqlSession.close();
in.close();
}
@Test
public void testSaveAccount() throws Exception {
//加載mybatis配置文件
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
//創建SqlSessionFactory對象
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
SqlSession sqlSession = factory.openSession();
//獲取代理對象
IAccountDao accountDao = sqlSession.getMapper(IAccountDao.class);
Account account = new Account();
account.setName("ggg");
account.setMoney(600.0);
accountDao.saveAccount(account);
//和查詢不同,增刪改需要提交事務
sqlSession.commit();
//關閉資源
sqlSession.close();
in.close();
}
}
Spring整合MyBatis
將MyBatis產生的代理對象放入當Spring容器中,可以使在業務層中通過IOC創建持久層的對象。
在applicationContext.xml中整合MyBatis:
<!--Spring整合mybatis-->
<!--配置連接池-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost/test"></property>
<property name="user" value="root"></property>
<property name="password" value="1022"></property>
</bean>
<!--配置sqlSessionFactory工廠-->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!--配置AccountDao接口所在包-->
<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.lwl.dao"></property>
</bean>
此時已經將MyBatis要配置的內容放到了spring的配置文件中,SqlMapConfig就可以刪除了。
接下來就可以在Service層中注入dao的對象:
@Service("accountService")
public class AccountServiceImpl implements IAccountService {
@Autowired
private IAccountDao accountDao;
@Override
public List<Account> findAll() {
List<Account> list = accountDao.findAll();
return list;
}
@Override
public void saveAccount(Account account) {
accountDao.saveAccount(account);
System.out.println("業務層:保存賬戶");
}
}
將數據庫中的數據顯示到頁面
將表現層controller中將數據轉發到頁面:
@Controller
@RequestMapping("/account")
public class AccountController {
@Autowired
private AccountServiceImpl accountService;
@RequestMapping("/findAll")
public String findAll(Model model) {
System.out.println("表現層:查詢所有的賬戶信息");
List<Account> list = accountService.findAll();
for (Account account : list) {
System.out.println(account);
}
//爲了轉發到頁面,存到域對象
model.addAttribute("list",list);
return "list";
}
}
jsp頁面:
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%--引入jstl標籤庫--%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h3>查詢所有的賬戶</h3>
<c:forEach items="${list}" var="account">
${account.name}
${account.money}<br>
</c:forEach>
</body>
</html>