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由“单独搭建Mybatis”到“Mybatis与Spring的整合/集成”
在J2EE领域,Hibernate与Mybatis是大家常用的持久层框架,它们各有特点,在持久层框架中处于领导地位。
本文主要介绍Mybatis(对于较小型的系统,特别是报表较多的系统,个人偏向Mybatis),对于它,个人比较喜欢的是:
- 使用简单、方便;
- 支持的XML动态SQL的编写,方便浏览、修改,同时降低SQL与应用程序之间的耦合。
不喜欢的是:
- 出现错误时,调试不太方便
本文主要介绍Mybatis的搭建,是学习Mybatis过程后整理的札记,其中包括“单独搭建Mybaits”和常用的“Mybatis与Spring的整合”。
一、数据库的准备
因为Mybatis是持久层框架,毫无疑问,是需要操作数据库的。所以,在搭建之前,我们需要先创建一个简单的表。
create table T_USER_TEST_1407( USERNAME VARCHAR2(255), PASSWORD VARCHAR2(255))
插入一些数据,以作查询的测试。
insert into T_USER_TEST_1407 (USERNAME, PASSWORD)values (‘nick‘, ‘Optimistic,Confident,Love - 1‘);
二、单独搭建Mybaits
1)环境准备、版本说明
此工程使用JDK1.6 + mybatis-3.2.4 + Oracle11g。
新建一个Web工程,由于只构建Mybatis,只引用Mybatis和Oracle JDBC驱动包
- mybatis-3.2.4.jar
- ojdbc6.jar
2)程序的搭建
首先,我们将数据源等配置信息放在一个xml,让Mybatis可以根据这个信息去连接数据库、管理事务。
目前我们可只关注environments节点,此节点是用于配置数据源、事务管理的 。
其他的节点,如typeAliases、mappers,是用于注册一些信息的,后面会陆续提到。
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE configuration 3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 4 "http://mybatis.org/dtd/mybatis-3-config.dtd"> 5 6 <configuration> 7 8 <!-- Register Alias --> 9 <typeAliases>10 <typeAlias alias="user" type="com.nicchagil.mybatisonly.bean.User" />11 </typeAliases>12 13 <!-- Data Source -->14 <environments default="development">15 <environment id="development">16 <transactionManager type="JDBC" />17 <dataSource type="POOLED">18 <property name="driver" value="oracle.jdbc.driver.OracleDriver" />19 <property name="url" value="jdbc:oracle:thin:@xxx.xxx.xxx.xxx:xxxx:xxxxxx" />20 <property name="username" value="xxxx" />21 <property name="password" value="xxxx" />22 </dataSource>23 </environment>24 </environments>25 26 <!-- Register Mapper -->27 <mappers>28 <!-- SQL Mapper -->29 <mapper resource="com/nicchagil/mybatisonly/mapper/sqlxml/UserMapper.xml" />30 </mappers>31 32 </configuration>
既然有了配置的xml,下一步就需要让Mybatis加载它了。
- 首先以输入流的形式加载xml
- 以“SqlSessionFactoryBuilder -> SqlSessionFactory -> SqlSession”的流程最后构建出SqlSession。
- SqlSession,顾名思义,是一次会话,是应用程序与数据库交互的会话,所以,其生命周期应在一次数据库连接之间,当然,此次数据库连接可以包含一次或多次数据库操作。
- SqlSessionFactory,顾名思义,是SqlSession的工厂类,用于产出SqlSession。我们知道,SqlSession主要用于数据库操作,而数据库操作又是贯穿于应用程序整个生命周期当中的,那么,"产出SqlSession"这个动作也应当贯穿于应用程序整个生命周期当中,所以,SqlSessionFactory的生命周期一般为应用程序的整个生命周期,一般为单例/static的形式存在。
- SqlSessionFactoryBuilder,由代码可见,其主要作用是从配置文件中获取配置信息,然后构建SqlSessionFactory,所以其生命周期可以是临时的,局部的。
- 通过SqlSession获取UserMapper接口,再调用该接口的数据操纵方法。
package com.nicchagil.mybatisonly;import java.io.IOException;import java.io.InputStream;import org.apache.ibatis.io.Resources;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;import com.nicchagil.mybatisonly.bean.User;import com.nicchagil.mybatisonly.mapper.UserMapper;public class Call { public static SqlSessionFactory sqlSessionFactory = null; public static void main(String[] args) throws IOException { // Query User /* kickStartMybatis(); queryUser("nick"); */ // Inser User kickStartMybatis(); insertUser("user004", "hello world."); } public static void kickStartMybatis() throws IOException { String resource = "com/nicchagil/mybatisonly/mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); } /** * Query User * @param username * @return */ public static User queryUser(String username) { User user = null; SqlSession session = sqlSessionFactory.openSession(); try { /* Un-recommended Method */ /* user = (User)session.selectOne("com.nicchagil.mybatisonly.mapper.UserMapper.queryUser", username); */ /* Recommended Method */ UserMapper userMapper = session.getMapper(UserMapper.class); user = userMapper.queryUser(username); System.out.println("username - " + user.getUsername() + " , password - " + user.getPassword()); } finally { session.close(); } return user; } /** * Insert User * @param username * @param password */ public static void insertUser(String username, String password) { SqlSession session = sqlSessionFactory.openSession(); try { UserMapper userMapper = session.getMapper(UserMapper.class); User user = new User(); user.setUsername(username); user.setPassword(password); userMapper.insertUser(user); // Flushes batch statements and commits database connection. // Note that database connection will not be committed if no updates/deletes/inserts were called. session.commit(); System.out.println("username - " + user.getUsername() + " , password - " + user.getPassword()); } catch (Exception e) { session.rollback(); e.printStackTrace(); //TODO Print the exception logs //TODO Prompts fail to execute for user } finally { session.close(); } } /** * Insert User * @param username * @param password */ public static void insertUserBySQL(String username, String password) { SqlSession session = sqlSessionFactory.openSession(); try { User user = new User(); user.setUsername(username); user.setPassword(password); session.insert("com.nicchagil.mybatisonly.mapper.UserMapper.insertUser", user); // Flushes batch statements and commits database connection. // Note that database connection will not be committed if no updates/deletes/inserts were called. session.commit(); } catch (Exception e) { session.rollback(); e.printStackTrace(); //TODO Print the exception logs //TODO Prompts fail to execute for user } finally { session.close(); } }}
UserMapper是一个DAO的接口,是定义作哪些数据库操作的。
1 package com.nicchagil.mybatisonly.mapper;2 3 import com.nicchagil.mybatisonly.bean.User;4 5 public interface UserMapper {6 7 public User queryUser(String username);8 9 }
UserMapper只是供调用的接口,那么具体的实现逻辑在哪里呢?
我们可见UserMaper.xml,它定义的SQL就是用于定义UserMapper接口的实现。我们需在mybatis-config.xml注册UserMaper.xml,可见mybatis-config.xml的mappers节点。
- 我们可以看到id为queryUser,与接口的方法名对应;
- SQL我们很熟悉了,就是一个简单的SQL,而#{username},就是接口方法的入参;
- resultType为"user",这个user是一个别名,具体对应com.nicchagil.mybatisonly.bean.User这个类,我们可以看到在mybatis-config.xml文件的typeAliases节点中已经注册它们的映射关系。
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.nicchagil.mybatisonly.mapper.UserMapper"> <select id="queryUser" resultType="user"> select * from t_user_test_1407 t where t.username = #{username} </select> <insert id="insertUser" parameterType="user"> INSERT INTO t_user_test_1407 T (T.USERNAME, T.PASSWORD) VALUES (#{username}, #{password}) </insert></mapper>
而com.nicchagil.mybatisonly.bean.User是实体类,用于装载数据。
1 package com.nicchagil.mybatisonly.bean; 2 3 public class User { 4 5 private String username; 6 private String password; 7 8 public String getUsername() { 9 return username;10 }11 12 public void setUsername(String username) {13 this.username = username;14 }15 16 public String getPassword() {17 return password;18 }19 20 public void setPassword(String password) {21 this.password = password;22 }23 24 @Override25 public int hashCode() {26 final int prime = 31;27 int result = 1;28 result = prime * result29 + ((password == null) ? 0 : password.hashCode());30 result = prime * result31 + ((username == null) ? 0 : username.hashCode());32 return result;33 }34 35 @Override36 public boolean equals(Object obj) {37 if (this == obj)38 return true;39 if (obj == null)40 return false;41 if (getClass() != obj.getClass())42 return false;43 User other = (User) obj;44 if (password == null) {45 if (other.password != null)46 return false;47 } else if (!password.equals(other.password))48 return false;49 if (username == null) {50 if (other.username != null)51 return false;52 } else if (!username.equals(other.username))53 return false;54 return true;55 }56 57 }
最后,我们运行Call.java,将能成功查询、插入数据库。我们可通过打印的信息和查询数据库,以查看是否成功查询、插入数据。
3)事务说明
对于数据库有写操作的应用程序,一般来说,事务是不可或缺的一部分。因为未使用其他框架,这里使用编程式事务,即使用SqlSession.commit()和SqlSession.rollback()方法,可见Call.java。
- 由于本程序对事务有异常回滚的要求,所以,需要获取非自动提交的SqlSession
- 如程序执行正常,则最后执行session.commit()以提交事务。
- session.commit()有个需注意的地方,参考其如下注释,即如果当前会话中不涉及updates/deletes/insert等写数动作则不提交事务。所以,如果要触发Mybatis提交事务,就需执行明确的触发动作,如“执行session.insert(...)方法”或“执行对应的SQL Mapper配置中的insert、update、delete等标签”等操作。(本人曾尝试在SQL Mapper配置中用select标签包含INSERT的SQL,使用SqlSession.commit()后,执行正常,但没有提交事务,可见并未触发,所以,需规范使用标签)。如需强制提交,可用SqlSession.commit(boolean)。
Flushes batch statements and commits database connection. Note that database connection will not be committed if no updates/deletes/inserts were called. To force the commit call SqlSession.commit(boolean)
- session.commit()有个需注意的地方,参考其如下注释,即如果当前会话中不涉及updates/deletes/insert等写数动作则不提交事务。所以,如果要触发Mybatis提交事务,就需执行明确的触发动作,如“执行session.insert(...)方法”或“执行对应的SQL Mapper配置中的insert、update、delete等标签”等操作。(本人曾尝试在SQL Mapper配置中用select标签包含INSERT的SQL,使用SqlSession.commit()后,执行正常,但没有提交事务,可见并未触发,所以,需规范使用标签)。如需强制提交,可用SqlSession.commit(boolean)。
- 如程序执行异常,则回滚事务,session.rollback()
单独搭建Mybaits完毕!
二、 Mybatis与Spring的整合
一个项目中,单独使用Mybatis的情况并不多;更多的情况下,我们需要将Mybatis与其他框架进行整合,以便更好地使用。比如Mybatis + Spring,就是一个流行的整合组合。
1)环境准备、版本说明
本次用Mybatis3 + Spring3进行整合。注意,并不包含MVC框架的配置,因为本文的目的是学习Mybatis,所以尽量不引用其他框架,以避免影响代码的理解。
需引入的类库详情如下:
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>3.2.10.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.webflow</groupId> <artifactId>spring-webflow</artifactId> <version>2.4.0.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-oracle</artifactId> <version>1.0.0.RELEASE</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.4</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> </dependencies>
2)程序的搭建
首先,我们在Spring中配置关于Mybatis数据源的信息。
这里以applicationContext-mybatis.xml来体现,配置了如下信息:
- 注册数据源,常见的有JDBC或JNDI,根据具体情况择一。
- 注册sqlSessionFactory
- sqlSessionFactory是用来生产sqlSession以操作数据库的,所以,需指定sqlSessionFactory所引用的数据源
- 指定相应的SQL Mapper文件在哪里。我们自命名“_mapper后缀的xml文件”,主要用来定义SQL;“_resultmap后缀的xml文件”,则主要用来定义DB字段与应用程序实体属性的映射。
- 指定相应的应用程序实体在哪里,并自动注册不包含package名的别名
- 在哪些package下扫描Mapper接口,即DAO接口
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <!-- JDBC Data Source --> <!-- <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" > <property name="driverClassName" value="http://www.mamicode.com/oracle.jdbc.driver.OracleDriver" /> <property name="url" value="http://www.mamicode.com/jdbc:oracle:thin:@hostname:port:sid" /> <property name="username" value="http://www.mamicode.com/username" /> <property name="password" value="http://www.mamicode.com/password" /> </bean> --> <!-- JNDI Data Source --> <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName"> <value>JNDI_TEST_DB</value> </property> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="mapperLocations"> <list> <value>classpath:com/nicchagil/mybatis3spring3intg/mapper/sqlxml/*_mapper.xml</value> <value>classpath:com/nicchagil/mybatis3spring3intg/bean/resultmapxml/*_resultmap.xml</value> </list> </property> <property name="typeAliasesPackage" value="com.nicchagil.mybatis3spring3intg.bean" /> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.nicchagil.mybatis3spring3intg.mapper" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> </bean></beans>
除了Mybatis的信息,还有一些Spring的信息需要配置:
- 根据注解自动扫描并注册bean
- Spring的声明式事务管理(用以替代上一章节的“编程式事务”)
- 由于本程序没有集成MVC框架,在Servlet是通过Spring编程式地获得Spring管理的bean,所以这里注册一个Spring的工具类。(使用了MVC框架并将框架交由Spring IOC容器管理的,可忽视此点配置)
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> <context:component-scan base-package="com.nicchagil.mybatis3spring3intg" /> <!-- Transaction Support --> <tx:annotation-driven transaction-manager="transactionManager" /> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <bean id="SpringContextUtil" class="com.nicchagil.util.SpringContextUtil"/></beans>
众所周知,以上是Spring的配置文件,那么我们需要告诉应用程序“这些配置文件在哪里”,所以我们需要在web.xml中告诉应用程序。另外,此web.xml注册了一个Servlet,用于接收页面的请求。
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>mybatis3spring3Intg</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:config/applicationContext*.xml</param-value> </context-param> <servlet> <description></description> <display-name>UserServlet</display-name> <servlet-name>UserServlet</servlet-name> <servlet-class>com.nicchagil.mybatis3spring3intg.servlet.UserServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>UserServlet</servlet-name> <url-pattern>/UserServlet</url-pattern> </servlet-mapping></web-app>
我们还需要定义Mapper的接口,即DAO接口。此处的Mapper的接口,我们已经在applicationContext-mybatis.xml中注册为指定路径下自动扫描。
package com.nicchagil.mybatis3spring3intg.mapper;import com.nicchagil.mybatis3spring3intg.bean.User;public interface UserMapper { public User find(String username); public void save(User user);}
而Mapper的实现是如何的呢?
Mybatis会帮我们实现,我们只需要通过user_mapper.xml文件告诉Mybatis对应的SQL,此处的mapper文件,已经在applicationContext-mybatis.xml中注册为指定路径下自动扫描。
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.nicchagil.mybatis3spring3intg.mapper.UserMapper"> <select id="find" resultType="user" resultMap="userResultMap"> select * from t_user_test_1407 t where t.username = #{username} </select> <insert id="save" parameterType="user"> INSERT INTO t_user_test_1407 T (T.USERNAME, T.PASSWORD) VALUES (#{username}, #{password}) </insert></mapper>
可以看到,Mapper和SQL配置文件中都引用到了实体类,我们也需要定义。此处的实体类,已经在applicationContext-mybatis.xml中注册为指定路径下自动扫描。
package com.nicchagil.mybatis3spring3intg.bean;public class User { private String username; private String password; private String childhoodName; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getChildhoodName() { return childhoodName; } public void setChildhoodName(String childhoodName) { this.childhoodName = childhoodName; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((childhoodName == null) ? 0 : childhoodName.hashCode()); result = prime * result + ((password == null) ? 0 : password.hashCode()); result = prime * result + ((username == null) ? 0 : username.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; User other = (User) obj; if (childhoodName == null) { if (other.childhoodName != null) return false; } else if (!childhoodName.equals(other.childhoodName)) return false; if (password == null) { if (other.password != null) return false; } else if (!password.equals(other.password)) return false; if (username == null) { if (other.username != null) return false; } else if (!username.equals(other.username)) return false; return true; }}
实体的属性与DB的字段之间的映射/匹配,我们需要定义一下。此处的resultmap.xml文件已经在applicationContext-mybatis.xml中注册为指定路径下自动扫描。
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.nicchagil.mybatis3spring3intg.mapper.UserMapper"> <resultMap type="user" id="userResultMap"> <result property="username" column="USERNAME" /> <result property="password" column="PASSWORD" /> <result property="childhoodName" column="USERNAME" /> </resultMap></mapper>
完成了DAO,那么接着写Service。
首先一个Service的接口。
package com.nicchagil.mybatis3spring3intg.service;import com.nicchagil.mybatis3spring3intg.bean.User;public interface UserService { public User query(String username); public void save(User user); public void testTransaction(User user1, User user2);}
Service的实现类如下,这里只简单地测试查询、保存、事务是否能正常处理。
package com.nicchagil.mybatis3spring3intg.service.impl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;import com.nicchagil.mybatis3spring3intg.bean.User;import com.nicchagil.mybatis3spring3intg.mapper.UserMapper;import com.nicchagil.mybatis3spring3intg.service.UserService;@Servicepublic class UserServiceImpl implements UserService { @Autowired private UserMapper mapper; @Override public User query(String username) { return mapper.find(username); } @Override public void save(User user) { mapper.save(user); } @Override @Transactional public void testTransaction(User user1, User user2) { mapper.save(user1); // Code a NullPointerException to test transaction setting String str = null; str.charAt(0); mapper.save(user2); } }
由于没有整合MVC框架,此处由一个Servlet(此Servlet已于web.xml中注册)获取页面请求并调用Service,
那么如何在Servlet中获得Spring IOC管理下Service的bean呢?这里借助SpringContextUtil(implements ApplicationContextAware),此SpringContextUtil于以上提及的applicationContext.xml中注册。
package com.nicchagil.mybatis3spring3intg.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.nicchagil.mybatis3spring3intg.bean.User;import com.nicchagil.mybatis3spring3intg.service.UserService;import com.nicchagil.util.SpringContextUtil;/** * Servlet implementation class UserServlet */public class UserServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public UserServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String action = request.getParameter("action"); UserService service = (UserService)SpringContextUtil.getBean("userServiceImpl"); if ("find".equals(action)) { User user = service.query(request.getParameter("username")); System.out.println(user.getUsername() + " - " + user.getPassword() + " - " + user.getChildhoodName()); } if ("save".equals(action)) { User user = new User(); user.setUsername(request.getParameter("username")); user.setPassword(request.getParameter("password")); service.save(user); System.out.println(user.getUsername() + " - " + user.getPassword()); } if ("testTransaction".equals(action)) { User user1 = new User(); user1.setUsername(request.getParameter("username")); user1.setPassword(request.getParameter("password")); User user2 = new User(); user2.setUsername(request.getParameter("username") + " - Double"); user2.setPassword(request.getParameter("password") + " - Double"); service.testTransaction(user1, user2); System.out.println(user1.getUsername() + " - " + user1.getPassword()); System.out.println(user2.getUsername() + " - " + user2.getPassword()); } }}
package com.nicchagil.util;import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;public class SpringContextUtil implements ApplicationContextAware { private static ApplicationContext applicationContext = null; @Override public void setApplicationContext(ApplicationContext ac) throws BeansException { applicationContext = ac; } public static ApplicationContext getApplicationContext() { return applicationContext; } public static Object getBean(String beanName) { return applicationContext.getBean(beanName); } public static boolean containsBean(String beanName) { return applicationContext.containsBean(beanName); }}
几乎大功告成。
这里写了些触发测试的页面,执行结果可通过“查看控制台”或“查询数据库”获得。哈哈!~~
导航页
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body><a href="find.html">find</a><br/><a href="save.html">save</a><br/><a href="testTransaction.html">testTransaction</a></body></html>
输入username查询记录的触发页面
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body> <form action="UserServlet"> <input type="hidden" name="action" value="find"> <input type="text" name="username"> <input type="submit"> </form></body></html>
保存页面
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body><body> <form action="UserServlet"> <input type="hidden" name="action" value="save"> <input type="text" name="username"> <input type="password" name="password"> <input type="submit"> </form></body></body></html>
测试事务的触发页面
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body><body> <form action="UserServlet"> <input type="hidden" name="action" value="testTransaction"> <input type="text" name="username"> <input type="password" name="password"> <input type="submit"> </form></body></body></html>
大功告成!!