使用Spring的@Autowired 实现DAO, Service, Controller三层的注入

简述：

结合Spring和Hibernate进行开发

使用@Autowired实现依赖注入， 实现一个学生注册的功能，做一个技术原型

从DAO(Repository) -> Service -> Controller

目录结构：

使用Maven做本地包管理，

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>WebProject</groupId>  <artifactId>StudentManagementWeb</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>war</packaging>     <name>StudentManagementWeb</name>  <url>http://maven.apache.org</url>  <properties>   <org.springframework.version>3.0.2.RELEASE</org.springframework.version>  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties>  <dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency>    <!-- Project Requirements --><dependency>    <groupId>javax.servlet</groupId>    <artifactId>servlet-api</artifactId>    <version>2.5</version></dependency><dependency>    <groupId>org.slf4j</groupId>    <artifactId>slf4j-log4j12</artifactId>    <version>1.4.2</version>    </dependency><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-beans</artifactId>    <version>${org.springframework.version}</version></dependency><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-jdbc</artifactId>    <version>${org.springframework.version}</version>    </dependency><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-web</artifactId>    <version>${org.springframework.version}</version></dependency><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-webmvc</artifactId>    <version>${org.springframework.version}</version>    </dependency><dependency>    <groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>${org.springframework.version}</version></dependency><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-entitymanager</artifactId><version>3.4.0.GA</version></dependency><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-envers</artifactId><version>3.5.6-Final</version></dependency><dependency><groupId>taglibs</groupId><artifactId>standard</artifactId><version>1.1.2</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.1.2</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.10</version></dependency><dependency><groupId>commons-dbcp</groupId><artifactId>commons-dbcp</artifactId><version>20030825.184428</version></dependency><dependency><groupId>commons-pool</groupId><artifactId>commons-pool</artifactId><version>20030825.183949</version></dependency><dependency><groupId>cglib</groupId><artifactId>cglib</artifactId><version>2.2.2</version></dependency><dependency>   <groupId>org.aspectj</groupId>        <artifactId>aspectjweaver</artifactId>        <version>1.6.12</version></dependency>  </dependencies>  </project>

各文件如下：

Web.xml

<?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>StudentManagementWeb</display-name>  <welcome-file-list>    <welcome-file>StudentRegistration.jsp</welcome-file>  </welcome-file-list>    <resource-ref><description>DB Connection</description><res-ref-name>jdbc/smw</res-ref-name><res-type>javax.sql.DataSource</res-type><res-auth>Container</res-auth>  </resource-ref>    <context-param>     <param-name>log4jConfigLocation</param-name>     <param-value>/WEB-INF/log4j.properties</param-value>   </context-param>     <!-- Define LOG4J Listener -->   <listener>    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>   </listener>     <servlet>  <!-- define the name of Servlet -->  <servlet-name>dispatcherServlet</servlet-name>  <!-- Servlet implementation class -->  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  <!-- initialize the context -->  <init-param>  <param-name>contextConfigLocation</param-name>  <!-- load configuration -->  <param-value>/WEB-INF/applicationContext.xml</param-value>  </init-param>  <!-- set loading priority -->  <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>  <servlet-name>dispatcherServlet</servlet-name>  <url-pattern>*.do</url-pattern>  </servlet-mapping>  </web-app>

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:context="http://www.springframework.org/schema/context"        xmlns:aop="http://www.springframework.org/schema/aop"        xmlns:tx="http://www.springframework.org/schema/tx"        xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd                http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd                http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="configLocation"><value>classpath:hibernate.cfg.xml</value></property></bean>  <!-- make spring look up annotation --> <context:annotation-config/> <context:component-scan base-package="smw.*"/>  <!-- configure the transaction management --> <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">          <property name="sessionFactory">              <ref bean="sessionFactory" />          </property>      </bean>  <tx:annotation-driven transaction-manager="txManager" /></beans>

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE hibernate-configuration PUBLIC          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration><session-factory><property name="connection.datasource">java:comp/env/jdbc/smw</property> <property name="dialect">org.hibernate.dialect.MySQLDialect</property><property name="show_sql">true</property><!-- show sql statement --><!-- mapping files --><mapping resource="smw/model/Student.hbm.xml"/></session-factory></hibernate-configuration>

由于使用了Tomcat的数据源，所以还需要在Tomcat的Context.xml中添加数据库连接配置

context.xml(Tomcat server中文件，eclispe中在workspace中的server project中）

context.xml

<?xml version="1.0" encoding="UTF-8"?><!--  Licensed to the Apache Software Foundation (ASF) under one or more  contributor license agreements.  See the NOTICE file distributed with  this work for additional information regarding copyright ownership.  The ASF licenses this file to You under the Apache License, Version 2.0  (the "License"); you may not use this file except in compliance with  the License.  You may obtain a copy of the License at      http://www.apache.org/licenses/LICENSE-2.0  Unless required by applicable law or agreed to in writing, software  distributed under the License is distributed on an "AS IS" BASIS,  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the specific language governing permissions and  limitations under the License.--><!-- The contents of this file will be loaded for each web application --><Context>    <!-- Default set of monitored resources -->    <WatchedResource>WEB-INF/web.xml</WatchedResource>    <!-- Uncomment this to disable session persistence across Tomcat restarts -->    <!--    <Manager pathname="" />    -->    <!-- Uncomment this to enable Comet connection tacking (provides events         on session expiration as well as webapp lifecycle) -->    <!--    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />    -->    <Resource name="jdbc/smw" auth="Container" type="javax.sql.DataSource"maxActive="100" maxIdle="30" maxWait="10000"username="root" password="sql" driverClassName="com.mysql.jdbc.Driver"url="jdbc:mysql://localhost:3306/smw"/></Context>

Student.java

package smw.model;public class Student {private int sid;private String name;private String password;private String college;public int getSid() {return sid;}public void setSid(int sid) {this.sid = sid;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getCollege() {return college;}public void setCollege(String college) {this.college = college;}}

Student.hbm.xml (学生表的映射）

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping><class name="smw.model.Student" table="tb_student" catalog="smw"><id name="sid" column="sid" type="int"><generator class="increment"/></id><property name="name" type="java.lang.String">    <column name="name"  not-null="true" length="20">        <comment>student's name</comment>    </column></property><property name="password" type="java.lang.String">    <column name="password"  not-null="false" length="10">        <comment>student's password</comment>    </column></property><property name="college" type="java.lang.String">    <column name="college"  not-null="false" length="20">        <comment>student's college</comment>    </column></property></class></hibernate-mapping>

IStudentDAO.java

package smw.dao;import smw.model.Student;public interface IStudentDAO {/** * Save Student into database * @param student */public void saveStudent(Student student);}

StudentDAOImpl.java

package smw.dao.impl;import javax.annotation.Resource;import org.hibernate.SessionFactory;import org.springframework.orm.hibernate3.support.HibernateDaoSupport;import org.springframework.stereotype.Repository;import org.springframework.transaction.annotation.Transactional;import smw.dao.IStudentDAO;import smw.model.Student;@SuppressWarnings("restriction")@Repository("studentDAO")@Transactionalpublic class StudentDAOImpl extends HibernateDaoSupport implements IStudentDAO{@Resource(name="sessionFactory") public void setSuperSessionFactory(SessionFactory sessionFactory){     super.setSessionFactory(sessionFactory);}public void saveStudent(Student student){getHibernateTemplate().save(student);}}

IStudentManagementService.java

package smw.service;import smw.model.Student;public interface IStudentManagementService {public void addStudent(Student student);}

StudentManagementServiceImpl.java

package smw.service.impl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Propagation;import org.springframework.transaction.annotation.Transactional;import smw.dao.IStudentDAO;import smw.model.Student;import smw.service.IStudentManagementService;@Servicepublic class StudentManagementServiceImpl implements IStudentManagementService {@Autowiredprivate IStudentDAO studentDAO;@Transactional(propagation=Propagation.REQUIRED)public void addStudent(Student student) {studentDAO.saveStudent(student);}}

StudentAction.java

package smw.action;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.multiaction.MultiActionController;import smw.model.Student;import smw.service.IStudentManagementService;@Controller@RequestMapping("StudentAction.do")public class StudentAction extends MultiActionController{@Autowiredprivate IStudentManagementService studentManagementService;@RequestMapping(params = "method=HandleStudentRegistrationFormSubmit")protected ModelAndView HandleStudentRegistrationFormSubmit(HttpServletRequest request, HttpServletResponse response) {Student student = new Student();String name = request.getParameter("name");String password = request.getParameter("password");String college = request.getParameter("college");student.setName(name);student.setPassword(password);student.setCollege(college);studentManagementService.addStudent(student);return new ModelAndView("StudentRegistered.jsp");}}

StudentRegistration.jsp

<%@ page language="java" contentType="text/html; charset=GBK"    pageEncoding="ISO-8859-1"%><!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>User Registration</title></head><body>    <h1 align="center">Student Registration Page</h1><form method="post" action="StudentAction.do?method=HandleStudentRegistrationFormSubmit" class="form"><table width="280" border="0" align="center"><tr><td width="87" align="center" valign="middle" ><div align="right">name:</div></td><td width="183">  <label><input name="name" type="text" id="name" maxlength="10" />  </label><td></tr><tr><td height="37" align="center" valign="middle">  <div align="right">password: </div></td><td><label> <input name="password" type="password" id="password" maxlength="20" /> </label></td></tr><tr><td height="37" align="center" valign="middle">  <div align="right">college: </div></td><td><label> <input name="college" type="text" id="college" maxlength="20" /> </label></td></tr><tr><td align="center" valign="middle">    <input type="submit" name="Submit" value="submit" /></td><td>     <input name="reset" type="reset" id="reset" value="reset" /></td></tr></table></form></body></html>

StudentRegistered.jsp

<%@ page language="java" contentType="text/html; charset=GBK"    pageEncoding="ISO-8859-1"%><!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=GBK"><title>User Registered</title></head>  <body>  <center>    <span class="STYLE2">Student Registered</span>  </center>  <br>  <table align="center" border="1">  <tr>  <td height="100"><span class="STYLE2">user name:</span></td>  <td height="100"><span class="STYLE2">${param.name }</span></td>  </tr>  <tr>  <td height="100"><span class="STYLE2">password:</span></td>  <td height="100"><span class="STYLE2">${param.password }</span></td>  </tr>    <tr>  <td height="100"><span class="STYLE2">college:</span></td>  <td height="100"><span class="STYLE2">${param.college }</span></td>  </tr>  <tr>  <td height="100" colspan="2" align="center"><a href="StudentRegistration.jsp" class="STYLE2">return to registration</a></td>  </tr>  </table>  </body></html>

结果：

跳转后，

数据库中新增记录，