在这篇文章中,我们将看到 Spring MVC、hibernate 和 mysql CRUD 示例的集成。
以下是使用 Spring MVC、hibernate 和 mySQL crud 示例创建项目的步骤。
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1) 在 Eclipse 中使用 maven创建一个 名为“SpringMVCHibernateCRUDExample”的动态 Web 项目
2)我们为此应用程序使用 Spring 4 和 Hibernate 4。它也应该与 hibernate 3 一起工作,但我们需要对 hibernate 配置做一些小的改动。
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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.arpit.java2blog</groupId> <artifactId>SpringMVCHibernateCRUDExample</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>SpringMVCHibernateCRUDExample Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.4.1</version> </dependency> <!-- Hibernate --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>${hibernate.version}</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>${hibernate.version}</version> </dependency> <!-- Apache Commons DBCP --> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <!-- Spring ORM --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${spring.version}</version> </dependency> <!-- AspectJ --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>${org.aspectj-version}</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.6</version> </dependency> <!-- https://mvnrepository.com/artifact/jstl/jstl --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> </dependencies> <build> <finalName>SpringMVCHibernateCRUDExample</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>${jdk.version}</source> <target>${jdk.version}</target> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <configuration> <failOnMissingWebXml>false</failOnMissingWebXml> </configuration> </plugin> </plugins> </build> <properties> <spring.version>4.2.1.RELEASE</spring.version> <security.version>4.0.3.RELEASE</security.version> <jdk.version>1.7</jdk.version> <hibernate.version>4.3.5.Final</hibernate.version> <org.aspectj-version>1.7.4</org.aspectj-version> </properties> </project>
3) 改变web.xml如下:
<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>Archetype Created Web Application</display-name> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationcontext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>spring</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
4) 在 /WEB-INF/ 文件夹中创建一个名为 spring-servlet.xml 的 xml 文件。 如果您想使用不同的 spring 包来搜索控制器,请更改 context:component-scan。
<?xml version="1.0" encoding="UTF-8"?> <beans:beans xmlns="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"> <annotation-driven /> <resources mapping="/resources/**" location="/resources/" /> <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <beans:property name="prefix" value="/WEB-INF/views/" /> <beans:property name="suffix" value=".jsp" /> </beans:bean> <beans:bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <beans:property name="driverClassName" value="com.mysql.jdbc.Driver" /> <beans:property name="url" value="jdbc:mysql://localhost:3306/CountryData" /> <beans:property name="username" value="root" /> <beans:property name="password" value="" /> </beans:bean> <!-- Hibernate 4 SessionFactory Bean definition --> <beans:bean id="hibernate4AnnotatedSessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <beans:property name="dataSource" ref="dataSource" /> <beans:property name="annotatedClasses"> <beans:list> <beans:value>org.arpit.java2blog.model.Country</beans:value> </beans:list> </beans:property> <beans:property name="hibernateProperties"> <beans:props> <beans:prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect </beans:prop> <beans:prop key="hibernate.show_sql">true</beans:prop> </beans:props> </beans:property> </beans:bean> <context:component-scan base-package="org.arpit.java2blog" /> <tx:annotation-driven transaction-manager="transactionManager" /> <beans:bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> <beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory" /> </beans:bean> </beans:beans>
在 Spring-servlet.xml 中,我们已经完成了休眠配置。 dataSource bean 用于指定java 数据源。我们需要提供驱动程序、URL、用户名和密码。 transactionManager bean 用于配置休眠事务管理器。 hibernate4AnnotatedSessionFactory bean 用于配置创建 Hibernate SessionFactory 的 FactoryBean。这是在 Spring 应用程序上下文中设置共享 Hibernate SessionFactory 的常用方法,因此您可以使用此 SessionFactory 来注入 Hibernate 数据访问对象。 在 WEB-INF 文件夹中创建一个 applicationcontext.xml,该文件用于 bean 配置,因为我们使用 spring-servlet.xml 进行 bean 配置,我们将保持该文件为空。
<!--?xml version="1.0" encoding="UTF-8"?-->
4) 在 org.arpit.java2blog.bean 中创建一个名为“Country.java”的 bean。
package org.arpit.java2blog.model; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Table; /* * This is our model class and it corresponds to Country table in database */ @Entity @Table(name="COUNTRY") public class Country{ @Id @Column(name="id") @GeneratedValue(strategy=GenerationType.IDENTITY) int id; @Column(name="countryName") String countryName; @Column(name="population") long population; public Country() { super(); } public Country(int i, String countryName,long population) { super(); this.id = i; this.countryName = countryName; this.population=population; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getCountryName() { return countryName; } public void setCountryName(String countryName) { this.countryName = countryName; } public long getPopulation() { return population; } public void setPopulation(long population) { this.population = population; } }
@Entity 用于制作持久化 pojo 类。对于这个 java 类,您将在数据库中拥有相应的表。@Column 用于将带注释的属性映射到表中的相应列。因此,使用以下代码在 mysql 数据库中创建 Country 表:
CREATE TABLE COUNTRY ( id int PRIMARY KEY NOT NULL AUTO_INCREMENT, countryName varchar(100) NOT NULL, population int NOT NULL ) ;
5)在包**org.arpit.java2blog.controller** 中创建一个名为“CountryController.java”的控制器
package org.arpit.java2blog.controller; import java.util.List; import org.arpit.java2blog.model.Country; import org.arpit.java2blog.service.CountryService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; @Controller public class CountryController { @Autowired CountryService countryService; @RequestMapping(value = "/getAllCountries", method = RequestMethod.GET, headers = "Accept=application/json") public String getCountries(Model model) { List listOfCountries = countryService.getAllCountries(); model.addAttribute("country", new Country()); model.addAttribute("listOfCountries", listOfCountries); return "countryDetails"; } @RequestMapping(value = "/getCountry/{id}", method = RequestMethod.GET, headers = "Accept=application/json") public Country getCountryById(@PathVariable int id) { return countryService.getCountry(id); } @RequestMapping(value = "/addCountry", method = RequestMethod.POST, headers = "Accept=application/json") public String addCountry(@ModelAttribute("country") Country country) { if(country.getId()==0) { countryService.addCountry(country); } else { countryService.updateCountry(country); } return "redirect:/getAllCountries"; } @RequestMapping(value = "/updateCountry/{id}", method = RequestMethod.GET, headers = "Accept=application/json") public String updateCountry(@PathVariable("id") int id,Model model) { model.addAttribute("country", this.countryService.getCountry(id)); model.addAttribute("listOfCountries", this.countryService.getAllCountries()); return "countryDetails"; } @RequestMapping(value = "/deleteCountry/{id}", method = RequestMethod.GET, headers = "Accept=application/json") public String deleteCountry(@PathVariable("id") int id) { countryService.deleteCountry(id); return "redirect:/getAllCountries"; } }
在包 org.arpit.java2blog.dao 中创建一个 CountryDAO.java类。此类将在与数据库交互时执行休眠语句。
package org.arpit.java2blog.dao; import java.util.List; import org.arpit.java2blog.model.Country; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; @Repository public class CountryDAO { @Autowired private SessionFactory sessionFactory; public void setSessionFactory(SessionFactory sf) { this.sessionFactory = sf; } public List getAllCountries() { Session session = this.sessionFactory.getCurrentSession(); List countryList = session.createQuery("from Country").list(); return countryList; } public Country getCountry(int id) { Session session = this.sessionFactory.getCurrentSession(); Country country = (Country) session.load(Country.class, new Integer(id)); return country; } public Country addCountry(Country country) { Session session = this.sessionFactory.getCurrentSession(); session.persist(country); return country; } public void updateCountry(Country country) { Session session = this.sessionFactory.getCurrentSession(); session.update(country); } public void deleteCountry(int id) { Session session = this.sessionFactory.getCurrentSession(); Country p = (Country) session.load(Country.class, new Integer(id)); if (null != p) { session.delete(p); } } }
@Repository 是 专门的组件注解 ,用于在 DAO 层创建 bean。我们使用 Autowired 注解将休眠 SessionFactory 注入 CountryDAO 类。我们已经在 Spring-Servlet.xml 文件中配置了休眠 SessionFactory 对象。
6)在包**org.arpit.java2blog.service** 中创建一个类 CountryService.java ,它是服务级类。它将调用 DAO 层类。
package org.arpit.java2blog.service; import java.util.List; import org.arpit.java2blog.dao.CountryDAO; import org.arpit.java2blog.model.Country; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; @Service("countryService") public class CountryService { @Autowired CountryDAO countryDao; @Transactional public List getAllCountries() { return countryDao.getAllCountries(); } @Transactional public Country getCountry(int id) { return countryDao.getCountry(id); } @Transactional public void addCountry(Country country) { countryDao.addCountry(country); } @Transactional public void updateCountry(Country country) { countryDao.updateCountry(country); } @Transactional public void deleteCountry(int id) { countryDao.deleteCountry(id); } }
@Service 是 专门的组件注解,用于在 Service 层创建 bean。
在 WEB-INF/view/ 文件夹中创建名为countryDetails.jsp 的视图。
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %> <%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %> <html> <head> <style> .blue-button{ background: #25A6E1; filter: progid: DXImageTransform.Microsoft.gradient( startColorstr='#25A6E1',endColorstr='#188BC0',GradientType=0); padding:3px 5px; color:#fff; font-family:'Helvetica Neue',sans-serif; font-size:12px; border-radius:2px; -moz-border-radius:2px; -webkit-border-radius:4px; border:1px solid #1A87B9 } table { font-family: "Helvetica Neue", Helvetica, sans-serif; width: 50%; } th { background: SteelBlue; color: white; } td,th{ border: 1px solid gray; width: 25%; text-align: left; padding: 5px 10px; } </style> </head> <body> <form:form method="post" modelAttribute="country" action="/SpringMVCHibernateCRUDExample/addCountry"> <table> <tr> <th colspan="2">Add Country</th> </tr> <tr> <form:hidden path="id" /> <td><form:label path="countryName">Country Name:</form:label></td> <td><form:input path="countryName" size="30" maxlength="30"></form:input></td> </tr> <tr> <td><form:label path="population">Population:</form:label></td> <td><form:input path="population" size="30" maxlength="30"></form:input></td> </tr> <tr> <td colspan="2"><input type="submit" class="blue-button" /></td> </tr> </table> </form:form> </br> <h3>Country List</h3> <c:if test="${!empty listOfCountries}"> <table class="tg"> <tr> <th width="80">Id</th> <th width="120">Country Name</th> <th width="120">Population</th> <th width="60">Edit</th> <th width="60">Delete</th> </tr> <c:forEach items="${listOfCountries}" var="country"> <tr> <td>{country.id}</td> <td>${country.countryName}</td> <td>${country.population}</td> <td><a href="<c:url value='/updateCountry/${country.id}' />" >Edit</a></td> <td><a href="<c:url value='/deleteCountry/${country.id}' />" >Delete</a></td> </tr> </c:forEach> </table> </c:if> </body> </html>
8) 是时候做 Maven 构建了。
右键单击项目-> 运行方式-> Maven 构建
9) 提供干净安装的目标(如下所示)并单击运行
10) 右键单击项目->运行为->在服务器上运行
选择apache tomcat并点击finish
11) 现在让我们点击下面的 URL 来获取所有国家/地区。 http://localhost:8080/SpringMVCHibernateCRUDExample/getAllCountries 你会得到下面的屏幕:
如您所见,我们没有将任何国家添加到列表中,因此它是空的。 让我们将名为 India 的国家添加到国家列表中,然后单击提交。 同样,我们将分别添加中国、不丹和尼泊尔,您将看到下面的屏幕。
让我们将不丹的人口编辑为 15000。单击编辑按钮对应于不丹。
当您单击提交时,您将进入以下屏幕。
让我们从上面的列表中删除国家中国,点击删除按钮对应于第二行。 您将看到下面的屏幕。
如您所见,china 已从上述列表中删除。
我们完成了 Spring MVC hibernate MySQL CRUD 示例。
原文链接:https://codingdict.com/