标签：return color images repo maven image uil pid cat
1：创建Maven项目
2：添加依赖（修改pom.xml为以下代码）
<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.gx</groupId> <artifactId>SpringData</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>SpringData 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> <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.0.1</version> <scope>provided</scope> </dependency> <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.38</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.3.5.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-jpa --> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-jpa</artifactId> <version>1.8.0.RELEASE</version> </dependency> <!-- hibernate-entity --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>4.3.6.Final</version> </dependency> </dependencies> <build> <finalName>SpringData</finalName> </build> </project>
3：创建配置文件spring-data-beans.xml（名字随便取）内容如下
<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:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <!-- 配置数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="username" value="root" /> <property name="password" value="root" /> <property name="url" value="jdbc:mysql://localhost:3307/test" /> </bean> <!-- 配置EntityManagerFactory --> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource"/> <!-- 设置jpa适配器 --> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/> </property> <!-- 采用注解的方式，扫描包下面的java类 --> <property name="packagesToScan" value="com.gx"/> <!-- jpa的相关配置 --> <property name="jpaProperties"> <props> <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop> <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop> <prop key="hibernate.show_sql">true</prop><!--执行的时候是否显示SQL--> <prop key="hibernate.format_sql">true</prop><!--执行的时候SQL是否格式化，如果不格式化的话得到的SQL语句就是一条，没有换行，不便阅读--> <prop key="hibernate.hbm2ddl.auto">update</prop><!--如果没有是否创建--> </props> </property> </bean> </beans>
4：创建测试类com.gx.SpringData测试配置文件spring-data-beans.xml里面配置的EntityManagerFactory是否成功
4.1：创建一个数据库里面没有的表的实体类（比如说User）内容如下
package com.gx.entity; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; /* * 这个Entity的注解会告诉配置文件这是一个实体类 * 配置文件会根据EntityManagerFactory来判断是否有这个表 * 如果没有回字段生成 */ @Entity public class User { /*最好使用封装之后的类型 * 因为在后面的类使用的时候需要用到泛型Repository<User, Integer>，这里的Integer就是主键Id */ private Integer id; private String name; private Integer age; @GeneratedValue//这个注解是告诉配置文件这个id是自增的 @Id//这个注解是告诉配置文件这是一个id public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } /*这个注解是设置表user里面的name字段的长度为20，默认不为空 * 如果不设置的话默认是255 */ @Column(length=20,nullable=false) public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "User [id=" + id + ", name=" + name + ", age=" + age + "]"; } }
4.2：创建测试类com.gx.SpringData内容如下
package com.gx; import org.junit.After; import org.junit.Before; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class SpringData { //获取上下文 private ApplicationContext ctx = null; @Before public void setup(){ System.out.println("setup is working......"); ctx = new ClassPathXmlApplicationContext("spring-data-beans.xml"); } @After public void destory(){ ctx = null; System.out.println("destory is working......"); } @Test public void testEntityManagerFctory(){ } }
4.3：测试结果
5：在配置文件里面添加配置
<!--配置事务管理器--> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory"/> </bean> <!--配置支持注解的事务--> <tx:annotation-driven transaction-manager="transactionManager"/> <!--配置spring data 需要扫描的包--> <jpa:repositories base-package="com.gx" entity-manager-factory-ref="entityManagerFactory"/> <!--在这个配置里面的内容spring都能够自动找到，更方便--> <context:component-scan base-package="com.gx"/>
6：创建接口com.gx.repository.UserRepository
package com.gx.repository; import org.springframework.data.repository.Repository; import com.gx.entity.User; public interface UserRepository extends Repository<User, Integer>{ public User findByName(String name); }
7：测试（在数据库中添加数据并在测试类里面查询）修改测试类com.gx.SpringData内容如下
package com.gx; import org.junit.After; import org.junit.Before; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.gx.entity.User; import com.gx.repository.UserRepository; public class SpringData { //获取上下文 private ApplicationContext ctx = null; private UserRepository userRepository = null; @Before public void setup(){ System.out.println("setup is working......"); ctx = new ClassPathXmlApplicationContext("spring-data-beans.xml"); userRepository = ctx.getBean(UserRepository.class); } @After public void destory(){ ctx = null; System.out.println("destory is working......"); } @Test public void testEntityManagerFctory(){ } @Test public void findByName(){ User user = userRepository.findByName("minuobaci"); System.out.println(user); } }
8：测试结果
标签：return color images repo maven image uil pid cat
原文地址：http://www.cnblogs.com/minuobaci/p/7524888.html
