Spring_SSJ集成

文章目录

1 三大框架
- 1.1 ssh
- 1.2 ssm(最流行的框架)
- 1.3 ssj(Spring springMvc jpa)
2 Spring集成JPA
- 2.1 加载jdbc.properties
- 2.2 配置ApplicationContext.xml
- 2.3 spring事物传播机制
- - 2.3.1 事物配置
3 SpringMVC和spring集成或者整合
- 3.1 配置web.xml
- 3.2 配置ApplicationContext-mvc.xml
- 3.3 修改web.xml，解决延迟加载的异常

1 三大框架

1.1 ssh

struts
spring
hibernate
(struts2 Spring Hibernate)

1.2 ssm(最流行的框架)

SpringMVC
Spring
MyBatis

1.3 ssj(Spring springMvc jpa)

Struts2 Spring JPA
SpringMVC Spring JPA
SpringMVC Spring spring Data JPA（spring的全家桶）

2 Spring集成JPA

<dependencies>
<!-- spring和springmvc整合包-->
<dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>4.2.5.RELEASE</version>
</dependency>
<dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>4.2.5.RELEASE</version>
</dependency>
<!-- springjdbc的包-->
<dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>4.2.5.RELEASE</version>
</dependency>
<!-- Spring和ORM(JPA)整合的包-->
<dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>4.2.5.RELEASE</version>
</dependency>
<dependency><groupId>org.hibernate</groupId><artifactId>hibernate-core</artifactId><version>4.3.8.Final</version>
</dependency>
<dependency><groupId>org.hibernate</groupId><artifactId>hibernate-entitymanager</artifactId><version>4.3.8.Final</version>
</dependency>
<!-- mysql数据库-->
<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.6</version>
</dependency>
<!-- 连接池-->
<dependency><groupId>commons-dbcp</groupId><artifactId>commons-dbcp</artifactId><version>1.2.2</version>
</dependency>
<!-- Spring测试-->
<dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>4.2.5.RELEASE</version>
</dependency>
<!-- Springaop-->
<dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.8.9</version>
</dependency>
<!-- 处理json的包-->
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.6.5</version>
</dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope>
</dependency>
</dependencies>

2.1 加载jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///ssj
jdbc.username=root
jdbc.password=root

2.2 配置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:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx.xsd"><!--开启注解扫描--><context:component-scan base-package="cn.itsource" /><!-- 加载jdbc.properties --><context:property-placeholder location="classpath:jdbc.properties" /><!-- 配置连接池dataSource --><!-- destroy-method="close当前bean销毁的时候，会先调用close方法，关闭连接" --><bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"><!-- 依赖注入连接池需要的属性 --><!-- property name="是BasicDataSource的set方法，本质属性" --><!-- property value="是jdbc.properties配置文件的key" --><property name="driverClassName" value="${jdbc.driverClassName}" /><property name="url" value="${jdbc.url}" /><property name="username" value="${jdbc.username}" /><property name="password" value="${jdbc.password}" /></bean><!--得到EntityManagerFactory--><bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"><!--配置属性--><property name="dataSource" ref="dataSource" /><!--扫描实体类--><property name="packagesToScan" value="cn.itsource.domain" /><property name="jpaVendorAdapter"><bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"><!--是否显示sql--><property name="showSql" value="true" /><!--是否创建表--><property name="generateDdl" value="true" /><!--数据库方言--><property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" /></bean></property></bean><!--事物管理器--><bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"><property name="entityManagerFactory" ref="entityManagerFactory" /></bean><!--开启事物  扫描@Transaction这种注解--><tx:annotation-driven /></beans>

2.3 spring事物传播机制

事物的传播机制 Propagation
Propagation.REQUIRED
表示当前方法必须运行在事物中

Propagation.SUPPORTS
表示当前不需要事物，如果存在当前事物那么就在这个事物中运行

Propagation.MANDATORY
表示该方法必须在事务中运行，如果当前事务不存在，则会抛出一个异常

Propagation.REQUIRES_NEW
表示当前方法必须运行在它自己的事务中。一个新的事务将被启动。如果存在当前事务，在该方法执行期间，
当前事务会被挂起。如果使用JTATransactionManager的话，则需要访问TransactionManager

Propagation.NOT_SUPPORTED
表示该方法不应该运行在事务中。如果存在当前事务，在该方法运行期间，当前事务将被挂起。
如果使用JTATransactionManager的话，则需要访问TransactionManager

Propagation.NEVER
表示当前方法不应该运行在事务上下文中。如果当前正有一个事务在运行，则会抛出异常

Propagation.NESTED
表示如果当前已经存在一个事务，那么该方法将会在嵌套事务中运行。嵌套的事务可以独立于当前事务进行单独地提交或回滚。
如果当前事务不存在，那么其行为与PROPAGATION_REQUIRED一样。注意各厂商对这种传播行为的支持是有所差异的。

2.3.1 事物配置

readOnly = true
只读

@Transactional(propagation = Propagation.SUPPORTS,readOnly = true)
public class ProductServiceImpl implements IProductService

如果自身的方法配置传播机制方法上面就采用自己配置注解

@Transactional(propagation = Propagation.REQUIRED)
public void save(Product product) {productDao.save(product);
}

3 SpringMVC和spring集成或者整合

3.1 配置web.xml

导入jar --spring-web /spring-webmvc

配置springmvc配置文件
配置前缀后缀 (视图解析器)
静态资源放行
上传解析器
扫描@RequestMapping注解

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaeehttp://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"version="3.1"><!--处理懒加载关闭问题--><filter><filter-name>OpenEntityManagerInViewFilter</filter-name><filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class></filter><filter-mapping><filter-name>OpenEntityManagerInViewFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!--监听器读取配置--><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:ApplicationContext.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!--字符编码过滤器--><filter><filter-name>characterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param><init-param><param-name>forceEncoding</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>characterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!--核心控制器--><servlet><servlet-name>dispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:ApplicationContext-mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dispatcherServlet</servlet-name><url-pattern>/</url-pattern></servlet-mapping>
</web-app>

3.2 配置ApplicationContext-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsd"><context:component-scan base-package="cn.itsource.web.controller" /><!--静态资源放行--><mvc:default-servlet-handler /><!--扫描--><mvc:annotation-driven /><!--视图解析器--><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/views/" /><property name="suffix" value=".jsp" /></bean>
</beans>

3.3 修改web.xml，解决延迟加载的异常

<!-- 添加关闭entityManger过滤器，必须在struts2过滤器之前 -->
<filter><filter-name>OpenEntityManagerInViewFilter</filter-name><filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter><filter-mapping><filter-name>OpenEntityManagerInViewFilter</filter-name><url-pattern>/*</url-pattern>
</filter-mapping>

在Product类里面配置

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="dir_id")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
private ProductDir productDir;