Spring2.5+JPA+Struts1.3

 

这里JPA的实现采用hibernate，需要使用到下面的jar文件

Hiberante核心包(8个文件)

hibernate-distribution-3.3.1.GA

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hibernate3.jar

lib/bytecode/cglib/hibernate-cglib-repack-2.1_3.jar

lib/required/*.jar

Hiberante注解包(3个文件)：hibernate-annotations-3.4.0.GA

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hibernate-annotations.jar

lib/ejb3-persistence.jar、hibernate-commons-annotations.jar

Hibernate针对JPA的实现包(3个文件)：hibernate-entitymanager-3.4.0.GA

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hibernate-entitymanager.jar

lib/test/log4j.jar、slf4j-log4j12.jar

 

Spring安装包下的

dist/spring.jar

dist/modules/spring-webmvc-struts.jar

lib/jakarta-commons/commons-logging.jar、commons-dbcp.jar、commons-pool.jar

lib/aspectj/aspectjweaver.jar、aspectjrt.jar

lib/cglib/cglib-nodep-2.1_3.jar

lib/j2ee/common-annotations.jar

lib/log4j/log4j-1.2.15.jar

Struts

下载struts-1.3.8-lib.zip，需要使用到解压目录下的所有jar，建议把jstl-1.0.2.jar和standard-1.0.2.jar更换为1.1版本。Spring中已经存在一个antlr-2.7.6.jar，所以把struts中的antlr-2.7.2.jar删除，避免jar冲突。

 

JPA规范要求在类路径的META-INF目录下放置persistence.xml，文件的名称是固定的，配置模版如下：

<?xml version="1.0"?>

<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">

  <persistence-unit name="itcast" transaction-type="RESOURCE_LOCAL">

      <properties>

         <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>

         <property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/>

         <property name="hibernate.connection.username" value="root"/>

         <property name="hibernate.connection.password" value="123456"/>

         <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/itcast?useUnicode=true&amp;characterEncoding=UTF-8"/>

         <property name="hibernate.max_fetch_depth" value="3"/>

         <property name="hibernate.hbm2ddl.auto" value="update"/>

      </properties>

  </persistence-unit>

</persistence>

 

在spring中配置EntityManagerFactory

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">

      <property name="persistenceUnitName" value="itcast"/>

  </bean>

  <bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager">

  <property name="entityManagerFactory" ref="entityManagerFactory"/>

  </bean>

 <tx:annotation-driven transaction-manager="txManager"/>

 

使用spring解决JPA因EntityManager关闭导致的延迟加载例外问题。

 <filter>

        <filter-name>Spring OpenEntityManagerInViewFilter</filter-name>

        <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>

        <init-param>

   <!-- 指定org.springframework.orm.jpa.LocalEntityManagerFactoryBean在spring配置文件中的名称,默认值为entityManagerFactory.如果LocalEntityManagerFactoryBean在spring中的名称不是entityManagerFactory,该参数一定要指定,否则会出现找不到entityManagerFactory的例外 -->

            <param-name>entityManagerFactoryBeanName</param-name>

            <param-value>entityManagerFactory</param-value>

      </init-param>

</filter>