学步园

这次纯用XML整合了一回SSH, hibernate不用annotation的以后 发现自己完全不熟悉spring注入的过程 会少些很多配置 , 费了好大劲才弄好.

一:struts标签给action传值时候NullPointer

public class TestAction extends ActionSupport {
	
	private TestTable test = null;

检查了半天 ,最后原因是没有getter&getter ,

查出来发现自己不确定spring是怎么注入进来的 , 

包括struts2标签的 "%{ instance.field }", 试了一下 这个表达式会调用getField()

二:struts配置文件写全class包名

		<action name="TestAction_*" class="com.rt.action.TestAction" method="{1}">
			<result name="success">..........

到这儿也是没有找到相应类和方法, 查了一下 要写全包名 也就是地址, 

之前还以为能自动找到的...

三:必须有Dao层和DaoImpl层

	<!-- 必须注入Dao层 -->
	<bean name="testDao" class="com.rt.dao.TestDaoImpl">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

本来就想做个实验, 就去掉了service层,  觉得直接在action中实现DaoImpl不就行了么 就有"化简"掉了IDao层

如果只有DaoImpl的话 get和load没有问题 ,但是如果想写入数据的话 就会出这个目前我见过最长的异常

Unable to instantiate Action, com.rt.action.TestAction, defined for 'TestAction_add' in namespace '/'Failed to convert property value of type '$Proxy4 implementing org.springframework.beans.factory.InitializingBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised'
to required type 'com.rt.dao.TestDaoImpl' for property 'testDaoImpl'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [$Proxy4 implementing org.springframework.beans.factory.InitializingBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised]
to required type [com.rt.dao.TestDaoImpl] for property 'testDaoImpl': no matching editors or conversion strategy found

错误类型是注入的类型不匹配, 

大体意思是我想给你注入到了Dao层, 但是现在配置是把DaoImpl注入进Dao层, 类型转换不过来

所以虽然Dao不用更换实现, 但还是老老实实写出该有的层次好了

四:LazyInitialization

21:03:50,512 ERROR LazyInitializationException:42 - could not initialize proxy - no Session
org.hibernate.LazyInitializationException: could not initialize proxy - no Session

五:saveOrUpdate

Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1

使用的是hibernate的saveOrUpdate方法保存实例。saveOrUpdate方法要求ID为null时才执行SAVE，在其它情况下执行UPDATE。在保存实例的时候是新增，但你的ID不为null，所以使用的是UPDATE，但是数据库里没有主键相关的值，所以出现异常。

原来光套用这个, 

	<context:annotation-config/>
	<context:component-scan base-package="com.rt"/>

 @Component、@Service和 @Controller

现在发现是手动配一下比较好

最后总结一下:

一:配置文件

<struts>
	<!-- 将Bean交给Spring管理 -->
	<constant name="struts.objectFactory" value="spring" />
	<package name="default" extends="struts-default" namespace="/">
	
		<action name="TestAction_*" class="com.rt.action.TestAction" method="{1}">
			<result name="success">success.jsp</result>
			<result name="input">fail.jsp</result>
		</action>

<?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/context http://www.springframework.org/schema/context/spring-context-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">



	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="configLocation"
			value="classpath:hibernate.cfg.xml">
		</property>
	</bean>
	
	<!-- 必须注入 -->
	<bean name="testDao" class="com.rt.dao.TestDaoImpl">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>
	
	
	<!-- 配置事务管理器 -->
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory">
			<ref bean="sessionFactory" />
		</property>
	</bean>
	<!-- 配置事务的传播特性 -->
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<tx:method name="add*" propagation="REQUIRED" />
			<tx:method name="save*" propagation="REQUIRED" />
			<tx:method name="del*" propagation="REQUIRED" />
			<tx:method name="update*" propagation="REQUIRED" />
			<tx:method name="modify*" propagation="REQUIRED" />
			<tx:method name="*" read-only="true" />
		</tx:attributes>
	</tx:advice>
	<!-- 那些类的哪些方法参与事务 -->
	<aop:config>
		<aop:pointcut id="allManagerMethod" expression="execution(* com.rt.dao.*.*(..))" />
		<aop:advisor pointcut-ref="allManagerMethod" advice-ref="txAdvice" />
	</aop:config>

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

    <session-factory>
		<!-- 数据库方言 -->
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
		<!-- 数据库驱动 -->
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<!-- 数据库连接信息 -->
		
	 <property name="connection.url">jdbc:mysql://localhost:3306/myoa_dec29?useUnicode=true&characterEncoding=UTF-8</property> 
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">890307</property>
		<!-- 打印SQL语句 -->
		<property name="hibernate.show_sql">true</property>
		<!-- 不格式化SQL语句 -->
		<property name="hibernate.format_sql">false</property>
		<!-- 为Session指定一个自定义策略 -->
		<property name="hibernate.current_session_context_class">thread</property>
		<!-- C3P0 JDBC连接池 -->
		<property name="hibernate.c3p0.max_size">20</property>
		<property name="hibernate.c3p0.min_size">5</property>
		<property name="hibernate.c3p0.timeout">120</property>
		<property name="hibernate.c3p0.max_statements">100</property>
		<property name="hibernate.c3p0.idle_test_period">120</property>
		<property name="hibernate.c3p0.acquire_increment">2</property>
		<property name="hibernate.c3p0.validate">true</property>		
		<!-- 映射文件 -->
		<mapping resource="com/rt/model/TestTable.hbm.xml"/>

 <display-name>MyOa_Dec29</display-name>
	<!-- 对Spring容器进行实例化 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationContext.xml</param-value><!-- applicationContext-*.xml -->
	</context-param>
	<!-- OpenSessionInViewFilter过滤器 -->
	<filter>
		<filter-name>openSessionInViewFilter</filter-name>
		<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>openSessionInViewFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<!-- Struts2配置 -->
	 <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
   </filter-mapping>
	<!-- 设置程序的默认欢迎页面-->
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>

二: Spring注入过程

public class TestAction extends ActionSupport {
	
	private TestTable test = null;
	
	private ITestDao testDao = null;

	public TestAction()
	{	
	}
	//必须有setter&getter

必须有Dao层和DaoImpl

public class TestDaoImpl extends HibernateDaoSupport implements ITestDao{

	public void addTestTable(TestTable tt)
	{	
		
		 getHibernateTemplate().saveOrUpdate(tt);
  
	}

<hibernate-mapping package="com.rt.model">
	<class name="TestTable" table="t_testtable">
		<id name="id">
			<generator class="native"/>
		</id>
		
		<property name="testname" not-null="true" length="45"/>
		
	</class>
</hibernate-mapping>