Hibernate Spring的整合求高手指导快要崩溃了

Question

public Book selectBook(String ISBN){
System.out.println(ISBN);
List list=this.getHibernateTemplate().find("from Book where ISBN=?",ISBN); //报错就是这一行
Book book=null;
if(list.size()>0)
{
book=(Book)list.get(0);
}
return book;
}
/////*******************////
public interface BookDao {

public void addBook(Book book);
public void deleteBook(String ISBN);
public void updateBook(Book book);
public Book selectBook(String ISBN);

}///////////////**************////////
public interface StudentService {
public Student selectStudent(String readerId);
}网页报错/////////////***///////
java.lang.NullPointerException
org.Dao.impl.BookDaoImpl.selectBook(BookDaoImpl.java:14)
org.action.BookAction.selectBook(BookAction.java:107)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)

Answer 1

跟踪一下看看你的this.getHibernateTemplate()是不是空的?

Answer 2

BookDaoImpl有木有继承HibernateDaoSupport？

Answer 3

你把SessionFactory的配置贴出来啊

Answer 4

<bean id="StudentDAO" class="org.Dao.impl.StudentDaoImpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="LendDAO" class="org.Dao.impl.LendDaoImpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="BookDAO" class="org.Dao.impl.BookDaoImpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="LoginDAO" class="org.Dao.impl.LoginDaoImpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>

Answer 5

那你怎么配置的sessionFactory贴出来

Answer 6

dubug跟踪一下,断点打在 List list=this.getHibernateTemplate().find("from Book where ISBN=?",ISBN);这一行,选中this.getHibernateTemplate() ctrl+shift+i看一下获得到的值是不是空的,要是空的可能就是你配置的问题了

Answer 7

把你的sessionFactory的配置和dataSource的配置贴出来，应该就是你配置的问题

Answer 8

<?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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
   <bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName"
value="com.microsoft.sqlserver.jdbc.SQLServerDriver">
</property>
<property name="url"
value="jdbc:sqlserver://localhost:1433;databaseName=CH12Data">
</property>
<property name="username" value="sa"></property>
<property name="password" value="1680012"></property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.SQLServerDialect
</prop>
<prop key="hibernate.show_sql">
true
</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>org/model/Login.hbm.xml</value>
<value>org/model/Book.hbm.xml</value>
<value>org/model/Student.hbm.xml</value>
<value>org/model/Lend.hbm.xml</value></list>
</property></bean>
<bean id="StudentDAO" class="org.Dao.impl.StudentDaoImpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="LendDAO" class="org.Dao.impl.LendDaoImpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="BookDAO" class="org.Dao.impl.BookDaoImpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="LoginDAO" class="org.Dao.impl.LoginDaoImpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>

<bean id="bookservice" class="org.service.Impl.BookServiceImpl">
<property name="bookDao" ref="BookDAO"></property>
</bean>
<bean id="loginservice" class="org.service.Impl.LoginServiceImpl">
<property name="loginDao" ref="LoginDAO"></property></bean>

<bean id="studentservice" class="org.service.Impl.StudentServiceImpl">
<property name="studentDao" ref="StudentDAO"></property></bean>

<bean id="lendservice" class="org.service.Impl.LendServiceImpl">
<property name="lendDao" ref="LendDAO"></property></bean>

<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref local="sessionFactory"></ref>
</property></bean>

<bean id="transactionInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor">
  <property name="transactionManager" ref="transactionManager"></property>
  <property name="transactionAttributes">
     <props>
       <prop key="delete*">PROPAGATION_REQUIRED</prop>
       <prop key="*">PROPAGATION_REQUIRED</prop>
     </props>
  </property>
</bean>
<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
<property name="beanNames">
<list>
<value>bookservice</value>
        <value>studentservice</value>
        <value>loginservice</value>
        <value>lendservice</value>
</list>
</property>
<property name="interceptorNames">
<list>
<value>transactionInterceptor</value>
</list>
</property>
</bean><bean id="LoginAction" class="org.action.LoginAction">
  <property name="loginservice" ref="loginservice"></property>
</bean><bean id="LendAction" class="org.action.LendAction">
<property name="lendservice" ref="lendservice"></property>
<property name="bookservice" ref="bookservice"></property>
<property name="studentservice" ref="studentservice"></property>
</bean><bean id="BookAction" class="org.action.BookAction">
<property name="bookservice" ref="bookservice"></property>
<property name="lendservice" ref="lendservice"></property>
</bean>
</beans>
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="org.model.Book" table="book" schema="dbo" catalog="CH12Data">
        <id name="isbn" type="java.lang.String">
            <column name="ISBN" length="20" />
            <generator class="assigned" />
        </id>
        <property name="bookName" type="java.lang.String">
            <column name="bookName" length="40" not-null="true" />
        </property>
        <property name="author" type="java.lang.String">
            <column name="author" length="20" not-null="true" />
        </property>
        <property name="publisher" type="java.lang.String">
            <column name="publisher" length="20" not-null="true" />
        </property>
        <property name="price" type="java.lang.Double">
            <column name="price" precision="53" scale="0" not-null="true" />
        </property>
        <property name="cnum" type="java.lang.Integer">
            <column name="cnum" not-null="true" />
        </property>
        <property name="snum" type="java.lang.Integer">
            <column name="snum" not-null="true" />
        </property>
        <property name="summary" type="java.lang.String">
            <column name="summary" length="200" />
        </property>
        <property name="photo" type="java.lang.String">
            <column name="photo" length="50" />
        </property>
    </class>
</hibernate-mapping>

Answer 9

你都没有在配置文件中配置hibernateTemplate,你怎么获得它呢

Answer 10

1.在配置文件中配置
<!-- hibernateTemplate设置 -->
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
2.让你的Dao extends HibernateDaoSupport

Answer 11

不行啊  我还有一个登陆功能的 那个没问题啊  能用那个hibernateTemplate

Answer 12

你把 BookDaoImpl 类贴出来

Answer 13

14楼这个要配的? 不要误导别人 你这个多此一举 只要注入属性sessionFactory就行了 楼主肯定其他应气得

Answer 14

感觉应该是不用再添加了，至少哟一个能已经可以用了 BookDaoImpl代码 
package org.dao.impl;import java.util.List;import org.dao.BookDAO.BookDao;
import org.model.Book;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;public class BookDaoImpl extends HibernateDaoSupport implements BookDao {
    //查询图书信息
public Book selectBook(String isbn) {
// TODO Auto-generated method stub
List list = this.getHibernateTemplate().find("from Book where isbn=?",isbn);
Book book = null;
if(list.size()>0){
book=(Book)list.get(0);
}
return book;
}

//添加图书信息
public void addBook(Book book) {
// TODO Auto-generated method stub
this.getHibernateTemplate().save(book);
}

    //删除图书信息
public void deleteBook(String isbn) {
// TODO Auto-generated method stub
this.getHibernateTemplate().delete(this.selectBook(isbn));

}    //修改图书信息
public void updateBook(Book book) {
// TODO Auto-generated method stub
this.getHibernateTemplate().update(book);

}}

Answer 15

1.在配置文件中配置
<!-- hibernateTemplate设置 -->
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
2.让你的Dao extends HibernateDaoSupport

Answer 16

我估计根本就不是这个问题 你的controller层是怎么 调用的

Answer 17

<bean id="LoginAction" class="org.action.LoginAction">
  <property name="loginservice" ref="loginservice"></property>
</bean><bean id="LendAction" class="org.action.LendAction">
<property name="lendservice" ref="lendservice"></property>
<property name="bookservice" ref="bookservice"></property>
<property name="studentservice" ref="studentservice"></property>
</bean><bean id="BookAction" class="org.action.BookAction">
<property name="bookservice" ref="bookservice"></property>
<property name="lendservice" ref="lendservice"></property>
</bean>
这是你的三个action 你真正调用入口 这几哥action怎么获取的 不要告诉我你是new出来的