================================================web.xml==============================================
<?xml version="1.0" encoding="UTF-8"?>
<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/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0"> <context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:spring.xml</param-value>
</context-param>
<!--配置监听器-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener> <!--配置OpenSessionInView,需要配置在struts过滤器之前,否则会被过滤掉-->
<filter>
<filter-name>openSessionInView</filter-name>
<filter-class>org.springframework.orm.hibernate5.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>openSessionInView</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> <!-- Struts核心过滤器 -->
<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>
</web-app>
================================================spring.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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd"> <!--开启注解-->
<context:annotation-config/>
<!--告知spring要去哪个包找注解-->
<context:component-scan base-package="com.ibeifeng.ssh"/>
<aop:aspectj-autoproxy/> <bean name="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<!--配置数据库信息-->
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/houserent"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</bean> <!--配置session信息-->
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="myDataSource"/>
<!--由于这里我们使用的是注解的方式得到属性,因此使用packagesToScan,
若在hibernate中使用hibernate.cfg.xml则在此处就使用mappingResources,
作用是指定从哪个包中查找注解的model-->
<property name="packagesToScan">
<value>com.ibeifeng.ssh.model</value>
</property>
<!--配置hibernate属性-->
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean> <bean id="txManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<!--注入sessionFactory-->
<!--<property name="dataSource" ref="myDataSource"/>-->
<property name="sessionFactory" ref="sessionFactory"/>
</bean> <!--配置事务增强,以及哪些方法使用什么样的规则-->
<tx:advice id="txAdvice" transaction-manager="txManager">
<tx:attributes>
<!--*号表示所有的方法都加入事务-->
<tx:method name="*" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice> <!--spring事务的实现是基于AOP方式-->
<aop:config>
<!--定义切入点-->
<aop:pointcut id="allMethod" expression="execution(* com.ibeifeng.ssh.dao.*.*(..))"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="allMethod"/>
</aop:config>
</beans>

================================================struts.xml==============================================

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.devMode" value="true"/>
<constant name="struts.enable.DynamicMethodInvocation" value="true"/>
<package name="default" extends="struts-default"> <!--使用通配符-->
<action name="*_*" class="{1}Controller" method="{2}">
<result name="success">{1}/{2}.jsp</result>
</action>
</package>
</struts>

================================================Employee.java==============================================

package com.ssh.model;

import org.hibernate.annotations.GenericGenerator;

import javax.persistence.*;

@Entity
@Table(name = "t_emp")
public class Employee {
private int id;
private String name;
private String salary; public Employee(){} public Employee(int id, String name, String salary) {
this.id = id;
this.name = name;
this.salary = salary;
} @Id
@GenericGenerator(name = "increment", strategy = "increment")
@GeneratedValue(generator = "increment")
public int getId() {
return id;
} public void setId(int id) {
this.id = id;
} @Column(name = "name")
public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} @Column(name = "salary")
public String getSalary() {
return salary;
} public void setSalary(String salary) {
this.salary = salary;
} @Override
public String toString() {
return "Employee{" +
"id=" + id +
", name='" + name + '\'' +
", salary='" + salary + '\'' +
'}';
}
}

================================================Group.java==============================================
package com.ssh.model;

import org.hibernate.annotations.GenericGenerator;
import javax.persistence.*; @Entity
@Table(name="t_group")
public class Group {
private int id;
private String name; public Group(){} public Group(int id, String name) {
this.id = id;
this.name = name;
} @Id
@GenericGenerator(name = "increment",strategy = "increment")
@GeneratedValue(generator = "increment")
public int getId() {
return id;
} public void setId(int id) {
this.id = id;
} @Column(name="name")
public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} @Override
public String toString() {
return "Group{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}

================================================BaseDao.java==============================================

package com.ssh.dao;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query; import javax.annotation.Resource;
import java.lang.reflect.ParameterizedType;
import java.util.List; public class BaseDao<T> implements IBaseDao<T> {
private SessionFactory sessionFactory; @Resource
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
} public Session getSession(){
return sessionFactory.openSession();
} @Override
public void add(T t) {
getSession().save(t);
} @Override
public void update(T t) {
getSession().update(t);
} @Override
public void delete(int id) {
getSession().delete(id);
} public Class<T> getCla(){
return (Class<T>)(((ParameterizedType)
(this.getClass().getGenericSuperclass()))
.getActualTypeArguments()[0]);
} @Override
public T load(int id) {
/*由于在load()方法中需要给一个类作为参数,但现在还不知道具体是哪个类,因此需要
一个得到类的方法getCla()
*/
//在这里若使用load()方法需要在web.xml里面配置OpenSessionInView的过滤器,若使用get()则不要
//return this.getHibernateTemplate().get(getCla(),id);
return getSession().load(getCla(),id);
} //查询集合
@Override
public List<T> list(String hql) {
Query query = getSession().createQuery(hql);
return query.list();
} //带参数的集合查询
@Override
public List<T> list(String hql, Object[] params) {
Query query = getSession().createQuery(hql);
//判断参数是否为空
if(params != null && params.length > 0){
for(int i=0; i<params.length; i++){
query.setParameter(i,params[i]);
}
}
return query.list();
} //带参数的分页查询
@Override
public List<T> list(String hql, Object[] params, int pageIndex, int pageSize) {
Query query = getSession().createQuery(hql);
//判断参数是否为空
if(params != null && params.length > 0) {
for (int i = 0; i < params.length; i++) {
query.setParameter(i, params[i]);
}
}
return query.setFirstResult(pageIndex).setMaxResults(pageSize).list();
} //获取总记录数
@Override
public Long count(String hql) {
return (Long) getSession().createQuery(hql).uniqueResult();
} @Override
public Long count(String hql, Object[] params) {
Query query = getSession().createQuery(hql);
//判断参数是否为空
if(params != null && params.length > 0) {
for (int i = 0; i < params.length; i++) {
query.setParameter(i, params[i]);
}
}
return (Long)query.uniqueResult();
}
}

================================================EmpDao.java==============================================
package com.ssh.dao;

import com.ssh.model.Employee;

public class EmpDao extends BaseDao<Employee> implements IEmpDao {
}

================================================GroupDao.java==============================================
package com.ssh.dao;
import com.ssh.model.Group;
import org.springframework.stereotype.Repository; @Repository
public class GroupDao extends BaseDao<Group> implements IGroupDao { }

================================================IBaseDao.java==============================================
package com.ssh.dao;

import java.util.List;

public interface IBaseDao<T> {
public void add(T t);
public void update(T t);
public void delete(int id);
public T load(int id);
public List<T> list(String hql);
public List<T> list(String hql, Object[] params);
public List<T> list(String hql, Object[] params, int pageIndex, int pageSize);
public Long count(String hql);
public Long count(String hql, Object[] params);
}

================================================IEmpDao.java==============================================

package com.ssh.dao;

import com.ssh.model.Employee;

public interface IEmpDao extends IBaseDao<Employee> {
}

================================================IGroupDao.java==============================================

package com.ssh.dao;

import com.ssh.model.Group;

public interface IGroupDao extends IBaseDao<Group>{
}

================================================GroupService.java==============================================

package com.ssh.service;

import com.ssh.dao.IGroupDao;
import com.ssh.model.Group;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.List; @Service
public class GroupService implements IGroupService {
private IGroupDao groupDao; @Resource
public void setGroupDao(IGroupDao groupDao) {
this.groupDao = groupDao;
} @Override
public void save(Group group) {
groupDao.add(group);
} @Override
public Group load(int id) {
return null;
} @Override
public List<Group> list(){
//此处的from后面只能写类名
String hql = "from Group";
return groupDao.list(hql);
} @Override
public List<Group> list(int pageIndex, int pageSize) {
String hql = "from Group";
return groupDao.list(hql,null,pageIndex,pageSize);
}
}

================================================IGroupService.java==============================================

package com.ssh.service;

import com.ssh.model.Group;
import java.util.List; public interface IGroupService {
public void save(Group group);
public Group load(int id);
//GroupService需要使用哪些方法只要在接口中添加即可
public List<Group> list();
public List<Group> list(int pageIndex, int pageSize);
}

================================================GroupController.java==============================================

package com.ssh.controller;

import com.ssh.model.Group;
import com.ssh.service.IGroupService;
import com.opensymphony.xwork2.ActionContext;
import org.springframework.stereotype.Controller;
import javax.annotation.Resource;
import java.util.List; @Controller("groupController")
public class GroupController {
private IGroupService groupService;
//需要保存哪些类的数据,就在这里定义哪些类来接收数据
private Group group;
private int pageIndex=1;
private int pageSize=2; public int getPageIndex() {
return pageIndex;
} public void setPageIndex(int pageIndex) {
this.pageIndex = pageIndex;
} public int getPageSize() {
return pageSize;
} public void setPageSize(int pageSize) {
this.pageSize = pageSize;
} public Group getGroup() {
return group;
} public void setGroup(Group group) {
this.group = group;
} @Resource
public void setGroupService(IGroupService groupService) {
this.groupService = groupService;
} public String add(){
groupService.save(group);
return "success";
} //分页查询
public String list(){
// List<Group> groups = groupService.list();
List<Group> groups = groupService.list(pageIndex,pageSize);
ActionContext.getContext().put("group",groups);
return "success";
}
}

===========================遇到的问题========================

java.lang.NullPointerException
com.ibeifeng.ssh.dao.BaseDao.getSession(BaseDao.java:13)
com.ibeifeng.ssh.dao.BaseDao.list(BaseDao.java:50)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:197)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction

(TransactionAspectSupport.java:294)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
com.sun.proxy.$Proxy37.list(Unknown Source)
com.ibeifeng.ssh.service.GroupService.list(GroupService.java:31)
com.ibeifeng.ssh.controller.GroupController.add(GroupController.java:31)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:897)
ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1299)
ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1375)
ognl.ASTMethod.getValueBody(ASTMethod.java:91)
ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
ognl.SimpleNode.getValue(SimpleNode.java:258)
ognl.Ognl.getValue(Ognl.java:470)
ognl.Ognl.getValue(Ognl.java:434)
com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:362)
com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:414)
com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:360)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)
org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept

(AnnotationValidationInterceptor.java:76)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:140)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:575)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
org.springframework.orm.hibernate5.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:152)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1139)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2555)
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2544)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Unknown Source)


解决方法:错误提示中显示BaseDao方法中,语句"return sessionFactory.openSession()"存在问题,经调试后发现是因为没有注册

sessionFactory变量的原因,给sessionFactory添加getter&setter方法


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