SSH整合

上次分别讲解了一下strut2和spring的整合，spring和hibernate的整

合，接下来就是struts2，spring和hibernate三大框架的整合了。

现在SSH框架用的人还是比较多，但springmvc 和springboot框架使用力度也比较大了，等有时间了，我会更新一些关于springmvc的使用教程。

SSH整合的步骤：

一：加入jar包

二：编写struts2的配置文件：

<?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.enable.DynamicMethodInvocation" value="true"></constant>        <package name="default" extends="struts-default">            <action name="emp-*" class="employaction" method="{1}">            <result name="employerlist">employ_list.jsp</result>            </action>        </package>    </struts>

spring配置文件：

<?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/beans http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">    <!-- 导入配置文件 -->    <context:property-placeholder location="classpath:db.properties"/>    <!-- 配置连接池 -->    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">        <property name="user" value="${jdbc.user}"></property>        <property name="password" value="${jdbc.password}"></property>        <property name="driverClass" value="${jdbc.driverClass}"></property>        <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>        <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>        <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>    </bean>    <!-- 配置sessionfactory -->    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">        <property name="dataSource" ref="dataSource"></property>        <property name="configLocation" value="classpath:hibernate.cfg.xml"></property>        <property name="mappingLocations" value="classpath:com/ssh/en/*.hbm.xml"></property>    </bean>    <!-- 配置spring申明式事务 -->    <!-- 配置hibernate的事务管理器 -->    <bean id="TransactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">            <property name="sessionFactory" ref="sessionFactory"></property>    </bean>    <!-- 配置事务属性 -->    <tx:advice id="txAdvice" transaction-manager="TransactionManager">        <tx:attributes>            <tx:method name="get*" read-only="true"/>            <tx:method name="*"/>        </tx:attributes>    </tx:advice>    <!-- 配置事务切入点 -->    <aop:config>        <aop:pointcut expression="execution(* com.ssh.service.*.*(..))" id="txPointcut"/>        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>    </aop:config>    <bean id="employdao" class="com.ssh.dao.Employerdao">        <property name="sessionFactory" ref="sessionFactory"></property>    </bean>    <bean id="employservice" class="com.ssh.service.Employservice">        <property name="employdao" ref="employdao"></property>    </bean>    <bean id="employaction" class="com.ssh.action.Employer">        <property name="employerservice" ref="employservice"></property>    </bean></beans>

hibernate的配置文件：

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-configuration PUBLIC        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration>    <session-factory>    <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>    <property name="hibernate.show_sql">true</property>    <property name="hibernate.format_sql">true</property>    <property name="hbm2ddl.auto">update</property>    </session-factory></hibernate-configuration>

web.xml配置文件：

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  <display-name>SSHTest</display-name>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>    </welcome-file-list>    <!-- 配置spring的监听器 -->    <!-- needed for ContextLoaderListener -->    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath:ApplicationContext.xml</param-value>    </context-param>    <!-- Bootstraps the root web application context before servlet initialization -->    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>    <!-- 配置struts2的过滤器 -->    <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>

三大框架的整合就主要体现在上面的配置文件上了

下面是示例代码：

实体类：

package com.ssh.en;import java.util.Date;public class employ {    private Integer id;    private String employName;    private String email;    private Date birthday;    private Date createTime;    private Department department;    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getEmployName() {        return employName;    }    public void setEmployName(String employName) {        this.employName = employName;    }    public String getEmail() {        return email;    }    public void setEmail(String email) {        this.email = email;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    public Date getCreateTime() {        return createTime;    }    public void setCreateTime(Date createTime) {        this.createTime = createTime;    }    public Department getDepartment() {        return department;    }    public void setDepartment(Department department) {        this.department = department;    }}

映射文件：

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!-- Generated 2017-8-23 18:23:12 by Hibernate Tools 3.5.0.Final --><hibernate-mapping>    <class name="com.ssh.en.employ" table="SSH_EMPLOY">        <id name="id" type="java.lang.Integer">            <column name="ID" />            <generator class="native" />        </id>        <property name="employName" type="java.lang.String">            <column name="EMPLOY_NAME" />        </property>        <property name="email" type="java.lang.String">            <column name="EMAIL" />        </property>        <property name="birthday" type="java.util.Date">            <column name="BIRTHDAY" />        </property>        <property name="createTime" type="java.util.Date">            <column name="CREATETIME" />        </property>        <many-to-one name="department" class="com.ssh.en.Department" lazy="false">            <column name="DEPARTMENT_ID" />        </many-to-one>    </class></hibernate-mapping>

实体类：

package com.ssh.en;public class Department {   private Integer id;   private String departmentName;public Integer getId() {    return id;}public void setId(Integer id) {    this.id = id;}public String getDepartmentName() {    return departmentName;}public void setDepartmentName(String departmentName) {    this.departmentName = departmentName;}}

映射文件：

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!-- Generated 2017-8-23 18:23:12 by Hibernate Tools 3.5.0.Final --><hibernate-mapping>    <class name="com.ssh.en.Department" table="SSH_DEPARTMENT">        <id name="id" type="java.lang.Integer">            <column name="DEPARTMENT_ID" />            <generator class="native" />        </id>        <property name="departmentName" type="java.lang.String">            <column name="DEPARTMENT_NAME" />        </property>    </class></hibernate-mapping>

dao层：

package com.ssh.dao;import java.util.List;import org.hibernate.Session;import org.hibernate.SessionFactory;import com.ssh.en.employ;public class Employerdao {    private SessionFactory sessionfactory;    public void setSessionFactory(SessionFactory sessionfactory)    {        this.sessionfactory=sessionfactory;        if(sessionfactory==null)        {            System.out.println("dao层中的sessionfactory为空");        }        System.out.println(sessionfactory+"sessionfactory对象被加载到dao中........");    }    public Session getSession()    {        Session session= sessionfactory.getCurrentSession();  //获得当前session        if(session==null)        {            System.out.println("当前获得的session为空");        }        return session;    }    public List<employ> GetAll()    {        String hql="FROM employ";        return getSession().createQuery(hql).list();    }}

service层：

package com.ssh.service;import java.util.List;import com.ssh.dao.Employerdao;import com.ssh.en.employ;public class Employservice {    private Employerdao employdao;    public Employerdao getEmploydao() {        return employdao;    }    public void setEmploydao(Employerdao employdao) {        this.employdao = employdao;        if(employdao==null)        {            System.out.println("service层中的dao对象为空");        }        System.out.println(employdao+"employdao对象被加载到service中........");    }    public List<employ> getAll()    {        return employdao.GetAll();    }}

action：

package com.ssh.action;import java.util.List;import java.util.Map;import org.apache.struts2.interceptor.RequestAware;import com.opensymphony.xwork2.ActionSupport;import com.ssh.en.employ;import com.ssh.service.Employservice;public class Employer extends ActionSupport implements RequestAware{    private static final long serialVersionUID = 1L;    private Employservice employerservice;    private Map<String, Object> request;    public Employservice getEmployerservice() {        return employerservice;    }    public void setEmployerservice(Employservice employerservice) {        this.employerservice = employerservice;        if(this.employerservice==null)        {            System.out.println("action中的service对象为空");        }        System.out.println("action中的employservice被初始化为"+employerservice);    }    public String employerlist()    {        List<employ> employlist = employerservice.getAll();        System.out.println(employlist.size());        request.put("list", employlist);        return "employerlist";    }    @Override    public void setRequest(Map<String, Object> arg0) {        this.request=arg0;    }}

SSH框架的整合就上面的一些东西了

在整合的时候，可能会遇到下面的一些异常：

重: Exception occurred during processing request: Could not open Hibernate Session for transaction; nested exception is java.lang.NoClassDefFoundError: org/hibernate/engine/transaction/spi/TransactionContextorg.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is java.lang.NoClassDefFoundError: org/hibernate/engine/transaction/spi/TransactionContext

引起这个异常的原因不止一个 ，但有可能是jar包的版本问题

将hibernate-core-5.2.8.Final.jar换成hibernate-core-4.2.4.Final.jar就好了

第二异常：

：action层中的service对象注入成功之后，但是在action中的处理方法中service层的对象为空

这个问题的原因在strut2的配置文件中的action的类名应该写为在springbean配置文件中action类的id号

第三个异常：

Method "list" failed for object com.ssh.action.Employer@6cfe145b [java.lang.NoClassDefFoundError: javassist/util/proxy/Proxy]

这个问题也是jar包版本问题，把javassist.jar包的版本换成4.3版本就好了。