ssh整合思想 Spring与Hibernate的整合 项目在服务器启动则自动创建数据库表

Spring整合Hibernate

Spring的Web项目中，web.xml文件会自动加载，以出现欢迎首页。也可以在这个文件中对Spring的配置文件进行监听，自启动配置文件，

以及之前Struts2框架必备的启动过滤器StrutsPrepareAndExecuteFilter

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>2017-12-30_SSH</display-name>

  <!-- 监听的文件名 -->
  <context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:bean.xml</param-value>
  </context-param>

    <!-- 服务器启动自动加载XML配置文件 监听器 -->
    <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

      <!-- structs2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>

  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

在Spring的核心配置文件中，进行数据库连接池配置，建立sessionFactory对象，直接dao操作，也可以在Spring配置文件中配置Struts2的Action对象

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

    <!-- c3p0连接池得到dataSource -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/lastday"></property>
        <property name="user" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

    <bean id="userAction" class="com.swift.action.UserAction" scope="prototype"></bean>

    <bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
    <!-- Hibernate核心配置文件没有连接数据库，所以需要注入 -->
    <property name="dataSource" ref="dataSource"></property>
    <!-- Hibernate核心配置文件的位置 -->
    <property name="configLocations" value="classpath:hibernate.cfg.xml"></property>
    </bean>

</beans>

Hibernate的核心配置文件中，不需要在写连接数据库的属性，因为已经在Spring的配置文件中用连接池了

<?xml version="1.0" encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/sw_database</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">root</property> -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL57Dialect</property>

        <property name="hibernate.show_sql">true</property>

        <!-- create: 先删表，再建表。 create-drop: 启动时建表，退出前删表。 update: 如果表结构不一致，就创建或更新。
            validate: 启动时验证表结构，如果不致就抛异常。 -->
        <property name="hibernate.hbm2ddl.auto">update</property>

        <!--指定映射文件，可映射多个映射文件 -->
        <mapping resource="com/swift/entity/User.hbm.xml"></mapping>
    </session-factory>
</hibernate-configuration>  

Hibernate的这个核心配置文件需要实体类映射文件，体现映射关系

<?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">
    <!-- 实体类映射文件 -->
<hibernate-mapping>

    <class name="com.swift.entity.User" table="t_user">
        <!-- 主键 -->
        <id name="uid">
            <generator class="native"></generator>
        </id>
        <!-- 其他属性 -->
        <property name="username"/>
        <property name="address"/>
    </class>

</hibernate-mapping>

实体类的属性设置setter和getter方法即可

package com.swift.entity;

public class User {

    private Integer uid;
    private String username;
    private String address;
    public Integer getUid() {
        return uid;
    }
    public void setUid(Integer uid) {
        this.uid = uid;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }

}

Struts2的UserAction类代码

package com.swift.action;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport {

    @Override
    public String execute() throws Exception {
        System.out.println("action..................");
        return NONE;
    }

}

需要继承ActionSupport类，覆写execute()方法

在浏览器中运行项目后的地址，加上对象名.action（如userAction.action）就可以了

<?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>
    <package name="default" extends="struts-default" namespace="/">

    <!-- action的class不要写全名会创建两个对象，而写Spring配置文件中id的内容，只建一个对象
                  前提有struts2-spring-plugin-2.3.4.1.jar -->

        <action name="userAction" class="userAction">
        </action>
    </package>
</struts>