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SSH框架的简化(struts2、spring4、hibernate5)

时间:2016-10-16 21:31:24      阅读:325      评论:0      收藏:0      [点我收藏+]

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目的:

   在上次的基础下,对ssh框架进行简化。

  1、本文提纲:本文通过一个新闻管理系统的实例来简化ssh框架的代码编写,功能包括查询数据库中所有新闻信息,删除某条新闻信息。

    2、本项目的搭建环境:Windows 8-64位,Eclipse(开发工具),jdk1.8.0_91,Tomcat 8.0 ,mysql数据库。

 

第一步:在eclipse里创建web项目 (news)

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第二步:导入本次项目要使用到的jar包

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第三步:在配置文件web.xml配置一个struts2的过滤器和spring监听器。

1 <?xml version="1.0" encoding="UTF-8"?>
 2 <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">
 3   <display-name>news</display-name>
 4   <welcome-file-list>
 5     <welcome-file>default.jsp</welcome-file>
 6   </welcome-file-list>
 7   
 8   <!-- struts2过滤器 -->
 9   <filter>
10     <filter-name>struts2</filter-name>
11     <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
12   </filter>
13   <filter-mapping>
14     <filter-name>struts2</filter-name>
15     <url-pattern>/*</url-pattern>
16   </filter-mapping>、
17   
18   <!-- spring监听器 -->
19   <context-param>
20     <param-name>contextConfigLocation</param-name>
21     <param-value>classpath:applicationContext.xml</param-value>
22   </context-param>
23   <listener>
24     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
25   </listener>
26 </web-app>

第四步: 在src下建包 ,配置文件

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第五步: 创建实体类

 

News(实体类):

 1 package news.entity;
 2 
 3 import java.util.Date;
 4 
 5 /*
 6  * 跟数据库表一致,作为一个java对象
 7  * 1个对象代表的是数据库表中的一行记录
 8  * 1个属性代表的是表中的一个字段
 9  */
10 public class News {
11     private Integer id;      //新闻编号
12     private String title;     //新闻标题
13     private String content;  //新闻内容
14     private Date begintime;  //发布时间
15     private String username; //作者
16     
17     //创建get()和set()方法
18     public Integer getId() {
19         return id;
20     }
21     public void setId(Integer id) {
22         this.id = id;
23     }
24     public String getTitle() {
25         return title;
26     }
27     public void setTitle(String title) {
28         this.title = title;
29     }
30     public String getContent() {
31         return content;
32     }
33     public void setContent(String content) {
34         this.content = content;
35     }
36     public Date getBegintime() {
37         return begintime;
38     }
39     public void setBegintime(Date begintime) {
40         this.begintime = begintime;
41     }
42     public String getUsername() {
43         return username;
44     }
45     public void setUsername(String username) {
46         this.username = username;
47     }
48     
49 }

News.hbm.xml(映射文件):

<?xml version="1.0" encoding="UTF-8"?>
<hibernate-mapping xmlns="http://www.hibernate.org/xsd/hibernate-mapping">
  
     <class name="news.entity.News" table="news">
        <id name="id" column="id">
            <generator class="native"></generator>
        </id>
        <property name="title" type="string" length="50" column="title" not-null="true"></property>
        <property name="content" type="text" length="50000" column="content" not-null="true"></property>
        <property name="begintime" type="date" column="begintime" not-null="true"></property>
        <property name="username" type="string" length="20" column="username" not-null="true"></property>
    </class>
</hibernate-mapping>

NewsService(接口类):

package news_service;

import java.util.List;

public interface NewsService {
	//查询 显示所有数据
	public List showAllNews();
	//删除单个数据
	public String deleteNews(Integer id);
}

NewsServiceImpl(实现类):注:有背景颜色的代码,就是注解,它代替里applicationContext.xml文件里的 托管实例bean标签删除。详细见下图,

package news_service;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import news_dao.NewsDao;

  @Service
  @Scope("prototype")

public class NewsServiceImpl implements NewsService {

 @Autowired
 private NewsDao nd;

public List showAllNews() {
        List allnews =nd.showAllNews();
        return allnews;
    }

    public String deleteNews(Integer id) {
        String deleteOK =nd.deleteNews(id);
        return deleteOK;
    }

}

下图:applicationContext.xml 的代码都不需要了 将用注解代替,@Service 代替bean , @Autowired 代替 property

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 NewsDao(接口类):

package news.dao;

import java.util.List;

public interface NewsDao {
    public List showAllNews();
    //显示首页所有数据(查询使用的。PS:本例没用到)
    public String findNews();
    public String deleteSingleNews(Integer id);
}

NewsDaoImpl(实现类):注;有背景颜色的代码,就是注解 ,在Dao里 @Repository代替bean 

package news.dao;

import java.util.List;

import javax.annotation.Resource;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Repository;

import news.entity.News;
@Repository
@Scope("prototype")
public class NewsDaoImpl implements NewsDao {
    @Autowired
    private SessionFactory sf;
    
    @Override
    public List<News> showAllNews() {
        Session session =sf.openSession();
        session.getTransaction().begin();
        Query query =session.createQuery("from News");
        session.getTransaction().commit();
        List<News> allNews =query.getResultList();
        
        return allNews;
    }

    @Override
    public String deleteNews(Integer id) {

    Session session = sf.openSession();
    //Session session = sf.getCurrentSession();//它会与事务关联,并且在事务后自动关闭
    Query query = session.createQuery("from News where id=:myid");

    //query.setParameter(0, id);
    query.setParameter("myid", id);
    List<News> deleteList = query.getResultList();
    //如果搜索出来是1条,就删除,如果是0条就不管了
    if ( deleteList.size()==1 ) {
    News news = deleteList.get(0);
    System.out.println("删除对象:"+news.getTitle()+ " Id:"+news.getId());
    session.getTransaction().begin();
    session.delete(news);
    session.getTransaction().commit();
    session.close();
    //sessionFactory关闭策略
    //1.坚持使用数据库连接池(例如C3P0)
    //2.sessionFactory就不关闭,而使用hibernate事务自动关闭功能
    // 说明:sf.openSession(); 必须关闭
    // sf.openSession(); 改为:sf.getCurrentSession();
    //getCurrentSession创建的线程会在事务提交或者事务回滚后自动关闭
    //sf.close();

    return "deleteOK";


    }

}

编写NewsAction(action类)。

 package news.action;
 2 
 3 import java.util.List;
 4 
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.context.annotation.Scope;
 7 import org.springframework.stereotype.Controller;
 8 
 9 import com.opensymphony.xwork2.ActionSupport;
10 
11 import news.entity.News;
12 import news.service.NewsService;
13 
14 //创建NewsAction(action类)继承ActionSupport接口
15 //使用@Controller类注解自动注入,并且为非单例
16 @Controller
17 @Scope("prototype")
18 public class NewsAction extends ActionSupport {
19     
20     //获取从客户端传递过来的值
21     private Integer id;
22     
23     //strtus自动的赋值
24     public void setId(Integer id) {
25         this.id = id;
26     }
27     
28     //使用spring内置注解@Autowired自动注入实例
29     @Autowired
30     private NewsService ns;
31     
32     private List<News> allNewList;
33     
34     public List<News> getAllNewList() {
35         return allNewList;
36     }
37     
38     public void setAllNewList(List<News> allNewList) {
39         this.allNewList = allNewList;
40     }
41 
42     //查询出所有数据
43     public String showAllNews(){
44         
45         allNewList=ns.showAllNews();
46         
47         return "success";
48     }
49     
55     
56     //删除某条数据
57     public String deleteSingleNews(){
58         
59         System.out.println("客户端传过来的id值是:"+id);
60         
61         String returnValue=ns.deleteSingleNews(id);
62         
63         return returnValue;
64     }
65 }

struts.xml:

 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 <!-- 上面的头,注意版本,从样例里复制过来 showcase.war\WEB-INF\src\java\struts.xml -->
 6     
 7 <struts>
 8      <!-- 告知Struts2运行时使用Spring来创建对象 -->
 9     <constant name="struts.objectFactory" value="spring"></constant>
10     <!-- 第1步:先定义一个包 -->
11     <package name="mynews" extends="struts-default">
12         <!-- 第2步:定义一个action,配置跳转信息 name 类似于Servlet  注:这里使用了通配符来指定调用的方法-->
13         <action name="NewsAction_*" class="newsAction" method="{1}">
14             <!-- 跳转是forward/WEB-INF/是防止jsp不经过action就可以访问-->
15             <!-- result接收返回的字符串,然后做对应的事情 -->
16             <result name="success">/WEB-INF/jsp/NewsIndex.jsp</result>
17             <!-- 删除后通过type="redirectAction"这个类型重新跳转到NewsAction_showAllNews.action刷新页面 -->
18             <result name="deleteOK" type="redirectAction">NewsAction_showAllNews.action</result>
19         </action>
20     </package>
21 </struts>

简化后的 applicationContext.xml:

 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
 4     xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
 6     xsi:schemaLocation="    
 7             http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd  
 8             http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd  
 9             http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
10             http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.2.xsd  
11             http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">
12 
13     <!-- spring注解自动注入 -->
14     <context:component-scan base-package="news"></context:component-scan>
15     
16     <!-- 引入外部属性文件 -->
17     <context:property-placeholder location="classpath:jdbc.properties" />
18     <!-- 添加sessionFactory bane ,注意,该类是Spring提供的 -->
19     <bean id="sessionFactory"
20         class="org.springframework.orm.hibernate5.LocalSessionFactoryBean" scope="prototype">
21         <!-- 注入连接池,包含了数据库用户名,密码等等信息 -->
22         <property name="dataSource" ref="myDataSource" />
23 
24         <!-- 配置Hibernate的其他的属性 -->
25         <property name="hibernateProperties">
26             <props>
27                 <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
28                 <prop key="hibernate.show_sql">true</prop>
29                 <prop key="hibernate.format_sql">true</prop>
30                 <prop key="hibernate.connection.autocommit">false</prop>
31                 <!-- 开机自动生成表 -->
32                 <prop key="hibernate.hbm2ddl.auto">update</prop>
33             </props>
34         </property>
35         <property name="mappingResources">
36             <list>
37                 <!-- 引用News.hbm.xml映射文件 -->
38                 <value>news/entity/News.hbm.xml</value>
39             </list>
40         </property>
41     </bean>
42     
43     <!-- 添加c3p0数据库连接池 bean -->
44     <bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
45         <!-- 数据库连接配置 -->
46         <property name="driverClass" value="${jdbc.driver}" />
47         <property name="jdbcUrl" value="${jdbc.url}" />
48         <property name="user" value="${jdbc.user}" />
49         <property name="password" value="${jdbc.password}" />
50         <!-- 每300秒检查所有连接池中的空闲连接 -->
51         <property name="idleConnectionTestPeriod" value="300"></property>
52         <!-- 最大空闲时间,900秒内未使用则连接被丢弃。若为0则永不丢弃 -->
53         <property name="maxIdleTime" value="900"></property>
54         <!-- 最大连接数 -->
55         <property name="maxPoolSize" value="2"></property>
56     </bean>
57 </beans>

总结:通过对本例项目搭建到功能的编写,使用注解的方式简化了ssh框架代码编写,对实例和类直接用注解注入。

 

SSH框架的简化(struts2、spring4、hibernate5)

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原文地址:http://www.cnblogs.com/zhaowancheng/p/5967641.html

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