s2sh框架搭建(辅助工具：MyEclipse)及解决一些遇到的问题

2022-01-21 03:48:27

1.新建一个web project

2.首先生成Hibernate Facet

3.Hibernate Facet 安装步骤

4.然后是spring facet安装步骤

5.最后是struts facet 的配置

6.最后的整体布局如下所示

7.在服务器上运行，发现如下错误：

严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.service.UnknownUnwrapTypeException: Cannot unwrap to requested type [javax.sql.DataSource]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1455)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    ........

主要是没有在applicationContext.xml中配置 DataSource 这个bean，配置好后将其注入sessionFactory

<!--新加入 datasource -->
      <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/hjzgg_test?characterEncoding=UTF-8" />
        <property name="username" value="root" />
        <property name="password" value="hjzgg5211314" />
      </bean>
    
    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="configLocation"
            value="classpath:hibernate.cfg.xml">
        </property>
        <!--新加入 将dataSource注入到sessionFactory中 -->
        <property name="dataSource" ref="dataSource"></property>
        
        <property name="hibernateProperties">
            <value>
                hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
                hibernate.hbm2ddl.auto=update
                hibernate.show_sql=true
                hibernate.format_sql=false
                hibernate.cache.use_second_level_cache=true
                hibernate.cache.use_query_cache=false
                hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
                hibernate.current_session_context_class=thread <!-- 解决Hibernate4 No Session found for current thread -->
</value> </property>

8.新建PersonDao（DAO层），它的实现类PersonDaoImpl，以及 Action类 LoginAction

在applicationContext.xml中添加如下代码：

　　　　<bean id="personDao" class="com.xunchang.PersonDaoImpl">
            <!-- 采用依赖注入传入SessionFactory的引用 -->
            <property name="sessionFactory" ref="sessionFactory"/>
      </bean>
      <bean id="login" class="com.xunchang.LoginAction">       
            <property name="personDao" ref="personDao"/>
      </bean>

9.POJO 与 hibernate层：新建POJO(普通java类，对于每一个变量拥有getter 和 setter方法)，新建映射hibernate持久化类person.cfg.xml文件如下：

<?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">
<hibernate-mapping package="com.xunchang">
        <class name="Person" table="home402">
            <!-- 定义持久化类的表示属性 -->
            <id name="personId" column="personId" type="java.lang.Integer">
                <!-- 定义主键生成策略 -->
                <generator class="identity"/>
            </id>
            <property name="person_name" column="person_name" type="java.lang.String"/>
            <property name="person_age" column="person_age" type="java.lang.Integer"/>
        </class>
</hibernate-mapping>

然后在applicationContext.xml中的sessionFactory（bean）中加载该映射文件如下：

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="configLocation"
            value="classpath:hibernate.cfg.xml">
        </property>
        <!--新加入 将dataSource注入到sessionFactory中 -->
        .......
        ......
         <!--通过配置文件的方式获取数据源-->
        <property name="mappingResources">
            <list>
               <!-- 以下用来列出所有的PO映射文件 -->
               <value>person.cfg.xml</value>
            </list>
        </property>       
    </bean>

10.运行服务器，问题又来了，如下：

org.hibernate.HibernateException: <span style="color: #ff0000;">No Session found for current thread</span>
    org.springframework.orm.hibernate4.SpringSessionContext.currentSession(SpringSessionContext.java:97)
    org.hibernate.internal.SessionFactoryImpl<span style="color: #ff0000;">.getCurrentSession(SessionFactoryImpl.java:1041)</span>
    com.xunchang.PersonDaoImpl.getSession(PersonDaoImpl.java:16)
    com.xunchang.PersonDaoImpl.findAllPerson(PersonDaoImpl.java:63)
    com.xunchang.LoginAction.execute(LoginAction.java:20)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Hibernate4 No Session found for current thread原因：　 http://www.yihaomen.com/article/java/466.htm

解决方法：在applicationContext.xml中的sessionFactory 中<property name="hibernateProperties"></property>加入 hibernate.current_session_context_class=thread

<property name="hibernateProperties">
            <value>
                ......
                hibernate.current_session_context_class=thread <!-- 解决Hibernate4 No Session found for current thread -->
 </value> </property>

11.最后一个问题就是hibernate 中文乱码，解决方案如下：

//写一个字符集过滤器
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
public   class   SetCharacterEncodingFilter   extends   HttpServlet   implements   Filter  {
   public   void   doFilter(ServletRequest   request,   ServletResponse   response,   FilterChain   chain)  throws   ServletException,   IOException   { 
        request.setCharacterEncoding("utf-8"); 
        response.setContentType("text/html;charset=utf-8"); 
        chain.doFilter(request,   response); 
   } 
   
   public   void   init(FilterConfig   config)   throws   ServletException{ 
   } 
  
   public   void   destroy(){ 
   }  
}

//在web.xml中加入如下代码，问题解决
<filter>
    	　　<filter-name>encodingFilter</filter-name>
	    　　<filter-class>com.xunchang.SetCharacterEncodingFilter</filter-class>
  </filter>
  <filter-mapping> 
       　　<filter-name>encodingFilter</filter-name> 
       　　<url-pattern>/*</url-pattern>  
  </filter-mapping>

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