Ultimatelly,I solved my problem.    My work is switch my application from mysql to sqlserver database .   At the very start,I forgot start sqlserver service,so the error "refused connect"  always appear,(so stupid error).Next,ther error  "Hibernate operation: could not execute query; uncategorized SQLException for SQL [select user0_.ID as ID, user0_.USERNAME as USERNAME0_, user0_.PASSWORD as PASSWORD0_ from user user0_]; SQL state [S1000]; error code [156]; 在关键字 'user' 附近有语法错误。; nested exception is java.sql.SQLException: 在关键字 'user' 附近有语法错误."   comes out ,  the problem scratchs my head over .this moring i got one friend's help and eventually found the "user" should not be used as a table name,because "user" is a key in sqlserver.  
      Below is work I have done : (Note: my env is eclipse+myeclipse)
      First:modify applicationContext.xml:
      
      From:
      1.<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
           <property name="driverClassName">
                 <value>com.mysql.jdbc.Driver</value>
           </property>
           <property name="url">
                <value>jdbc:mysql://localhost:3306/test</value>
           </property>
           <property name="username">
                <value>root</value>
           </property>
           <property name="password">
               <value>whl</value>
           </property>
        </bean>
     2. <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
     
     To:
        <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
              <property name="driverClassName">
                   <value>net.sourceforge.jtds.jdbc.Driver</value>
              </property>
              <property name="url">
                   <value>jdbc:jtds:sqlserver://localhost:1433/test</value>
               </property>
               <property name="username">
                    <value>sa</value>
               </property>
               <property name="password">
                    <value>mssqlsys</value>
              </property>
         </bean>

        <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
      Second: import the sqlserver driver:jtds-1.1.jar