spring mvc+cookie，实现网站前后台语言切换

       <mvc:interceptors>  
                <!-- 国际化操作拦截器 如果采用基于（请求/Session/Cookie）则必需配置 --> 
                <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" />  
        </mvc:interceptors>

    <mvc:interceptors>
        <bean id="localeChangeInterceptor" class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
            <property name="paramName" value="lang" />
        </bean>
    </mvc:interceptors> 

<bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver" />

    <!-- 国际化资源文件 -->
    <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
        <property name="basename" value="messages" />
    </bean>

<%@taglib prefix="spring" uri="http://www.springframework.org/tags" %> 

<spring:message code="INDEX2"/>  //messages资源文件中配置的INDEX的值将在这里展示。

        <!-- 事务切面 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--中英切换数据源配置——————————————————————————start  -->
    <!--数据源 A-->
    <bean id="dataSourceCn" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
       <!-- 使用properties来配置 -->
        <property name="driverClassName">
            <value>com.mysql.jdbc.Driver</value>
        </property>
        <property name="url">
            <value>jdbc:mysql://xxx.xxx.x.x:xxx/xxx?useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF-8</value>
        </property>
        <property name="username">
            <value>xxx</value>
        </property>
        <property name="password">
            <value>xxxxx</value>
        </property>
    </bean>
    <!--数据源 B-->
    <bean id="dataSourceEn" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
       <!-- 使用properties来配置 -->
        <property name="driverClassName">
            <value>com.mysql.jdbc.Driver</value>
        </property>
        <property name="url">
            <value>${jdbcURL}</value>
        </property>
        <property name="username">
            <value>${jdbcUserName}</value>
        </property>
        <property name="password">
            <value>${jdbcPassword}</value>
        </property>
                
    </bean>
     <!--      数据源路由 -->
     <bean id="dataSource" class="com.jintuo.bean.DynamicDataSource">
        <property name="targetDataSources">
            <map key-type="java.lang.String">
                <entry key="dataSourceCn" value-ref="dataSourceCn"/>
                <entry key="dataSourceEn" value-ref="dataSourceEn"/>
            </map>
        </property>
         <!-- 默认数据源 -->
        <property name="defaultTargetDataSource" ref="dataSourceCn"/>
    </bean>
    <!-- 自动扫描了所有的XxxxMapper.xml对应的mapper接口文件，这样就不用一个一个手动配置Mpper的映射了，只要Mapper接口类和Mapper映射文件对应起来就可以了。 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage">
            <!-- <value>com.xide.dao.iface</value> -->
            <value>com.jintuo.dao.iface</value>
        </property>
     </bean>
    <!-- 配置Mybatis的文件 ，mapperLocations配置**Mapper.xml文件位置，configLocation配置mybatis-config文件位置-->
     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
         <property name="mapperLocations" value="classpath:com/jintuo/dao/mapper/*.xml"/>
       <!--  <property name="configLocation" value="classpath:mybatis/mybatis-config.xml" /> -->
       <!--  <property name="typeAliasesPackage" value="com.tiantian.ckeditor.model"/> -->  
           
    </bean>  
<!--中英切换数据源————————————————————end！ -->

    <!-- 使用C3P0数据源 -->
    <!--  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass">
            <value>com.mysql.jdbc.Driver</value>
        </property>
        <property name="jdbcUrl">
            <value>jdbc:mysql://xxx.xxx.x.xx:xxxx/xxxx?useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF-8</value>
        </property>
        <property name="user">
            <value>xxx</value>
        </property>
        <property name="password">
            <value>xxx</value>
        </property>
        <property name="maxPoolSize" value="100"></property>
        <property name="maxIdleTime" value="60"></property>  
        <property name="minPoolSize" value="10"></property>
        <property name="maxStatements" value="0"></property>
    </bean>  -->

public interface  DataSourceName {
       static final String DATA_EN="dataSourceEn";
       static final String DATA_CN="dataSourceCn";
}

public class DataSourceContextHolder {
    private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();  
      
    public static void setDbType(String dbType) {  
           contextHolder.set(dbType);  
    }  
 
    public static String getDbType() {  
           return ((String) contextHolder.get());
    }  
 
    public static void clearDbType() {  
           contextHolder.remove();  
    }

}

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

import util.DataSourceContextHolder;

public class DynamicDataSource extends AbstractRoutingDataSource {
     
    @Override
    protected Object determineCurrentLookupKey() {
        return DataSourceContextHolder.getDbType();
    }
 
}

public class CommonInterceptor extends HandlerInterceptorAdapter {
    
    private final Log log = LogFactory.getLog(CommonInterceptor.class);  

    /**  
     * 在业务处理器处理请求之前被调用  
     * 如果返回false  
     *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链 
     * 如果返回true  
     *    执行下一个拦截器,直到所有的拦截器都执行完毕  
     *    再执行被拦截的Controller  
     *    然后进入拦截器链,  
     *    从最后一个拦截器往回执行所有的postHandle()  
     *    接着再从最后一个拦截器往回执行所有的afterCompletion()  
     */
    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler) throws Exception {
          log.info("==============登陆拦截开始==================");
          String sessionId = request.getSession().getId();
          String Lang_code = request.getParameter("lang");
          System.out.println("lang_code!!!!!:"+request.getParameter("lang"));
          log.info("==============sessionID:"+sessionId+"==============");
         /* PersonnelVo user=UserUtils.findUserByCache(sessionId);
          if(user==null){
              log.info("====未登陆跳转到登陆页面===");
              response.addHeader("t", "111");
//              request.getRequestDispatcher("/upload.jsp").forward(request, response);
              response.sendRedirect("http://localhost/ssm_test/upload.jsp");
              return false;
          }*/
          log.info("==============登陆拦截结束==================");
          log.info("============数据源选择开始========");
         Cookie[] cooks=request.getCookies();  //获取cookie
          String lang="";
          if(cooks!=null){
          for (Cookie cookie : cooks) {  //从cookie中拿到标识
              System.out.println(cookie.getValue());
              if(cookie.getValue().equals("en")||cookie.getValue().equals("cn")){
                  lang=cookie.getValue();
                  //通过标识切换数据源
              }else{
                  lang="cn";
              }
           }
          }
          DataSourceContextHolder.setDbType(lang.equals("cn")?DataSourceName.DATA_CN:DataSourceName.DATA_EN);

        
          return true;
    }
}

var cookie={   //cookie工具类
    setCookie:function(c_name,value,expiredays){  //设值
        var exdate=new Date()
        exdate.setDate(exdate.getDate()+expiredays)
        document.cookie=c_name+ "=" +escape(value)+
        ((expiredays==null) ? "" : ";expires="+exdate.toGMTString())
    },
    getCookie:function(c_name){   //取值
        if (document.cookie.length>0)
          {
          c_start=document.cookie.indexOf(c_name + "=")
          if (c_start!=-1)
            { 
            c_start=c_start + c_name.length+1 
            c_end=document.cookie.indexOf(";",c_start)
            if (c_end==-1) c_end=document.cookie.length
            return unescape(document.cookie.substring(c_start,c_end))
            } 
          }
        return "";
    },
    checkCookie:function(){   //验证
        username=getCookie('username')
        if (username!=null && username!="")
          {alert('Welcome again '+username+'!')}
        else 
          {
          username=prompt('Please enter your name:',"")
          if (username!=null && username!="")
            {
            setCookie('username',username,365)
            }
          }
    }
}

var lang = cookie.getCookie("lang");
function changeZh(){  //中文切换
    cookie.setCookie("lang", "cn", 1);
    location.reload();

    
}
function changeEn(){  //英文切换
    cookie.setCookie("lang", "en", 1);
    location.reload();
}