mysql explain时，user表主键跟引用表（comment表）关联，始终为all，原因是: user表有18万条记录，主键 `id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '用户id', 而comment表的引用 `user_id` varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '评论用户id', 字符集不相同位数也不同，引起的，查询关联不能按照主键关联，始终为all级别 解决方法:把 字符集和位数调到一样即可，一下从all级别调到了eq_ref 的级别

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参考地址：

一、spring-context*.xml 合并到 spring-mvc.xml 的方法
    spring-servlet.xml 中加入 <import resource="ApplicationContext.xml" />
    ApplicationContext.xml 中把其它的xml文件import进来
    web.xml 
    SpringMVC核心分发器 加入参数 <param-value>classpath:spring-mvc.xml</param-value>
    不加载    <param-value>classpath*:/spring-context*.xml</param-value>
    controller/service等都在mvc中加载
     <context:component-scan base-package="com.mweb.**.controller" />
    <context:component-scan base-package="com.mweb.**.service" />。。。。需要加载的@Component等
    加入：
     <aop:aspectj-autoproxy proxy-target-class="true" />

二、spring-context*.xml / spring-mvc.xml 分开加载扫描的方法 
web.xml 中：
 <context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath*:/spring-context*.xml</param-value>
 </context-param>
 <listener> 
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    必须加入才行
 </listener>

 <servlet>
  <servlet-name>spring</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
  <load-on-startup>1</load-on-startup>
 </servlet>

spring-mvc.xml 中：

 <context:component-scan base-package="com.mweb.**.controller" />   扫描 controller

 <aop:aspectj-autoproxy />         aop 参考下面的也行

1. <aop:aspectj-autoproxy proxy-target-class="true">  
2.         <aop:include name="controllerAspect"/>     @Aspect声明的类  
3.     </aop:aspectj-autoproxy> 

 

spring-context.xml中：
     <context:component-scan base-package="com.mweb.**.extension,
                 com.mweb.**.service,
                 com.mweb.base.aspect,
                 com.mweb.base.shiro.realm" />
 <aop:aspectj-autoproxy proxy-target-class="true" />
这样就可以了

/*多条-删除*/
function deleteBatch(){
 layer.confirm('确认要删除吗？',function(index){

   var idList = new Array(); 

   // 获得选中的ID值
   $("input[name='id']:checkbox:checked").each(function(){
    idList.push(this.value); 
   });

   $.ajax({
          type:"post",
          url:"${CONTEXT_PATH}/sys/menu/deletebatch.html",
          data: $('#form-menu').serialize(),//表单数据 
          data: {"idList":idList},
          //cache:false,
          success:function(msg){
              if(msg=="success"){
               // 延时1S刷新
               setTimeout('location.replace(location.href)', 1000);
            layer.msg('全部删除成功!',{icon:1,time:1000});
              }
              if(msg=="error"){
                  layer.msg('异常!');
              }
          }
      });
 });
}

后台controller：
 @RequiresPermissions("sys:menu:edit")
    @ResponseBody
    @RequestMapping("/deletebatch")
    public String deletebatch(@RequestParam("idList[]") List<String> objs,ModelMap modelMap, HttpServletRequest request) throws Exception {
     String retStr = "error";
     try{
   menuService.removeMulti(objs);
   retStr = "success" ;
     }catch(Exception e) {
      logger.info(e.getMessage());
     }
     return retStr;
    }

后台service：

 @CacheEvict(value="defaultCache",allEntries=true)
 public void removeMulti(List<String> objs) {
  
  BasicDBList basicDBList=new BasicDBList();
  for(String id : objs) {
   basicDBList.add(new BasicDBObject("id",id));
  }

        DBObject obj =new BasicDBObject();
        obj.put("$or", basicDBList);
        Query query=new BasicQuery(obj);

  mongoTemplate.remove(query,Menu.class);
 } 

如果不跳转，应该把ajax里面的dataType改成html ，json时返回不正确

 

/** ajax登录，并jquery md5 加密密码 */
function loginsubmit() {
 var salt=$("#username").val(); 
    var pwd=$("#password").val();  
    var md5Pwd=$.md5(pwd+salt);
   
    var validateCode=$("#validateCode").val();
    var rememberMe=$("#rememberMe").val();
   
 data="username="+  salt
  + "&password=" + md5Pwd
  + "&validateCode=" + validateCode
  + "&rememberMe=" + rememberMe;

 $.ajax({
     type: "POST",
     url: "loginsubmit",
     dataType:'html',
     data: data,
     contentType:"application/x-www-form-urlencoded;charset=UTF-8",
     success: function(msg){
      if(msg=="ok") {
       location.href = "index";
      }else if (msg=="errorcode"){
       alert("验证码无效！");
      }
     },
     error: function (XMLHttpRequest, textStatus, errorThrown) {
               alert(XMLHttpRequest.status);
               alert(XMLHttpRequest.readyState);
               alert(textStatus);
           }
 });
}

以上代码中url为 loginsubmit.html 去掉".html"即可提交 ，后台代码用的@ResponseBody注解

<property name="unauthorizedUrl" value="/sys/unauthorized"/> 不起作用

spring-mvc.xml 中加入：
 <!-- 异常处理 -->
 <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
  <property name="exceptionMappings">
   <props>
    <prop key="org.apache.shiro.authz.UnauthorizedException">jsp/unauthorized</prop>
    <prop key="org.apache.shiro.authz.UnauthenticatedException">jsp/unauthorized</prop>
    <prop key="org.apache.shiro.authz.AuthorizationException">jsp/unauthorized</prop>           
    <prop key="java.lang.Throwable">jsp/unauthorized</prop>
   </props>
   </property>
 </bean>

如果还不能解决：可以看一下web.xml中是否有：
 <error-page>
  <error-code>400</error-code>
  <location>/WEB-INF/template/common/errorPage.jsp</location>
 </error-page>
 <error-page>
  <error-code>404</error-code>
  <location>/WEB-INF/template/common/errorPage.jsp</location>
 </error-page>
 <error-page>
  <error-code>500</error-code>
  <location>/sys/unauthorized.html</location>
 </error-page>
都屏蔽掉，应该就好了

在context.xml 中加入红色的
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>

    <Resources cachingAllowed="true" cacheMaxSize="100000" />