mysql explain時，user表主鍵跟引用表（comment表）關聯，始終為all，原因是: user表有18萬條記錄，主鍵 `id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '用戶id', 而comment表的引用 `user_id` varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '評論用戶id', 字符集不相同位數也不同，引起的，查詢關聯不能按照主鍵關聯，始終為all級別 解決方法:把 字符集和位數調到一樣即可，一下從all級別調到了eq_ref 的級別

下載：


參考地址：

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進來
    web.xml 
    SpringMVC核心分發器 加入參數 <param-value>classpath:spring-mvc.xml</param-value>
    不加載    <param-value>classpath*:/spring-context*.xml</param-value>
    controller/service等都在mvc中加載
     <context:component-scan base-package="com.mweb.**.controller" />
    <context:component-scan base-package="com.mweb.**.service" />。。。。需要加載的@Component等
    加入：
     <aop:aspectj-autoproxy proxy-target-class="true" />

二、spring-context*.xml / spring-mvc.xml 分開加載掃描的方法 
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>    必須加入才行
 </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" />   掃描 controller

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

1. <aop:aspectj-autoproxy proxy-target-class="true">  
2.         <aop:include name="controllerAspect"/>     @Aspect聲明的類  
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" />
這樣就可以了

/*多條-刪除*/
function deleteBatch(){
 layer.confirm('確認要刪除嗎？',function(index){

   var idList = new Array(); 

   // 獲得選中的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(),//表單數據 
          data: {"idList":idList},
          //cache:false,
          success:function(msg){
              if(msg=="success"){
               // 延時1S刷新
               setTimeout('location.replace(location.href)', 1000);
            layer.msg('全部刪除成功!',{icon:1,time:1000});
              }
              if(msg=="error"){
                  layer.msg('異常!');
              }
          }
      });
 });
}

后臺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;
    }

后臺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);
 } 

如果不跳轉，應該把ajax里面的dataType改成html ，json時返回不正確

 

/** ajax登錄，并jquery md5 加密密碼 */
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("驗證碼無效！");
      }
     },
     error: function (XMLHttpRequest, textStatus, errorThrown) {
               alert(XMLHttpRequest.status);
               alert(XMLHttpRequest.readyState);
               alert(textStatus);
           }
 });
}

以上代碼中url為 loginsubmit.html 去掉".html"即可提交 ，后臺代碼用的@ResponseBody注解

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

spring-mvc.xml 中加入：
 <!-- 異常處理 -->
 <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>

如果還不能解決：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，應該就好了

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

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