一、在页面中国保留原来的值，跟修改之后的做比较

     1、要校验的字段

<div class="form-group"><div class="row"><div class="col-sm-12"><label class="col-sm-3 control-label">分类名称</label><div class="col-sm-6"><input type="text" name="name" id="name" value="${courseClassify.name}" class="form-control" maxlength="200" placeholder="请输入" /></div></div></div></div>

      2、原来的值

<input type="hidden" id="oldName" value="${courseClassify.name}">

   3、使用validate进行校验

$("#inputForm").validate({rules: {name:{remote: {type: "get",dataType: "json",url: "${base}/admin/course_classify/check_name.jhtml",data: {name: function () {return $("#name").val();},oldname:function () {return $("#oldName").attr();},}}}},messages: {name:{remote: "该分类名称已经存在"}}});

    4、controller处理

 /*** 检查分类名称是否存在*/@RequestMapping(value = "/check_name", method = {RequestMethod.GET})@ResponseBodypublic boolean checkAccount(String name,String oldname) {if(oldname != null){if (StringUtils.isEmpty(name)) {return true;}if (StringUtils.isEmpty(oldname)) {return true;}if (name.equals(oldname)) {return true;}}Long count = this.courseClassifyService.count(Paramap.create().put("name", name));if (null != count && count > 0) {return false;} else {return true;}}

二、在前端直接把id值携带到controller层，在根据id排除数据本身       

        1、验证的字段

<div class="form-group"><div class="row"><div class="col-sm-12"><label class="col-sm-3 control-label">手机号</label><div class="col-sm-6"><input type="text" name="phone" id="phone" data-id="${appUser.id}"  value="${appUser.phone}" class="form-control" required maxlength="200" oninput = "value=value.replace(/1[34578]\\d{9}/g,'')"/></div></div></div></div>

      2、获取id

<input type="hidden" value="${appUser.id}" name="id" id="userId"/>

      3、ajax传值

 rules: {phone: {remote: {type: "get",dataType: "json",url: "${base}/admin/app_user/check_phone.jhtml",data: {phone: function () {return $("#phone").val();},userId: function () {return $("#userId").val();},}}}},messages: {phone: {required: "请输入账号",maxlength: "账号最多11个字符",remote: "账号已经存在"}}

        4、controller层处理    

/*** 检查手机号是否存在*/@RequestMapping(value = "/check_phone", method = {RequestMethod.GET})@ResponseBodypublic boolean checkAccount(String phone,Long userId) {Long count=null;if (userId != null){//编辑count = this.appUserService.countAppUser(phone,userId);}else if(userId==null) {count = this.appUserService.count(Paramap.create().put("phone", phone));}if (null != count && count > 0) {return false;} else {return true;}}

        5、除去数据本身，来进行比较 

 SELECTCOUNT(*)FROMt_app_userWHEREphone=#{phone}ANDidNOT IN (#{id})