一、编写service，修改数据要根据ID回显数据

　　//根据ID查询    public Brand findById(Long id);    //修改    public int update(Brand brand);二、编写serviceImpl

@Overridepublic Brand findById(Long id) {    return brandDao.selectByPrimaryKey(id);}

@Overridepublic int update(Brand brand) {    return brandDao.updateByPrimaryKeySelective(brand);}三、编写controller，修改返回Result类型

//根据ID查询回显数据//    @RequestMapping("/findById")    @RequestMapping("/{id}")//    public Brand findById(Long id){    public Brand findById(@PathVariable(value = "id")Long id){        return brandService.findById(id);    }    //修改    @RequestMapping("/update")    public Result update(@RequestBody Brand brand){        int id = brandService.update(brand);        if (id>0){            return new Result(true,"修改成功");        }else {            return new Result(false,"修改失败");        }    }

四、编写页面html

//添加保存$scope.save=function () {   var url="../brand/save.do"; //判断是添加还是修改，添加$scope.entity.id==null，否则执行修改   if ($scope.entity.id!=null){      url="../brand/update.do"   } //发送请求$http.post(url,$scope.entity)，第一个参数是请求地址，第二个参数是提交的数据   $http.post(url,$scope.entity).success(function (response) {      if(response.success){         //重新加载         return $scope.reloadList();      }else {         alert(response.message);      }   });}//根据ID回显数据$scope.findById=function (id) {   // $http.get('../brand/findById.do?id='+id).success(function (response) {   $http.get('../brand/'+id+'.do').success(function (response) {      $scope.entity=response;   });}

<td class="text-center">   <button type="button" class="btn bg-olive btn-xs" data-toggle="modal"         data-target="#editModal" ng-click="findById(entity.id)" >修改</button></td>

//ng-click="save()"，根据请求地址判断调用save

<button class="btn btn-success" data-dismiss="modal" aria-hidden="true" ng-click="save()">保存</button>