接口调用外部系统返回数据，本系统做数据分页封装

Posted 2021-02-06 misterzhaoyan

场景：

　　本系统用的Mybatis分页插件PageHelper，调用了外部系统返回的数据为String类型的JSON串，数据量毕竟多，界面需要分页展示。

解决思路：

      返回数据转List,然后把多个List放到一个List里，然后在从这个List里进行分页,前端只需要传一个页码过来即可，

部分代码如下：

Service代码

ResponseMsg<AppResp> responseMsg = new ResponseMsg<>();

int currentPage = req.getCurrentPage();
int pageSize = req.getPageSize();

String str= "[{"id":1546051323216,"name":"TPCE测试流程"},{"id":1546051343822,"name":"TPC-DS测试流程"}]";//例子

List list = JSONArray.parseArray( str );

List<Object> objects = new ArrayList<>();
int num = (currentPage > 1 ? (currentPage - 1) * pageSize : 0);
assert list != null;
for (int i = 0; i < pageSize && i < list.size() - num; i++) {
    objects.add( list.get( num + i ) );
}

AppResp appResp = new AppResp();
appResp.setList( objects );
responseMsg.setResult( appResp );
responseMsg.setCurrentPage( currentPage );
responseMsg.setTotal( list.size() );

js代码:

$scope.list = [];
$scope.currentPage = 1;
$scope.pageSize = 10;
$scope.getProcessList = function () {
    PARAM_BODY.currentPage = $scope.currentPage;
    PARAM_BODY.pageSize = $scope.pageSize;
    $http({
        method: ‘POST‘,
        url: options.app_api + ‘/app/getProcessList‘,
        data: JSON.stringify(PARAM_BODY)
    }).success(function (data) {
        $scope.list = data.result.list;
        $scope.currentPage = data.currentPage;
        $scope.total = data.total;
    });
};