根据表名动态获取数据
查询接口
@ApiOperation("通用高级搜索")
@PostMapping("/highSearch")
public ResponseResult highSearch(@RequestBody HighSearchVO highSearchVO) {
return dynamicDataRetrievalService.highSearch(highSearchVO);
}Service
@Override
@Transactional
public ResponseResult highSearch(HighSearchVO highSearchVO) {
// 检索
highSearchVO.setPageNo((highSearchVO.getPageNo() - 1) * highSearchVO.getPageSize());
for (HighSearch highSearch : highSearchVO.getHighSearches()) {
if ("datetime".equals(highSearch.getColumnType())) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String[] times = highSearch.getSearchValue().split("\\|");
try {
highSearch.setStartDate(sdf.parse(times[0]));
highSearch.setEndDate(sdf.parse(times[1]));
} catch (ParseException e) {
e.printStackTrace();
return ResponseResult.fail("时间格式不正确");
}
}
}
List> maps = dynamicDataRetrievalMapper.highSearch(highSearchVO); 由于是动态的，不能确定返回的List<>中填写哪个实体类型，所以可以用List
list: [
{
"task_name": "落盘任务test1",
"center_freq": "9600MHz",
"file_location": "/files/2022_05_22_10_38_29_281_I_9600MHz_43803",
"pdw_format_id": 1,
"file_name": "2022_05_22_10_38_29_281_I_9600MHz_43803",
"fileSuffix": [
".dat",
".pls"
],
"target_id": 3,
"file_size": 9.2980568E7,
"gather_time": "2022-05-22T10:38:29.281",
"in_time": "2023-11-15T16:04:37",
"pulse_num": 43803,
"gather_id": 2,
"id": 46,
"system_model_id": 1
},
{
"task_name": "落盘任务test1",
"center_freq": "9600MHz",
"file_location": "/files/2022_05_22_10_38_29_281_I_9600MHz_43803",
"pdw_format_id": 1,
"file_name": "2022_05_22_10_38_29_281_I_9600MHz_43803",
"fileSuffix": [
".dat",
".pls"
],
"target_id": 3,
"file_size": 9.2980568E7,
"gather_time": "2022-05-22T10:38:29.281",
"in_time": "2023-11-15T16:04:37",
"pulse_num": 43803,
"gather_id": 2,
"id": 46,
"system_model_id": 1
}
]HighSearchVO
@ApiModel(description = "高级搜索前端传参")
@Data
public class HighSearchVO {
@ApiModelProperty("表名")
private String tableName;
@ApiModelProperty("搜索字段集合")
private List highSearches;
@ApiModelProperty("排序字段")
private String orderColumn;
@ApiModelProperty("排序控制(asc,desc)")
private String orderControl;
@ApiModelProperty("页数")
private Integer pageSize;
@ApiModelProperty("页码")
private Integer pageNo;
} HighSearch
@ApiModel(description = "HIGH_SEARCH实体对象")
@Data
public class HighSearch {
@ApiModelProperty(value = "字段名")
private String columnName;
@ApiModelProperty(value = "字段搜索值")
private String searchValue;
@ApiModelProperty(value = "字段类型")
private String columnType;
@ApiModelProperty(value = "开始时间（如果根据时间查询）")
private Date startDate;
@ApiModelProperty(value = "结束时间（如果根据时间查询）")
private Date endDate;
}动态sql：
请求参数：
{
"tableName": "file_meta_data",
"orderColumn": "id",
"orderControl": "desc",
"pageNo": 1,
"pageSize": 10,
"highSearches": [
{
"columnName": "id",
"searchValue": 21,
"columnType": "bigint"
},
{
"columnName": "name",
"searchValue": "小明",
"columnType": "varchar"
}
]
}动态下载导出数据excel
使用到阿里的easy-excel
@GetMapping("download")
public void download(HttpServletResponse response) throws IOException {
// 这里注意 有同学反应使用swagger 会导致各种问题，请直接用浏览器或者用postman
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setCharacterEncoding("utf-8");
// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
String fileName = URLEncoder.encode("测试", "UTF-8").replaceAll("\\+", "%20");
response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
EasyExcel.write(response.getOutputStream(), DownloadData.class).sheet("模板").doWrite(data());
}
private List data() {
List list = ListUtils.newArrayList();
for (int i = 0; i < 10; i++) {
DownloadData data = new DownloadData();
data.setString("字符串" + 0);
data.setDate(new Date());
data.setDoubleData(0.56);
list.add(data);
}
return list;
} 上面那个是定死的下载哪个实体对应的数据，而我们现在要求动态，动态获取数据list已经搞定了，但是数据List
问题二解决：
/**
* 表对象枚举
*/
public enum TableObjectEnum {
file_meta_data(FileMetaData.class),
radar_sort_pwd(RadarSortPwd.class),
;
private Class aClass;
TableObjectEnum(Class aClass) {
this.aClass = aClass;
}
public Class getaClass() {
return aClass;
}
public void setaClass(Class aClass) {
this.aClass = aClass;
}
// 根据表名获取对应的 Class（.class运行时类）
public static Class getClassForTableName(String tableName) throws ClassNotFoundException {
for (TableObjectEnum tableObjectEnum : TableObjectEnum.values()) {
if (tableObjectEnum.name().equalsIgnoreCase(tableName)) {
return tableObjectEnum.getaClass();
}
}
throw new ClassNotFoundException("表名没找到对应的类" + tableName);
}
}问题一解决：
/**
* 将数据转化为导出可以支持的数据
*
* @param dataList
*/
private List convertData(List> dataList, Class objectType) {
List objectList = new ArrayList<>();
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.registerModule(new JavaTimeModule()); // 注册 Java 8 日期/时间模块
try {
// 遍历 dataList 并将每个 Map 转换为对象，添加到列表中
for (Map data : dataList) {
T object = objectMapper.convertValue(data, objectType);
objectList.add(object);
}
} catch (Exception e) {
e.printStackTrace();
}
return objectList;
} 完整代码
@Override
public void download(HttpServletResponse response, HighSearchVO highSearchVO) throws UnsupportedEncodingException {
String tableName = highSearchVO.getTableName();
// 这里注意 有同学反应使用swagger 会导致各种问题，请直接用浏览器或者用postman
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setCharacterEncoding("utf-8");
// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
String fileName = URLEncoder.encode("测试", "UTF-8").replaceAll("\\+", "%20");
response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
try {
Class classForTableName = TableObjectEnum.getClassForTableName(tableName);
// 查询数据
List> dataList = getData(highSearchVO);
List list = convertData(dataList, classForTableName);
// 忽略字段
Set excludeColumnFiledNames = new HashSet();
// excludeColumnFiledNames.add("pdwId");
EasyExcel.write(response.getOutputStream(), classForTableName)
.excludeColumnFieldNames(excludeColumnFiledNames)
// .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()) // 自动列宽
.sheet("模板").doWrite(list);
} catch (ClassNotFoundException | IOException e) {
e.printStackTrace();
}
}