版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/yanwenwennihao/article/details/84777305
导入后端逻辑
导入需要下载模板,目的是导入表格规范
Controller层
/**
* 下载上课班信息模板，批量导入使用
*
* @param response
* @return
* @author 严文文
* @since 2.0.0 2018-11-25 16:51:36
*/
@ApiOperation(value = "下载上课班信息模板，批量导入使用", notes = "下载上课班信息模板，批量导入使用")
@GetMapping(value = {"/downLoadTeachClassTemplate"})
public ItooResult downLoadTeachClassTemplate(HttpServletResponse response) {
if (teachClassService.downLoadTeachClassTemplate(response)) {
return ItooResult.build(ItooResult.SUCCESS, "下载上课班信息模板成功");
} else {
return ItooResult.build(ItooResult.FAIL, "下载上课班信息模板失败");
}
}Web服务器收到客户端的http请求，会针对每一次请求，分别创建一个用于代表请求的request对象、和代表响应的response对象。
request和response对象即然代表请求和响应，那我们要获取客户机提交过来的数据，只需要找request对象就行了。要向客户机输出数据，只需要找response对象就行了。
Servicelmpl层
@Override
public boolean downLoadTeachClassTemplate(HttpServletResponse response){
Map<Serializable, Serializable> map = new HashMap<>(16);
List<TeachClassExportTemplate> templateList = new ArrayList<>();
TeachClassExportTemplate teachClassExportTemplate = new TeachClassExportTemplate();
//添加下载模板范例
teachClassExportTemplate.setCode("388539");
teachClassExportTemplate.setName("中国近代历史人物评说1班");
teachClassExportTemplate.setSchoolYear("2017-2018学年第二学期");
teachClassExportTemplate.setCapacity("99");
templateList.add(teachClassExportTemplate);
//sheet的名字
map.put(SHEET_NAME, "上课班信息");
//需要导入的字段
map.put(COLUMNS, new String[]{"code","name","schoolYear","capacity"});
//表格的标题
map.put(TITLE, "上课班信息");
map.put(NAME, "上课班信息模板");
map.put(DATA_LIST, (Serializable) templateList);
try {
ExcelUtil.exportExcel(map, response);
return true;
} catch (Exception e) {
return false;
}
}JAVA中Map和HashMap
1、首先Map是一个接口，HashMap实现了Map接口的类;HashMap是类，Map是接口
2、Map是存储键和值这样的双列数据集合，但存储的数据是没有顺序的，其键不能重复，但其值是可以重复的，可以通过每一个键找到每一个对应的值;HashMap线程不同步的，即线程不安全的，但只有一个线程访问时效率较高;
3、Map是接口，HashMap是接口Map的实现类，体现了面向接口编程
4、HashMap实现了接口Map,就是说HashMap实现了Map所有的方法。
深入分析HashMap:https://blog.csdn.net/lianhuazy167/article/details/66967698
导入过程
/**
* 批量导入上课班信息
* @param multipartFile
* @param request
* @param response
* @return
* @author 严文文
* @since 2.0.0 2018-11-25 16:51:36
*/
@Override
public ItooResult importTeachClassByTemplate(MultipartFile multipartFile, HttpServletRequest request, HttpServletResponse response){
response.setContentType("UTF-8");
try {
//校验文件是否存在
String fileName = multipartFile.getOriginalFilename();
if (fileName == null) {
log.error("导入失败,fileName is null!");
return ItooResult.build(ItooResult.FAIL, "传入的文件为空！");
}
//EXCEL解析成List
Map<Serializable, Serializable> map = new HashMap<>(4);
map.put(SHEET_NAME, "上课班信息");
map.put(CLASS, TeachClassExportTemplate.class);
List<TeachClassExportTemplate> teachClassExportTemplateList = ExcelUtil.importExcel(Objects.requireNonNull(fileName), map, request, response);
if (teachClassExportTemplateList.size() == 0) {
return ItooResult.build(ItooResult.FAIL, "导入的数据为空，请填写！");
}
//定义导入的错误数据集合并存redis中形式的<String,TeachClassExportTemplate>
List<TeachClassExportTemplate> errorTPTList = new ArrayList<>();
String errorTPTListId = IdWorker.getIdStr();
Long size = redisTemplate.opsForZSet().size(errorTPTListId);
size = size == null ? 0L : size;
for (TeachClassExportTemplate excelTPT : teachClassExportTemplateList) {
if (!this.verify(excelTPT)) {
TeachClassExportTemplate teachClassExportTemplate = new TeachClassExportTemplate();
BeanUtils.copyProperties(excelTPT, teachClassExportTemplate);
errorTPTList.add(teachClassExportTemplate);
redisTemplate.opsForZSet().add(errorTPTListId, teachClassExportTemplate, size + 1);
continue;
}
TeachClassEntity teachClassEntity=insertValue(excelTPT);
this.save(teachClassEntity);
}
//不符合条件的信息返回
if (errorTPTList.size() > 0) {
return ItooResult.build("0001","部分导入失败",errorTPTListId);
}
}
catch(Exception e)
{
return ItooResult.build(ItooResult.FAIL, "导入数据异常！",e);
}
return ItooResult.build(ItooResult.SUCCESS, "导入数据成功！");
}
/**
* 将模板的值插入实体中-导入专用
*
* @param teachClassExportTemplate
* @return 严文文
* @since 2.0.0 2018-12-2 16:49:41
*/
private TeachClassEntity insertValue(TeachClassExportTemplate teachClassExportTemplate){
TeachClassEntity teachClassEntity = new TeachClassEntity();
//将导入内容放到entity中对应的属性中去
BeanUtils.copyProperties(teachClassExportTemplate, teachClassEntity);
//上课班ID
teachClassEntity.setId(IdWorker.getIdStr());
//可用
teachClassEntity.setIsDelete(0);
//上课班名称
teachClassEntity.setName(teachClassExportTemplate.getName());
teachClassEntity.setSchoolYear(teachClassExportTemplate.getSchoolYear());
teachClassEntity.setCapacity(Integer.parseInt(teachClassExportTemplate.getCapacity()));
//上课班代码
teachClassEntity.setCode(teachClassExportTemplate.getCode());
//选填数据
//操作者
teachClassEntity.setOperator("大米时代");
return teachClassEntity;
}
/**
* 判断导入的信息是否为空
*
* @param excelTPT 需要导入的信息
* @return boolean 导入的字段是否为空
* @author 严文文
* @since 2.0.0 2018-11-25 17:41:30
*/
private boolean verify(TeachClassExportTemplate excelTPT )
{
if (StringUtils.isEmpty(excelTPT.getCode())) {
excelTPT.setFailReason("上课班代码未填写");
log.warn("导入失败,上课班代码未填写,excelFooEntity-{}", excelTPT);
return false;
}
if (StringUtils.isEmpty(excelTPT.getName())) {
excelTPT.setFailReason("上课班名称未填写");
log.warn("导入失败,上课班名称未填写,excelFooEntity-{}", excelTPT);
return false;
}
if (StringUtils.isEmpty(excelTPT.getCapacity())) {
excelTPT.setFailReason("上课班容量未填写");
log.warn("导入失败,上课班容量未填写,excelFooEntity-{}", excelTPT);
return false;
}
if (StringUtils.isEmpty(excelTPT.getSchoolYear())) {
excelTPT.setFailReason("学期学年未填写");
log.warn("导入失败,学期学年未填写,excelFooEntity-{}", excelTPT);
return false;
}
//通过上课班code查询上课班信息
List<TeachClassModel> teachClassModel = teachClassService.findteachClassByCode(excelTPT.getCode());
//判断是否存在该上课班code，存在记录下错误原因
if (!CollectionUtils.isEmpty(teachClassModel)) {
excelTPT.setFailReason("已存在该上课班code");
log.warn("已存在上课班Code-",excelTPT.getCode());
return false;
}
TeachClassEntity teachClassEntity = new TeachClassEntity();
//将导入内容放到entity中对应的属性中去
BeanUtils.copyProperties(excelTPT, teachClassEntity);
//不存在即将专业code存入
teachClassEntity.setCode(excelTPT.getCode());
teachClassEntity.setName(excelTPT.getName());
teachClassEntity.setSchoolYear(excelTPT.getSchoolYear());
teachClassEntity.setCapacity(Integer.parseInt(excelTPT.getCapacity()));
return true;
}
response.setContentType("UTF-8"); 防止中文乱码
技术点:一条一条导入表格数据,并且把错误数据导出,显示错误原因
代码思路:1 校验文件是否存在 2 excel解析成List 3 定义导入错误数据集合并存redis中形式 4显示结果
导出全部信息思路
Controller
/**
* 根据ID导出上课班信息
*
* @param response
* @param idList
* @return
* @author 严文文
* @since 2.0.0 2018-11-25 16:51:36
*/
@ApiOperation(value = "根据ID导出上课班信息")
@GetMapping(value = {"/exportAllByIds"})
public ItooResult exportAllByIds(HttpServletResponse response,@RequestParam(required = false,defaultValue = "") List<String> idList) {
return teachClassService.exportAllByIds(response, idList);
}ServiceImpl层
@Override
public ItooResult exportAllByIds(HttpServletResponse response, List<String> idList){
Map<Serializable, Serializable> map = new HashMap<>(16);
//sheet的名字
map.put(SHEET_NAME, "上课班信息");
//需要导入的字段
map.put(COLUMNS, new String[]{"code","name","schoolYear","capacity"});
//表格的标题
map.put(TITLE, "上课班信息");
map.put(NAME, "上课班信息模板");
//要导出的数据
List<TeachClassExportTemplate> teachClassExportTemplateList = new ArrayList<>();
List<TeachClassModel> teachClassModelList = teachClassService.queryTeachClassInfoByIds(idList);
for (TeachClassModel teachClassModel : teachClassModelList) {
TeachClassExportTemplate teachClassExportTemplate = new TeachClassExportTemplate();
BeanUtils.copyProperties(teachClassModel, teachClassExportTemplate);
teachClassExportTemplate.setCapacity(String.valueOf(teachClassModel.getCapacity()));
teachClassExportTemplateList.add(teachClassExportTemplate);
}
//为空不进行导出
if (teachClassExportTemplateList.size() == 0) {
return ItooResult.build(ItooResult.FAIL, "没有要导出的数据！");
}
map.put(DATA_LIST, (Serializable) teachClassExportTemplateList);
//导出
try {
ExcelUtil.exportExcel(map, response);
} catch (Exception e) {
log.error("导出失败,未知的异常--" + e);
return ItooResult.build(ItooResult.FAIL, "导出信息失败！",e);
}
return ItooResult.build(ItooResult.SUCCESS, "导出信息成功！");
}