我们在用poi导入时导入的Excel列的字段类型经常和实体类里的不一致
//导入类
public class ImportVo {
@ExcelVOAttribute(name = "名称",column="A")
private String mc;
@ExcelVOAttribute(name = "数量",column="B")
private Integer sl;
@ExcelVOAttribute(name = "单价",column="C")
private Double dj;
@ExcelVOAttribute(name = "金额",column="D")
private Double je;
public String getMc() {
return mc;
}
public void setMc(String mc) {
this.mc = mc;
}
public Integer getSl() {
return sl;
}
public void setSl(Integer sl) {
this.sl = sl;
}
public Double getDj() {
return dj;
}
public void setDj(Double dj) {
this.dj = dj;
}
public Double getJe() {
return je;
}
public void setJe(Double je) {
this.je = je;
}
@Override
public String toString() {
return "ImportVo{" +
"mc='" + mc + '\'' +
", sl=" + sl +
", dj=" + dj +
", je=" + je +
'}';
}
}
public void importcs(HttpServletRequest request) throws Exception {
MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
Iterator<String> files = mRequest.getFileNames();
//只取第一个EXCEL文件，只取第一个sheel
if (files.hasNext()) {
MultipartFile multipartFile = mRequest.getFile(files.next());
MyExcelUtils<ImportVo> myExcelUtils = new MyExcelUtils(multipartFile, ImportVo.class);
List<ImportVo> list = myExcelUtils.importExcel(3);
list.forEach(System.out::println);
}
}
MultipartFile 工具类
public class MyExcelUtils<T>{
HSSFWorkbook workbook=null;// 工作薄对象
HSSFSheet sheet=null;// 工作表对象
ServletOutputStream output=null;//输出流
HSSFRow row=null;//行
HSSFCell cell=null;//单元格
CellStyle style =null;//单元格样式
String path;//文件路径
InputStream input;//输入流
MultipartFile file;//上传的文件
Class<T> clazz;
public MyExcelUtils() {
super();
}
/*导出时候用的到*/
public MyExcelUtils(Class<T> clazz) {
super();
this.clazz = clazz;
}
/*导出入时候用的到*/
public MyExcelUtils(MultipartFile file, Class<T> clazz) throws Exception {
super();
input = file.getInputStream();
this.clazz = clazz;
}
/** *导入数据* *//***/
public List<T> importExcel(Integer beginRowIndex){
String sheetName="";
beginRowIndex=beginRowIndex==null?1:beginRowIndex;
return importExcel( sheetName, beginRowIndex);
}
public List<T> importExcel(String sheetName,Integer beginRowIndex) {
int maxCol = 0;
List<T> list = new ArrayList<T>();
try {
HSSFWorkbook workbook = new HSSFWorkbook(input);
HSSFSheet sheet = workbook.getSheet(sheetName);
if (!sheetName.trim().equals("")) {
sheet = workbook.getSheet(sheetName);// 如果指定sheet名,则取指定sheet中的内容.
}
if (sheet == null) {
sheet = workbook.getSheetAt(0); // 如果传入的sheet名不存在则默认指向第1个sheet.
}
int rows = sheet.getPhysicalNumberOfRows();
if (rows > 0) {// 有数据时才处理
// Field[] allFields = clazz.getDeclaredFields();// 得到类的所有field.
List<Field> allFields = ExcelFragment.fltMappedFileds(ExcelFragment.getMappedFiled(clazz, null),2);
Map<Integer, Field> fieldsMap = new HashMap<Integer, Field>();// 定义一个map用于存放列的序号和field.
for (Field field : allFields) {
// 将有注解的field存放到map中.
if (field.isAnnotationPresent(ExcelVOAttribute.class)) {
ExcelVOAttribute attr = field .getAnnotation(ExcelVOAttribute.class);
int col = ExcelFragment.getExcelCol(attr.column());// 获得列号
maxCol = Math.max(col, maxCol);
field.setAccessible(true);// 设置类的私有字段属性可访问.
fieldsMap.put(col, field);
}
}
for (int i = beginRowIndex; i < rows; i++) {// 从第4行开始取数据,默认第3行是表头.
HSSFRow row = sheet.getRow(i);
if(row==null) {
continue;
}
int cellNum = maxCol+1;
T entity = null;
for (int j = 0; j < cellNum; j++) {
HSSFCell cell = row.getCell(j);
Object cellval=null;
if (cell == null){
continue;
}
Field field = fieldsMap.get(j);// 从map中得到对应列的field.
if (field==null) {
continue;
}
entity = (entity == null ? clazz.newInstance() : entity);// 如果不存在实例则新建.
Class<?> fieldType = field.getType();
if (String.class == fieldType) {
cell.setCellType(Cell.CELL_TYPE_STRING);
cellval= cell.getStringCellValue();
field.set(entity, String.valueOf(cellval==null?"":cellval));
} else if ((Integer.TYPE == fieldType) || (Integer.class == fieldType)) {
cellval=cell.getNumericCellValue();
field.set(entity, Double.valueOf((cellval==null?0.0:cellval).toString()).intValue());
} else if ((Long.TYPE == fieldType) || (Long.class == fieldType)) {
cellval=cell.getNumericCellValue();
field.set(entity, Long.valueOf( cellval.toString()));
} else if ((Float.TYPE == fieldType) || (Float.class == fieldType)) {
cellval=cell.getNumericCellValue();
field.set(entity, Float.valueOf(cellval.toString()));
} else if ((Short.TYPE == fieldType) || (Short.class == fieldType)) {
cellval=cell.getNumericCellValue();
field.set(entity, Short.valueOf(cellval.toString()));
} else if ((Double.TYPE == fieldType) || (Double.class == fieldType)) {
cellval=cell.getNumericCellValue();
field.set(entity, Double.valueOf((cellval==null?0.0:cellval).toString()));
} else if (Character.TYPE == fieldType) {
cell.setCellType(Cell.CELL_TYPE_STRING);
cellval= cell.getStringCellValue();
String c=(String) cellval;
if ((c != null) && (c.length() > 0)){
field.set(entity, Character .valueOf(c.charAt(0)));
}
}
// 取得类型,并根据对象类型设置值.
}
if (entity != null) {
list.add(entity);
}
}
}
} catch (IOException e) {
e.printStackTrace();
log.error("EXCEL 导入失败:IO异常"+e.getMessage());
} catch (InstantiationException e) {
e.printStackTrace();
log.error("EXCEL 导入失败:InstantiationException异常"+e.getMessage());
} catch (IllegalAccessException e) {
e.printStackTrace();
log.error("EXCEL 导入失败:IllegalAccessException异常"+e.getMessage());
} catch (IllegalArgumentException e) {
e.printStackTrace();
log.error("EXCEL 导入失败:IllegalArgumentException异常"+e.getMessage());
} catch( Exception e){
e.printStackTrace();
log.error("EXCEL 导入失败:其他异常"+e.getMessage());
}
return list;
}
}
那我们可以新建一个导入的实体类全部设置成String类型的
//新的导入类
public class ImportCs {
@ExcelVOAttribute(name = "名称",column="A")
private String mc;
@ExcelVOAttribute(name = "数量",column="B")
private String sl;
@ExcelVOAttribute(name = "单价",column="C")
private String dj;
@ExcelVOAttribute(name = "金额",column="D")
private String je;
public String getMc() {
return mc;
}
public void setMc(String mc) {
this.mc = mc;
}
public String getSl() {
return sl;
}
public void setSl(String sl) {
this.sl = sl;
}
public String getDj() {
return dj;
}
public void setDj(String dj) {
this.dj = dj;
}
public String getJe() {
return je;
}
public void setJe(String je) {
this.je = je;
}
}
再次导入就可以
