大坑
今日开发中遇到一个问题，使用ExcelUtils导入excel，excel中有一列为金额字段，有负数 ，例如-2.94，发现在导入后被自动转换为了-3.00，只有负数会这样
负数会进行以下操作
(new DecimalFormat("0")).format(o)
解决方案：
1.手写ExcelUtils
java
package com.chinaums.common.utils.sql;
import com.chinaums.common.annotation.Excel;
import com.chinaums.tools.DateUtils;
import com.chinaums.tools.StringUtils;
import com.chinaums.tools.converter.Convert;
import com.chinaums.tools.reflect.ReflectUtils;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.ss.formula.functions.T;
import org.apache.poi.ss.usermodel.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.*;
import static com.chinaums.tools.poi.ExcelUtils.reverseByExp;
/**
* Bean 工具类
*/
public class ExcelUtils<T> {
private static final Logger log = LoggerFactory.getLogger(com.chinaums.tools.poi.ExcelUtils.class);
public static final int sheetSize = 65536;
private String sheetName;
private Excel.Type type;
private Workbook wb;
private Sheet sheet;
private List<T> list;
private List<Object[]> fields;
public final Class<T> clazz;
public ExcelUtils(Class<T> clazz) {
this.clazz = clazz;
}
public List<T> importExcel(String sheetName, InputStream is) throws Exception {
this.type = Excel.Type.IMPORT;
this.wb = WorkbookFactory.create(is);
List<T> list = new ArrayList();
Sheet sheet;
if (StringUtils.isNotEmpty(sheetName)) {
sheet = this.wb.getSheet(sheetName);
} else {
sheet = this.wb.getSheetAt(0);
}
if (sheet == null) {
throw new IOException("文件sheet不存在");
} else {
int rows = sheet.getPhysicalNumberOfRows();
if (rows > 0) {
Map<String, Integer> cellMap = new HashMap();
Row heard = sheet.getRow(0);
for (int i = 0; i < heard.getPhysicalNumberOfCells(); ++i) {
String value = this.getCellValue(heard, i).toString();
cellMap.put(value, i);
}
Field[] allFields = this.clazz.getDeclaredFields();
Map<Integer, Field> fieldsMap = new HashMap();
Field[] var10 = allFields;
int var11 = allFields.length;
for (int var12 = 0; var12 < var11; ++var12) {
Field field = var10[var12];
Excel attr = (Excel) field.getAnnotation(Excel.class);
if (attr != null && (attr.type() == Excel.Type.ALL || attr.type() == this.type)) {
field.setAccessible(true);
Integer column = (Integer) cellMap.get(attr.name());
fieldsMap.put(column, field);
}
}
for (int i = 1; i < rows; ++i) {
Row row = sheet.getRow(i);
T entity = null;
Iterator var25 = fieldsMap.entrySet().iterator();
while (var25.hasNext()) {
Map.Entry<Integer, Field> entry = (Map.Entry) var25.next();
Object val = this.getCellValue(row, (Integer) entry.getKey());
entity = entity == null ? this.clazz.newInstance() : entity;
Field field = (Field) fieldsMap.get(entry.getKey());
Class<?> fieldType = field.getType();
if (String.class == fieldType) {
String s = Convert.toStr(val);
if (StringUtils.endsWith(s, ".0")) {
val = StringUtils.substringBefore(s, ".0");
} else {
val = Convert.toStr(val);
}
} else if (Integer.TYPE != fieldType && Integer.class != fieldType) {
if (Long.TYPE != fieldType && Long.class != fieldType) {
if (Double.TYPE != fieldType && Double.class != fieldType) {
if (Float.TYPE != fieldType && Float.class != fieldType) {
if (BigDecimal.class == fieldType) {
val = Convert.toBigDecimal(val);
} else if (Date.class == fieldType) {
if (val instanceof String) {
val = DateUtils.parseDate(val);
} else if (val instanceof Double) {
val = DateUtil.getJavaDate((Double) val);
}
}
} else {
val = Convert.toFloat(val);
}
} else {
val = Convert.toDouble(val);
}
} else {
val = Convert.toLong(val);
}
} else {
val = Convert.toInt(val);
}
if (StringUtils.isNotNull(fieldType)) {
Excel attr = (Excel) field.getAnnotation(Excel.class);
String propertyName = field.getName();
if (StringUtils.isNotEmpty(attr.targetAttr())) {
propertyName = field.getName() + "." + attr.targetAttr();
} else if (StringUtils.isNotEmpty(attr.readConverterExp())) {
val = reverseByExp(String.valueOf(val), attr.readConverterExp());
}
ReflectUtils.invokeSetter(entity, propertyName, val);
}
}
list.add(entity);
}
}
return list;
}
}
public Object getCellValue(Row row, int column) {
if (row == null) {
return null;
} else {
Object val = "";
try {
Cell cell = row.getCell(column);
if (cell != null) {
if (cell.getCellTypeEnum() != CellType.NUMERIC && cell.getCellTypeEnum() != CellType.FORMULA) {
if (cell.getCellTypeEnum() == CellType.STRING) {
val = cell.getStringCellValue();
} else if (cell.getCellTypeEnum() == CellType.BOOLEAN) {
val = cell.getBooleanCellValue();
} else if (cell.getCellTypeEnum() == CellType.ERROR) {
val = cell.getErrorCellValue();
}
} else {
val = cell.getNumericCellValue();
if (HSSFDateUtil.isCellDateFormatted(cell)) {
val = DateUtil.getJavaDate((Double) val);
} else if ((Double) val % 1.0 > 0.0) {
val = (new DecimalFormat("0.00")).format(val);
}
}
}
return val;
} catch (Exception var5) {
return val;
}
}
}
}2.优化getCellValue方法 使其不对负数金额进行处理，原样返回
3.最后附上 导入excel代码
java
public R elmImport(MultipartFile multipartFile) {
//1、文件上传
fileInfoService.uploadFile(1, 1, null, "", userId, Constants.OTHERS, multipartFile);
//2、excel文件读取
ExcelUtils<ElmImportVo> excelUtils = new ExcelUtils<>(ElmImportVo.class);
//待存储数量
List<RealTransInfoEntity> waitSaveList = new ArrayList<>();
List<ElmImportVo> elmList;
//3、读取校验excel信息
try {
elmList = excelUtils.importExcel("账单明细", multipartFile.getInputStream());
} catch (Exception e) {
e.printStackTrace();
throw new ServiceException("--------导入失败---------");
}
}