java导入execl日期格式,row.getCell(8)是日期格式yyyy-MM-dd, 判断是否为yyyy-MM-dd格式的,并且放入到Date date中
时间: 2024-09-20 10:15:48 浏览: 55
在Java中,如果你需要将Excel文件中的日期字符串(例如"yyyy-MM-dd"格式)读取并转换为`java.util.Date`对象,你可以使用Apache POI库,它提供了一个叫做`HSSFCell`的方法来处理Excel单元格内容。首先,你需要确定日期字符串是否符合指定格式,然后通过`SimpleDateFormat`将其转换。
以下是一个示例步骤:
1. 添加Apache POI依赖(如果你还没有的话):
```xml
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.1.2</version>
</dependency>
```
2. 使用`SimpleDateFormat`判断并转换日期:
```java
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.File;
import java.io.FileInputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
public class ExcelDateReader {
private static final String DATE_FORMAT = "yyyy-MM-dd";
public static void main(String[] args) throws Exception {
FileInputStream file = new FileInputStream(new File("your_excel_file.xlsx"));
Workbook workbook = new XSSFWorkbook(file);
try (Sheet sheet = workbook.getSheetAt(0)) {
for (Row row : sheet) {
if (row.getCell(8) != null) {
String cellValue = row.getCell(8).getStringCellValue();
// 检查日期格式
SimpleDateFormat format = new SimpleDateFormat(DATE_FORMAT);
boolean isValidFormat = format.matches(cellValue);
if (isValidFormat) {
try {
Date date = format.parse(cellValue);
System.out.println("Converted date: " + date);
} catch (ParseException e) {
System.err.println("Invalid date format in cell: " + cellValue);
}
} else {
System.out.println("Cell at position 8 is not in the yyyy-MM-dd format: " + cellValue);
}
}
}
} finally {
workbook.close();
file.close();
}
}
}
```
在这个例子中,我们首先检查cell值是否为空,如果非空,使用正则表达式检查其是否匹配`yyyy-MM-dd`的格式。如果匹配,我们就尝试使用`SimpleDateFormat`解析这个字符串;如果不匹配,则打印错误消息。
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