# 导入导出
操作Excel目前比较流行的就是Apache POI和阿里巴巴的easyExcel
# 介绍
# 导入jar
- poi提供microsoft office旧版本支持,eg,xls,Excel(2003-2007的版本)
- poi-ooxml提供microsoft office新版本支持,eg,xlsx Excel(2007以后的版本)
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.1.2</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.1.2</version>
</dependency>
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# 写excel
public class TestExcel {
public static void main(String[] args) throws IOException, IllegalAccessException {
ArrayList<User> dataList = new ArrayList<>();
for (int i = 0; i < 1000; i++) {
dataList.add(new User(i, "warren" + i));
}
doExportOneThread(dataList);
}
public static void doExportOneThread(ArrayList<User> dataList) throws IOException, IllegalAccessException {
//创建一个工作蒲
SXSSFWorkbook workbook = new SXSSFWorkbook();
//创建一个sheet页
SXSSFSheet sheet = workbook.createSheet();
sheet.setRandomAccessWindowSize(-1);
Iterator<User> iterator = dataList.iterator();
//通过反射去拿到属性
Field[] fields = User.class.getDeclaredFields();
Integer currentRow = 0;
while (iterator.hasNext()) {
User user = iterator.next();
SXSSFRow row = sheet.createRow(currentRow);
//属性值去导出
for (int i = 0; i < fields.length; i++) {
SXSSFCell cell = row.createCell(i);
if (currentRow == 0) {
cell.setCellValue(fields[i].getName());
} else {
cell.setCellValue(String.valueOf(fields[i].get(user)));
}
}
currentRow++;
}
FileOutputStream fileOutputStream = new FileOutputStream(new File("/Users/WWei15/Documents/workspace/learn/hello-world/1.xlsx"));
workbook.write(fileOutputStream);
}
}
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# 读excel
public class TestReadPOI {
public static void main(String[] args) throws IOException {
FileInputStream fis = new FileInputStream("/Users/WWei15/Documents/workspace/learn/hello-world/1.xlsx");
Workbook workbook = new XSSFWorkbook(fis);
Sheet sheet = workbook.getSheetAt(0);
int firstRow = 0;
int lastRow = sheet.getLastRowNum();
for (int i = firstRow; i <= lastRow; i++) {
Row row = sheet.getRow(i);
int lastCol = row.getLastCellNum();
for (int j = 0; j < lastCol; j++) {
Cell cell = row.getCell(j);
String value = cell.getStringCellValue();
System.out.print(value + "");
}
System.out.println();
}
}
}
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# 相关资料
Apache POI 官网 (opens new window)
POI和easyExcel (opens new window)
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