Java implements excel import data tool class
- 2020-04-01 03:10:16
- OfStack
Import Excel data tool class, call also a few lines of code, very simple.
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import org.apache.commons.beanutils.BeanUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.io.InputStream;
import java.util.*;
public class ExcelUtils {
private static final Logger logger = LoggerFactory.getLogger(ExcelUtils.class);
//successful
public static final Integer STATUS_OK = Integer.valueOf(1);
//failure
public static final Integer STATUS_NO = Integer.valueOf(0);
private ExcelUtils(){
}
public static List<Map<String, String>> getImportData(InputStream is, List<String> excelColumnNames) throws Exception {
logger.debug("InputStream:{}", is);
if (is == null) {
return Collections.emptyList();
}
Workbook workbook = null;
try {
//To get the excel
workbook = Workbook.getWorkbook(is);
} catch (BiffException e) {
logger.error(e.getMessage(), e);
return Collections.EMPTY_LIST;
} catch (IOException e) {
logger.error(e.getMessage(), e);
return Collections.EMPTY_LIST;
}
logger.debug("workbook:{}", workbook);
if (workbook == null) {
return Collections.emptyList();
}
//The first sheet
Sheet sheet = workbook.getSheet(0);
//The number of rows
int rowCounts = sheet.getRows() - 1;
logger.debug("rowCounts:{}", rowCounts);
List<Map<String, String>> list = new ArrayList<Map<String, String>>(rowCounts - 1);
//The double for loop fetches the data
for(int i = 1; i < rowCounts; i++){
Map<String, String> params = new HashMap<String, String>();
//I,j I: row j: column
for(int j = 0; j < excelColumnNames.size(); j++){
Cell cell = sheet.getCell(j, i);
params.put(excelColumnNames.get(j), cell.getContents());
}
list.add(params);
}
return list;
}
public static <T> List<T> makeData(List<Map<String, String>> data, Class<T> clazz, List<String> excelColumnNames, CheckExcel checkExcel) throws Exception {
if(data == null || data.isEmpty() || clazz == null || checkExcel == null) {
return Collections.EMPTY_LIST;
}
List<T> result = new ArrayList<T>(data.size());
for(Map<String, String> d : data) {
if(checkExcel != null && !checkExcel.check(d)) {
continue;
}
T entity = clazz.newInstance();
for(String column : excelColumnNames) {
BeanUtils.setProperty(entity, column, d.get(column));
}
result.add(entity);
}
return result;
}
}
Check that the data in each row of excel is valid
import java.util.Map;
public interface CheckExcel {
public boolean check(Map<String, String> data);
}
Call part
List<Map<String, String>> data = ExcelUtils.getImportData(is,Constants.EXCEL_COLUMN_NAMES);
List<FeeAllocation> allocations = ExcelUtils.makeData(data, FeeAllocation.class, Constants.EXCEL_COLUMN_NAMES, new CheckExcel() {
public boolean check(Map<String, String> data) {
if(StringUtils.isEmpty(data.get("name")))
return false;
return true;
}
});