Java 使用ApachePOI在Excel单元格循环时将数据打印到单元格中
我有Java程序,我希望将数据输出到Excel电子表格中。我发现我可以使用ApachePOI实现这一点。我试着用找到的例子,一切似乎都很好。但是,在示例程序中,每次迭代(循环)时,我都无法在Excel中打印新行 这是我的节目:Java 使用ApachePOI在Excel单元格循环时将数据打印到单元格中,java,excel,apache,Java,Excel,Apache,我有Java程序,我希望将数据输出到Excel电子表格中。我发现我可以使用ApachePOI实现这一点。我试着用找到的例子,一切似乎都很好。但是,在示例程序中,每次迭代(循环)时,我都无法在Excel中打印新行 这是我的节目: import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.sql.
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
public class Excel {
public static void main(String[] args) throws Exception {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("Sample sheet");
Map<String, Object[]> data = new HashMap<String, Object[]>();
data.put("1", new Object[] {"Emp No.", "Name", "Salary"});
for (int i=0;i<5;i++){
data.put("2", new Object[] {"5", "Jane", "300"});
}
Set<String> keyset = data.keySet();
int rownum = 0;
for (String key : keyset) {
Row row = sheet.createRow(rownum++);
Object [] objArr = data.get(key);
int cellnum = 0;
for (Object obj : objArr) {
Cell cell = row.createCell(cellnum++);
if(obj instanceof Date)
cell.setCellValue((Date)obj);
else if(obj instanceof Boolean)
cell.setCellValue((Boolean)obj);
else if(obj instanceof String)
cell.setCellValue((String)obj);
else if(obj instanceof Double)
cell.setCellValue((Double)obj);
}
}
try {
FileOutputStream out =
new FileOutputStream(new File("new.xls"));
workbook.write(out);
out.close();
System.out.println("Excel written successfully..");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
但它总是只打印Excel工作表中的第一行。任何熟悉使用ApachePOI的人都可以在这方面帮助我吗?谢谢 heredata.put(“2”,新对象[]{“5”,“Jane”,“300”})代码>
“2”->表示行数。所以总是替换第2行
所以,试着去做吧
for (int i=2;i<7;i++){
data.put(i + "", new Object[] {"5", "Jane", "300"});
}
for(int i=2;i您构建的数据集如下所示:
data.put("1", new Object[] {"Emp No.", "Name", "Salary"});
for (int i=0;i<5;i++){
data.put("2", new Object[] {"5", "Jane", "300"});
}
data.put(“1”,新对象[]{“Emp编号”,“名称”,“薪资”});
对于(int i=0;i
data.put("1", new Object[] {"Emp No.", "Name", "Salary"});
for (int i=0;i<5;i++){
data.put("2", new Object[] {"5", "Jane", "300"});
}
data.put(0, new Object[] {"Emp No.", "Name", "Salary"});
for (int i=1;i<6;i++){
data.put(i, new Object[] {"5", "Jane", "300"});
}