java导出多sheet的excel

csv无法多sheet，JavaPOI导出excel有三种形式：HSSFworkbook,XSSFworkbook,SXSSFworkbook
区别如下：
https://blog.csdn.net/weixin_45631654/article/details/119457460?spm=1001.2014.3001.5502

本次示例是XSSFworkbook，
注意：单元格的限制是32767个字符，超出会报错导出失败。

依赖如下：

<properties>
<spring.version>4.3.19.RELEASE</spring.version>
<poi.version>3.16</poi.version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>${poi.version}</version>
</dependency>
</dependencies>

代码如下：

package csv;
import org.apache.poi.xssf.usermodel.*;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class POITEST {
public static void main(String[] args) {
try {
//excel导出的路径和名称
OutputStream out = new FileOutputStream("/home/quyanhang/Downloads/test.xlsx");
//生成两个sheet,不同的数据源和列标题
List<List<Object>> data1 = new ArrayList<>();
List<List<Object>> data2 = new ArrayList<>();
String[] headers1 = {"编号", "年龄", "用户名"};
String[] headers2 = {"编号", "用户名"};
HashMap<String, String[]> header = new HashMap<>();
header.put("表单-1", headers1);
header.put("表单-2", headers2);
//注意int等其他类型转换成String类型
//表单-2的数据内容
for (int i = 1; i < 5; i++) {
List rowData = new ArrayList();
rowData.add(String.valueOf(i));
rowData.add(String.valueOf(i + 20));
rowData.add("曲" + i + "号");
data1.add(rowData);
}
//表单-1的数据内容
for (int i = 1; i < 5; i++) {
List rowData = new ArrayList();
rowData.add(String.valueOf(i));
rowData.add("曲" + i + "号");
data2.add(rowData);
}
XSSFWorkbook workbook = new XSSFWorkbook();
HashMap<String, List<List<Object>>> map = new HashMap<>();
map.put("表单-1", data1);
map.put("表单-2", data2);
int a = 0;
for (String key : map.keySet()) {
System.out.println(key);
System.out.println(a);
exportExcel(workbook, a, key, header.get(key), map.get(key), out);
a = a + 1;
}
workbook.write(out);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* @param workbook
* @param sheetNum
sheet的位置，0表示第一个表格中的第一个sheet
* @param sheetTitle sheet的名称
* @param headers
标题
* @param result
内容
* @param out
输出流
*/
public static void exportExcel(XSSFWorkbook workbook, int sheetNum,
String sheetTitle, String[] headers, List<List<Object>> result,
OutputStream out) throws Exception {
// 生成一个表格
XSSFSheet sheet = workbook.createSheet();
workbook.setSheetName(sheetNum, sheetTitle);
// 设置表格默认列宽度为20个字节
sheet.setDefaultColumnWidth((short) 20);
// 产生表格标题行
XSSFRow row = sheet.createRow(0);
for (int i = 0; i < headers.length; i++) {
XSSFCell cell = row.createCell((short) i);
XSSFRichTextString text = new XSSFRichTextString(headers[i]);
cell.setCellValue(text.toString());
}
// 遍历集合数据，产生数据行
if (result != null) {
int index = 1;
for (List<Object> m : result) {
row = sheet.createRow(index);
int cellIndex = 0;
for (Object str : m) {
XSSFCell cell = row.createCell((short) cellIndex);
cell.setCellValue(str.toString());
cellIndex++;
}
index++;
}
}
}
}

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