public class TestEasyExcel {
	public static void main(String[] args) throws Exception {
		String filepath = "D:/LDT/测试easyExcel.xlsx";
		Sheet sheet = new Sheet(1, 0);
		sheet.setSheetName("xxxx");
		List<List<String>> header = new ArrayList<List<String>>();
		header.add(Lists.newArrayList("Number"));
		header.add(Lists.newArrayList("Name"));
		header.add(Lists.newArrayList("Age"));
		sheet.setHead(header);
		
		List<List<Object>> data = new ArrayList<List<Object>>();
		data.add(Lists.newArrayList("1001","Zhangsan",13));
		data.add(Lists.newArrayList("1002","Lisi",23));
		data.add(Lists.newArrayList("1003","Wangwu",33));
		
		OutputStream out = new FileOutputStream(new File(filepath));
		ExcelWriter writer = EasyExcelFactory.getWriter(out, ExcelTypeEnum.XLSX, true);
		System.out.println(writer);
		writer.write1(data, sheet);
		writer.finish();
	}
}

Error message: org.apache.poi.ss.usermodel.font.setbold (z) V

Cause: there is a conflict between Maven version and poi jar package. The following is Maven version. If POI version is 3.8 or 3.9, this exception message will appear.

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>1.1.2-beta4</version>
        </dependency>

Solution: this exception will not occur in version 3.17 and above.

        <dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>4.1.1</version>
		</dependency>
		<dependency> 
		    <groupId>org.apache.poi</groupId>
		    <artifactId>poi-ooxml</artifactId>
		    <version>4.1.1</version>
		 </dependency>