java poi 操作 excel 读取本地Excel / 保存excel到本地 / url下载excel

pom.xml 配置poi版本

	<dependency>
		<groupId>org.apache.poi</groupId>
		<artifactId>poi</artifactId>
		<version>3.13</version>
	</dependency>
	<dependency>
		<groupId>org.apache.poi</groupId>
		<artifactId>poi-ooxml</artifactId>
		<version>3.13</version>
	</dependency>		

读取本地Excel文件

	private HSSFWorkbook getWorkBookFromExcel(){
		POIFSFileSystem filein = new POIFSFileSystem(new FileInputStream("E:\\files\\11.xls")); 
		HSSFWorkbook workbook = new HSSFWorkbook(filein);
		HSSFSheet aging = workbook.getSheet("Aging");
		HSSFSheet tmp = workbook.getSheet("tmp");
		HSSFSheet sheet0 = workbook.getSheetAt(0);
		return workbook ;
	}

获取Sheet、行Row、单元格C