导入Excel 文件到页面中（转载）

转载处：https://blog.csdn.net/qq_29211883/article/details/70148405

1、导入相关jar包（文件上传和poi的jar）

2、html页面代码，form表单提交，也可以用ajax

3、Servlet代码，拿到上传的文件流
protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
response.setContentType(“text/html;charset=UTF-8”);
try {
FileItemFactory factory = new DiskFileItemFactory();
// 文件上传核心工具类
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setFileSizeMax(10 * 1024 * 1024); // 单个文件大小限制
upload.setSizeMax(50 * 1024 * 1024); // 总文件大小限制
upload.setHeaderEncoding(“UTF-8”); // 对中文文件编码处理

		if (ServletFileUpload.isMultipartContent(request)) {
			List<FileItem> list = upload.parseRequest(request);
			// 遍历
			for (FileItem item : list) {
				if (!item.isFormField()) {
					readExcel(item.getInputStream());
				}
			}
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
	
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
 *      response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	// TODO Auto-generated method stub
	doGet(request, response);
}

4、POI读取excel工具类
public static void readExcel(InputStream input) throws Exception {
Workbook wb = null;
try {
wb = WorkbookFactory.create(input);
Sheet sheet = wb.getSheetAt(0); // 获得第一个表单
int totalRow = sheet.getLastRowNum();// 得到excel的总记录条数
int columtotal = sheet.getRow(0).getPhysicalNumberOfCells();// 表头总共的列数
System.out.println(“总行数:” + totalRow + “,总列数:” + columtotal);
for (int i = 1; i <= totalRow; i++) {// 遍历行
for (int j = 0; j < columtotal; j++) {
sheet.getRow(i).getCell(j).setCellType(Cell.CELL_TYPE_STRING);
System.out.print(sheet.getRow(i).getCell(j).getStringCellValue() + " ");
}
System.out.println();
}

	} catch (Exception ex) {
		ex.printStackTrace();
		throw new Exception(ex);
	}finally {
		 try {
			input.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

5、测试
在浏览器中访问html

Excel文件内容如下：

eclipse控制台输出测试结果如下（第一行未打印是因为我从第二行开始循环的，一般第一行为表头，要打印第一行，将遍历行那儿的变量i=1改为i=0即可）：