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Java項目中如何用POI導(dǎo)出數(shù)據(jù)到Excel文件中

獨留清風(fēng)醉 2021-08-10 14:15:28 瀏覽數(shù) (2140)
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在項目開發(fā)的過程中,少不了要把數(shù)據(jù)導(dǎo)入導(dǎo)出,把數(shù)據(jù)導(dǎo)出到Excel文檔中又是經(jīng)常使用的。本篇文章將介紹一個Java提供的POI來實現(xiàn)把數(shù)據(jù)導(dǎo)出到Excel文檔中。

一、前言

需要用到的jar包 poi-3.17.jar

二、具體實現(xiàn)步驟

//第一步創(chuàng)建一個webbook,對應(yīng)一個Excel文件
	HSSFWorkbook wb=new HSSFWorkbook();
	//第二步,在webbook中添加一個sheet,對應(yīng)Excel文件中的sheet
	HSSFSheet sheet=wb.createSheet("食物信息數(shù)據(jù)");
	//第三步,在sheet中添加表頭第0行
	HSSFRow row = sheet.createRow(0);
	//第四步,創(chuàng)建單元格,并設(shè)置表頭居中
	HSSFCellStyle style = wb.createCellStyle();
	style.setAlignment(HorizontalAlignment.CENTER);//居中格式
	HSSFCell cell = row.createCell(0);
	cell.setCellValue("編號");
	cell.setCellStyle(style);
	
	cell=row.createCell((short)1);
	cell.setCellValue("名稱");
	cell.setCellStyle(style);
	
	cell=row.createCell((short)2);
	cell.setCellValue("類型");
	cell.setCellStyle(style);
	
	cell=row.createCell((short)3);
	cell.setCellValue("單價");
	cell.setCellStyle(style);
	
	cell=row.createCell((short)4);
	cell.setCellValue("庫存");
	cell.setCellStyle(style);
	
	//第五步,寫入實體數(shù)據(jù),從數(shù)據(jù)庫拿數(shù)據(jù)
	FoodController controller=new FoodController();
	List<Foods> foodsList = controller.foodsList(null, null);
	for (int i = 0; i < foodsList.size(); i++) {
		//創(chuàng)建單元格,并賦值
		row=sheet.createRow(i+1);
		Foods foods = foodsList.get(i);
		row.createCell((short)0).setCellValue(foods.getId());
		row.createCell((short)1).setCellValue(foods.getName());
		row.createCell((short)2).setCellValue(foods.getType());
		row.createCell((short)3).setCellValue(foods.getPrice());
		row.createCell((short)4).setCellValue(foods.getNum());
	}
	//第六步,下載Excel
	OutputStream out=null;
	out=response.getOutputStream();
	String fileName="食物信息.xls";
	response.setContentType("application/x-=msdownload");
	response.setHeader("Content-Disposition", "attachment; filename="
			+URLEncoder.encode(fileName, "UTF-8"));
	wb.write(out);

三、實現(xiàn)效果圖

導(dǎo)出成功后數(shù)據(jù)成功顯示

2021042211335960

以上就是關(guān)于Java中POI的使用,以及使用POI導(dǎo)出數(shù)據(jù)到Excel的步驟,想要了解更多Java POI導(dǎo)出數(shù)據(jù)到其他文檔文件的內(nèi)容,可以瀏覽W3Cschool相關(guān)技術(shù)文章,希望本篇文章能夠?qū)Υ蠹业膶W(xué)習(xí)有所幫助!


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