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在平時的開發中,我們會經常遇到這樣一個需求,要在頁面通過一個『導出』按鈕把查詢出的數據導出到 Excel 表格中。本文即為實現上述需求的一個小實例。
本 Demo 是在 SpringMVC框架中實現。
export.jsp 很簡單,就只有一個超鏈接。
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>數據導出Excel測試界面</title> </head> <body> <a href="${pageContext.request.contextPath}/export.action" rel="external nofollow" >導出</a> </body> </html>
public class Person { private String name; private String age; private String addr; private String sex; // set/get方法和構造器省略。。。
package com.export.action; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.Iterator; import java.util.List; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFRichTextString; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import com.export.pojo.Person; /** * 數據導出到Excel工具類 * * @author zhang_cq * */ public class ExportUtil { /** * 設置導出Excel的表名 * * @return */ public String getSheetName() { return "測試導出數據"; } /** * 設置導出Excel的列名 * * @return */ public String getSheetTitleName() { return "序號,姓名,年齡,居住地,性別"; } /** * 創建 sheet 的第一行,標題行 * * @param sheet * @param strTitle */ private void createSheetTitle(HSSFSheet sheet, String strTitle) { HSSFRow row = sheet.createRow(0); // 創建該表格(sheet)的第一行 sheet.setDefaultColumnWidth(4); HSSFCell cell = null; String[] strArray = strTitle.split(","); for (int i = 0; i < strArray.length; i++) { cell = row.createCell(i); // 創建該行的第一列 cell.setCellType(HSSFCell.CELL_TYPE_STRING); cell.setCellValue(new HSSFRichTextString(strArray[i])); } } @SuppressWarnings("resource") public InputStream getExcelStream(List<Person> personList) throws IOException { // 創建一個 Excel 文件 HSSFWorkbook wb = new HSSFWorkbook(); // 創建一個表格 Sheet HSSFSheet sheet = wb.createSheet(this.getSheetName()); // 創建 sheet 的第一行,標題行 // 行號從0開始計算 this.createSheetTitle(sheet, this.getSheetTitleName()); // 設置 sheet 的主體內容 this.createSheetBody(personList, sheet); ByteArrayOutputStream output = new ByteArrayOutputStream(); wb.write(output); byte[] ba = output.toByteArray(); InputStream is = new ByteArrayInputStream(ba); return is; } private void createSheetBody(List<Person> personList, HSSFSheet sheet) { if (personList == null || personList.size() < 1) { return; } // 表格(sheet) 的第二行, 第一行是標題, Excel中行號, 列號 是由 0 開始的 int rowNum = 1; HSSFCell cell = null; HSSFRow row = null; for (Iterator<Person> it = personList.iterator(); it.hasNext(); rowNum++) { Person person = (Person) it.next(); if (person == null) person = new Person(); row = sheet.createRow(rowNum); int i = 0; cell = row.createCell(i++); cell.setCellType(HSSFCell.CELL_TYPE_STRING); cell.setCellValue(new HSSFRichTextString(rowNum + "")); cell = row.createCell(i++); // name cell.setCellType(HSSFCell.CELL_TYPE_STRING); cell.setCellValue(new HSSFRichTextString(person.getName())); cell = row.createCell(i++); // age cell.setCellType(HSSFCell.CELL_TYPE_STRING); cell.setCellValue(new HSSFRichTextString(person.getAge())); cell = row.createCell(i++); // addr cell.setCellType(HSSFCell.CELL_TYPE_STRING); cell.setCellValue(new HSSFRichTextString(person.getAddr())); cell = row.createCell(i++); // sex cell.setCellType(HSSFCell.CELL_TYPE_STRING); cell.setCellValue(new HSSFRichTextString(person.getSex())); } } }
package com.export.action; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import com.export.pojo.Person; /** * @author zhang_cq * @version V1.0 */ @Controller public class ExportData { /** * 起始頁面 * * @return */ @RequestMapping("/index") public String login() { return "index"; } /** * 導出Excel * * @author zhang_cq */ @RequestMapping("/export") public String export(HttpServletRequest request, HttpServletResponse response) throws Exception { // 設置導出的編碼格式,此處統一為UTF-8 response.setContentType("application/vnd.ms-excel;charset=utf-8"); // 設置導出文件的名稱 response.setHeader("Content-Disposition", "attachment;filename=" + new String("數據導出Excel測試.xls".getBytes(), "iso-8859-1")); // 模擬表格需要導出的數據 Person p1 = new Person("張三", "22", "北京", "男"); Person p2 = new Person("李四", "23", "濟南", "女"); Person p3 = new Person("王五", "24", "上海", "男"); List<Person> personList = new ArrayList<Person>(); personList.add(p1); personList.add(p2); personList.add(p3); // 實際應用中這個地方會判斷獲取的數據,如果沒有對應的數據則不導出,如果超過2000條,則只導出2000條 if (personList.size() == 0) { PrintWriter print = response.getWriter(); print.write("沒有需要導出的數據!"); return null; } ServletOutputStream out = response.getOutputStream(); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { ExportUtil dataExportUtil = new ExportUtil(); bis = new BufferedInputStream(dataExportUtil.getExcelStream(personList)); bos = new BufferedOutputStream(out); byte[] buff = new byte[2048]; int bytesRead; while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead); } bos.flush(); } catch (final IOException e) { System.out.println("數據導出列表導出異常!"); } finally { if (bis != null) { bis.close(); } if (bos != null) { bos.close(); } } return "export"; } }
至此,就是Java將數據導出Excel文件格式的方法,更多關于這方面的文章請查看下面的相關鏈接
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