原文：https://www.jianshu.com/p/5d67fb720ece

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• 開(kāi)發(fā)中經(jīng)常會(huì)遇到excel的處理，導(dǎo)入導(dǎo)出解析等等，java中比較流行的用poi，但是每次都要寫大段工具類來(lái)搞定這事兒，此處推薦一個(gè)別人造好的輪子【easypoi】，下面介紹下“輪子”的使用。

pom引入

• 不再需要其他jar

<dependency><groupId>cn.afterturn</groupId> <artifactId>easypoi-base</artifactId> <version>3.0.3</version> </dependency> <dependency> <groupId>cn.afterturn</groupId> <artifactId>easypoi-web</artifactId> <version>3.0.3</version> </dependency> <dependency> <groupId>cn.afterturn</groupId> <artifactId>easypoi-annotation</artifactId> <version>3.0.3</version> </dependency>

編寫實(shí)體類

• 此處注意必須要有空構(gòu)造函數(shù)，否則會(huì)報(bào)錯(cuò)“對(duì)象創(chuàng)建錯(cuò)誤”
• 關(guān)于注解@Excel，其他還有@ExcelCollection，@ExcelEntity ，@ExcelIgnore，@ExcelTarget等，此處我們用不到，可以去官方查看更多

屬性類型類型說(shuō)明

name	String	null	列名
needMerge	boolean	fasle	縱向合并單元格
orderNum	String	"0"	列的排序,支持name_id
replace	String[]	{}	值得替換 導(dǎo)出是{a_id,b_id} 導(dǎo)入反過(guò)來(lái)
savePath	String	"upload"	導(dǎo)入文件保存路徑
type	int	1	導(dǎo)出類型 1 是文本 2 是圖片,3 是函數(shù),10 是數(shù)字 默認(rèn)是文本
width	double	10	列寬
height	double	10	列高,后期打算統(tǒng)一使用@ExcelTarget的height,這個(gè)會(huì)被廢棄,注意
isStatistics	boolean	fasle	自動(dòng)統(tǒng)計(jì)數(shù)據(jù),在追加一行統(tǒng)計(jì),把所有數(shù)據(jù)都和輸出這個(gè)處理會(huì)吞沒(méi)異常,請(qǐng)注意這一點(diǎn)
isHyperlink	boolean	false	超鏈接,如果是需要實(shí)現(xiàn)接口返回對(duì)象
isImportField	boolean	true	校驗(yàn)字段,看看這個(gè)字段是不是導(dǎo)入的Excel中有,如果沒(méi)有說(shuō)明是錯(cuò)誤的Excel,讀取失敗,支持name_id
exportFormat	String	""	導(dǎo)出的時(shí)間格式,以這個(gè)是否為空來(lái)判斷是否需要格式化日期
importFormat	String	""	導(dǎo)入的時(shí)間格式,以這個(gè)是否為空來(lái)判斷是否需要格式化日期
format	String	""	時(shí)間格式,相當(dāng)于同時(shí)設(shè)置了exportFormat 和 importFormat
databaseFormat	String	"yyyyMMddHHmmss"	導(dǎo)出時(shí)間設(shè)置,如果字段是Date類型則不需要設(shè)置 數(shù)據(jù)庫(kù)如果是string 類型,這個(gè)需要設(shè)置這個(gè)數(shù)據(jù)庫(kù)格式,用以轉(zhuǎn)換時(shí)間格式輸出
numFormat	String	""	數(shù)字格式化,參數(shù)是Pattern,使用的對(duì)象是DecimalFormat
imageType	int	1	導(dǎo)出類型 1 從file讀取 2 是從數(shù)據(jù)庫(kù)中讀取 默認(rèn)是文件 同樣導(dǎo)入也是一樣的
suffix	String	""	文字后綴,如% 90 變成90%
isWrap	boolean	true	是否換行 即支持\n
mergeRely	int[]	{}	合并單元格依賴關(guān)系,比如第二列合并是基于第一列 則{1}就可以了
mergeVertical	boolean	fasle	縱向合并內(nèi)容相同的單元格

import cn.afterturn.easypoi.excel.annotation.Excel;import java.util.Date;public class Person { @Excel(name = "姓名", orderNum = "0") private String name; @Excel(name = "性別", replace = {"男_1", "女_2"}, orderNum = "1") private String sex; @Excel(name = "生日", exportFormat = "yyyy-MM-dd", orderNum = "2") private Date birthday; public Person(String name, String sex, Date birthday) { this.name = name; this.sex = sex; this.birthday = birthday; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } }

導(dǎo)入導(dǎo)出公用方法

public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,String fileName,boolean isCreateHeader, HttpServletResponse response){ ExportParams exportParams = new ExportParams(title, sheetName); exportParams.setCreateHeadRows(isCreateHeader); defaultExport(list, pojoClass, fileName, response, exportParams); } public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,String fileName, HttpServletResponse response){ defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName)); } public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response){ defaultExport(list, fileName, response); } private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) { Workbook workbook = ExcelExportUtil.exportExcel(exportParams,pojoClass,list); if (workbook != null); downLoadExcel(fileName, response, workbook); } private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) { try { response.setCharacterEncoding("UTF-8"); response.setHeader("content-Type", "application/vnd.ms-excel"); response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8")); workbook.write(response.getOutputStream()); } catch (IOException e) { throw new NormalException(e.getMessage()); } } private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) { Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF); if (workbook != null); downLoadExcel(fileName, response, workbook); } public static <T> List<T> importExcel(String filePath,Integer titleRows,Integer headerRows, Class<T> pojoClass){ if (StringUtils.isBlank(filePath)){ return null; } ImportParams params = new ImportParams(); params.setTitleRows(titleRows); params.setHeadRows(headerRows); List<T> list = null; try { list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params); }catch (NoSuchElementException e){ throw new NormalException("模板不能為空"); } catch (Exception e) { e.printStackTrace(); throw new NormalException(e.getMessage()); } return list; } public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass){ if (file == null){ return null; } ImportParams params = new ImportParams(); params.setTitleRows(titleRows); params.setHeadRows(headerRows); List<T> list = null; try { list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params); }catch (NoSuchElementException e){ throw new NormalException("excel文件不能為空"); } catch (Exception e) { throw new NormalException(e.getMessage()); } return list; }

對(duì)的，沒(méi)看錯(cuò)，這就可以導(dǎo)出導(dǎo)入了,看起來(lái)代碼挺多，其實(shí)是提供了多個(gè)導(dǎo)入導(dǎo)出方法而已

測(cè)試

@RequestMapping("export")public void export(HttpServletResponse response){ //模擬從數(shù)據(jù)庫(kù)獲取需要導(dǎo)出的數(shù)據(jù) List<Person> personList = new ArrayList<>(); Person person1 = new Person("路飛","1",new Date()); Person person2 = new Person("娜美","2", DateUtils.addDate(new Date(),3)); Person person3 = new Person("索隆","1", DateUtils.addDate(new Date(),10)); Person person4 = new Person("小貍貓","1", DateUtils.addDate(new Date(),-10)); personList.add(person1); personList.add(person2); personList.add(person3); personList.add(person4); //導(dǎo)出操作 FileUtil.exportExcel(personList,"花名冊(cè)","草帽一伙",Person.class,"海賊王.xls",response); } @RequestMapping("importExcel") public void importExcel(){ String filePath = "F:\\海賊王.xls"; //解析excel， List<Person> personList = FileUtil.importExcel(filePath,1,1,Person.class); //也可以使用MultipartFile,使用 FileUtil.importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass)導(dǎo)入 System.out.println("導(dǎo)入數(shù)據(jù)一共【"+personList.size()+"】行"); //TODO 保存數(shù)據(jù)庫(kù) }

導(dǎo)出結(jié)果

導(dǎo)出結(jié)果

測(cè)試導(dǎo)入

導(dǎo)出結(jié)果再添加一行，執(zhí)行，輸出導(dǎo)入數(shù)據(jù)行數(shù)

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作者：小塵哥
鏈接：https://www.jianshu.com/p/5d67fb720ece
來(lái)源：簡(jiǎn)書
簡(jiǎn)書著作權(quán)歸作者所有，任何形式的轉(zhuǎn)載都請(qǐng)聯(lián)系作者獲得授權(quán)并注明出處。

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