Hutool Java工具類庫_ExcelUtil的使用
Hutool Java工具類庫_ExcelUtil
依賴
<!--Hutool Java工具包--> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.4.5</version> </dependency>
ExcelUtil
從文件中讀取Excel為ExcelReader
ExcelReader reader = ExcelUtil.getReader(FileUtil.file("test.xlsx"));
從流中讀取Excel為ExcelReader
ExcelReader reader = ExcelUtil.getReader(ResourceUtil.getStream("aaa.xlsx"));
讀取指定的sheet
ExcelReader reader; //通過sheet編號獲取 reader = ExcelUtil.getReader(FileUtil.file("test.xlsx"), 0); //通過sheet名獲取 reader = ExcelUtil.getReader(FileUtil.file("test.xlsx"), "sheet1");
ExcelReader
讀取Excel中所有行和列,都用列表表示
ExcelReader reader = ExcelUtil.getReader("d:/aaa.xlsx"); List<List<Object>> readAll = reader.read();
讀取為Map列表,默認第一行為標題行,Map中的key為標題,value為標題對應的單元格值
ExcelReader reader = ExcelUtil.getReader("d:/aaa.xlsx"); List<Map<String,Object>> readAll = reader.readAll();
讀取為Bean列表,Bean中的字段名為標題,字段值為標題對應的單元格值
ExcelReader reader = ExcelUtil.getReader("d:/aaa.xlsx"); List<Person> all = reader.readAll(Person.class);
ExcelWriter
Hutool將Excel寫出封裝為ExcelWriter,原理為包裝瞭Workbook對象,每次調用merge(合並單元格)或者write(寫出數據)方法後隻是將數據寫入到Workbook,並不寫出文件,隻有調用flush或者close方法後才會真正寫出文件。
由於機制原因,在寫出結束後需要關閉ExcelWriter對象,調用close方法即可關閉,此時才會釋放Workbook對象資源,否則帶有數據的Workbook一直會常駐內存
(1) 將行列對象寫出到Excel
List<String> row1 = CollUtil.newArrayList("aa", "bb", "cc", "dd"); List<String> row2 = CollUtil.newArrayList("aa1", "bb1", "cc1", "dd1"); List<String> row3 = CollUtil.newArrayList("aa2", "bb2", "cc2", "dd2"); List<String> row4 = CollUtil.newArrayList("aa3", "bb3", "cc3", "dd3"); List<String> row5 = CollUtil.newArrayList("aa4", "bb4", "cc4", "dd4"); List<List<String>> rows = CollUtil.newArrayList(row1, row2, row3, row4, row5); //通過工具類創建writer ExcelWriter writer = ExcelUtil.getWriter("d:/writeTest.xlsx"); //通過構造方法創建writer //ExcelWriter writer = new ExcelWriter("d:/writeTest.xls"); //跳過當前行,既第一行,非必須,在此演示用 writer.passCurrentRow(); //合並單元格後的標題行,使用默認標題樣式 writer.merge(row1.size() - 1, "測試標題"); //一次性寫出內容,強制輸出標題 writer.write(rows, true); //關閉writer,釋放內存 writer.close();
(2)寫出Map數據
Map<String, Object> row1 = new LinkedHashMap<>(); row1.put("姓名", "張三"); row1.put("年齡", 23); row1.put("成績", 88.32); row1.put("是否合格", true); row1.put("考試日期", DateUtil.date()); Map<String, Object> row2 = new LinkedHashMap<>(); row2.put("姓名", "李四"); row2.put("年齡", 33); row2.put("成績", 59.50); row2.put("是否合格", false); row2.put("考試日期", DateUtil.date()); ArrayList<Map<String, Object>> rows = CollUtil.newArrayList(row1, row2); // 通過工具類創建writer ExcelWriter writer = ExcelUtil.getWriter("d:/writeMapTest.xlsx"); // 合並單元格後的標題行,使用默認標題樣式 writer.merge(row1.size() - 1, "一班成績單"); // 一次性寫出內容,使用默認樣式,強制輸出標題 writer.write(rows, true); // 關閉writer,釋放內存 writer.close();
(3)寫出Bean數據
public class TestBean { private String name; private int age; private double score; private boolean isPass; private Date examDate; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public double getScore() { return score; } public void setScore(double score) { this.score = score; } public boolean isPass() { return isPass; } public void setPass(boolean isPass) { this.isPass = isPass; } public Date getExamDate() { return examDate; } public void setExamDate(Date examDate) { this.examDate = examDate; } } TestBean bean1 = new TestBean(); bean1.setName("張三"); bean1.setAge(22); bean1.setPass(true); bean1.setScore(66.30); bean1.setExamDate(DateUtil.date()); TestBean bean2 = new TestBean(); bean2.setName("李四"); bean2.setAge(28); bean2.setPass(false); bean2.setScore(38.50); bean2.setExamDate(DateUtil.date()); List<TestBean> rows = CollUtil.newArrayList(bean1, bean2); // 通過工具類創建writer ExcelWriter writer = ExcelUtil.getWriter("d:/writeBeanTest.xlsx"); // 合並單元格後的標題行,使用默認標題樣式 writer.merge(4, "一班成績單"); // 一次性寫出內容,使用默認樣式,強制輸出標題 writer.write(rows, true); // 關閉writer,釋放內存 writer.close();
(4)自定義Bean的key別名(排序標題)
在寫出Bean的時候,我們可以調用ExcelWriter對象的addHeaderAlias方法自定義Bean中key的別名,這樣就可以寫出自定義標題瞭
// 通過工具類創建writer ExcelWriter writer = ExcelUtil.getWriter("d:/writeBeanTest.xlsx"); //自定義標題別名 writer.addHeaderAlias("name", "姓名"); writer.addHeaderAlias("age", "年齡"); writer.addHeaderAlias("score", "分數"); writer.addHeaderAlias("isPass", "是否通過"); writer.addHeaderAlias("examDate", "考試時間"); // 合並單元格後的標題行,使用默認標題樣式 writer.merge(4, "一班成績單"); // 一次性寫出內容,使用默認樣式,強制輸出標題 writer.write(rows, true); // 關閉writer,釋放內存 writer.close();
java解析Excel使用hutool工具類
hutool包,真是好用,方便,強烈推薦…
https://hutool.cn/docs/index.html#/
然後使用Excel的工具類,還需要引入poi-ooxml包版本的話,報錯裡面有
自己確認一下就好瞭
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.17</version> </dependency>
一行代碼搞定:常用的就是read方法瞭.
ExcelReader reader = ExcelUtil.getReader(FileUtil.file("C:\\Users\\stack\\Desktop\\hanke\\aaa.xlsx"));
以上為個人經驗,希望能給大傢一個參考,也希望大傢多多支持WalkonNet。
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