摘要：
1、 pom。xml<；相关性>；&书信电报；组ID>；通用域名格式。阿里巴巴<；/组ID>；&书信电报；artifactId>；easyexcel<；/artifactId>；&书信电报；版本>；2.2.6<；/版本>；<；/依赖性>；2、 你必须在写作前完成。如果你没有完成，你只会创建一个emp
一.pom.xml
<dependency> <groupId>com.alibaba</groupId> <artifactId>easyexcel</artifactId> <version>2.2.6</version> </dependency>
二.必须要finish才会写入，不finish只会创建empty的文件。
WriteSheet writeSheet = EasyExcel.writerSheet("测试1").head(list).build();
excelWriter.write(data, writeSheet);
//必须要finish才会写入，不finish只会创建一个empty的文件。
excelWriter.finish();三.template和file不能是通一个，file会将template文件清掉。
//以下写法是错误的 ExcelWriter excelWriter2 = EasyExcel.write().withTemplate(filePath1st).file(filePath1st).autoCloseStream(true).build();
四.一个ExcelWriter能够写多个Sheet。
//第一次写入 ExcelWriter excelWriter = EasyExcel.write().file(filePath1st).autoCloseStream(true).build(); WriteSheet writeSheet = EasyExcel.writerSheet("测试1").head(list).build(); excelWriter.write(data, writeSheet); //第二次写入 WriteSheet writeSheet2 = EasyExcel.writerSheet("测试2").head(list).build(); excelWriter.write(data, writeSheet2); //必须要finish才会写入，不finish只会创建一个empty的文件。 excelWriter.finish();
五.不支持多线程写
//初始化 ExcelWriter ExcelWriter excelWriter = EasyExcel.write().file(filePath1st).build(); for(int j=0;j<=9;j++) { WriteSheet writeSheet = EasyExcel.writerSheet(j,"测试"+j).head(list).build(); new Thread(new WriteSheetThread(excelWriter,writeSheet,data)).start(); } excelWriter.finish();
如上写法是错误的，无法正确运行。
线程类代码如下
static class WriteSheetThread implements Runnable{ private ExcelWriter excelWriter; private WriteSheet writeSheet; private List<List<Object>> data; public WriteSheetThread(ExcelWriter excelWriter, WriteSheet writeSheet, List<List<Object>> data) { this.excelWriter = excelWriter; this.writeSheet = writeSheet; this.data = data; } @Override public void run() { writeExcel(); } private void writeExcel(){ System.out.println(writeSheet); excelWriter.write(data, writeSheet); } }
六.正确写多个sheet的方式
//初始化 ExcelWriter ExcelWriter excelWriter = EasyExcel.write().file(filePath1st).build(); //正确流程，在单线程中依次写多个文件。 for(int j=0;j<=9;j++) { WriteSheet writeSheet = EasyExcel.writerSheet(j,"测试"+j).head(list).build(); excelWriter.write(data, writeSheet); } excelWriter.finish();