标签：nmon str 重写 vat 使用指南 ice base cep integer
easyExcel导出excel的简单使用
Java解析、生成Excel比较有名的框架有Apache poi、jxl。但他们都存在一个严重的问题就是非常的耗内存，poi有一套SAX模式的API可以一定程度的解决一些内存溢出的问题，但POI还是有一些缺陷，比如07版Excel解压缩以及解压后存储都是在内存中完成的，内存消耗依然很大。easyexcel重写了poi对07版Excel的解析，能够原本一个3M的excel用POI sax依然需要100M左右内存降低到KB级别，并且再大的excel不会出现内存溢出，03版依赖POI的sax模式。在上层做了模型转换的封装，让使用者更加简单方便
easyexcel 项目git地址为: https://github.com/alibaba/easyexcel
官方使用指南见: https://github.com/alibaba/easyexcel/blob/master/quickstart.md
1：使用：
导入依赖maven依赖：
<dependency><groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>1.1.2-beta4</version>
</dependency>
2：模型映射
public class DownMonitorExcelSheet1 extends BaseRowModel { @ExcelProperty(value = "城市",index = 0) private String city; @ExcelProperty(value = "项目名字",index = 1) private String projectName; @ExcelProperty(value = "上刊数",index = 2) private Integer skNum; @ExcelProperty(value = "下刊数",index = 3) private Integer xkNum; public String getCity() { return city; } public void setCity(String city) { this.city = city; } public String getProjectName() { return projectName; } public void setProjectName(String projectName) { this.projectName = projectName; } public Integer getSkNum() { return skNum; } public void setSkNum(Integer skNum) { this.skNum = skNum; } public Integer getXkNum() { return xkNum; } public void setXkNum(Integer xkNum) { this.xkNum = xkNum; } }
3：service
@Override public void excelExportDownInfo(String schemeId, String pushDate, HttpServletResponse response) throws IOException { String fileName = String.valueOf(System.currentTimeMillis()); response.setContentType("multipart/form-data"); response.setCharacterEncoding("utf-8"); response.addHeader("Content-Disposition", "filename=" + fileName+ ".xlsx"); String sheet1Name = "下刊监测统计"; String sheet2Name = "已下刊"; String sheet3Name = "未下刊"; ExcelWriter writer = new ExcelWriter(response.getOutputStream(), ExcelTypeEnum.XLSX); //写第一个sheet, sheet1 数据全是List<String> 无模型映射关系 Sheet sheet = new Sheet(1, 0,DownMonitorExcelSheet1.class); sheet.setSheetName(sheet1Name); //下刊监测统计 List<DownMonitorExcelSheet1> downMonitorExcelSheet1s = pushMonitorDao.queryDownMonitorExcelSheet1(schemeId, pushDate); writer.write(downMonitorExcelSheet1s, sheet);
//已下刊 sheet2 // List<DownMonitorExcelSheet2> downMonitorExcelSheet2s = pushMonitorDao.queryDownMonitorExcelSheet2(schemeId, pushDate); // Sheet sheet2 = new Sheet(2, 0, DownMonitorExcelSheet2.class); // sheet2.setSheetName(sheet2Name); // writer.write(downMonitorExcelSheet2s,sheet2); //未下刊 sheet3 // List<DownMonitorExcelSheet2> downMonitorExcelSheet3 = pushMonitorDao.queryDownMonitorExcelSheet3(schemeId, pushDate); // Sheet sheet3 = new Sheet(3, 0, DownMonitorExcelSheet2.class); // sheet3.setSheetName(sheet3Name); // writer.write(downMonitorExcelSheet3,sheet3); writer.finish(); }
标签：nmon str 重写 vat 使用指南 ice base cep integer
原文地址：https://www.cnblogs.com/dw3306/p/10551330.html
