阿里巴巴Excel導出優化速度 ,64M內存20秒讀取75M(46W行25列)的Excel（3.0.2+版本）

官方文檔：EasyExcel · 語雀EasyExcel是一個基于Java的簡單、省內存的讀...https://www.yuque.com/easyexcel/doc/easyexcel

導入阿里Excel最新依賴

<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.0.5</version></dependency>

創建表格實體類

public class NoDataUser {@ExcelProperty("序號") //設置列名稱private Integer no;@ExcelIgnore //導入時 忽略該屬性private Long consId;@ExcelProperty("用戶戶號")private String consNo;@ExcelIgnoreprivate String orgNo;@ExcelProperty("用戶名稱")private String consName;@ExcelProperty("供電單位")private String orgName;@ExcelProperty("運行容量(kVA)")private Double runCap;@ExcelProperty("電源類型")private String type;public Integer getNo() {return no;}public void setNo(Integer no) {this.no = no;}public Long getConsId() {return consId;}public void setConsId(Long consId) {this.consId = consId;}public String getConsNo() {return consNo;}public void setConsNo(String consNo) {this.consNo = consNo;}public String getOrgNo() {return orgNo;}public void setOrgNo(String orgNo) {this.orgNo = orgNo;}public String getConsName() {return consName;}public void setConsName(String consName) {this.consName = consName;}public String getOrgName() {return orgName;}public void setOrgName(String orgName) {this.orgName = orgName;}public Double getRunCap() {return runCap;}public void setRunCap(Double runCap) {this.runCap = runCap;}public String getType() {return type;}public void setType(String type) {this.type = type;} }

導出表格

//要導出的List數據 List<NoDataUser> noDataUserList = loadCharactService.findNoDataUser(orgNo, type);String fileName = "用戶信息";try (ServletOutputStream out = response.getOutputStream()) {String disposition = "attachment; fileName=" +new String(fileName.getBytes("UTF-8"), "ISO-8859-1") + ".xls";response.setCharacterEncoding("utf8");response.setContentType("text/xls");response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName + ".xls", "UTF-8"));response.setHeader("Content-Disposition", disposition);EasyExcel.write(out, NoDataUser.class).sheet(1).doWrite(noDataUserList);out.flush();} catch (IOException e) {throw new RuntimeException();}

總結

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