java導出到excel常用的幾種方式總結(jié)
java導出excel常用的方式使用poi apache開源方式導入導出,很多公司自己研發(fā)導出組件對于常用的導入導出其實都使用開源組件。
介紹常用的excel導出方式:
1,poi 方式
上圖一個我之前寫的很老的導出,代碼比較麻煩,但是也是比較穩(wěn)定的一個版本:
pom依賴:
<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.9</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml-schemas</artifactId> <version>3.9</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.9</version> </dependency>
定義一個下載抽象接口:
package com.bootdo.common.service; import javax.servlet.http.HttpServletResponse; import java.util.Map; public interface DownExcelService { void downexcel(HttpServletResponse response, Map<String, String> params) throws Exception; }
定義一個抽象接口實現(xiàn)類
package com.bootdo.common.controller.detail; import com.bootdo.common.service.DownExcelService; import javax.servlet.http.HttpServletResponse; import java.util.Map; public abstract class AbstractDetaliCallBackServiceImpl implements DownExcelService { @Override public void downexcel(HttpServletResponse response, Map<String, String> params) throws Exception { } }
定義實現(xiàn)類集成抽象接口:
package com.bootdo.common.downInterface; import com.bootdo.common.config.Constant; import com.bootdo.common.config.WorkflowConfigCodeConstants; import com.bootdo.common.domain.AdvanceDO; import com.bootdo.common.service.AdvanceService; import com.bootdo.common.utils.CommonMethod; import org.apache.commons.lang3.ObjectUtils; import org.apache.commons.lang3.StringUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import javax.servlet.http.HttpServletResponse; import java.util.HashMap; import java.util.List; import java.util.Map; @Service(WorkflowConfigCodeConstants.ADVANCE_DOWNXECEL) public class AdvaceDownExcelServiceImpl extends AbstractExcelCallBackServiceImpl { @Autowired private AdvanceService advanceService; @Override public void downexcel(HttpServletResponse response, Map<String, String> params) throws Exception { String date = params.get("date"); String name = params.get("name"); String proparentId = params.get("proparentId"); Map<String, Object> map = new HashMap(); if (StringUtils.isNotBlank(ObjectUtils.toString(params.get("date"), ""))) { String[] dateBteetn = CommonMethod.getDate(params.get("date").toString()); map.put("startDate" , dateBteetn[0]); map.put("stopDate" , dateBteetn[1]); } if (StringUtils.isNotBlank(ObjectUtils.toString(params.get("name"), ""))) { map.put("name" , params.get("name").toString()); } if (StringUtils.isNotBlank(ObjectUtils.toString(params.get("proparentId"), ""))) { map.put("proparentId" , params.get("proparentId").toString()); } String typeNames = CommonMethod.typeNameExcel(date, name, proparentId); List<AdvanceDO> list = advanceService.list(map); CommonMethod.downexcel(response, list, Constant.EXCELE_ADVANCE_STATUS, typeNames, 6); } }
常量策略類:
package com.bootdo.common.config; /** * Excel 下載接口 * * @author yangchang */ public interface WorkflowConfigCodeConstants { /** * 工人總賬目 */ String ADVANCE_SUM_DOWNXECEL = "advacnsum_downexcel"; /** * 工人借支 */ String ADVANCE_DOWNXECEL = "advacn_downexcel"; /** * 材料 */ String METATLE_DOWNXECEL = "metail_downexcel"; /** * 公司生活費 */ String COMPANYREMITTANCE_DOWNXECEL = "companyremittance_downexcel"; /** * 突擊信息 */ String ASSAULT_DOWNXECEL = "assault_downexcel"; }
控制器的調(diào)用方式:
package com.bootdo.common.controller; import com.bootdo.common.annotation.Log; import com.bootdo.common.config.ApplicationContextProvider; import com.bootdo.common.service.DownExcelService; import org.apache.shiro.authz.annotation.RequiresPermissions; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import javax.servlet.http.HttpServletResponse; import java.util.Map; @Controller @RequestMapping("/common/excel") public class DownExcelController extends BaseController { @Log("下載到Excel") @RequestMapping("/downexcel") @RequiresPermissions("common:downexcel:downexcel") public void downexcel(HttpServletResponse response, @RequestParam Map<String, String> params) { String type = params.get("type"); try { DownExcelService workflowCallBackService = (DownExcelService) ApplicationContextProvider.getBean(type); workflowCallBackService.downexcel(response, params); } catch (Exception e) { e.printStackTrace(); } } }
工具類導出:
/** * 下載excel * * @param response * @param list * @param status * @param typename * @throws Exception */ public static void downexcel(HttpServletResponse response, List<?> list, String status, String title, int size) throws Exception { response.setContentType("application/vnd.ms-excel"); DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); double money = 0.0; List<CompanyremittanceDO> colist = null; String fileName = URLEncoder.encode(title + "信息表" , "utf-8"); response.setHeader("Content-disposition" , "attachment;fileName=" + fileName + ".xls"); // 創(chuàng)建一個輸出流 // 創(chuàng)建一個輸出流 OutputStream out = response.getOutputStream(); // 創(chuàng)建一個excel工作簿,將輸出流給我們的workbook WritableWorkbook wb = Workbook.createWorkbook(out); // 創(chuàng)建一個sheet(sheet名,位置) WritableSheet sheet = wb.createSheet(title, 200); // 設(shè)置樣式 // sheet. sheet.getSettings().setDefaultColumnWidth(15);// 設(shè)置列寬 sheet.getSettings().setDefaultRowHeight(500);// 設(shè)置行高 // 設(shè)置字體(字體,大小,粗細)只創(chuàng)建了字體,但是沒有應用這個字體 WritableFont font = new WritableFont(WritableFont.ARIAL, 12, WritableFont.NO_BOLD); // 將字體應用到單元格 WritableCellFormat format = new WritableCellFormat(font); // 設(shè)置邊框 format.setBorder(Border.ALL, BorderLineStyle.THIN); // 設(shè)置對齊方式 format.setAlignment(Alignment.CENTRE); // 如果內(nèi)容超出列寬,自動換行 format.setWrap(true); // 將內(nèi)容寫入 WritableFont font2 = new WritableFont(WritableFont.ARIAL, 30, WritableFont.BOLD); WritableCellFormat format2 = new WritableCellFormat(font2); format2.setAlignment(Alignment.CENTRE); sheet.mergeCells(0, 0, size, 0); // 創(chuàng)建一個標簽,存放標題title(存放的同時,將title的位置和格式都存好了) Label label = new Label(0, 0, title, format2); // 將標題放入到sheet中 sheet.addCell(label); switch (status) { case "1": // 小標題 sheet.addCell(new Label(0, 1, "編號" , format)); sheet.addCell(new Label(1, 1, "工作內(nèi)容" , format)); sheet.addCell(new Label(2, 1, "工作進度" , format)); sheet.addCell(new Label(3, 1, "工作名稱" , format)); sheet.addCell(new Label(4, 1, "工作記錄人" , format)); sheet.addCell(new Label(5, 1, "工作計劃開始時間" , format)); sheet.addCell(new Label(6, 1, "工作計劃結(jié)束時間" , format)); sheet.addCell(new Label(7, 1, "分類" , format)); List<WorkPlan> dictList = (List<WorkPlan>) list; for (int i = 0; i < dictList.size(); i++) { sheet.addCell(new Label(0, (i + 2), i + 1 + "" , format)); sheet.addCell(new Label(1, (i + 2), dictList.get(i).getWorkmessage() + "" , format)); sheet.addCell(new Label(2, (i + 2), dictList.get(i).getWorkprogress(), format)); sheet.addCell(new Label(3, (i + 2), dictList.get(i).getWorkname() + "" , format)); sheet.addCell(new Label(4, (i + 2), dictList.get(i).getWorkthis() + "" , format)); sheet.addCell(new Label(5, (i + 2), formatDate(dictList.get(i).getWorkstartdate()) + "" , format)); sheet.addCell(new Label(6, (i + 2), formatDate(dictList.get(i).getWorkstopdate()) + "" , format)); sheet.addCell(new Label(7, (i + 2), getProjectname(dictList.get(i).getProparentid().toString()), format)); } break; case "2": // 小標題 sheet.addCell(new Label(0, 1, "編號" , format)); sheet.addCell(new Label(1, 1, "打款金額" , format)); sheet.addCell(new Label(2, 1, "打款日期" , format)); sheet.addCell(new Label(3, 1, "匯款人名稱" , format)); sheet.addCell(new Label(4, 1, "備注" , format)); sheet.addCell(new Label(5, 1, "公司名稱" , format)); sheet.addCell(new Label(6, 1, "分類" , format)); List<CompanyadvanceDO> companyadvanceDOS = (List<CompanyadvanceDO>) list; double companyMoney = 0.0; for (int i = 0; i < companyadvanceDOS.size(); i++) { companyMoney += companyadvanceDOS.get(i).getCompanyMoney(); sheet.addCell(new Label(0, (i + 2), i + 1 + "" , format)); sheet.addCell(new Label(1, (i + 2), companyadvanceDOS.get(i).getCompanyMoney() + "" , format)); sheet.addCell(new Label(2, (i + 2), companyadvanceDOS.get(i).getCompanyDate(), format)); sheet.addCell(new Label(3, (i + 2), companyadvanceDOS.get(i).getCmpname(), format)); sheet.addCell(new Label(4, (i + 2), companyadvanceDOS.get(i).getDecptions() + "" , format)); sheet.addCell(new Label(5, (i + 2), companyadvanceDOS.get(i).getCompanyName() + "" , format)); sheet.addCell(new Label(6, (i + 2), getProjectname(companyadvanceDOS.get(i).getProparentId().toString()), format)); } WritableCellFormat format3 = new WritableCellFormat(font2); // 追加最后一行 Label label2 = new Label(0, companyadvanceDOS.size() + 2, "合計:" + String.valueOf(companyMoney) + "\n\n\n\n\n" , format3); sheet.addCell(label2); break; WritableCellFormat processFormat = new WritableCellFormat(font2); // 追加最后一行 Label processLabel = new Label(0, node, "合計:" + formatNumber(win).toString(), processFormat); sheet.addCell(processLabel); break; } if (status.equals("7")) { WritableCellFormat format3 = new WritableCellFormat(font2); // 追加最后一行 Label label2 = new Label(0, colist.size() + 2, "合計:" + String.valueOf(money), format3); sheet.addCell(label2); } // 關(guān)閉資源 wb.write(); wb.close(); out.flush(); out.close(); }
這種方式代碼其實是比較冗余的,這也是比較老的一種方式,當然代碼肯定還有優(yōu)化的程度,封裝公共的列名導出。
2,easypoi-base 方式
package com.volvo.admin.charging.provider.service.impl; import org.apache.poi.ss.usermodel.BorderStyle; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.FillPatternType; import org.apache.poi.ss.usermodel.Font; import org.apache.poi.ss.usermodel.HorizontalAlignment; import org.apache.poi.ss.usermodel.IndexedColors; import org.apache.poi.ss.usermodel.VerticalAlignment; import org.apache.poi.ss.usermodel.Workbook; import cn.afterturn.easypoi.excel.export.styler.AbstractExcelExportStyler; import cn.afterturn.easypoi.excel.export.styler.IExcelExportStyler; /** * @Description: 自定義報表導出樣式,可以修改表頭顏色,高度等 **/ public class ExcelExportMyStylerImpl extends AbstractExcelExportStyler implements IExcelExportStyler { public ExcelExportMyStylerImpl(Workbook workbook) { super.createStyles(workbook); } @Override public CellStyle getTitleStyle(short color) { CellStyle titleStyle = workbook.createCellStyle(); Font font = workbook.createFont(); font.setBold(true);// 加粗 titleStyle.setFont(font); titleStyle.setAlignment(HorizontalAlignment.CENTER);// 居中 titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中 titleStyle.setFillForegroundColor(IndexedColors.AQUA.index);// 設(shè)置顏色 titleStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND); titleStyle.setBorderRight(BorderStyle.THIN); titleStyle.setWrapText(true); return titleStyle; } @SuppressWarnings("deprecation") @Override public CellStyle stringSeptailStyle(Workbook workbook, boolean isWarp) { CellStyle style = workbook.createCellStyle(); style.setAlignment(CellStyle.ALIGN_CENTER); style.setVerticalAlignment(CellStyle.VERTICAL_CENTER); style.setDataFormat(STRING_FORMAT); if (isWarp) { style.setWrapText(true); } return style; } @Override public CellStyle getHeaderStyle(short color) { CellStyle titleStyle = workbook.createCellStyle(); Font font = workbook.createFont(); font.setBold(true);// 加粗 font.setColor(IndexedColors.RED.index); font.setFontHeightInPoints((short) 11); titleStyle.setFont(font); titleStyle.setAlignment(HorizontalAlignment.CENTER);// 居中 titleStyle.setFillForegroundColor(IndexedColors.WHITE.index);// 設(shè)置顏色 titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中 titleStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND); titleStyle.setBorderRight(BorderStyle.THIN); titleStyle.setWrapText(true); return titleStyle; } @SuppressWarnings("deprecation") @Override public CellStyle stringNoneStyle(Workbook workbook, boolean isWarp) { CellStyle style = workbook.createCellStyle(); style.setAlignment(CellStyle.ALIGN_CENTER); style.setVerticalAlignment(CellStyle.VERTICAL_CENTER); style.setDataFormat(STRING_FORMAT); if (isWarp) { style.setWrapText(true); } return style; } }
導出工具類:
package com.volvo.admin.charging.provider.utils; import cn.afterturn.easypoi.excel.ExcelExportUtil; import cn.afterturn.easypoi.excel.entity.ExportParams; import com.volvo.admin.charging.provider.service.impl.ExcelExportMyStylerImpl; import org.apache.poi.ss.usermodel.Workbook; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletResponse; import java.net.URLEncoder; import java.text.SimpleDateFormat; import java.util.Collection; import java.util.Date; /** * @Version 1.0 **/ public class MyExcelExportUtil { /** * Excel文件導出,導出的文件名默認為:headTitle+當前系統(tǒng)時間 * @param listData 要導出的list數(shù)據(jù) * @param pojoClass 定義excel屬性信息 * @param headTitle Excel文件頭信息 * @param sheetName Excel文件sheet名稱 * @param response */ public static void exportExcel(Collection<?> listData,Class<?> pojoClass, String headTitle, String sheetName, HttpServletResponse response) { ExportParams params = new ExportParams(headTitle, sheetName); params.setHeight((short) 8); params.setStyle(ExcelExportMyStylerImpl.class); try { Workbook workbook = ExcelExportUtil.exportExcel(params, pojoClass, listData); String fileName = headTitle + new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()); fileName = URLEncoder.encode(fileName, "UTF8"); response.setContentType("application/vnd.ms-excel;chartset=utf-8"); response.setHeader("Content-Disposition", "attachment;filename="+fileName + ".xls"); ServletOutputStream out=response.getOutputStream(); workbook.write(out); out.flush(); out.close(); } catch (Exception e) { e.printStackTrace(); } } }
service直接導出:
MyExcelExportUtil.exportExcel(orderResult.getRecords(),ChargeOrderBO.class,"充電訂單","充電訂單",response);
3,easyexcel 方式
pom包:
<dependency> <groupId>com.alibaba</groupId> <artifactId>easyexcel</artifactId> <version>3.1.1</version> </dependency>
service方式:
try { try (ExcelWriter excelWriter = EasyExcelFactory.write(getOutputStream(fileName, response), ChargingPileVO.class).build()) { WriteSheet writeSheet = EasyExcel.writerSheet("家充樁安裝記錄").build(); excelWriter.write(result, writeSheet); } } catch (Exception e) { log.info("家充樁安裝導出excle數(shù)據(jù)異常:{}", e.getMessage()); } /** * 構(gòu)建輸出流 * * @param fileName:文件名稱 * @param response: * @return * @throws Exception */ private OutputStream getOutputStream(String fileName, HttpServletResponse response) throws Exception { fileName = URLEncoder.encode(fileName, "UTF-8"); response.setContentType("application/vnd.ms-excel"); response.setCharacterEncoding("UTF-8"); response.setHeader("Content-Disposition", "attachment;filename=" + fileName); return response.getOutputStream(); }
實體注解:
import com.alibaba.excel.annotation.ExcelProperty; import com.fasterxml.jackson.annotation.JsonFormat; import lombok.Data; import java.util.Date; @Data public class ChargingPileVO { /** * 訂單號 */ @ExcelProperty(value = "訂單編號",index = 0) private String orderCode; /** * 聯(lián)系人 */ @ExcelProperty(value = "聯(lián)系人",index = 1) private String userName; /** * 聯(lián)系號碼 */ @ExcelProperty(value = "聯(lián)系電話",index = 2) private String phone; /** * 省份 */ @ExcelProperty(value = "省份",index = 3) private String province; /** * 城市 */ @ExcelProperty(value = "城市",index = 4) private String city; /** * 地區(qū) */ @ExcelProperty(value = "地區(qū)",index = 5) private String district; /** * 地區(qū) */ @ExcelProperty(value = "安裝詳細地址",index = 6) private String contactAddress; /** * 地區(qū) */ @ExcelProperty(value = "派單供應商",index = 7) private String operatorId; /** * 地區(qū) */ @ExcelProperty(value = "訂單創(chuàng)建時間",index = 8) @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8") private Date createTimes; /** * 地區(qū) */ @ExcelProperty(value = "安裝完成時間",index = 9) @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8") private Date installEndTime; /** * 地區(qū) */ @ExcelProperty(value = "樁類型",index = 10) private String pileType; /** * 地區(qū) */ @ExcelProperty(value = "狀態(tài)",index = 11) private String orderStatus; }
4,前端導出
bootstrap導出
showExport: true,開啟 自動可以支持多種格式導出
showExport: true, exportDataType: 'all', exportTypes:[ 'csv', 'txt', 'sql', 'doc', 'excel'], //導出文件類型 exportOptions:{ ignoreColumn: [0], fileName: '工人借支', },
function load() { $('#exampleTable') .bootstrapTable( { method: 'get', // 服務器數(shù)據(jù)的請求方式 get or post url: prefix + "/list", // 服務器數(shù)據(jù)的加載地址 showRefresh : true, showToggle : true, showColumns : true, iconSize: 'outline', toolbar: '#exampleToolbar', striped: true, // 設(shè)置為true會有隔行變色效果 dataType: "json", // 服務器返回的數(shù)據(jù)類型 pagination: true, // queryParamsType : "limit", // //設(shè)置為limit則會發(fā)送符合RESTFull格式的參數(shù) singleSelect: false, // 設(shè)置為true將禁止多選 // contentType : "application/x-www-form-urlencoded", // //發(fā)送到服務器的數(shù)據(jù)編碼類型 pageSize: 10, // 如果設(shè)置了分頁,每頁數(shù)據(jù)條數(shù) pageNumber: 1, // 如果設(shè)置了分布,首頁頁碼 // search : true, // 是否顯示搜索框 sidePagination: "server", // 設(shè)置在哪里進行分頁,可選值為"client" 或者 // showFooter: true, //開啟底部 showExport: true, //showFooter: true, //開啟底部 /* showExport: true, exportDataType: 'all', exportTypes:[ 'csv', 'txt', 'sql', 'doc', 'excel'], //導出文件類型 exportOptions:{ ignoreColumn: [0], fileName: '工人借支', },*/ queryParams: function (params) { return { // 說明:傳入后臺的參數(shù)包括offset開始索引,limit步長,sort排序列,order:desc或者,以及所有列的鍵值對 limit: params.limit, offset: params.offset, davacename: $('#searchName').val().replace(/(^\s*)|(\s*$)/g, ""), years: years, proparentId: proparentId, }; }, // //請求服務器數(shù)據(jù)時,你可以通過重寫參數(shù)的方式添加一些額外的參數(shù),例如 toolbar 中的參數(shù) 如果 // queryParamsType = 'limit' ,返回參數(shù)必須包含 // limit, offset, search, sort, order 否則, 需要包含: // pageSize, pageNumber, searchText, sortName, // sortOrder. // 返回false將會終止請求 columns: [ { field: 'id1', checkbox: true, align: 'left'/*, footerFormatter: function (value) { return "合計"; }*/ }, { field: 'id', title: '編號', align: 'center', formatter:function(value,row,index){ //return index+1; //序號正序排序從1開始 var pageSize=$('#exampleTable').bootstrapTable('getOptions').pageSize;//通過表的#id 可以得到每頁多少條 var pageNumber=$('#exampleTable').bootstrapTable('getOptions').pageNumber;//通過表的#id 可以得到當前第幾頁 return pageSize * (pageNumber - 1) + index + 1; //返回每條的序號: 每頁條數(shù) * (當前頁 - 1 )+ 序號 }, }, { field: 'davacename', title: '借支名稱', align: 'center', }, { field: 'years', title: '年份', align: 'center', }, { field: 'advacedate', title: '添加時間', align: 'center', }, { field: 'sumadvance', title: '借支總金額', align: 'left', formatter: function (value, row, index) { if (row.davaceprice != undefined && row.davaceprice != "") { return '<span class="label label-success' + '">' + row.davaceprice + ' </span>'; } }/*, footerFormatter: function (value) { var count = 0; for (var i in value) { if (value[i].davaceprice != null) { count += value[i].davaceprice; } } return '<span class="label label-danger' + '">' + count.toFixed(2) + ' </span>'; }*/ }, { field: 'worknote', title: '備注', align: 'center', }, { field: 'typename', title: '分類', align: 'center', formatter: function (value, row, index) { return '<span class="label label-danger' + '">' + row.typename + ' </span>'; } }, { field: 'id2', title: '操作', align: 'center', formatter: function (value, row, index) { var e = '<a class="btn btn-primary btn-sm ' + s_edit_h + '" href="#" mce_href="#" title="編輯" onclick="edit(\'' + row.id + '\')"><i class="fa fa-edit"></i></a> '; var d = '<a class="btn btn-warning btn-sm ' + s_remove_h + '" href="#" title="刪除" mce_href="#" onclick="remove(\'' + row.id + '\')"><i class="fa fa-remove"></i></a> '; return e + d; }, }], onLoadSuccess: function (data) { //加載成功時執(zhí)行 var sum_1 = 0; for (var o in data.rows) { var money1=(data.rows[o].davaceprice==null ||data.rows[o].davaceprice==undefined)? 0:data.rows[o].davaceprice; sum_1 = parseFloat(sum_1) + parseFloat(money1); } //設(shè)計我自己的統(tǒng)計html代碼,改成gird形式!不怕寬度不夠帶來麻煩! var myfooter = "<div id='total'> <div class='col-12 text-center ' >" + "合計:" + sum_1.toFixed(2)+ "" + "</div></div>"; if (!$("div.fixed-table-footer").text()) //判斷是不是給隱藏了,在手機模式下style是style="display: none;"同時text是空 { $("div.fixed-table-footer").removeAttr("style"); //取消隱藏 $("div.fixed-table-footer").attr("style", "word-break:break-all;height: auto"); } //把自己的html寫到div.fixed-table-footer里面 $("div.fixed-table-footer").html(myfooter); }, onLoadError: function () { //加載失敗時執(zhí)行 layer.msg("加載數(shù)據(jù)失敗", {time: 1500, icon: 2}); } }); }
采用easyexcel 方式導出方式比較簡單,直接用,通過注解方式實現(xiàn)導出。
至于導出特別大的數(shù)據(jù)量其實程序本身都是有性能瓶頸的,因為幾百萬的數(shù)據(jù)直接內(nèi)存溢出了,所以對于大數(shù)據(jù)量的導出,可以采用異步下載,異步上傳,通過下載中心去導出是最好的。
一件事不管做的怎么樣,好與壞至少你都在做,把事情做到精細化那么你就是專家。
總結(jié)
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