Java导出完整版模板（export）

1.在pom引入jra包

    org.apache.poi
    poi-ooxml
    3.15
    
        
            stax
            stax-api
        
    

2.导出模板(util文件)

import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.xssf.streaming.SXSSFCell;
import org.apache.poi.xssf.streaming.SXSSFRow;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;

@Slf4j
public class ExportExcelStandard {
    private String sheetName; // 导出表格的表名
    private String[] rowName;// 导出表格的列名
    private List> dataList = new ArrayList<>(); // 对象数组的List集合
    private HttpServletResponse response;
    private HttpServletRequest request;
    private String fileName;
    private String filePath;

    public ExportExcelStandard(String sheetName, String[] rowName, List> dataList, HttpServletRequest request, HttpServletResponse response) {
        this.rowName = rowName;
        this.dataList = dataList;
        this.response = response;
        this.request = request;
        this.sheetName = sheetName;
    }

    public ExportExcelStandard(String sheetName, String fileName, String[] rowName, List> dataList, HttpServletRequest request, HttpServletResponse response) {
        this.rowName = rowName;
        this.dataList = dataList;
        this.fileName = fileName;
        this.response = response;
        this.request = request;
        this.sheetName = sheetName;
    }

    public ExportExcelStandard(String sheetName, String[] rowName, List> dataList, String fileName, String filePath) {
        this.rowName = rowName;
        this.dataList = dataList;
        this.sheetName = sheetName;
        this.fileName = fileName;
        this.filePath = filePath;
    }

    public ExportExcelStandard() {
    }
    
    // 导出数据
    public void exportData() throws Exception {
        log.info("excel导出创建work");
        SXSSFWorkbook workbook = new SXSSFWorkbook();//声明一个工作薄 Excel 2007 OOXML (.xlsx)格式
        SXSSFSheet sheet = workbook.createSheet(sheetName); // 创建表格
        for (int i = 1; i < rowName.length; i++) { //根据列名设置每一列的宽度
            int length = rowName[i].toString().length();
            sheet.setColumnWidth(i, 2 * (length + 1) * 256);
        }
        // sheet样式定义
        CellStyle columnTopStyle = ExportExcelUtil.getColumnTopStyle(workbook, 14); // 头样式
        CellStyle columnStyle = ExportExcelUtil.getColumnStyle(workbook, 12); // 标题样式
        CellStyle style = ExportExcelUtil.getStyle(workbook, 11);  // 单元格样式
        CellStyle styleError = ExportExcelUtil.getStyleError(workbook, 11);  // 单元格样式
        // 产生第一行（列名）
        int columnNum = rowName.length;  // 表格列的长度
        SXSSFRow rowRowName = sheet.createRow(0);  // 在第二行创建行
        rowRowName.setHeightInPoints(21f);
        CellStyle cells = workbook.createCellStyle();
        cells.setBottomBorderColor(HSSFColor.BLACK.index);
        rowRowName.setRowStyle(cells);
        for (int i = 0; i < columnNum; i++) {
            SXSSFCell cellRowName = rowRowName.createCell(i);
            cellRowName.setCellType(SXSSFCell.CELL_TYPE_STRING); // 单元格类型
            XSSFRichTextString text = new XSSFRichTextString(rowName[i]);  // 得到列的值
            cellRowName.setCellValue(text); // 设置列的值
            cellRowName.setCellStyle(columnStyle); // 样式
        }
        // 产生其它行（将数据列表设置到对应的单元格中）注意：默认添加了第一列的序号，如果不要可以注释掉
        for (int i = 0; i < dataList.size(); i++) {
            LinkedHashMap linkedHashMapData = dataList.get(i);//遍历每个对象
            SXSSFRow row = sheet.createRow(i + 1);//创建所需的行数
            row.setHeightInPoints(17.25f);
            int j = 0;
            Iterator iter = linkedHashMapData.keySet().iterator();
            while (iter.hasNext()) {
                SXSSFCell cell = null;   //设置单元格的数据类型
                cell = row.createCell(j, SXSSFCell.CELL_TYPE_STRING);
                Object key = iter.next();
                Object val = linkedHashMapData.get(key);
                Boolean isNum = false;//val是否为数值型
                Boolean isInteger=false;//val是否为整数
                Boolean isPercent=false;//val是否为百分数
                if (val != null || "".equals(val)) {
                    //判断val是否为数值型
                    isNum = val.toString().matches("^(-?\\d+)(\\.\\d+)?$");
                    //判断val是否为整数（小数部分是否为0）
                    isInteger=val.toString().matches("^[-\\+]?[\\d]*$");
                    //判断val是否为百分数（是否包含“%”）
                    isPercent=val.toString().contains("%");
                }
                //如果单元格内容是数值类型，涉及到金钱（金额、本、利），则设置cell的类型为数值型，设置val的类型为数值类型
                if (isNum && !isPercent) {
                    HSSFDataFormat.getBuiltinFormat("0.00");
                    if (isInteger) {
                        style.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,#0"));//数据格式只显示整数
                    }else{
                        style.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,##0.00"));//保留两位小数点
                    }
                    // 设置单元格内容为double类型
                    cell.setCellValue(Double.parseDouble(val.toString()));
                } else if (null != val && !"".equals(val)){
                    // 设置单元格内容为字符型
                    cell.setCellValue(val.toString());
                }else{
                    cell.setCellValue("");
                }
                // 设置单元格格式
                cell.setCellStyle(style);
                j++;
            }
        }
        //  让列宽随着导出的列长自动适应，但是对中文支持不是很好  也可能在linux（无图形环境的操作系统）下报错，报错再说
        sheet.trackAllColumnsForAutoSizing();
        for (int i = 0; i < columnNum; i++) {
            sheet.autoSizeColumn(i);
            //sheet.setColumnWidth(i, sheet.getColumnWidth(i)*2);//适当再宽点
            int colWidth = sheet.getColumnWidth(i)*2;
            if(colWidth<255*256){
                sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);
            }else{
                sheet.setColumnWidth(i,6000 );
            }
        }
        log.info("excel导出生成完成");
        if (workbook != null) {
            // 输出到用户浏览器上
            if (null != filePath) {
                ExportExcelUtil.saveFile(filePath, fileName, workbook);
            } else {
                if (workbook != null) {
                    ExportExcelUtil.responWrite(response, request, workbook,sheetName);
                }
            }
        }
    }
}

3.service

public void exportOutsourcingAuditBills(String billMonth, String companyId,  HttpServletRequest request, HttpServletResponse response) {
    String[] rowName = {"列名1", "列名2", "列名3", "列名4", "列名5", "列名6", "列名7"};
    String SheetName = "表名";
    String billId = mapper.getBillId(billMonth, companyId);
    List> taskStatusList = new ArrayList<>();
    if (null != billId) {
        taskStatusList = beOutbillDescMapper.getOutsourcingAuditBills(billId);// 得到要展示的值
    }
    ExportExcelStandard exportExcel = new ExportExcelStandard(SheetName, rowName, taskStatusList, request, response);// 加载导出文件a
    try {
        exportExcel.exportData();// 调导出的方法
    } catch (Exception e) {
        log.info(e + "");
    }
}

4.controller

@GetMapping("/export/exportFile/exportOutsourcingAuditBills")
public void exportOutsourcingAuditBills(String billMonth,String companyId,HttpServletRequest request, HttpServletResponse response){
    try {
        service.exportOutsourcingAuditBills(billMonth,companyId,request,response);
    } catch (Exception e) {
        log.error("/export/exportFile/exportOutsourcingAuditBills"+e);
    }
}

5.前端调用导出

window.location.href = getApi()+"report/export/exportFile/exportOutsourcingAuditBills?billMonth="+billMonth+"&companyId="+companyId