java导出文件xlsx变成xls excel java导出

转载

mob64ca13f40f3d 2024-06-17 05:56:08

文章标签 java导出文件xlsx变成xls java List Pair apache 文章分类 Java 后端开发

老样子贴入依赖：

<!-- apache -->
 <dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
  </dependency>
  <dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
  </dependency>

如果缺少依赖，come

需要特别注意的一点：

import org.apache.commons.lang3.tuple.Pair;

不要引错包:

java导出文件xlsx变成xls excel java导出_Pair

下面贴入工具类：

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;

import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

public class ExportExcel {

    // 显示的导出表的标题
    private String title;
    // 导出表的列名
    private String[] rowName;
    private List<Object[]> dataList = new ArrayList<Object[]>();

    // 构造函数，传入要导出的数据
    public ExportExcel(String title, String[] rowName, List<Object[]> dataList) {
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
    }

    // 导出数据
    public void export(OutputStream out) throws Exception {
        try {
            HSSFWorkbook workbook = new HSSFWorkbook();
            HSSFSheet sheet = workbook.createSheet(title);

            // 产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTitle = rowm.createCell(0);

            //sheet样式定义【】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);
            HSSFCellStyle style = this.getStyle(workbook);
            sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
            cellTitle.setCellStyle(columnTopStyle);
            cellTitle.setCellValue(title);

            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(2);

            // 将列头设置到sheet的单元格中
            for (int n = 0; n < columnNum; n++) {
                HSSFCell cellRowName = rowRowName.createCell(n);
                cellRowName.setCellType(CellType.STRING);
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);
                cellRowName.setCellStyle(columnTopStyle);

            }
            // 将查询到的数据设置到sheet对应的单元格中
            for (int i = 0; i < dataList.size(); i++) {
                Object[] obj = dataList.get(i);// 遍历每个对象
                HSSFRow row = sheet.createRow(i + 3);// 创建所需的行数

                for (int j = 0; j < obj.length; j++) {
                    HSSFCell cell = null;
                    if (j == 0) {
                        cell = row.createCell(j, CellType.NUMERIC);
                        cell.setCellValue(i + 1);
                    } else {
                        cell = row.createCell(j, CellType.STRING);
                        if (!"".equals(obj[j]) && obj[j] != null) {
                            cell.setCellValue(obj[j].toString());
                        }else{
                            cell.setCellValue("");
                        }
                    }
                    cell.setCellStyle(style);
                }
            }

            // 让列宽随着导出的列长自动适应
            for (int colNum = 0; colNum < columnNum; colNum++) {
                int columnWidth = sheet.getColumnWidth(colNum) / 256;
                for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                    HSSFRow currentRow;
                    if (sheet.getRow(rowNum) == null) {
                        currentRow = sheet.createRow(rowNum);
                    } else {
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
                        HSSFCell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == CellType.STRING) {
                            int length = currentCell.getStringCellValue().getBytes().length;
                            if (columnWidth < length) {
                                columnWidth = length;
                            }
                        }
                    }
                }
                if (colNum == 0) {
                    sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
                } else {
                    sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
                }
            }
            if (workbook != null) {
                try {
                    workbook.write(out);
                    out.flush();
                    out.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        } catch (Exception e) {

        }
    }

    /**
     * 列头单元格样式
     **/
    public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();

        // 设置字体大小
        font.setFontHeightInPoints((short) 11);
        // 字体加粗
        font.setBold(true);
        // 设置字体名字
        font.setFontName("Courier New");
        // 设置样式
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置低边框
        style.setBorderBottom(BorderStyle.THIN);
        // 设置低边框颜色
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
        // 设置右边框
        style.setBorderRight(BorderStyle.THIN);
        // 设置顶边框
        style.setTopBorderColor(IndexedColors.BLACK.getIndex());
        // 设置顶边框颜色
        style.setTopBorderColor(IndexedColors.BLACK.getIndex());
        // 在样式中应用设置的字体
        style.setFont(font);
        // 设置自动换行
        style.setWrapText(false);
        // 设置水平对齐的样式为居中对齐；
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        return style;

    }

    public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();
        // 设置字体大小
        font.setFontHeightInPoints((short) 10);
        // 字体加粗
        font.setBold(true);
        // 设置字体名字
        font.setFontName("Courier New");
        // 设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置底边框;
        style.setBorderBottom(BorderStyle.THIN);
        // 设置底边框颜色;
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
        // 设置左边框;
        style.setBorderLeft(BorderStyle.THIN);
        // 设置左边框颜色;
        style.setLeftBorderColor(IndexedColors.BLACK.getIndex());
        // 设置右边框;
        style.setBorderRight(BorderStyle.THIN);
        // 设置右边框颜色;
        style.setRightBorderColor(IndexedColors.BLACK.getIndex());
        // 设置顶边框;
        style.setBorderTop(BorderStyle.THIN);
        // 设置顶边框颜色;
        style.setTopBorderColor(IndexedColors.BLACK.getIndex());
        // 在样式用应用设置的字体;
        style.setFont(font);
        // 设置自动换行;
        style.setWrapText(false);
        // 设置水平对齐的样式为居中对齐;
        style.setAlignment(HorizontalAlignment.CENTER);
        // 设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        return style;
    }
}

import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;

/**
 * @Description:打印异常信息
 */
public class ExceptionUtils {
    /**
     * 功能描述: 获取异常信息
     */
    public static String getCrashMessage(Exception ex) {
        String  errorMsg="";
        Throwable cause = ex.getCause();
        while (cause != null) {
            errorMsg=errorMsg+cause.getMessage();
            cause = cause.getCause();
        }
        return errorMsg;
    }

    /**
     * 功能描述: 打印日志异常信息
     */
    public static String printCrashMessage(Exception ex) {
        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        return writer.toString();
    }
}

项目中具体使用方法：

/**
 * 功能描述:-导出
 */
 @ApiOperation("导出")
 @PostMapping("stockExport")
 public void stockExport(@NotNull(message = "查询条件不能为空") @RequestBody Object obj, HttpServletResponse response) throws Exception {
     // 分页
      IPage<InvStockStatistics> stockIPage = new Page<>(1,10);
      Pair<String[], List<Object[]>> listPair = invStockStatisticsService.queryListExport(obj, invStockStatistics);
      //给文件命名
      String fileName = "InvStock_" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
      exportExcel(fileName, "*****查询", listPair, response);
 }

import org.apache.commons.lang3.tuple.Pair;
import java.io.OutputStream;

protected void exportExcel(String fileName, String title, Pair<String[], List<Object[]>> listPair,
  HttpServletResponse response) throws Exception {
    if (listPair != null) {
        //告诉浏览器数据格式，将头和数据传到前台
        String headStr = "attachment; filename=" + fileName;
        response.setContentType("APPLICATION/OCTET-STREAM");
        response.setHeader("Content-Disposition", headStr);
        OutputStream out = response.getOutputStream();
        ExportExcel exportExcel = new ExportExcel(title, listPair.getKey(), listPair.getValue());
        exportExcel.export(out);
    }
}

import org.apache.commons.lang3.tuple.Pair;

@Override
public Pair<String[], List<Object[]>> queryListExport(IPage<Object> page,Object obj) {
   
   Pair<String[], List<Object[]>> resultPair;
   // 查询
   List<Object> list= userMapper.selectInvPage(page,obj);

   String[] invStockName = {"序号", "姓名", "性别", "年龄"};
   List<Object[]> invList = new ArrayList<Object[]>();
   Object[] objs = null;
   for (int i = 0; i < list.size(); i++) {
       InvStockStatistics regRum = list.get(i);
       objs = new Object[invStockName.length];
       objs[0] = i;
       objs[1] = regRum.obj();
       objs[2] = regRum.obj();
       objs[3] = regRum.obj();
       objs[4] = regRum.obj();
       invList.add(objs);
   }
   resultPair = Pair.of(invStockName, invList);
   return resultPair;
}

跟前一个对比，其实各有好坏（第一篇java Excel 导出）第一个个人认为比较方便，只要不是太麻烦的都可以，且直接返回路径, 而第二个就很明显了，返回的是流。再次提醒，不要引错包，很重要。

不喜欢太多废话，分享结束。

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