Java导出Excel直接可用Demo

亦凉 2022-04-24 06:02 222阅读 0赞

## Excel工具类： ##

import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    import javax.servlet.http.HttpServletResponse;
    import org.apache.poi.hssf.usermodel.HSSFCell;
    import org.apache.poi.hssf.usermodel.HSSFCellStyle;
    import org.apache.poi.hssf.usermodel.HSSFFont;
    import org.apache.poi.hssf.usermodel.HSSFRichTextString;
    import org.apache.poi.hssf.usermodel.HSSFRow;
    import org.apache.poi.hssf.usermodel.HSSFSheet;
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    import org.apache.poi.hssf.util.CellRangeAddress;
    import org.apache.poi.hssf.util.HSSFColor;
    import org.apache.poi.ss.usermodel.IndexedColors;
    
    /**
     * 导出Excel公共方法
     * @version 1.0
     *
     * @author wangjun
     *
     */
    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[]>();
    
        HttpServletResponse  response;
    
        //构造方法，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(HSSFWorkbook workbook,HSSFSheet sheet,int x) throws Exception{
            try{
    
                // 产生表格标题行
                HSSFRow rowm = sheet.createRow(0);
                HSSFCell cellTiltle = rowm.createCell(0);
    
                rowm.setHeight((short) (25 * 35)); //设置高度
    
                //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
                HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
                HSSFCellStyle style = this.getStyle(workbook);                    //单元格样式对象
    
                sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, (rowName.length-1)));
                cellTiltle.setCellStyle(columnTopStyle);
                cellTiltle.setCellValue(title);
    
                // 定义所需列数
                int columnNum = rowName.length;
                HSSFRow rowRowName = sheet.createRow(1);                // 在索引2的位置创建行(最顶端的行开始的第二行)
    
                rowRowName.setHeight((short) (25 * 25)); //设置高度
    
                // 将列头设置到sheet的单元格中
                for(int n=0;n<columnNum;n++){
                    HSSFCell  cellRowName = rowRowName.createCell(n);                //创建列头对应个数的单元格
                    cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);                //设置列头单元格的数据类型
                    HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                    cellRowName.setCellValue(text);                                    //设置列头单元格的值
                    cellRowName.setCellStyle(columnTopStyle);                        //设置列头单元格样式
                }
    
                //将查询出的数据设置到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+2);//创建所需的行数
    
                    row.setHeight((short) (25 * 20)); //设置高度
    
                    for(int j=0; j<obj.length; j++){
                        HSSFCell  cell = null;   //设置单元格的数据类型
                        if(j == 0){
                            cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC);
                            cell.setCellValue(i+1);
                        }else{
                            cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);
                            if(!"".equals(obj[j]) && obj[j] != null){
                                cell.setCellValue(obj[j].toString());                        //设置单元格的值
                            }
                        }
                        cell.setCellStyle(style);                                    //设置单元格样式
                    }
                }
                //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;
                        //当前行未被使用过
                        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() == HSSFCell.CELL_TYPE_STRING) {
                                int length = currentCell.getStringCellValue().getBytes().length;
                                if (columnWidth < length) {
                                    columnWidth = length;
                                }
                            }
                        }
                    }
                    if(colNum == 0){
                        sheet.setColumnWidth(colNum, (columnWidth-2) * 128);
                    }else{
                        sheet.setColumnWidth(colNum, (columnWidth+4) * 256);
                    }
                }
    
                if(workbook !=null&&x==1){
                    try
                    {
    //                    String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
    //                    String headStr = "attachment; filename=\"" + fileName + "\"";
    //                    response = getResponse();
    //                    response.setContentType("APPLICATION/OCTET-STREAM");
    //                    response.setHeader("Content-Disposition", headStr);
    //                    OutputStream out = response.getOutputStream();
    //                    workbook.write(out);
                        FileOutputStream out = new FileOutputStream("/Users/wangjun/temp/" + new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()).toString() +".xls");
                        workbook.write(out);
                        out.close();
                    }
                    catch (IOException e)
                    {
                        e.printStackTrace();
                    }
                }
    
            }catch(Exception e){
                e.printStackTrace();
            }
    
        }
    
        /*
         * 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.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
            //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(HSSFCellStyle.BORDER_THIN);
            //设置底边框颜色;
            style.setBottomBorderColor(HSSFColor.BLACK.index);
            //设置左边框;
            style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            //设置左边框颜色;
            style.setLeftBorderColor(HSSFColor.BLACK.index);
            //设置右边框;
            style.setBorderRight(HSSFCellStyle.BORDER_THIN);
            //设置右边框颜色;
            style.setRightBorderColor(HSSFColor.BLACK.index);
            //设置顶边框;
            style.setBorderTop(HSSFCellStyle.BORDER_THIN);
            //设置顶边框颜色;
            style.setTopBorderColor(HSSFColor.BLACK.index);
            //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(HSSFCellStyle.ALIGN_CENTER);
            //设置垂直对齐的样式为居中对齐;
            style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
    
            //设置单元格背景颜色
            style.setFillForegroundColor(IndexedColors.PALE_BLUE.getIndex());
            style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
    
            return style;
    
        }
    
        /*
         * 列数据信息单元格样式
         */
        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.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
            //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(HSSFCellStyle.BORDER_THIN);
            //设置底边框颜色;
            style.setBottomBorderColor(HSSFColor.BLACK.index);
            //设置左边框;
            style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            //设置左边框颜色;
            style.setLeftBorderColor(HSSFColor.BLACK.index);
            //设置右边框;
            style.setBorderRight(HSSFCellStyle.BORDER_THIN);
            //设置右边框颜色;
            style.setRightBorderColor(HSSFColor.BLACK.index);
            //设置顶边框;
            style.setBorderTop(HSSFCellStyle.BORDER_THIN);
            //设置顶边框颜色;
            style.setTopBorderColor(HSSFColor.BLACK.index);
            //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(HSSFCellStyle.ALIGN_CENTER);
            //设置垂直对齐的样式为居中对齐;
            style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
    
            return style;
        }
    }

ExcelTest测试类：

import org.apache.poi.hssf.usermodel.HSSFSheet;
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.HashMap;
    import java.util.List;
    
    public class TestExcel {
    
        public static void main(String[] args) throws Exception {
            HSSFWorkbook workbook = new HSSFWorkbook();                        // 创建工作簿对象
            String title = "武则天登基大典演讲稿";
            for (int x=0;x<2;x++) {
                HSSFSheet sheet = workbook.createSheet(title+x);                     // 创建工作表
                HashMap<String, Object> dataMap = new HashMap<String, Object>();
                List<HashMap<String, Object>> listMap = new ArrayList<HashMap<String, Object>>();
                for (int i = 0; i < 30; i++) {
                    dataMap.put("datetime", new Date());
                    dataMap.put("person", "武则天"+i);
                    dataMap.put("type", "文本");
                    dataMap.put("content", "今天朕登基！今天朕登基！今天朕登基！今天朕登基！今天朕登基！今天朕登基！");
                    listMap.add(dataMap);
                }
    
                String[] rowsName = new String[]{"序号", "时间", "发言人", "类型", "消息"};
                List<Object[]> dataList = new ArrayList<Object[]>();
                Object[] objs = null;
                for (int i = 0; i < listMap.size(); i++) {
                    HashMap<String, Object> data = listMap.get(i);
                    objs = new Object[rowsName.length];
                    objs[0] = i;
                    objs[1] = data.get("datetime");
                    objs[2] = data.get("person");
                    objs[3] = data.get("type");
                    objs[4] = data.get("content");
                    dataList.add(objs);
                }
    
                ExportExcel ex = new ExportExcel(title, rowsName, dataList);
                ex.export(workbook,sheet,x);
            }
        }
    }