html

<a href="/visitor/export">导出excel</a>

controller

    /*** excel 导出*/@RequestMapping(value ="/export")public ModelAndView exportExcel(HttpServletRequest request, HttpServletResponse response){try {// 查出用户数据List<Map<String, Object>> vistors = visitorService.selectMaps(null);String title ="访客管理";String[] rowsName=new String[]{"ID","园区id","访客姓名","访客电话","预约时间"};List<Object[]>  dataList = new ArrayList<Object[]>();Object[] objs = null;for (int i = 0; i < vistors.size(); i++) {Map<String, Object> vistor = vistors.get(i);objs = new Object[rowsName.length];objs[0] = vistor.get("id");objs[1] = vistor.get("parkId");objs[2] = vistor.get("visitorName");objs[3] = vistor.get("visitorMobile");objs[4] = vistor.get("appointTime");dataList.add(objs);}//ExportExcelUtils ex =new ExportExcelUtils(title, rowsName, dataList,response);ex.exportData();} catch (Exception e) {e.printStackTrace();}return null;}

utils

package com.stylefeng.guns.modular.utils;import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
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.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;public class ExportExcelUtils {private String title; // 导出表格的表名private String[] rowName;// 导出表格的列名private List<Object[]>  dataList = new ArrayList<Object[]>(); // 对象数组的List集合private HttpServletResponse  response;// 传入要导入的数据public ExportExcelUtils(String title,String[] rowName,List<Object[]>  dataList,HttpServletResponse  response){this.title=title;this.rowName=rowName;this.dataList=dataList;this.response = response;}// 导出数据public void exportData(){try {HSSFWorkbook workbook =new HSSFWorkbook(); // 创建一个excel对象HSSFSheet sheet =workbook.createSheet(title); // 创建表格// 产生表格标题行HSSFRow rowm  =sheet.createRow(0);  // 行HSSFCell cellTiltle =rowm.createCell(0);  // 单元格// sheet样式定义HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook); // 头样式HSSFCellStyle style = this.getStyle(workbook);  // 单元格样式/*** 参数说明* 从0开始   第一行 第一列 都是从角标0开始* 行 列 行列    (0,0,0,5)  合并第一行 第一列  到第一行 第六列* 起始行，起始列，结束行，结束列** new Region()  这个方法使过时的*/// 合并第一行的所有列sheet.addMergedRegion(new CellRangeAddress(0, (short) 0, 0, (short) (rowName.length-1)));cellTiltle.setCellStyle(columnTopStyle);cellTiltle.setCellValue(title);int columnNum = rowName.length;  // 表格列的长度HSSFRow rowRowName = sheet.createRow(1);  // 在第二行创建行HSSFCellStyle cells =workbook.createCellStyle();cells.setBottomBorderColor(HSSFColor.BLACK.index);rowRowName.setRowStyle(cells);// 循环 将列名放进去for (int i = 0; i < columnNum; i++) {HSSFCell  cellRowName = rowRowName.createCell((int)i);cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); // 单元格类型HSSFRichTextString text = new HSSFRichTextString(rowName[i]);  // 得到列的值cellRowName.setCellValue(text); // 设置列的值cellRowName.setCellStyle(columnTopStyle); // 样式}// 将查询到的数据设置到对应的单元格中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for (int j = 0; j < obj.length; j++) {HSSFCell  cell = null;   //设置单元格的数据类型if(j==0){// 第一列设置为序号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}else{cell.setCellValue("  ");}}cell.setCellStyle(style); // 样式}}//  让列宽随着导出的列长自动适应sheet.autoSizeColumn((short)0); //调整第一列宽度sheet.autoSizeColumn((short)1); //调整第二列宽度sheet.autoSizeColumn((short)2); //调整第三列宽度sheet.autoSizeColumn((short)3); //调整第四列宽度sheet.autoSizeColumn((short)4); //调整第五列宽度sheet.autoSizeColumn((short)5); //调整第六列宽度if(workbook !=null){try{// excel 表文件名String fileName = title + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";String fileName11 = URLEncoder.encode(fileName,"UTF-8");String headStr = "attachment; filename=\"" + fileName11 + "\"";response.setContentType("APPLICATION/OCTET-STREAM");response.setHeader("Content-Disposition", headStr);OutputStream out = response.getOutputStream();workbook.write(out);out.flush();out.close();}catch (IOException e){e.printStackTrace();}}}catch(Exception e){e.printStackTrace();}}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);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.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;}
}

参考网站 : https://blog.csdn.net/qq_23191147/article/details/50588581