另外一种excel导出

一、excelUtil工具类

package com.velcro.kms.report.utils;

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

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

/**
 * 导出Excel公共方法
 * @version 1.0
 *
 * @author wangcp
 *
 */
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[]>();
    private static DecimalFormat integerFormat=new DecimalFormat("0");//格式化number,String
    private static SimpleDateFormat timeFormat=new SimpleDateFormat("yyyy-MM-dd");//格式化日期
    private static DecimalFormat decimalFormat=new DecimalFormat("0.00");//格式化数字
    HttpServletResponse response;

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

    /*
     * 导出数据
     * */
    public void export() throws Exception{
        HSSFWorkbook workbook = new HSSFWorkbook();                        // 创建工作簿对象
        try{
            HSSFSheet sheet = workbook.createSheet(title);                     // 创建工作表
            // 产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTiltle = rowm.createCell(0);

            //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, 1, 0, (rowName.length-1)));
            cellTiltle.setCellStyle(columnTopStyle);
            cellTiltle.setCellValue(title);

            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(2);                // 在索引2的位置创建行(最顶端的行开始的第二行)

            // 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+3);//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){
                        cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
                        cell.setCellValue(i+1);
                    }else if(j == 5){
                        cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
                        if(!"".equals(obj[j]) && obj[j] != null){
                            cell.setCellValue(Double.parseDouble(obj[j].toString()));                        //设置单元格的值
                        }
                    }else if(j == 10){
                        cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
                        if(!"".equals(obj[j]) && obj[j] != null){
                            cell.setCellValue(Double.parseDouble(obj[j].toString()));                        //设置单元格的值
                        }
                    }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 = 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) / 200;
                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) * 300);
                }else{
                    /*if(columnWidth<255*256){
                        sheet.setColumnWidth(colNum, columnWidth < 3000 ? 3000 : columnWidth);
                    }else{
                        sheet.setColumnWidth(colNum,6000 );
                    }*/
                    sheet.setColumnWidth(colNum, (columnWidth+4) * 300);
                }
            }

            if(workbook !=null){
                OutputStream out=null;
                try
                {
                    String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
                    String headStr = "attachment; filename=\"" + fileName + "\"";
                    response.setContentType("APPLICATION/OCTET-STREAM");
                    response.setHeader("Content-Disposition", headStr);
                    out = response.getOutputStream();
                    workbook.write(out);
                } catch (IOException e) {
                    e.printStackTrace();
                }finally {
                    try{
                        out.close();
                    }catch (IOException e){
                        e.printStackTrace();
                    }
                }
            }

        }catch(Exception e){
            e.printStackTrace();
        }finally {
            //清理资源
            try {
                workbook.close();
            }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);

          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;

      }

    /**
     * 得到Excel表中的值
     * @param cell
     * @return String
     * @author ZamXie
     */
    public static String getCellString(HSSFCell cell){
        String value=null;
        if(cell==null){
            return value;
        }
        //System.out.println(cell.getCellStyle()+"*******"+cell.getCellStyle().getDataFormatString());
        switch (cell.getCellType()) {
            case HSSFCell.CELL_TYPE_STRING:
                value=cell.getStringCellValue();
                System.out.println(value);
                break;
            case HSSFCell.CELL_TYPE_NUMERIC:
                if("@".equals(cell.getCellStyle().getDataFormatString())){
                    value=integerFormat.format(cell.getNumericCellValue());
                }else if("General".equals(cell.getCellStyle().getDataFormatString())){
                    //System.out.println("-------------cnum= "+cell.getColumnIndex());
                    if(cell.getColumnIndex()==13){
                        BigDecimal bd = new BigDecimal(cell.getNumericCellValue());
                        value= bd.toPlainString();
                        // System.out.println(value);
                        // value = String.valueOf(setScale.toPlainString());
                    }else{
                        value=decimalFormat.format(cell.getNumericCellValue());
                    }
                }else if("0_);[Red]\\(0\\)".equals(cell.getCellStyle().getDataFormatString())){
                    value=integerFormat.format(cell.getNumericCellValue());
                }else if("0.00".equals(cell.getCellStyle().getDataFormatString())||
                        "0".equals(cell.getCellStyle().getDataFormatString())||
                        "0.00_);[Red]\\(0.00\\)".equals(cell.getCellStyle().getDataFormatString())){
                    value=decimalFormat.format(cell.getNumericCellValue());//自定义
                }else{
                    value=timeFormat.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue()));
                }
                break;
            case HSSFCell.CELL_TYPE_BOOLEAN:
                value=cell.getBooleanCellValue()+"";
                break;
            case HSSFCell.CELL_TYPE_BLANK:
                value="";
                break;
            case HSSFCell.CELL_TYPE_FORMULA://解析excel中函数
                FormulaEvaluator evaluator = cell.getSheet().getWorkbook().getCreationHelper().createFormulaEvaluator();
                evaluator.evaluateFormulaCell(cell);
                Cell cell1 = evaluator.evaluateInCell(cell);
                try {
                    value = String.valueOf(cell1.getStringCellValue());
                } catch (IllegalStateException e) {
                    BigDecimal bd = new BigDecimal(cell1.getNumericCellValue());
                    value = String.valueOf(bd.toPlainString());
                }
                break;
            default:
                value=cell.toString();
        }
        return value;
    }

      public static void main(String[] args) {
        /* String title = "鱼蛋";
          String[] rowsName = new String[]{"序号","货物运输批次号","提运单号","状态","录入人","录入时间"};
          List<Object[]>  dataList = new ArrayList<Object[]>();
            Object[] objs = null;
            for (int i = 0; i < manifestIMainList.size(); i++) {
                ManifestIMain man = manifestIMainList.get(i);
                objs = new Object[rowsName.length];
                objs[0] = i;
                objs[1] = man.getTranNo();
                objs[2] = man.getBillNo();
                objs[3] = man.getStatusFlagCnName();
                objs[4] = man.getLoginName();
                SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                String date = df.format(man.getModiDate());
                objs[5] = date;
                dataList.add(objs);
            }
            ExportExcel ex = new ExportExcel(title, rowsName, dataList);
            ex.export();*/
    }
}

二、jsp界面

<button onclick="export1()" value="导出">导出</button>

三、js文件

function export1() {
    // $.ajax({
    //     url: "/kms/knowledgeView/export.do",
    //     type: "POST",
    //     dataType: "json",
    //     success: function (data) {
    //
    //     }
    // });
    // var form=$('<form method="post" action="/kms/knowledgeView/export.do" >/kms/knowledgeView/export.do</form>');
    // console.log(form)
    // form.appendTo('body').submit().remove();
    // return ;

　　//ajax方式请求路径，要想出现下载Excel的弹窗，应该是重新打开一个窗口，而ajax默认不动页面直接将值返回，所以没有提升下载。

    window.location.href="/kms/knowledgeView/export.do";

}

四、comtroller

    @RequestMapping(value = "/kms/knowledgeView/export")
    public void export( HttpServletRequest request,HttpServletResponse response) throws Exception {

        KnowledgeViewModel r = WebUtils.requestToBean(request, KnowledgeViewModel.class);
        //获取表头
        String[] rowsName={"部门","跨部门浏览量","本部门浏览量"};
        List<KnowledgeViewModel> orgList=knowledgeViewService.getOrgList();
        String title = "本年浏览量";
        List<Object[]>  dataList = new ArrayList<Object[]>();
        Object[] objs = null;
        for (int i = 0; i < orgList.size(); i++) {
            KnowledgeViewModel orgs = orgList.get(i);
            objs = new Object[rowsName.length];
            objs[0] = orgs.getOrgName()!=null&& StringUtils.isNotEmpty(orgs.getOrgName()) ? orgs.getOrgName() : "-";
            objs[1] = orgs.getNum();
            objs[2] = orgs.getSumNum();
            dataList.add(objs);
        }
        ExportExcel ex = new ExportExcel(response,title, rowsName, dataList);
        ex.export();
    }

结果界面：