下载

来源：互联网发布：flash mx2004软件下载编辑：程序博客网时间：2024/04/30 04:31

// 01、调用Service获取List<Map<String,String>>
List<Map<String, String>> dataList = new ArrayList<Map<String, String>>();

  // 02、获取标题
  List<String> tmpList = new ArrayList<String>();
  Map<String, String> tmpMap = dataList.get(0);
  Set keySet = tmpMap.keySet();
  Iterator<String> it = keySet.iterator();
  while (it.hasNext()) {
   String tmpKey = it.next();
   String value = tmpMap.get(tmpKey);
   tmpList.add(value);
  }
  String[] columns = (String[]) tmpList.toArray();

  // 03、获取要输出的key数组
  Map<String, String> tmpDataMap = dataList.get(1);
  Set dataKeySet = tmpDataMap.keySet();
  String[] keys = (String[]) dataKeySet.toArray();

加入对应的jar包，包括springmvc,poi的，
spring jar包在此不列举出来，主要是poi包，如下图所示
下载地址：http://download.csdn.net/download/huawei2010_2011_2012/5034041，或者搜poi3.9

在此输入图片描述

实体类：

    public class Project {        private Integer id;        private String name;        private String technology;//所用技术        private String remarks;//备注        //省略setter/getter    }

控制器类：

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import com.entity.Project;import com.util.ExcelUtil;@Controllerpublic class DownloadAct {    @RequestMapping(value="download_project.do")    public String download(HttpServletRequest request,HttpServletResponse response) throws IOException{        String fileName="excel文件";        //填充projects数据        List<Project> projects=createData();        List<Map<String,Object>> list=createExcelRecord(projects);        String columnNames[]={"ID","项目名","销售人","负责人","所用技术","备注"};//列名        String keys[]   =    {"id","name","saler","principal","technology","remarks"};//map中的key        ByteArrayOutputStream os = new ByteArrayOutputStream();        try {            ExcelUtil.createWorkBook(list,keys,columnNames).write(os);        } catch (IOException e) {            e.printStackTrace();        }        byte[] content = os.toByteArray();        InputStream is = new ByteArrayInputStream(content);        // 设置response参数，可以打开下载页面        response.reset();        response.setContentType("application/vnd.ms-excel;charset=utf-8");        response.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xls").getBytes(), "iso-8859-1"));        ServletOutputStream out = response.getOutputStream();        BufferedInputStream bis = null;        BufferedOutputStream bos = null;        try {            bis = new BufferedInputStream(is);            bos = new BufferedOutputStream(out);            byte[] buff = new byte[2048];            int bytesRead;            // Simple read/write loop.            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {                bos.write(buff, 0, bytesRead);            }        } catch (final IOException e) {            throw e;        } finally {            if (bis != null)                bis.close();            if (bos != null)                bos.close();        }        return null;    }    private List<Project> createData() {        // TODO Auto-generated method stub        //自己实现        return null;    }    private List<Map<String, Object>> createExcelRecord(List<Project> projects) {        List<Map<String, Object>> listmap = new ArrayList<Map<String, Object>>();        Map<String, Object> map = new HashMap<String, Object>();        map.put("sheetName", "sheet1");        listmap.add(map);        Project project=null;        for (int j = 0; j < projects.size(); j++) {            project=projects.get(j);            Map<String, Object> mapValue = new HashMap<String, Object>();            mapValue.put("id", project.getId());            mapValue.put("name", project.getName());            mapValue.put("technology", project.getTechnology());            mapValue.put("remarks", project.getRemarks());            listmap.add(mapValue);        }        return listmap;    }}

Excel工具类：

import java.util.List;import java.util.Map;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.CellStyle;import org.apache.poi.ss.usermodel.Font;import org.apache.poi.ss.usermodel.IndexedColors;import org.apache.poi.ss.usermodel.Row;import org.apache.poi.ss.usermodel.Sheet;import org.apache.poi.ss.usermodel.Workbook;/** * 导出Excel文档工具类 * @author 那位先生 * @date 2014-8-6 * */public class ExcelUtil {    /**     * 创建excel文档，     * @param list 数据     * @param keys list中map的key数组集合     * @param columnNames excel的列名     * */    public static Workbook createWorkBook(List<Map<String, Object>> list,String []keys,String columnNames[]) {        // 创建excel工作簿        Workbook wb = new HSSFWorkbook();        // 创建第一个sheet（页），并命名        Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString());        // 手动设置列宽。第一个参数表示要为第几列设；，第二个参数表示列的宽度，n为列高的像素数。        for(int i=0;i<keys.length;i++){            sheet.setColumnWidth((short) i, (short) (35.7 * 150));        }        // 创建第一行        Row row = sheet.createRow((short) 0);        // 创建两种单元格格式        CellStyle cs = wb.createCellStyle();        CellStyle cs2 = wb.createCellStyle();        // 创建两种字体        Font f = wb.createFont();        Font f2 = wb.createFont();        // 创建第一种字体样式（用于列名）        f.setFontHeightInPoints((short) 10);        f.setColor(IndexedColors.BLACK.getIndex());        f.setBoldweight(Font.BOLDWEIGHT_BOLD);        // 创建第二种字体样式（用于值）        f2.setFontHeightInPoints((short) 10);        f2.setColor(IndexedColors.BLACK.getIndex());//      Font f3=wb.createFont();//      f3.setFontHeightInPoints((short) 10);//      f3.setColor(IndexedColors.RED.getIndex());        // 设置第一种单元格的样式（用于列名）        cs.setFont(f);        cs.setBorderLeft(CellStyle.BORDER_THIN);        cs.setBorderRight(CellStyle.BORDER_THIN);        cs.setBorderTop(CellStyle.BORDER_THIN);        cs.setBorderBottom(CellStyle.BORDER_THIN);        cs.setAlignment(CellStyle.ALIGN_CENTER);        // 设置第二种单元格的样式（用于值）        cs2.setFont(f2);        cs2.setBorderLeft(CellStyle.BORDER_THIN);        cs2.setBorderRight(CellStyle.BORDER_THIN);        cs2.setBorderTop(CellStyle.BORDER_THIN);        cs2.setBorderBottom(CellStyle.BORDER_THIN);        cs2.setAlignment(CellStyle.ALIGN_CENTER);        //设置列名        for(int i=0;i<columnNames.length;i++){            Cell cell = row.createCell(i);            cell.setCellValue(columnNames[i]);            cell.setCellStyle(cs);        }        //设置每行每列的值        for (short i = 1; i < list.size(); i++) {            // Row 行,Cell 方格 , Row 和 Cell 都是从0开始计数的            // 创建一行，在页sheet上            Row row1 = sheet.createRow((short) i);            // 在row行上创建一个方格            for(short j=0;j<keys.length;j++){                Cell cell = row1.createCell(j);                cell.setCellValue(list.get(i).get(keys[j]) == null?" ": list.get(i).get(keys[j]).toString());                cell.setCellStyle(cs2);            }        }        return wb;    }}

在jsp页面中添加

<input type="button" value="导出数据" onclick="download()"/>

js中添加

function download(){    var url="download_customer.do";    window.open(url);}

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