JAVA導出excel方法

JAVA導出excel方法

ExcelUtil導出Excel文檔工具類

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.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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.DataFormat;
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;

/**
 * 導出Excel文檔工具類
 * [@author] ghs
 * [@date] 2017-5-8
 * */
public class ExcelUtil {

     /**
     * 創建excel文檔，
     * [@param] list 數據
     * @param keys list中map的key數組集合
     * @param columnNames excel的列名
     * */
    public static Workbook createWorkBook(List<Map<String, Object>> list,String []keys,String columnNames[]) {
        // 創建excel工作簿
        Workbook wb = new HSSFWorkbook();
        // 創建第一個sheet（頁），並命名
        Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString());
        // 手動設置列寬。第一個參數表示要爲第幾列設；，第二個參數表示列的寬度，n爲列高的像素數。
        for(int i=0;i<keys.length;i++){
            sheet.setColumnWidth((short) i, (short) (35.7 * 150));
        }

        // 創建第一行
        Row row = sheet.createRow((short) 0);

        // 創建兩種單元格格式
        CellStyle cs = wb.createCellStyle();
        CellStyle cs2 = wb.createCellStyle();
        DataFormat format = wb.createDataFormat();

        // 創建兩種字體
        Font f = wb.createFont();
        Font f2 = wb.createFont();

        // 創建第一種字體樣式（用於列名）
        f.setFontHeightInPoints((short) 10);
        f.setColor(IndexedColors.BLACK.getIndex());
        f.setBoldweight(Font.BOLDWEIGHT_BOLD);

        // 創建第二種字體樣式（用於值）
        f2.setFontHeightInPoints((short) 10);
        f2.setColor(IndexedColors.BLACK.getIndex());

        // 設置第一種單元格的樣式（用於列名）
        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);

        // 設置第二種單元格的樣式（用於值）
        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);
        cs2.setDataFormat(format.getFormat("yyyy年MM月dd日"));
        //設置列名
        for(int i=0;i<columnNames.length;i++){
            Cell cell = row.createCell(i);
            cell.setCellValue(columnNames[i]);
            cell.setCellStyle(cs);
        }
        //設置每行每列的值
        for (short i = 1; i < list.size(); i++) {
            // Row 行,Cell 方格 , Row 和 Cell 都是從0開始計數的
            // 創建一行，在頁sheet上
            Row row1 = sheet.createRow((short) i);
            // 在row行上創建一個方格
            for(short j=0;j<keys.length;j++){
                Cell cell = row1.createCell(j);
                Object value = list.get(i).get(keys[j]);
                if(value instanceof Date){
                    Date date = (Date) value;
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                    cell.setCellValue(value == null?" ": sdf.format(date));
                }
                else{
                    cell.setCellValue(value == null?" ": value.toString());
                }
                cell.setCellStyle(cs2);
            }
        }
        return wb;
    }

    public static void excleExport(HttpServletRequest request,HttpServletResponse response,
            ByteArrayOutputStream os,String fileName) throws IOException{
         byte[] content = os.toByteArray();
         InputStream is = new ByteArrayInputStream(content);
         // 設置response參數，可以打開下載頁面
         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();
         }
    }


}

serviceImpl類業務處理

//導出並下載到excel
    @Override
    public String downloadExcel(HttpServletRequest request,
            HttpServletResponse response,BusinessVo businessVo) throws IOException{
        String fileName="excel文件";
        Map<String, Object> map = commonService1.beansToMap(businessVo);
        //填充projects數據
        //獲取所需數據
        List<BusinessVo> projects=businessdao.getBusRank(map);
        List<Map<String,Object>> list=createExcelRecord(projects);//定義需要導出的excel的數據
        String columnNames[]={"業務ID","業務名稱","平均處理時長","團隊優秀處理時長"};//列名
        String keys[]    =     {"busId","busName","handTime","minHandTime"};//map中的key
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ExcelUtil.createWorkBook(list,keys,columnNames).write(os);
        } catch (IOException e) {
            e.printStackTrace();
        }
        ExcelUtil.excleExport(request,response,os,fileName);
        return null;

    }

    //定義需要導出的excel的數據
    private List<Map<String, Object>> createExcelRecord(List<BusinessVo> businessVo) {
        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);
        BusinessVo business=null;
        for (int j = 0; j < businessVo.size(); j++) {
            business=businessVo.get(j);
            Map<String, Object> mapValue = new HashMap<String, Object>();
            mapValue.put("busId", business.getBusId());
            mapValue.put("busName", business.getBusName());
            mapValue.put("handTime", business.getHandTime());
            mapValue.put("minHandTime", business.getMinHandTime());
            listmap.add(mapValue);
        }
        return listmap;
    }