Java使用Apache POI 導出excel

時間 2019-11-11

標籤 java 使用 apache poi 導出 excel 欄目 Java 简体版

原文原文鏈接

一、Java工具類代碼：
java

package com.allin.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import javax.servlet.http.HttpServletRequest;
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.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
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.hssf.util.Region;
import org.apache.poi.ss.usermodel.Workbook;
import org.compass.core.util.CollectionUtils;

/**
* 2015-4-29
* DES:POI導出Excel
* author:JiBaoLe
*/
public class ExportToExcelUtil<T> {
   //每次設置導出數量
   public static int NUM=5000;
   public static String title="";

    /**
     * 導出Excel的方法
     * @param title excel中的sheet名稱
     * @param headers 表頭
     * @param result 結果集
     * @param out 輸出流
     * @param pattern 時間格式
     * @throws Exception
     */
    public void exportExcel( String[] headers,String[] columns, List<T> result, OutputStream out,HttpServletRequest request, String pattern) throws Exception{

       File zip = new File(request.getRealPath("/files") + "/" +getFileName() + ".zip");// 壓縮文件

       int n=0;
       if (!CollectionUtils.isEmpty(result)) {
           if (result.size() % NUM == 0) {
               n = result.size() / NUM;
           } else {
               n = result.size() / NUM + 1;
           }
       }else{
           n=1;
       }
       List<String> fileNames = new ArrayList();// 用於存放生成的文件名稱s
       //文件流用於轉存文件

       for (int j = 0; j < n; j++) {
           Collection<T> result1=null;
       //切取每5000爲一個導出單位，存儲一個文件
       //對不足5000作處理；
           if (!CollectionUtils.isEmpty(result)) {
               if (j == n - 1) {
                   if (result.size() % NUM == 0) {
                       result1 = result.subList(5000 * j, 5000 * (j + 1));
                   } else {
                       result1 = result.subList(5000 * j,
                               5000 * j + result.size() % NUM);
                   }
               } else {
                   result1 = result.subList(5000 * j, 5000 * (j + 1));
               }
           }
        // 聲明一個工做薄
           Workbook workbook = new HSSFWorkbook();
        // 生成一個表格
        HSSFSheet sheet = (HSSFSheet) workbook.createSheet(title);
        // 設置表格默認列寬度爲18個字節
        sheet.setDefaultColumnWidth((short)18);


        String file = request.getRealPath("/files") + "/" + getFileName() + "-" +j+ ".xls";

       fileNames.add(file);

       FileOutputStream o = new FileOutputStream(file);

        // 生成一個樣式
        HSSFCellStyle style = (HSSFCellStyle) workbook.createCellStyle();
        // 設置這些樣式
        style.setFillForegroundColor(HSSFColor.GOLD.index);
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        // 生成一個字體
        HSSFFont font = (HSSFFont) workbook.createFont();
        font.setColor(HSSFColor.VIOLET.index);
        //font.setFontHeightInPoints((short) 12);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        // 把字體應用到當前的樣式
        style.setFont(font);

        // 指定當單元格內容顯示不下時自動換行
        style.setWrapText(true);

        // 聲明一個畫圖的頂級管理器
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();

        // 產生表格標題行
        //表頭的樣式
        HSSFCellStyle titleStyle = (HSSFCellStyle) workbook.createCellStyle();// 建立樣式對象
        titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);// 水平居中
        titleStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直居中
        // 設置字體
        HSSFFont titleFont = (HSSFFont) workbook.createFont(); // 建立字體對象
        titleFont.setFontHeightInPoints((short) 15); // 設置字體大小
        titleFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 設置粗體
      // titleFont.setFontName("黑體"); // 設置爲黑體字
        titleStyle.setFont(titleFont);
        sheet.addMergedRegion(new Region(0,(short)0,0,(short)(headers.length-1)));//指定合併區域
        HSSFRow rowHeader = sheet.createRow(0);
        HSSFCell cellHeader = rowHeader.createCell((short)0);   //只能往第一格子寫數據，而後應用樣式，就能夠水平垂直居中
        HSSFRichTextString textHeader = new HSSFRichTextString(title);
        cellHeader.setCellStyle(titleStyle);
        cellHeader.setCellValue(textHeader);

        HSSFRow row = sheet.createRow(1);
        for (int i = 0; i < headers.length; i++) {
            HSSFCell cell = row.createCell((short)i);
            cell.setCellStyle(style);
            HSSFRichTextString text = new HSSFRichTextString(headers[i]);
            cell.setCellValue(text);
         }
         // 遍歷集合數據，產生數據行
         if(result1 != null){
             int index = 2;
             for(T t:result1){
                 row = sheet.createRow(index);
                 index++;
                 for(short i = 0; i < columns.length; i++) {
                     HSSFCell cell = row.createCell(i);
                     String fieldName = columns[i];
                     String getMethodName = "get"
                         + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
                     Class tCls = t.getClass();
                     Method getMethod = tCls.getMethod(getMethodName, new Class[]{});
                     Object value = getMethod.invoke(t, new Class[]{});
                     String textValue = null;
                     if(value == null) {
                         textValue = "";
                     }else if (value instanceof Date) {
                         Date date = (Date) value;
                         SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                          textValue = sdf.format(date);
                      } else if (value instanceof byte[]) {
                         // 有圖片時，設置行高爲60px;
                         row.setHeightInPoints(60);
                         // 設置圖片所在列寬度爲80px,注意這裏單位的一個換算
                         sheet.setColumnWidth(i, (short) (35.7 * 80));
                         byte[] bsValue = (byte[]) value;
                         HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
                               1023, 255, (short) 6, index, (short) 6, index);
                         anchor.setAnchorType(2);
                         patriarch.createPicture(anchor, workbook.addPicture(
                               bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
                      } else{
                         //其它數據類型都看成字符串簡單處理
                         textValue = value.toString();
                      }

                     if(textValue!= null){
                         Pattern p = Pattern.compile("^//d+(//.//d+)?$");
                         Matcher matcher = p.matcher(textValue);
                         if(matcher.matches()){
                            //是數字看成double處理
                            cell.setCellValue(Double.parseDouble(textValue));
                         }else{
                            HSSFRichTextString richString = new HSSFRichTextString(textValue);
                            cell.setCellValue(richString);
                         }
                      }
                 }
             }
         }
         workbook.write(o);
         File srcfile[] = new File[fileNames.size()];
        for (int i = 0, n1 = fileNames.size(); i < n1; i++) {
            srcfile[i] = new File(fileNames.get(i));
        }
        ZipFiles(srcfile, zip);
        FileInputStream inStream = new FileInputStream(zip);
        byte[] buf = new byte[4096];
        int readLength;
        while (((readLength = inStream.read(buf)) != -1)) {
            out.write(buf, 0, readLength);
        }
        inStream.close();
       }
     }
    //獲取文件名字
    public static String getFileName(){
       // 文件名獲取
       Date date = new Date();
       SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
       String f = title + format.format(date);
       return f;
    }
    //壓縮文件
    public static void ZipFiles(java.io.File[] srcfile, java.io.File zipfile) {
       byte[] buf = new byte[1024];
       try {
           ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
                   zipfile));
           for (int i = 0; i < srcfile.length; i++) {
               FileInputStream in = new FileInputStream(srcfile[i]);
               out.putNextEntry(new ZipEntry(srcfile[i].getName()));
               int len;
               while ((len = in.read(buf)) > 0) {
                   out.write(buf, 0, len);
               }
               out.closeEntry();
               in.close();
           }
           out.close();
       } catch (IOException e) {
           e.printStackTrace();
       }
   }

    /** 設置響應頭 */
   public void setResponseHeader(HttpServletResponse response,String fileName) {
       try {
           this.title=fileName;
           response.reset();// 清空輸出流
           response.setContentType("application/octet-stream;charset=UTF-8");
           response.setHeader("Content-Disposition", "attachment;filename="
                   +new String(this.title.getBytes("GB2312"), "8859_1")
                   + ".zip");
           response.addHeader("Pargam", "no-cache");
           response.addHeader("Cache-Control", "no-cache");
       } catch (Exception ex) {
           ex.printStackTrace();
       }
   }
}

二、JavaAction 調取工具類：apache

/***
   * 會員瀏覽日誌查詢報表-Excel導出
   * @return
   */
   @SkipValidation
   public String exportlogCustomerDownload() {
       ExportToExcelUtil<LogCustomerDownload> excelUtil = new ExportToExcelUtil<LogCustomerDownload>();
       // 導出總記錄數
       excelTatol = request.getParameter("excelTatol") == null ? 10 : Integer.parseInt(request.getParameter("excelTatol"));
       OutputStream out = null;
       try {
           out = response.getOutputStream();

           excelUtil.setResponseHeader(response,"會員下載日誌表");

           String[] headers = { "會員id", "下載類型 ", "資源id","開始時間","結束時間","下載描述"};

           String[] columns = { "customerId", "downloadType","resourceId","startTime","endTime","downloadDesc"};

           // 瀏覽
           List<LogCustomerDownload> dataset = service
                   .getList(getQueryJsonAuthObject());
           excelUtil.exportExcel( headers, columns, dataset, out, request, "");

       } catch (Exception e1) {
           e1.printStackTrace();
       } finally {
           try {
               out.flush();
               out.close();
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
       return null;

   }

三、JS調取：app

//會員瀏覽日誌查詢報表-Excel導出function exportRecord(){ //標示：是否導出用戶詳細 if(excelTatol > 5000){ $.messager.show({ title:'提示信息!' , msg:'導出數據不能超過5000條!' }); }else{ var data = $.toJSON(getCustomerSearch()); window.location.href="logCustomerDownloadAction!exportlogCustomerDownload?queryJson="+data+"&excelTatol="+excelTatol; }}