java之poi操作execel表

首先引入pom

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>4.0.1</version>
        </dependency>

寫execel 和 讀 execel 簡單的例子

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.Test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;

public class DemoPoi {
	//cell轉化任意類型
    private static Object getCellValue(Cell cell) {
        Object o = null;
        //獲得單元格的類型
        CellType cellType = cell.getCellType();
        switch (cellType){
            case STRING:
                o=cell.getStringCellValue();//字符串數據
                break;
            case NUMERIC: //數字類型  , 在excel中日期類型是數字類型
                //判斷是日期類型 還是數字類型
                if(DateUtil.isCellDateFormatted(cell)){ //是不是日期類型
                    //是日期類型
                    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
                    o = simpleDateFormat.format(cell.getDateCellValue());
                }else{
                    //數字類型
                    o=cell.getNumericCellValue();
                }
                break;
            case BOOLEAN:
                o=cell.getBooleanCellValue();//獲得布爾類型數據
                break;
            default:
                break;
        }

        return o;
    }


    @Test
    public void ReadExecel() throws IOException {
        Workbook workbook= new XSSFWorkbook("D:/demo.xlsx");
        //3.獲得表
        Sheet sheet = workbook.getSheetAt(0);
        int rows = sheet.getLastRowNum();
        /*遍歷行數*/
        for (int i = 0; i < rows; i++) {
            short lastCellNum = sheet.getRow(i).getLastCellNum();
            for (int j = 0; j < lastCellNum ; j++) {
                Cell cell = sheet.getRow(i).getCell(j);

                if (cell != null) {
                    if (j == lastCellNum - 1) {
                        Object cellValue = getCellValue(cell);
                        System.out.println(cellValue);
                    } else {
                        Object cellValue = getCellValue(cell);
                        System.out.print(cellValue+"  ");
                    }
                }



            }
        }
    }


    /**
   	 * 寫execel
     * 1.有excel的對象 workBook
     * 2.有sheet表
     * 3.有行
     * 4.有單元格(列)
     * 5.賦值數據
     * 6.設置樣式
     * 7.下載(保存到本地)
     * @param args
     */
    public static void main(String[] args) throws IOException {
        Workbook workbook = new XSSFWorkbook();
        Sheet sheet = workbook.createSheet();
        Row row = sheet.createRow(1);
        //row.setHeight((short) (50*20));
        //設置行高
        row.setHeightInPoints(50);
        Cell cell = row.createCell(1);
        //設置列寬
        sheet.setColumnWidth(1,20*256);



        cell.setCellValue("加油!大智");

        //設置樣式
        CellStyle cellStyle = workbook.createCellStyle();
        //單元格周邊加線條
        cellStyle.setBorderBottom(BorderStyle.THIN);
        cellStyle.setBorderLeft(BorderStyle.THIN);
        cellStyle.setBorderTop(BorderStyle.THIN);
        cellStyle.setBorderRight(BorderStyle.THIN);
        cell.setCellStyle(cellStyle);

        //設置上下,左右居中
        cellStyle.setAlignment(HorizontalAlignment.CENTER);
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        cell.setCellStyle(cellStyle);

        //設置字體
        Font font = workbook.createFont();
        font.setBold(true);
        font.setFontHeightInPoints((short) 20);
        //設置顏色
        font.setColor((short) 3);
        font.setFontName("楷體");

        cellStyle.setFont(font);
        cell.setCellStyle(cellStyle);

        /*下載保存*/
        FileOutputStream fileOutputStream = new FileOutputStream(new File("D://demo2112.xlsx"));
        workbook.write(fileOutputStream);
        fileOutputStream.close();
    }
}

上傳和下載execel

1.上傳execel

@RequestMapping(value = "import",name = "上傳貨物")
    public  String importExecel(String contractId,MultipartFile file) throws IOException {
//創建貨物集合
        List<ContractProduct> list =new ArrayList<ContractProduct>();
        //獲取數據
        if (file != null) {
            //加載文件
            XSSFWorkbook workbook = new XSSFWorkbook(file.getInputStream());
            XSSFSheet sheet = workbook.getSheetAt(0);
            int lastRowNum = sheet.getLastRowNum();
            Row row = null;
            Cell cell = null;
            for (int i = 1; i <= lastRowNum; i++) {
                row = sheet.getRow(i);
                short lastCellNum = row.getLastCellNum();
                Object[] objects = new Object[lastCellNum];
                for (int j = 0; j < lastCellNum; j++) {
                    cell = row.getCell(j);
                    if (cell != null) {
                  	  //調用上傳工具類
                        Object cellValue = uploadFile.getCellValue(cell);
                        objects[j] = cellValue;
                    }
                }
                System.out.println(Arrays.toString(objects));
                //調用自定義構造
                ContractProduct contractProduct = new ContractProduct(objects, user.getCompanyId(), user.getCompanyName(), contractId);
                list.add(contractProduct);
                //循環結束
            }
            contractProductService.saveList(list);
        } else {
            System.out.println("沒有上傳文件");
        }
        ///WEB-INF/pages/cargo/contractProduct/import.jsp
        return "redirect:/cargo/contractProduct/toImport.do?contractId="+contractId;
    }

上傳重點:

//看構造
ContractProduct contractProduct = new ContractProduct(objects, user.getCompanyId(), user.getCompanyName(), contractId);

//就這
public ContractProduct(Object []objs, String companyId, String companyName,String contractId) {
		this.factoryName = objs[1].toString();
		this.productNo = objs[2].toString();
		this.cnumber = ((Double) objs[3]).intValue();
		this.packingUnit = objs[4].toString();
		this.loadingRate = objs[5].toString();
		this.boxNum = ((Double) objs[6]).intValue();
		this.price = (Double) objs[7];			//單價
		this.productRequest=objs[8].toString();
		this.productDesc=objs[9].toString();
		this.companyId = companyId;
		this.companyName = companyName;
		this.contractId = contractId;
	}

1.1 上傳工具類 轉換cell各種類型爲object

//調用上傳工具類
Object cellValue = uploadFile.getCellValue(cell);

//詳情
    public static Object getCellValue(Cell cell) {
        Object o = null;
        //獲得單元格的類型
        CellType cellType = cell.getCellType();
        switch (cellType){
            case STRING:
                o=cell.getStringCellValue();//字符串數據
                break;
            case NUMERIC: //數字類型  , 在excel中日期類型是數字類型
                //判斷是日期類型 還是數字類型
                if(DateUtil.isCellDateFormatted(cell)){ //是不是日期類型
                    //是日期類型
                    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
                    o = simpleDateFormat.format(cell.getDateCellValue());
                }else{
                    //數字類型
                    o=cell.getNumericCellValue();
                }
                break;
            case BOOLEAN:
                o=cell.getBooleanCellValue();//獲得布爾類型數據
                break;
            default:
                break;
        }

        return o;
    }

2.下載execel:

    @RequestMapping(value = "printExcel",name = "打印出貨表")
    public  String printExcel(String  inputDate) throws IOException {
        //獲取合同數據
        List<ContractProductVo> list=contractService.findByShipTime(inputDate,user.getCompanyId());
        System.out.println(list);
        //初始化值
        Row row = null;
        Cell cell = null;

        //創建工作簿
        Workbook  workbook = new SXSSFWorkbook();
        //創建表
        Sheet sheet = workbook.createSheet();
        //創建大標題
        row = sheet.createRow(0);
       //創建列
        cell= row.createCell(1);
        //合併單元格   從0行開始0行結束  從第一列 到 第8列結束
        sheet.addMergedRegion(new CellRangeAddress(0,0,1,8));

        //2019年2月 設置標題
        cell.setCellValue(inputDate.replace("-","年")+"月出貨表");
        //設置樣式
        CellStyle cellStyle = bigTitle(workbook);
        cell.setCellStyle(cellStyle);
        //設置寬高
        sheet.setDefaultRowHeightInPoints(36);
        sheet.setDefaultRowHeight((short)(36*20));
        sheet.setColumnWidth(1, 26 * 256);
        sheet.setColumnWidth(2, 11 * 256);
        sheet.setColumnWidth(3, 30 * 256);
        sheet.setColumnWidth(4, 12 * 256);
        sheet.setColumnWidth(5, 15 * 256);
        sheet.setColumnWidth(6, 15 * 256);
        sheet.setColumnWidth(7, 11 * 256);
        sheet.setColumnWidth(8, 11 * 256);
        sheet.setColumnWidth(9, 11 * 256);
        //第二行 小標題  給每列賦值
        Object[] objects = {"","客人", "訂單號", "貨號", "數量", "工廠", "工廠交期", "船期", "貿易條款"};
        row = sheet.createRow(1);
        CellStyle title = title(workbook);
        for (int i = 0; i <= 8 ; i++) {
            cell = row.createCell(i);
            cell.setCellValue((String)objects[i]);
            cell.setCellStyle(title);
        }

        //循環數據 遍歷輸出
        for (int i = 1; i < list.size(); i++) {
            //創建第三行   數據開始的第一行
            row = sheet.createRow(i+1);
            //獲取第一個數據對象
            ContractProductVo contractProductVo = list.get(i-1);
            //一行 8個單元格賦值
            for (int j = 1; j <= 8 ; j++) {
                cell = row.createCell(j);
                switch (j) {
                    case 1:
                        cell.setCellValue(contractProductVo.getCustomName());
                        break;
                    case 2:
                        cell.setCellValue(contractProductVo.getContractNo());
                        break;
                    case 3:
                        cell.setCellValue(contractProductVo.getProductNo());
                        break;
                    case 4:
                        cell.setCellValue(contractProductVo.getCnumber());
                        break;
                    case 5:
                        cell.setCellValue(contractProductVo.getFactoryName());
                        break;
                    case 6:
                        cell.setCellValue(contractProductVo.getDeliveryPeriod());
                        break;
                    case 7:
                        cell.setCellValue(contractProductVo.getShipTime());
                        break;
                    case 8:
                        cell.setCellValue(contractProductVo.getTradeTerms());
                        break;
                        default:
                            break;
                }
            }
        }
        //文件寫回 瀏覽器
        DownloadUtil downloadUtil = new DownloadUtil();
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        workbook.write(byteArrayOutputStream);
        downloadUtil.download(byteArrayOutputStream,response,"出貨表.xlsx");
        return "cargo/print/contract-print";
    }

下載的工具類:

package com.czh.common.utils;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class DownloadUtil {
	
	/**
	 * @param filePath 要下載的文件路徑
	 * @param returnName 返回的文件名
	 * @param response HttpServletResponse
	 * @param delFlag 是否刪除文件
	 */
	protected void download(String filePath,String returnName,HttpServletResponse response,boolean delFlag){
		this.prototypeDownload(new File(filePath), returnName, response, delFlag);
	}


	/**
	 * @param file 要下載的文件
	 * @param returnName 返回的文件名
	 * @param response HttpServletResponse
	 * @param delFlag 是否刪除文件
	 */
	protected void download(File file,String returnName,HttpServletResponse response,boolean delFlag){
		this.prototypeDownload(file, returnName, response, delFlag);
	}
	
	/**
	 * @param file 要下載的文件
	 * @param returnName 返回的文件名
	 * @param response HttpServletResponse
	 * @param delFlag 是否刪除文件
	 */
	public void prototypeDownload(File file,String returnName,HttpServletResponse response,boolean delFlag){
		// 下載文件
		FileInputStream inputStream = null;
		ServletOutputStream outputStream = null;
		try {
			if(!file.exists()) return;
			response.reset();
			//設置響應類型	PDF文件爲"application/pdf"，WORD文件爲："application/msword"， EXCEL文件爲："application/vnd.ms-excel"。  
			response.setContentType("application/octet-stream;charset=utf-8");

			//設置響應的文件名稱,並轉換成中文編碼
			//returnName = URLEncoder.encode(returnName,"UTF-8");
			returnName = response.encodeURL(new String(returnName.getBytes(),"iso8859-1"));	//保存的文件名,必須和頁面編碼一致,否則亂碼
			
			//attachment作爲附件下載；inline客戶端機器有安裝匹配程序，則直接打開；注意改變配置，清除緩存，否則可能不能看到效果
			response.addHeader("Content-Disposition",   "attachment;filename="+returnName);  
			
			//將文件讀入響應流
			inputStream = new FileInputStream(file);
			outputStream = response.getOutputStream();
			int length = 1024;
			int readLength=0;
			byte buf[] = new byte[1024];
			readLength = inputStream.read(buf, 0, length);
			while (readLength != -1) {
				outputStream.write(buf, 0, readLength);
				readLength = inputStream.read(buf, 0, length);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				outputStream.flush();
			} catch (IOException e) {
				e.printStackTrace();
			}
			try {
				outputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			try {
				inputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			//刪除原文件
			
			if(delFlag) {				
				file.delete();
			}
		}
	}

	/**
	 * @param byteArrayOutputStream 將文件內容寫入ByteArrayOutputStream
	 * @param response HttpServletResponse	寫入response
	 * @param returnName 返回的文件名
	 */
	public void download(ByteArrayOutputStream byteArrayOutputStream, HttpServletResponse response, String returnName) throws IOException{
		response.setContentType("application/octet-stream;charset=utf-8");
		//保存的文件名,必須和頁面編碼一致,否則亂碼
		returnName = response.encodeURL(new String(returnName.getBytes(),"iso8859-1"));
		System.out.println("returnName : "+returnName);

		response.addHeader("Content-Disposition",   "attachment;filename=" + returnName);  
		response.setContentLength(byteArrayOutputStream.size());
		
		ServletOutputStream outputstream = response.getOutputStream();	//取得輸出流
		byteArrayOutputStream.writeTo(outputstream);					//寫到輸出流
		byteArrayOutputStream.close();									//關閉
		outputstream.flush();											//刷數據
	}
}

模板打印execel

@RequestMapping(value = "printExcel",name = "打印出貨表")
   public  String printExcel(String  inputDate) throws IOException {
       //獲取合同數據
       List<ContractProductVo> list=contractService.findByShipTime(inputDate,user.getCompanyId());
       System.out.println(list);
       //初始化值
       Row row = null;
       Cell cell = null;
       //讀取模板數據
       InputStream is = session.getServletContext().getResourceAsStream("/make/xlsprint/tOUTPRODUCT.xlsx");
       //創建workbook
       XSSFWorkbook workbook = new XSSFWorkbook(is);
       XSSFSheet sheet = workbook.getSheetAt(0);
       row = sheet.getRow(0);
       cell= row.getCell(1);
       //大標題
       cell.setCellValue( inputDate.replace("-","年")+"月出貨表");
        //小標題已寫好
       //開始寫數據
       //獲取樣式
       row = sheet.getRow(2);
       short lastCellNum = row.getLastCellNum();
       //存儲每個樣式
       CellStyle[] cellStyles = new CellStyle[lastCellNum];
       for (int i = 1; i < lastCellNum; i++) {
           cell = row.getCell(i);
           CellStyle cellStyle = cell.getCellStyle();
           cellStyles[i]=cellStyle;
       }

       //循環數據 遍歷輸出
       for (int i = 1; i < list.size(); i++) {
           //創建第三行   數據開始的第一行
           row = sheet.createRow(i+1);
           //獲取第一個數據對象
           ContractProductVo contractProductVo = list.get(i-1);
           //一行 8個單元格賦值
           for (int j = 1; j <= 8 ; j++) {
               cell = row.createCell(j);
               switch (j) {
                   case 1:
                       cell.setCellValue(contractProductVo.getCustomName());
                       cell.setCellStyle(cellStyles[1]);
                       break;
                   case 2:
                       cell.setCellValue(contractProductVo.getContractNo());
                       cell.setCellStyle(cellStyles[2]);
                       break;
                   case 3:
                       cell.setCellValue(contractProductVo.getProductNo());
                       cell.setCellStyle(cellStyles[3]);
                       break;
                   case 4:
                       cell.setCellValue(contractProductVo.getCnumber());
                       cell.setCellStyle(cellStyles[4]);
                       break;
                   case 5:
                       cell.setCellValue(contractProductVo.getFactoryName());
                       cell.setCellStyle(cellStyles[5]);
                       break;
                   case 6:
                       SimpleDateFormat simpleDateFormat1 = new SimpleDateFormat("yyyy-MM-dd");
                       String format1 = simpleDateFormat1.format(contractProductVo.getDeliveryPeriod());
                       cell.setCellValue(format1);
                       cell.setCellStyle(cellStyles[6]);
                       break;
                   case 7:
                       SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
                       String format = simpleDateFormat.format(contractProductVo.getShipTime());
                       System.out.println(format);
                       cell.setCellValue(format);
                       cell.setCellStyle(cellStyles[7]);
                       break;
                   case 8:
                       cell.setCellValue(contractProductVo.getTradeTerms());
                       cell.setCellStyle(cellStyles[8]);
                       break;
                   default:
                       break;
               }
           }
       }



       //文件寫回 瀏覽器
       DownloadUtil downloadUtil = new DownloadUtil();
       ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
       workbook.write(byteArrayOutputStream);
       downloadUtil.download(byteArrayOutputStream,response,"出貨表.xlsx");
       return "cargo/print/contract-print";
   }

一些簡單的樣式

 //大標題的樣式
    public CellStyle bigTitle(Workbook wb){
        CellStyle style = wb.createCellStyle();
        Font font = wb.createFont();
        font.setFontName("宋體");
        font.setFontHeightInPoints((short)16);
        font.setBold(true);//字體加粗
        style.setFont(font);
        style.setAlignment(HorizontalAlignment.CENTER);				//橫向居中
        style.setVerticalAlignment(VerticalAlignment.CENTER);		//縱向居中
        return style;
    }

    //小標題的樣式
    public CellStyle title(Workbook wb){
        CellStyle style = wb.createCellStyle();
        Font font = wb.createFont();
        font.setFontName("黑體");
        font.setFontHeightInPoints((short)12);
        style.setFont(font);
        style.setAlignment(HorizontalAlignment.CENTER);				//橫向居中
        style.setVerticalAlignment(VerticalAlignment.CENTER);		//縱向居中
        style.setBorderTop(BorderStyle.THIN);						//上細線
        style.setBorderBottom(BorderStyle.THIN);					//下細線
        style.setBorderLeft(BorderStyle.THIN);						//左細線
        style.setBorderRight(BorderStyle.THIN);						//右細線
        return style;
    }

    //文字樣式
    public CellStyle text(Workbook wb){
        CellStyle style = wb.createCellStyle();
        Font font = wb.createFont();
        font.setFontName("Times New Roman");
        font.setFontHeightInPoints((short)10);

        style.setFont(font);

        style.setAlignment(HorizontalAlignment.LEFT);				//橫向居左
        style.setVerticalAlignment(VerticalAlignment.CENTER);		//縱向居中
        style.setBorderTop(BorderStyle.THIN);						//上細線
        style.setBorderBottom(BorderStyle.THIN);					//下細線
        style.setBorderLeft(BorderStyle.THIN);						//左細線
        style.setBorderRight(BorderStyle.THIN);						//右細線

        return style;
    }

測試例子:

		CellStyle cellStyle = bigTitle(workbook);
        cell.setCellStyle(cellStyle);