JavaWeb中將數據從數據庫導出到Excel表的實例

時間 2020-06-08 標籤 javaweb 中將數據從數據庫導出 excel 表實例

原文地址：http://blog.csdn.net/tmaskboy/article/details/51525333html

使用POI導出Excel，通過修改支持文件彈窗選擇，在使用中包括如下幾步。
1.添加jar包
java

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.10.1</version>
</dependency>

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.10.1</version>
</dependency>

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-examples</artifactId>
<version>3.10.1</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-excelant</artifactId>
<version>3.10.1</version>
</dependency>

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.10.1</version>
</dependency>

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>3.10.1</version>
</dependency>正則表達式

2.添加ExportExcel類apache

package com.sx2.utils;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


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.HSSFComment;
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;

/** * 利用開源組件POI3.0.2動態導出EXCEL文檔 * * @version v1.0 * @param <T> * 應用泛型，表明任意一個符合javabean風格的類 * 注意這裏爲了簡單起見，boolean型的屬性xxx的get器方式爲getXxx(),而不是isXxx() * byte[]表jpg格式的圖片數據 */
public class ExportExcel<T> {
    public static final String FILE_SEPARATOR = System.getProperties()
            .getProperty("file.separator");

    public void exportExcel(Collection<T> dataset, OutputStream out) {
        exportExcel("測試POI導出EXCEL文檔", null, dataset, out, "yyyy-MM-dd");
    }
**//該方法本身修改了，將表格頭傳入的方式**
    public void exportExcel(String title,String[] headers, Collection<T> dataset,
            OutputStream out) {
        exportExcel(title, headers, dataset, out, "yyyy-MM-dd");
    }

    public void exportExcel(String[] headers, Collection<T> dataset,
            OutputStream out, String pattern) {
        exportExcel("測試POI導出EXCEL文檔", headers, dataset, out, pattern);
    }

    /** * 這是一個通用的方法，利用了JAVA的反射機制，能夠將放置在JAVA集合中而且符號必定條件的數據以EXCEL 的形式輸出到指定IO設備上 * * @param title * 表格標題名 * @param headers * 表格屬性列名數組 * @param dataset * 須要顯示的數據集合,集合中必定要放置符合javabean風格的類的對象。此方法支持的 * javabean屬性的數據類型有基本數據類型及String,Date,byte[](圖片數據) * @param out * 與輸出設備關聯的流對象，能夠將EXCEL文檔導出到本地文件或者網絡中 * @param pattern * 若是有時間數據，設定輸出格式。默認爲"yyy-MM-dd" */
    @SuppressWarnings("unchecked")
    public void exportExcel(String title, String[] headers,
            Collection<T> dataset, OutputStream out, String pattern) {
        // 聲明一個工做薄
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 生成一個表格
        HSSFSheet sheet = workbook.createSheet(title);
        // 設置表格默認列寬度爲15個字節
        sheet.setDefaultColumnWidth((short) 15);
        // 生成一個樣式
        HSSFCellStyle style = workbook.createCellStyle();
        // 設置這些樣式
        style.setFillForegroundColor(HSSFColor.SKY_BLUE.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 = 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);
        // 生成並設置另外一個樣式
        HSSFCellStyle style2 = workbook.createCellStyle();
        style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
        style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        // 生成另外一個字體
        HSSFFont font2 = workbook.createFont();
        font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        // 把字體應用到當前的樣式
        style2.setFont(font2);
        // 聲明一個畫圖的頂級管理器
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
        // 定義註釋的大小和位置,詳見文檔
        HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
                0, 0, 0, (short) 4, 2, (short) 6, 5));

        // 設置註釋內容
    //  comment.setString(new HSSFRichTextString("能夠在POI中添加註釋！"));

        // 設置註釋做者，當鼠標移動到單元格上是能夠在狀態欄中看到該內容.
        comment.setAuthor("leno");
        // 產生表格標題行
        HSSFRow row = sheet.createRow(0);
        for (short i = 0; i < headers.length; i++) {
            HSSFCell cell = row.createCell(i);
            cell.setCellStyle(style);
            HSSFRichTextString text = new HSSFRichTextString(headers[i]);
            cell.setCellValue(text);
        }
        // 遍歷集合數據，產生數據行
        Iterator<T> it = dataset.iterator();
        int index = 0;
        while (it.hasNext()) {
            index++;
            row = sheet.createRow(index);
            T t = (T) it.next();
            // 利用反射，根據javabean屬性的前後順序，動態調用getXxx()方法獲得屬性值
            Field[] fields = t.getClass().getDeclaredFields();
            for (short i = 0; i < fields.length; i++) {
                HSSFCell cell = row.createCell(i);
                cell.setCellStyle(style2);
                Field field = fields[i];
                String fieldName = field.getName();
                String getMethodName = "get"
                        + fieldName.substring(0, 1).toUpperCase()
                        + fieldName.substring(1);
                try {
                    Class tCls = t.getClass();
                    Method getMethod = tCls.getMethod(getMethodName,
                            new Class[] {});
                    Object value = getMethod.invoke(t, new Object[] {});
                    // 判斷值的類型後進行強制類型轉換
                    String textValue = null;
                    // if (value instanceof Integer) {
                    // int intValue = (Integer) value;
                    // cell.setCellValue(intValue);
                    // } else if (value instanceof Float) {
                    // float fValue = (Float) value;
                    // textValue = new HSSFRichTextString(
                    // String.valueOf(fValue));
                    // cell.setCellValue(textValue);
                    // } else if (value instanceof Double) {
                    // double dValue = (Double) value;
                    // textValue = new HSSFRichTextString(
                    // String.valueOf(dValue));
                    // cell.setCellValue(textValue);
                    // } else if (value instanceof Long) {
                    // long longValue = (Long) value;
                    // cell.setCellValue(longValue);
                    // }
                    if (value instanceof Boolean) {
                        boolean bValue = (Boolean) value;
                        textValue = "男";
                        if (!bValue) {
                            textValue = "女";
                        }
                    } 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));
                        // sheet.autoSizeColumn(i);
                        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();
                    }
                    // 若是不是圖片數據，就利用正則表達式判斷textValue是否所有由數字組成
                    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);
                            HSSFFont font3 = workbook.createFont();
                            font3.setColor(HSSFColor.BLUE.index);
                            richString.applyFont(font3);
                            cell.setCellValue(richString);
                        }
                    }
                } catch (SecurityException e) {
                    e.printStackTrace();
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                } finally {
                    // 清理資源
                }
            }
        }
        try {
            workbook.write(out);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

3.程序導出所請求的方法
此處使用的SSM框架，Controller負責處理請求數組

@ResponseBody
@RequestMapping("/export.html")
private void Export(HttpServletResponse response) throws UnsupportedEncodingException {

    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");
    String dateString = "績效考覈彙總表"+formatter.format(new Date())+".xls";

    String filename= new String(dateString.getBytes(),"iso-8859-1");//中文文件名必須使用此句話   response.setContentType("application/octet-stream");
    response.setContentType("application/OCTET-STREAM;charset=UTF-8");
    response.setHeader("Content-Disposition", "attachment;filename=" + filename);


    String[] headers = { "序號","AA", "BB", "CC", "DD","EE", "FF","GG", "HH", "II", "JJ","KK",
            "LL" ,"MM", "NN", "OO", "PP"};  //表格的標題欄   List<DataReport> list = dataReportService.findAll();
    //WorkloadExport 爲將要導出的類，也就是表格的一行記錄，裏面的全部字段都不能爲空，必須生成set get方法  //導出列順序和類中成員順序一致  try {
        ExportExcel<DataReport> ex = new ExportExcel<DataReport>();  //構造導出類   OutputStream out = new BufferedOutputStream(response.getOutputStream());

        String  title = list.get(0).getDataAA();  //title須要本身指定 好比寫Sheet   ex.exportExcel(title,headers, list, out);  //title是excel表中底部顯示的表格名，如Sheet  out.close();
        //JOptionPane.showMessageDialog(null, "導出成功!");  //System.out.println("excel導出成功！");  } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

最後程序導出數組以下：
瀏覽器

注：GOOGLE瀏覽器是默認下載不會彈出下載框，360瀏覽器會彈出下載框