package org.leno.export.util;
import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.text.SimpleDateFormat;
import javax.swing.JOptionPane;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
/**
* 利用開源組件POI3.0.2動態導出EXCEL文檔 轉載時請保留以下信息，注明出處！
*
* @author leno
* @version v1.0
* @param <T>
* 應用泛型，代表任意一個符合javabean風格的類
* 注意這里為了簡單起見，boolean型的屬性xxx的get器方式為getXxx(),而不是isXxx()
* byte[]表jpg格式的圖片數據
*/
public class ExportExcel<T> {
public void exportExcel(Collection<T> dataset, OutputStream out) {
exportExcel("測試POI導出EXCEL文檔", null, dataset, out, "yyyy-MM-dd");
}
public void exportExcel(String[] headers, Collection<T> dataset,
OutputStream out) {
exportExcel("測試POI導出EXCEL文檔", 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，可以將放置在JAVA集合中并且符號一定條件的數據以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
* 需要顯示的數據集合,集合中一定要放置符合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，可以將EXCEL文檔導出到本地文件或者網絡中
* @param pattern
* 如果有時間數據，設定輸出格式。默認為"yyy-MM-dd"
*/
@SuppressWarnings("unchecked")
public void exportExcel(String title, String[] headers,
Collection<T> dataset, OutputStream out, String pattern) {
// 聲明一個工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 生成一個表格
HSSFSheet sheet = workbook.createSheet(title);
// 設置表格默認列寬度為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);
// 生成并設置另一個樣式
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();
// 定義注釋的大小和位置,詳見文檔
HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
0, 0, 0, (short) 4, 2, (short) 6, 5));
// 設置注釋內容
comment.setString(new HSSFRichTextString("可以在POI中添加注釋！"));
// 設置注釋作者，當鼠標移動到單元格上是可以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屬性的先后順序，動態調用getXxx()方法得到屬性值
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[] {});
// 判斷值的類型后進行強制類型轉換
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，設置行高為60px;
row.setHeightInPoints(60);
// 設置圖片所在列寬度為80px,注意這里單位的一個換算
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 {
// 其它數據類型都當作字符串簡單處理
textValue = value.toString();
}
// 如果不是圖片數據，就利用正則表達式判斷textValue是否全部由數字組成
if (textValue != null) {
Pattern p = Pattern.compile("^//d+(//.//d+)?{1}quot;);
Matcher matcher = p.matcher(textValue);
if (matcher.matches()) {
// 是數字當作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) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
// 清理資源
}
}
}
try {
workbook.write(out);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
// 測試學生
ExportExcel<Student> ex = new ExportExcel<Student>();
String[] headers = { "學號", "姓名", "年齡", "性別", "出生日期" };
List<Student> dataset = new ArrayList<Student>();
dataset.add(new Student(10000001, "張三", 20, true, new Date()));
dataset.add(new Student(20000002, "李四", 24, false, new Date()));
dataset.add(new Student(30000003, "王五", 22, true, new Date()));
// 測試圖書
ExportExcel<Book> ex2 = new ExportExcel<Book>();
String[] headers2 = { "圖書編號", "圖書名稱", "圖書作者", "圖書價格", "圖書ISBN",
"圖書出版社", "封面圖片" };
List<Book> dataset2 = new ArrayList<Book>();
try {
BufferedInputStream bis = new BufferedInputStream(
new FileInputStream("book.jpg"));
byte[] buf = new byte[bis.available()];
while ((bis.read(buf)) != -1) {
//
}
dataset2.add(new Book(1, "jsp", "leno", 300.33f, "1234567",
"清華出版社", buf));
dataset2.add(new Book(2, "java編程思想", "brucl", 300.33f, "1234567",
"陽光出版社", buf));
dataset2.add(new Book(3, "DOM藝術", "lenotang", 300.33f, "1234567",
"清華出版社", buf));
dataset2.add(new Book(4, "c++經典", "leno", 400.33f, "1234567",
"清華出版社", buf));
dataset2.add(new Book(5, "c#入門", "leno", 300.33f, "1234567",
"湯春秀出版社", buf));
OutputStream out = new FileOutputStream("E://a.xls");
OutputStream out2 = new FileOutputStream("E://b.xls");
ex.exportExcel(headers, dataset, out);
ex2.exportExcel(headers2, dataset2, out2);
out.close();
JOptionPane.showMessageDialog(null, "導出成功!");
System.out.println("excel導出成功！");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}