import java.beans.PropertyDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
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;
public class ExportExcelUtil<T> {
public String[] exportExcelHeader(Class<T> clz){
Field fields[] = clz.getDeclaredFields();
String[] name = new String[fields.length];
try{
Field.setAccessible(fields, true);
for (int i = 1; i < fields.length; i++) {
name[i] = fields[i].getName();
System.out.println(name[i] + "-> ");
}
}
catch(Exception e){
e.printStackTrace();
}
return name;
}
public void exportExcel(Collection<T> dataset, OutputStream out) {
exportExcel("導出EXCEL文檔", null,null, dataset, out, "yyyy-MM-dd");
}
public void exportExcel(String[] headers, Collection<T> dataset,
OutputStream out) {
exportExcel("導出EXCEL文檔", null,headers, dataset, out, "yyyy-MM-dd");
}
public void exportExcel(String title, String[] headers,
Collection<T> dataset, OutputStream out) {
exportExcel(title,null, headers, dataset, out, "yyyy-MM-dd");
}
public void exportExcel(String title,String[] headerTitle, String[] headers,
Collection<T> dataset, OutputStream out) {
exportExcel(title,headerTitle, headers, dataset, out, "yyyy-MM-dd");
}
public void exportExcel(String[] headerTitle,String[] headers, Collection<T> dataset,
OutputStream out, String pattern) {
exportExcel("導出EXCEL文檔",headerTitle, 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集合中並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 headerTitle
*
表格屬性列名數組（標題）若為null，默認顯示headers
* @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", "deprecation", "rawtypes" })
public void exportExcel(String title,String[] headerTitle, String[] headers,
Collection<T> dataset, OutputStream out, String pattern) {
// 聲明一個工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 生成一個樣式
HSSFCellStyle style = workbook.createCellStyle();
// 設置這些樣式
style.setFillForegroundColor(HSSFColor.WHITE.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.BLACK.index);
font.setFontHeightInPoints((short) 12);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 把字體應用到當前的樣式
style.setFont(font);
// 生成並設置另一個樣式
HSSFCellStyle style2 = workbook.createCellStyle();
style2.setFillForegroundColor(HSSFColor.WHITE.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);
int sheetCount = 1000;
if (dataset.size() > sheetCount) {
Iterator<T> it = dataset.iterator();
for (int i = 0; i <= 4; i++) {
int index = 0;
List<T> list = new ArrayList<T>();
while (it.hasNext()) {
index++;
if (index < sheetCount) {
list.add(it.next());
} else {
break;
}
}
try {
generateSheet(list, style, style2, workbook, pattern,headerTitle, headers,
title + "_" + (i + 1));
} catch (Exception e) {
e.printStackTrace();
}
}
} else {
try {
generateSheet(dataset, style, style2, workbook, pattern,headerTitle, headers,
title);
} catch (Exception e) {
e.printStackTrace();
}
}
try {
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void generateSheet(Collection<T> dataset, HSSFCellStyle style,
HSSFCellStyle style2, HSSFWorkbook workbook, String pattern,
String[] headerTitle,String[] headers, String title) throws Exception {
// 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);
// 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("author");
// 產生表格標題行
HSSFRow row = sheet.createRow(0);
String[] showTitle = headers;
if(!EmptyUtilHelper.isEmpty(headerTitle)) showTitle = headerTitle;
int indexTitle = 0;//excel列下標
for (short i = 0; i < showTitle.length; i++) {
if(EmptyUtilHelper.isEmpty(showTitle[i])) continue;
HSSFCell cell = row.createCell(indexTitle);
cell.setCellStyle(style);
HSSFRichTextString text = new HSSFRichTextString(showTitle[i]);
cell.setCellValue(text);
indexTitle++;
}
if(EmptyUtilHelper.isEmpty(dataset)) return;
// 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();
Class tCls = t.getClass();
Method[] methods=t.getClass().getMethods();
// 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=new Field[headers.length];
for (short j = 0; j < headers.length; j++) {
if(EmptyUtilHelper.isEmpty(headers[j])) continue;
Field field1 = tCls.getDeclaredField(headers[j]);
fields[j]=field1;
}
int indexText = 0;//excel列下標
for (short i = 0; i < fields.length; i++) {
if(EmptyUtilHelper.isEmpty(fields[i])) continue;
Field field = fields[i];
HSSFCell cell = row.createCell(indexText);
cell.setCellStyle(style2);
String fieldName = field.getName();
PropertyDescriptor pd=new PropertyDescriptor(fieldName,tCls);
Method getMethod=pd.getReadMethod();
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 Boolean) {
boolean bValue = (Boolean) value;
textValue = "是";
if (!bValue) textValue = "否";
} 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(indexText, (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
if (value == null) value = "";
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.BLACK.index);
richString.applyFont(font3);
cell.setCellValue(richString);
}
}
indexText++;
}
}
}
public static void main(String[] args) throws Exception {
//
ExportExcelUtil<MenuVo> ex = new ExportExcelUtil<MenuVo>();
////
String[] headers = ex.exportExcelHeader(MenuVo.class);
// List<MenuVo> list = new ArrayList<MenuVo>();//(List<MenuVo>) hashMap.get("list");
// String[] headerTitle = {"編號","名稱","權限"};
// String[] headers = {"id","name","privilege"};
// OutputStream out = new FileOutputStream("F://c.xls");
// ex.exportExcel(headers, list, out);
// out.close();
// JOptionPane.showMessageDialog(null, "導出成功!");
// System.out.println("excel導出成功！");
}
}