POI导出EXCEL经典实现(poi-3[1].0.1-FINAL-20070705.jar)

POI导出EXCEL经典实现

在web开发中，有一个经典的功能，就是数据的导入导出。特别是数据的导出，在生产管理或者财务系统中用的非常普遍，因为这些系统经常要做一些报表打印的工作。而数据导出的格式一般是EXCEL或者PDF，我这里就用两篇文章分别给大家介绍下。（注意，我们这里说的数据导出可不是数据库中的数据导出！么误会啦^_^）

呵呵，首先我们来导出EXCEL格式的文件吧。现在主流的操作Excel文件的开源工具有很多,用得比较多的就是Apache的POI及JExcelAPI。这里我们用Apache POI！我们先去Apache的大本营下载POI的jar包：https://www.wendangku.net/doc/501545390.html,/ ，我这里使用的是3.0.2版本。

将3个jar包导入到classpath下，什么？忘了怎么导包？不会吧！好，我们来写一个导出Excel的实用类（所谓实用，是指基本不用怎么修改就可以在实际项目中直接使用的！）。我一直强调做类也好，做方法也好，一定要通用性和灵活性强。下面这个类就算基本贯彻了我的这种思想。那么，熟悉许老师风格的人应该知道，这时候该要甩出一长串代码了。没错，大伙请看：

package org.leno.export.util;

import java.util.Date;

public class Student {

private long id;

private String name;

private int age;

private boolean sex;

private Date birthday;

public Student() {

super();

// TODO Auto-generated constructor stub

}

public Student(long id, String name, int age, boolean sex, Date birthday) { super();

this.id = id;

https://www.wendangku.net/doc/501545390.html, = name;

this.age = age;

this.sex = sex;

this.birthday = birthday;

}

public long getId() {

return id;

}

public void setId(long id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) { https://www.wendangku.net/doc/501545390.html, = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public boolean getSex() {

return sex;

}

public void setSex(boolean sex) { this.sex = sex;

}

public Date getBirthday() {

return birthday;

}

public void setBirthday(Date birthday) { this.birthday = birthday;

}

}

package org.leno.export.util;

public class Book {

private int bookId;

private String name;

private String author;

private float price;

private String isbn;

private String pubName;

private byte[] preface;

public Book() {

super();

}

public Book(int bookId, String name, String author, float price, String isbn, String pubName, byte[] preface) { super();

this.bookId = bookId;

https://www.wendangku.net/doc/501545390.html, = name;

this.author = author;

this.price = price;

this.isbn = isbn;

this.pubName = pubName;

this.preface = preface;

}

public int getBookId() {

return bookId;

}

public void setBookId(int bookId) {

this.bookId = bookId;

}

public String getName() {

return name;

}

public void setName(String name) { https://www.wendangku.net/doc/501545390.html, = name;

}

public String getAuthor() {

return author;

}

public void setAuthor(String author) { this.author = author;

}

public float getPrice() {

return price;

}

public void setPrice(float price) { this.price = price;

}

public String getIsbn() {

return isbn;

}

public void setIsbn(String isbn) {

this.isbn = isbn;

}

public String getPubName() {

return pubName;

}

public void setPubName(String pubName) { this.pubName = pubName;

}

public byte[] getPreface() {

return preface;

}

public void setPreface(byte[] preface) {

this.preface = preface;

}

}

上面这两个类一目了然，就是两个简单的javabean风格的类。再看下面真正的重点类：

package org.leno.export.util;

import java.io.*;

import https://www.wendangku.net/doc/501545390.html,ng.reflect.*;

import java.util.*;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import java.text.SimpleDateFormat;

import javax.swing.JOptionPane;

import https://www.wendangku.net/doc/501545390.html,ermodel.*;

import org.apache.poi.hssf.util.HSSFColor;

/**

* 利用开源组件POI3.0.2动态导出EXCEL文档

* 转载时请保留以下信息，注明出处！

* @author leno

* @version v1.0

* @param 应用泛型，代表任意一个符合javabean风格的类

* 注意这里为了简单起见，boolean型的属性xxx的get器方式为getXxx(),而不是isXxx()

* byte[]表jpg格式的图片数据

*/

public class ExportExcel {

public void exportExcel(Collection dataset, OutputStream out) { exportExcel("测试POI导出EXCEL文档", null, dataset, out, "yyyy-MM-dd");

}

public void exportExcel(String[] headers, Collection dataset,

OutputStream out) {

exportExcel("测试POI导出EXCEL文档", headers, dataset, out, "yyyy-MM-dd");

}

public void exportExcel(String[] headers, Collection dataset,

OutputStream out, String pattern) {

exportExcel("测试POI导出EXCEL文档", headers, dataset, out, pattern);

}

/**

* 这是一个通用的方法，利用了JA V A的反射机制，可以将放置在JA V A 集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上*

* @param title

* 表格标题名

* @param headers

* 表格属性列名数组

* @param dataset

* 需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的

* javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)

* @param out

* 与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中

* @param pattern

* 如果有时间数据，设定输出格式。默认为"yyy-MM-dd"

*/

@SuppressWarnings("unchecked")

public void exportExcel(String title, String[] headers,

Collection dataset, OutputStream out, String pattern) {

// 声明一个工作薄

HSSFWorkbook workbook = new HSSFWorkbook();

// 生成一个表格

HSSFSheet sheet = workbook.createSheet(title);

// 设置表格默认列宽度为15个字节

sheet.setDefaultColumnWidth((short) 15);

// 生成一个样式

HSSFCellStyle style = workbook.createCellStyle();

// 设置这些样式

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);

// 生成一个字体

HSSFFont font = workbook.createFont();

font.setColor(HSSFColor.VIOLET.index);

font.setFontHeightInPoints((short) 12);

font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

// 把字体应用到当前的样式

style.setFont(font);

// 生成并设置另一个样式

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);

// 生成另一个字体

HSSFFont font2 = workbook.createFont();

font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);

// 把字体应用到当前的样式

style2.setFont(font2);

// 声明一个画图的顶级管理器

HSSFPatriarch patriarch = sheet.createDrawingPatriarch();

// 定义注释的大小和位置,详见文档

HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0, 0, 0, 0, (short) 4, 2, (short) 6, 5));

// 设置注释内容

comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));

// 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.

comment.setAuthor("leno");

//产生表格标题行

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);

}

//遍历集合数据，产生数据行

Iterator it = dataset.iterator();

int index = 0;

while (it.hasNext()) {

index++;

row = sheet.createRow(index);

T t = (T) it.next();

//利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值

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[] {});

//判断值的类型后进行强制类型转换

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[]) {

// 有图片时，设置行高为60px;

row.setHeightInPoints(60);

// 设置图片所在列宽度为80px,注意这里单位的一个换算

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{

//其它数据类型都当作字符串简单处理

textValue = value.toString();

}

//如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成

if(textValue!=null){

Pattern p = https://www.wendangku.net/doc/501545390.html,pile("^\\d+(\\.\\d+)?$");

Matcher matcher = p.matcher(textValue);

if(matcher.matches()){

//是数字当作double处理

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 {

//清理资源

}

}

}

try {

workbook.write(out);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public static void main(String[] args) {

// 测试学生

ExportExcel ex = new ExportExcel();

String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" };

List dataset = new ArrayList();

dataset.add(new Student(10000001, "张三", 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()));

// 测试图书

ExportExcel ex2 = new ExportExcel();

String[] headers2 = { "图书编号", "图书名称", "图书作者", "图书价格", "图书ISBN",

"图书出版社", "封面图片" };

List dataset2 = new ArrayList();

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",

"清华出版社", buf));

dataset2.add(new Book(2, "java编程思想", "brucl", 300.33f, "1234567",

"阳光出版社", buf));

dataset2.add(new Book(3, "DOM艺术", "lenotang", 300.33f, "1234567",

"清华出版社", buf));

dataset2.add(new Book(4, "c++经典", "leno", 400.33f, "1234567",

"清华出版社", buf));

dataset2.add(new Book(5, "c#入门", "leno", 300.33f, "1234567",

"汤春秀出版社", 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, "导出成功!");

System.out.println("excel导出成功！");

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}