1、POI导出EXCELPOI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:http:/poi.apa
2、che.org/ ,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 Stri
3、ng 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; this.name = name; this.age = age; this.sex = sex; this.birthday = bi
4、rthday; public long getId() return id; public void setId(long id) this.id = id; public String getName() return name; public void setName(String name) this.name = name; public int getAge() return age; public void setAge(int age) this.age = age; public boolean getSex() return sex; public void setSex(b
5、oolean 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 St
6、ring 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; this.name = name; this.author = author; this.price = price; this.isbn = isbn; this.pubName = pubName;
7、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) this.name = name; public String getAuthor() return author; public void setAuthor(String author) this.author = au
8、thor; 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 b
9、yte 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 java.lang.reflect.*;import java.util.*;import java.util.regex.Matcher;import java.util.regex.Pattern;import ja
10、va.text.SimpleDateFormat;import javax.swing.JOptionPane;import org.apache.poi.hssf.usermodel.*;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is
11、Xxx() * 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, ou
12、t, 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JAVA的反射机制,可以将放置在JAVA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 * par
13、am 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 datas
14、et, 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.setFillForegroundCol
15、or(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(HSS
16、FCellStyle.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(); sty
17、le2.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.BOR
18、DER_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 = she
19、et.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
20、= sheet.createRow(0); for (short i = 0; i headers.length; i+) HSSFCell cell = row.createCell(i); cell.setCellStyle(style); HSSFRichTextString text = new HSSFRichTextString(headersi); 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+; r
21、ow = 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 = fieldsi; String fieldName = field.getName(
22、); 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 instanc
23、eof 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) va
24、lue;/ 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
25、; 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); / she
26、et.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 textV
27、alue = 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 = Ppile(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(t
28、extValue); 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.
29、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();
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