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;
/**
* 利用开源组件POI3.0.2动态导出EXCEL文档 转载时请保存以下信息，注明出处！
*
* @author leno
* @version v1.0
* @param <T>
* 利用泛型，代表任意1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
*/
class ExportExcel<T>
{
void exportExcel(Collection<T>
dataset,OutputStream out) {
exportExcel("测试POI导出EXCEL文档",255)">null,dataset,out,"yyyy-MM-dd"
);
}
void exportExcel(String[] headers,Collection<T>
dataset,headers,OutputStream out,String pattern) {
exportExcel("测试POI导出EXCEL文档"
,pattern);
}
* 这是1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1定条件的数据以EXCEL 的情势输出到指定IO装备上
*
* title
* 表格标题名
* headers
* 表格属性列名数组
* dataset
* 需要显示的数据集合,集合中1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)
* out
* 与输出装备关联的流对象，可以将EXCEL文档导出到本地文件或网络中
* pattern
* 如果有时间数据，设定输出格式。默许为"yyy-MM-dd"
*/
@SuppressWarnings("unchecked"
)
void exportExcel(String title,String[] headers,Collection<T>
dataset,String pattern) {
声明1个工作薄
HSSFWorkbook workbook =
new HSSFWorkbook();
生成1个表格
HSSFSheet sheet =
workbook.createSheet(title);
设置表格默许列宽度为15个字节
sheet.setDefaultColumnWidth((
short) 15
);
生成1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1个字体
HSSFFont font =
workbook.createFont();
font.setColor(HSSFColor.VIOLET.index);
font.setFontHeightInPoints((short) 12
);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
把字体利用到当前的样式
style.setFont(font);
生成并设置另外一个样式
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);
生成另外一个字体
HSSFFont font2 =
workbook.createFont();
font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
把字体利用到当前的样式
style2.setFont(font2);
声明1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,(
short) 4,2,255)">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<T> it =
dataset.iterator();
int index = 0
;
while (it.hasNext()) {
index++
;
row =
sheet.createRow(index);
T t =
(T) it.next();
利用反射，根据javabean属性的前后顺序，动态调用getXxx()方法得到属性值
Field[] fields =
t.getClass().getDeclaredFields();
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,255)">new
Object[] {});
判断值的类型落后行强迫类型转换
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;
String.valueOf(dValue));
} 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 instanceof Date) {
Date date =
(Date) value;
SimpleDateFormat sdf =
new SimpleDateFormat(pattern);
textValue =
sdf.format(date);
} 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1个换算
sheet.setColumnWidth(i,255)">short) (35.7 * 80
));
sheet.autoSizeColumn(i);
byte[] bsValue = (
byte[]) value;
HSSFClientAnchor anchor =
new HSSFClientAnchor(0,0
,1023,index,255)">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是不是全部由数字组成
if (textValue !=
null) {
Pattern p = Pattern.compile("^//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) {
catch (IllegalArgumentException e) {
catch (IllegalAccessException e) {
catch (InvocationTargetException e) {
finally {
清算资源
}
}
}
try {
workbook.write(out);
} catch (IOException e) {
TODO Auto-generated catch block
e.printStackTrace();
}
}
static void main(String[] args) {
测试学生
ExportExcel<Student> ex =
new ExportExcel<Student>
();
String[] headers = { "学号","姓名","年龄","性别","诞生日期"
};
List<Student> dataset =
new ArrayList<Student>
();
dataset.add(new Student(10000001,"张3",20,255)">true,255)">new
Date()));
dataset.add(new Student(20000002,"李4",24,255)">false,255)">new Student(30000003,"王5",22,255)">new
Date()));
测试图书
ExportExcel<Book> ex2 =
new ExportExcel<Book>
();
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<Book> dataset2 =
new ArrayList<Book>
();
try {
BufferedInputStream bis =
new BufferedInputStream(
new FileInputStream("book.jpg"
));
byte[] buf =
new byte[bis.available()];
while ((bis.read(buf)) != ⑴
) {
//
}
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","阳光出版社"
,255)">new Book(3,"DOM艺术","lenotang",255)">new Book(4,"c++经典",400.33f,255)">new Book(5,"c#入门","汤春秀出版社"
,buf));
OutputStream out =
new FileOutputStream("E://a.xls"
);
OutputStream out2 =
new FileOutputStream("E://b.xls"
);
ex.exportExcel(headers,out);
ex2.exportExcel(headers2,dataset2,out2);
out.close();
JOptionPane.showMessageDialog();
System.out.println("excel导出成功！"
);
} catch (FileNotFoundException e) {
TODO Auto-generated catch block
e.printStackTrace();
} TODO Auto-generated catch block
e.printStackTrace();
}
}
}
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