POI数据导出

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ExcelAnnotation {
// excel导出时标题显示的名字，如果没有设置Annotation属性，将不会被导出和导入
public String exportName();
}

private Integer id;
@ExcelAnnotation(exportName="入库时间")
private Date moveTime;
@ExcelAnnotation(exportName="凭证号")
private String credenceNum;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.poi.hssf.record.formula.functions.T;
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 ExportExcel {
@SuppressWarnings({ "deprecation", "unchecked" })
public void exportExcel(String title,

Collection<T> 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("kht");
Iterator<T> its = dataset.iterator();
// 产生表格标题行
/*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

int index = 0;

while (its.hasNext()) {

index++;

HSSFRow row = sheet.createRow(index);

T t = (T) its.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 if (value instanceof Double) {

double dValue = (Double) value;

textValue =String.valueOf(dValue);

cell.setCellValue(textValue);

}
else {

// 其它数据类型都当作字符串简单处理

textValue = String.valueOf(value);

}

// 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 = 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) {
e.printStackTrace();

} catch (NoSuchMethodException e) {
e.printStackTrace();

} catch (IllegalArgumentException e) {
e.printStackTrace();

} catch (IllegalAccessException e) {
e.printStackTrace();

} catch (InvocationTargetException e) {
e.printStackTrace();

} finally {
// 清理资源
}

}

}
try {
workbook.write(out);

} catch (IOException e) {
e.printStackTrace();

}

}
}