POI數據導出

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導出時標題顯示的名字，若是沒有設置Annotation屬性，將不會被導出和導入
public String exportName();
}

 

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導出時標題顯示的名字，若是沒有設置Annotation屬性，將不會被導出和導入
public String exportName();
}

private Integer id;
@ExcelAnnotation(exportName="入庫時間")
private Date moveTime;
@ExcelAnnotation(exportName="憑證號")
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) {

// 聲明一個工做薄

HSSFWorkbook workbook = new HSSFWorkbook();

// 生成一個表格

HSSFSheet sheet = workbook.createSheet(title);

// 設置表格默認列寬度爲15個字節

sheet.setDefaultColumnWidth((short) 15);

// 生成一個樣式

HSSFCellStyle style = workbook.createCellStyle();

// 設置這些樣式

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);

// 生成一個字體

HSSFFont font = workbook.createFont();

font.setColor(HSSFColor.VIOLET.index);

font.setFontHeightInPoints((short) 12);

font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

// 把字體應用到當前的樣式

style.setFont(font);

// 生成並設置另外一個樣式

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);

// 聲明一個畫圖的頂級管理器

HSSFPatriarch patriarch = sheet.createDrawingPatriarch();

// 定義註釋的大小和位置,詳見文檔

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

// 設置註釋內容

comment.setString(new HSSFRichTextString("能夠在POI中添加註釋！"));

// 設置註釋做者，當鼠標移動到單元格上是能夠在狀態欄中看到該內容.

comment.setAuthor("kht");
Iterator<T> its = dataset.iterator();
// 產生表格標題行
/*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);

} */

// 遍歷集合數據，產生數據行



int index = 0;

while (its.hasNext()) {

index++;

HSSFRow row = sheet.createRow(index);

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

// 利用反射，根據javabean屬性的前後順序，動態調用getXxx()方法獲得屬性值

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[] {});

// 判斷值的類型後進行強制類型轉換

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[]) {

// 有圖片時，設置行高爲60px;

row.setHeightInPoints(60);

// 設置圖片所在列寬度爲80px,注意這裏單位的一個換算

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 {

// 其它數據類型都看成字符串簡單處理

textValue = String.valueOf(value);

}

// 若是不是圖片數據，就利用正則表達式判斷textValue是否所有由數字組成

if (textValue != null) {

Pattern p = Pattern.compile("^\\d+(\\.\\d+)?$");

Matcher matcher = p.matcher(textValue);

if (matcher.matches()) {

// 是數字看成double處理

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 {
// 清理資源
}

}

}
try {
workbook.write(out);

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

}

}
}