java使用POI写Excel文件

package zjr.amy.excel;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
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.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;

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;

/**
* Excel工具类
* @author zhujinrong
*
* @param <T> 泛型T
*/
public class ExcelUtil<T> {

/**
* 写入数据到Excel中
* @param dataset 数据
* @param fileName 文件名
* @throws FileNotFoundException
*/
public void writeData(Collection<T> dataset, String fileName) throws FileNotFoundException {
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
String temp = sdf.format(date);
this.writeData("测试文档" + temp, null, dataset, fileName, "yyyy-MM-dd");
}

/**
* 写入数据到Excel中
* @param headers 表头
* @param dataset 数据
* @param fileName 文件名
* @throws FileNotFoundException
*/
public void writeData(String[] headers, Collection<T> dataset,
String fileName) throws FileNotFoundException {
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
String temp = sdf.format(date);
this.writeData("测试文档" + temp, headers, dataset, fileName, "yyyy-MM-dd");
}

/**
* 写入数据到Excel中
* @param headers 表头
* @param dataset 数据
* @param fileName 文件名
* @param pattern 日期处理格式
* @throws FileNotFoundException 找不到文件
*/
public void writeData(String[] headers, Collection<T> dataset,
String fileName, String pattern) throws FileNotFoundException {
this.writeData("测试文档", headers, dataset, fileName, pattern);
}

/**
* 写入数据到Excel
* @param title sheet名
* @param headers 表头
* @param dataset 数据
* @param fileName 文件名
* @param pattern 日期处理格式
* @throws FileNotFoundException 找不到文件
*/
public void writeData(String title, String[] headers,
Collection<T> dataset, String fileName, String pattern) throws FileNotFoundException {

OutputStream out;
out = new FileOutputStream(fileName);
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();

// 生成一个表格
HSSFSheet sheet = workbook.createSheet();

// 设置表格默认宽度为15个字节
sheet.setDefaultColumnWidth(15);

// 设置Sheet名
workbook.setSheetName(0,title);

// 生成和设置表头样式
HSSFCellStyle headStyle = workbook.createCellStyle();
headStyle.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
headStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
headStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
headStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
headStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
headStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
headStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);

// 生成一个字体
HSSFFont headFont = workbook.createFont();
headFont.setColor(HSSFColor.VIOLET.index);
headFont.setFontHeightInPoints((short) 12);
headFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

// 把字体应用到当前的样式
headStyle.setFont(headFont);

// 生成另一种样式
HSSFCellStyle style2 = workbook.createCellStyle();

// 设置这些样式
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);

// 生成另一种字体
HSSFFont font2 = workbook.createFont();
font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);

// 把字体应用到当前样式
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));
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看到的
comment.setAuthor("amy");

// 创建标题列
HSSFRow row = sheet.createRow(0);
if (headers != null) {
for (int i = 0; i < headers.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellStyle(headStyle);
HSSFRichTextString text = new HSSFRichTextString(headers[i]);
cell.setCellValue(text);
}
}
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java本属性的先后顺序，动态调用getX()方法得到属性值
Field[] fields = t.getClass().getDeclaredFields();
for (int 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<? extends Object> tcls = t.getClass();
Method getMethod = tcls.getMethod(getMethodName,
new Class[] {});
Object value = getMethod.invoke(t, new Object[] {});
this.setCellValue(cell, value, pattern, patriarch);
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

try {
workbook.write(out);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void setCellValue(HSSFCell cell, Object value, String pattern,
HSSFPatriarch patriarch) {
// 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 floatValue = (float) value;
HSSFRichTextString txtValue = new HSSFRichTextString(
String.valueOf(floatValue));
cell.setCellValue(txtValue);
} else if (value instanceof Double) {
double dValue = (double) value;
HSSFRichTextString txtValue = new HSSFRichTextString(
String.valueOf(dValue));
cell.setCellValue(txtValue);
} else if (value instanceof Long) {
long lValue = (long) value;
HSSFRichTextString txtValue = new HSSFRichTextString(
String.valueOf(lValue));
cell.setCellValue(txtValue);
} else if (value instanceof Boolean) {
boolean bValue = (boolean) value;
textValue = "否";
if (bValue) {
textValue = "是";
}
cell.setCellValue(textValue);
} else if (value instanceof Date) {
Date date = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
textValue = sdf.format(date);
cell.setCellValue(textValue);
} else if (value instanceof byte[]) {
// 有图片时，设置行高为60px;
cell.getRow().setHeightInPoints(60);

// 设置图片所在列宽度为80px,注意这里单位的一个换算
cell.getRow().getSheet()
.setColumnWidth(cell.getColumnIndex(), (int) (35.7 * 80));

byte[] bsValue = (byte[]) value;
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 255,
(short) 6, cell.getRowIndex(), (short) 6,
cell.getRowIndex());
anchor.setAnchorType(2);
patriarch.createPicture(anchor, cell.getSheet().getWorkbook()
.addPicture(bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));

} else if (value instanceof Calendar) {
Calendar cValue = (Calendar) value;
int month = (cValue.get(Calendar.MONTH) + 1);
String monthStr = "";
if (month < 10) {
monthStr = "0" + month;
} else {
monthStr = month + "";
}
String txtValue = cValue.get(Calendar.YEAR) + "/"
+ monthStr + "/"
+ cValue.get(Calendar.DAY_OF_MONTH);
cell.setCellValue(txtValue);
} else {
// 其他数据都当做字符串简单处理
textValue = value.toString();
cell.setCellValue(textValue);
}

}

}

package zjr.amy.excel.test;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

import zjr.amy.excel.ExcelHelper;
import zjr.amy.excel.ExcelUtil;
import zjr.amy.model.Person;

public class TestExcelHelper {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
TestDataModel();
}

　　public static void TestDataModel() {
Person p = new Person();
p.setKeyID("1212121212");
p.setSex("男");
Calendar date = Calendar.getInstance();
date.set(2000, 1, 15);
p.setBirth(date);
p.setName("张三");

List<Person> list = new ArrayList<Person>();
list.add(p);
p = new Person();
p.setKeyID("1212121212");
p.setSex("女");
date = Calendar.getInstance();
date.set(2000, 12, 25);
p.setBirth(date);
p.setName("丽丽");
list.add(p);
ExcelUtil<Person> bll = new ExcelUtil<Person>();
String[] headers = { "主键", "性别", "姓名", "出生年月" };
try {
bll.writeData(headers, list, "doc/Person.xls");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}