java Export Excel POI 转

package org.leno.export.util;import java.util.Date;public class Student {
private long id;
private String 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 = birthday;
} 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(boolean sex) {
this.sex = sex;
} public Date getBirthday() {
return birthday;
} public void setBirthday(Date birthday) {
this.birthday = birthday;
}}

package myExcel;import java.awt.List;
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.*;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;import javax.mail.Header;
import javax.swing.JOptionPane;
import javax.swing.plaf.synth.Region;import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.formula.functions.T;import classman.class_operation;
import util.stringUtil;public class myExcelExcel<T> {
public void exportExcel(Collection<T> dataset, OutputStream out) {
exportExcel("testPOI", null, dataset, out, "yyyy-MM-dd");
} public void exportExcel(String[] headers, Collection<T> dataset,
OutputStream out) {
exportExcel("testPOI", headers, dataset, out, "yyyy-MM-dd");
} public void exportExcel(String[] headers, Collection<T> dataset,
OutputStream out, String pattern) {
exportExcel("testPOI", headers, dataset, out, pattern); } public void exportExcel(String title, String[] headers,
Collection<T> dataset, OutputStream out, String pattern) {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet(title);
sheet.setDefaultColumnWidth((short) 15);
HSSFCellStyle style = workbook.createCellStyle();
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); HSSFFont font = workbook.createFont();
font.setColor(HSSFColor.VIOLET.index);
font.setFontHeightInPoints((short) 12);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); style.setFont(font); 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); style2.setFont(font2); HSSFPatriarch patriarch = sheet.createDrawingPatriarch(); 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！"));
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 fileName = field.getName();
String getMethodName = "get"
+ fileName.substring(0, 1).toUpperCase()
+ fileName.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 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[]) { } else {
textValue=value.toString(); }
System.out.println(textValue);
if (textValue != null) {
Pattern p = Pattern.compile("^//d+(//.//d+)?$");
Matcher matcher = p.matcher(textValue);
if (matcher.matches()) {
cell.setCellValue(Double.parseDouble(textValue));
} else {
HSSFRichTextString richTextString = new HSSFRichTextString(
textValue);
HSSFFont font3 = workbook.createFont();
font3.setColor(HSSFColor.BLUE.index);
richTextString.applyFont(font3);
cell.setCellValue(richTextString);
}
} } catch (SecurityException e) {
// TODO: handle exception
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO: handle exception
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO: handle exception
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO: handle exception
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO: handle exception
e.printStackTrace();
} finally {
// 清理资源
}
}
} try {
workbook.write(out); } catch (IOException e) {
// TODO: handle exception
e.printStackTrace();
}
} public void testMain() { String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" };
myExcelExcel<Student> ex=new myExcelExcel<Student>();
java.util.List<Student> dataset = new ArrayList<Student>();
dataset.add(new Student(100001, "aa", 20, true, new java.util.Date()));
dataset.add(new Student(2002, "bbb", 24, false, new java.util.Date()));
dataset.add(new Student(3003, "ccc", 22, true, new java.util.Date()));
try { OutputStream out = new FileOutputStream("c://a.xls");
ex.exportExcel(headers, dataset,out);
out.close();
JOptionPane.showMessageDialog(null, "export OK!");
System.out.println("export OK");
} catch (FileNotFoundException e) {
e.printStackTrace();
// TODO: handle exception
}
catch (IOException e) {
e.printStackTrace();
// TODO: handle exception
} }
}

package brda;import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class ExportSvlt extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//File file = new File(getServletContext().getRealPath(""));
response.setContentType("octets/stream");
response.addHeader("Content-Disposition",
"attachment;filename=test.xls"); String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" };
brdaExcel<Student> ex=new brdaExcel<Student>();
java.util.List<Student> dataset = new ArrayList<Student>();
dataset.add(new Student(100001, "aa", 20, true, new java.util.Date()));
dataset.add(new Student(2002, "bbb", 24, false, new java.util.Date()));
dataset.add(new Student(3003, "ccc", 22, true, new java.util.Date())); OutputStream out = response.getOutputStream();
ex.exportExcel(headers, dataset, out);
out.close();
System.out.println("excel Export success!");
}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
doGet(request, response);
}}

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="ExportSvlt" method="post">
<input type="submit" value="ExportExcel">
</form>
</body>
</html>