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 = http://www.mamicode.com/null;                    if (value instanceof Boolean) {                        boolean bValue =http://www.mamicode.com/ (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        }    }}