POI导出EXCEL经典实现

转自：http://blog.csdn.net/lenotang/article/details/2823230
现在主流的操作Excel文件的开源工具有很多,用得比较多的就是Apache的POI及JExcelAPI。这里我们用Apache POI！我们先去Apache的大本营下载POI的jar包：http://poi.apache.org/ ，我这里使用的是3.0.2版本。

实体类Book：

package com.export.util;

public class Book
{
    private int bookId;
    
    private String name;
    
    private String author;
    
    private float price;
    
    private String isbn;
    
    private String pubName;
    
    private byte[] preface;
    
    public Book()
    {
        super();
    }
    
    public Book(int bookId, String name, String author, float price,
            String isbn, String pubName, byte[] preface)
    {
        this.bookId = bookId;
        this.author = author;
        this.name = name;
        this.price = price;
        this.isbn = isbn;
        this.pubName = pubName;
        this.preface = preface;
    }
    
    public int getBookId()
    {
        return bookId;
    }
    
    public void setBookId(int bookId)
    {
        this.bookId = bookId;
    }
    
    public String getName()
    {
        return name;
    }
    
    public void setName(String name)
    {
        this.name = name;
    }
    
    public String getAuthor()
    {
        return author;
    }
    
    public void setAuthor(String author)
    {
        this.author = author;
    }
    
    public float getPrice()
    {
        return price;
    }
    
    public void setPrice(float price)
    {
        this.price = price;
    }
    
    public String getIsbn()
    {
        return isbn;
    }
    
    public void setIsbn(String isbn)
    {
        this.isbn = isbn;
    }
    
    public String getPubName()
    {
        return pubName;
    }
    
    public void setPubName(String pubName)
    {
        this.pubName = pubName;
    }
    
    public byte[] getPreface()
    {
        return preface;
    }
    
    public void setPreface(byte[] preface)
    {
        this.preface = preface;
    }
    
}

实体类Student：

package com.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()
    {
        // TODO Auto-generated constructor stub
    }
    
    public Student(long id, String name, int age, boolean sex, Date birthday)
    {
        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;
    }
    
}

工具类ExportExcel：

package com.export.util;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
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.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JOptionPane;

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<T>
{
    /**
     * 导出excel
     * @param dataset 数据集合
     * @param out 输出文档
     */
    public void exportExcel(Collection<T> dataset, OutputStream out)
    {
        exportExcel("测试POI导出Excel文档", null, dataset, out, "yyyy-MM-dd");
    }
    
    /**
     * 导出excel
     * @param headers 字段头
     * @param dataset
     * @param out
     */
    public void exportExcel(String[] headers, Collection<T> dataset,
            OutputStream out)
    {
        exportExcel("测试POI导出EXCEL文档", headers, dataset, out, "yyyy-MM-dd");
    }
    
    /**
     * 导出excel
     * @param headers
     * @param dataset
     * @param out
     * @param pattern
     */
    public void exportExcel(String[] headers, Collection<T> dataset,

    OutputStream out, String pattern)
    {
        exportExcel("测试POI导出EXCEL文档", headers, dataset, out, pattern);
    }
    
    /**
     * 导出excel通用方法
     * @param title     表格标题
     * @param headers   表格属性列
     * @param dataset   需要显示的数据集合    
     * @param out       与输出设备关联的数据对象
     * @param pattern   如果有时间数据，设定输出格式。默认为"yyyy-MM-dd"
     */
    @SuppressWarnings( {"deprecation", "unchecked"})
    public void exportExcel(String title, String[] headers,
            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("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 fieldName = field.getName();
                String getMethodName = "get"
                        + fieldName.substring(0, 1).toUpperCase()
                        + fieldName.substring(1);
                Class tCls = t.getClass();
                try
                {
                    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 = String.valueOf(fValue);
                        cell.setCellValue(textValue);
                    }
                    else if (value instanceof Double)
                    {
                        double dValue = (Double)value;
                        textValue = 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
                    {
                        //其它数据类型都当作字符串简单处理
                        textValue = value.toString();
                    }
                    //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)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                catch (NoSuchMethodException e)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                catch (IllegalArgumentException e)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                catch (IllegalAccessException e)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    
                }
                catch (InvocationTargetException e)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                finally
                {
                    //清理资源
                }
            }
        }
        try
        {
            workbook.write(out);
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    //测试
    public static void main(String[] args)
    {
        // 测试学生
        ExportExcel<Student> ex = new ExportExcel<Student>();
        String[] headers = {"学号", "姓名", "年龄", "性别", "出生日期"};
        List<Student> dataset = new ArrayList<Student>();
        dataset.add(new Student(10000001, "张三", 20, true, new Date()));
        dataset.add(new Student(20000002, "李四", 24, false, new Date()));
        dataset.add(new Student(30000003, "王五", 22, true, new Date()));
        // 测试图书
        ExportExcel<Book> ex2 = new ExportExcel<Book>();
        String[] headers2 = {"图书编号", "图书名称", "图书作者", "图书价格", "图书ISBN", "图书出版社",
                "封面图片"};
        List<Book> dataset2 = new ArrayList<Book>();
        try
        {
            BufferedInputStream bis = new BufferedInputStream(
                    new FileInputStream(
                            new File(
                                    "C:\\Documents and Settings\\Administrator\\桌面\\book.jpg")));
            byte[] buf = new byte[bis.available()];
            while ((bis.read(buf)) != -1)
            {
                //
            }
            dataset2.add(new Book(1, "jsp", "leno", 300.33f, "1234567",
                    "清华出版社", buf));
            dataset2.add(new Book(2, "java编程思想", "brucl", 300.33f, "1234567",
                    "阳光出版社", buf));
            dataset2.add(new Book(3, "DOM艺术", "lenotang", 300.33f, "1234567",
                    "清华出版社", buf));
            dataset2.add(new Book(4, "c++经典", "leno", 400.33f, "1234567",
                    "清华出版社", buf));
            dataset2.add(new Book(5, "c#入门", "leno", 300.33f, "1234567",
                    "汤春秀出版社", buf));
            OutputStream out = new FileOutputStream("E://a.xls");
            OutputStream out2 = new FileOutputStream("E://b.xls");
            ex.exportExcel(headers, dataset, out);
            ex2.exportExcel(headers2, dataset2, out2);
            out.close();
            JOptionPane.showMessageDialog(null, "导出成功!");
            System.out.println("excel导出成功！");
        }
        catch (FileNotFoundException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}