java使用POI写Excel文件

参考地址：http://www.cnblogs.com/xwdreamer/archive/2011/07/20/2296975.html

1 jar包

　　网上下载

2 源代码

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);
        }

    }

}

3 测试代码

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();
        }
    }
}

4 测试结果

5 git地址

https://github.com/HelloAmy/JavaStudy.git