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 org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFComment;
import org.apache.poi.xssf.usermodel.XSSFDrawing;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import com.jy.modules.platform.sysorg.dto.ModifyPwdVO;
import com.jy.modules.platform.sysorg.dto.SysOrgDTO;

@SuppressWarnings("all")
public class ExportExcel {

public String exportExcel(String sheetTitle,Collection<T> dataset, OutputStream out) {  
    return exportExcel(sheetTitle, null, dataset, out, "yyyy-MM-dd");  
}

public String exportExcel(String sheetTitle,String\[\] headers, Collection<T> dataset,  
        OutputStream out) {  
    return exportExcel(sheetTitle, headers, dataset, out, "yyyy-MM-dd");  
}

/**
* 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
*
* @param title
* 表格标题名
* @param headers
* 表格属性列名数组
* @param dataset
* 需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
* javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
* @param out
* 与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
* @param pattern
* 如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
*/

@SuppressWarnings("unchecked")  
public String exportExcel(String title, String\[\] headers,  
        Collection<T> dataset, OutputStream out, String pattern) {  
    String state = "fail";  
    // 声明一个工作薄  
    XSSFWorkbook workbook = new XSSFWorkbook();  
    // 生成一个表格  
    XSSFSheet sheet = workbook.createSheet(title);  
    // 设置表格默认列宽度为15个字节  
    sheet.setDefaultColumnWidth(12);  
    // 生成一个样式  
    XSSFCellStyle style = workbook.createCellStyle();  
    // 设置这些样式  
    style.setFillForegroundColor(HSSFColor.GREEN.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  
    XSSFFont font = workbook.createFont();  
    font.setFontName(HSSFFont.FONT\_ARIAL);  
    font.setColor(HSSFColor.BLACK.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  
    XSSFCellStyle 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  
    XSSFFont 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  
    XSSFDrawing patriarch = sheet.createDrawingPatriarch();  
    // 定义注释的大小和位置,详见文档  
    /\*XSSFComment comment = patriarch.createCellComment(new XSSFClientAnchor(0,  
            0, 0, 0, (short) 4, 2, (short) 6, 5));  
    // 设置注释内容  
    comment.setString(new XSSFRichTextString("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  
    XSSFRow row;  
    int index = 0;  
    if(headers!=null){  
        row = sheet.createRow(0);  
        index++;  
        for (short i = 0; i < headers.length; i++) {  
            XSSFCell cell = row.createCell(i);  
            cell.setCellStyle(style);  
            XSSFRichTextString text = new XSSFRichTextString(headers\[i\]);  
            cell.setCellValue(text);  
        }  
    }

    Iterator<T> itt = dataset.iterator();  
    boolean columnTitle =false;  
    while (itt.hasNext()) {  
        row = sheet.createRow(index);  
        index++;  
        T t = (T) itt.next();  
        Field\[\] fields = t.getClass().getDeclaredFields();  
        int titleIndex = 0;  
        for (short i = 0; i < fields.length; i++) {  
            Field field = fields\[i\];  
            String fieldName = field.getName();  
            if("serialVersionUID".equals(fieldName)){  
                continue;  
            }else{  
                XSSFCell cell = row.createCell(titleIndex);  
                titleIndex++;  
                cell.setCellStyle(style);  
                cell.setCellValue(fieldName);  
            }  
        }  
        break;  
    }  
    itt = null;  
    Iterator<T> it = dataset.iterator();  
    // 遍历集合数据，产生数据行  
    while (it.hasNext()) {  
        row = sheet.createRow(index);  
        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();  
        int cellIndex = 0;  
        for (short i = 0; i < fields.length; i++) {  
            Field field = fields\[i\];  
            String fieldName = field.getName();  
            if("serialVersionUID".equals(fieldName)){  
                continue;  
            }

            XSSFCell cell = row.createCell(cellIndex);  
            cellIndex++;  
            String getMethodName = "get"  
                    + fieldName.substring(0, 1).toUpperCase()  
                    + fieldName.substring(1);

            try {  
                Class tCls = t.getClass();  
                Method getMethod = tCls.getMethod(getMethodName,  
                        new Class\[\] {});  
                Object value = getMethod.invoke(t, new Object\[\] {});  
                if(value == null){  
                    continue;  
                }  
                cell.setCellStyle(style2);  
                // 判断值的类型后进行强制类型转换  
                String textValue = null;  
                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 {  
                        XSSFRichTextString richString = new XSSFRichTextString(  
                                textValue);  
                        XSSFFont font3 = workbook.createFont();  
                        font3.setColor(HSSFColor.BLUE.index);  
                        richString.applyFont(font3);  
                        cell.setCellValue(richString);  
                    }  
                }  
            } catch (SecurityException e) {  
                e.printStackTrace();  
            } catch (NoSuchMethodException e) {  
                e.printStackTrace();  
            } catch (IllegalArgumentException e) {  
                e.printStackTrace();  
            } catch (IllegalAccessException e) {  
                e.printStackTrace();  
            } catch (InvocationTargetException e) {  
                e.printStackTrace();  
            }  
        }  
    }  
    try {  
        workbook.write(out);  
        state = "succes";  
    } catch (IOException e) {  
        e.printStackTrace();  
    }finally{  
        try {  
            out.close();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return state;  
    }  
}  

}

public static void main(String[] args) throws FileNotFoundException {
// TODO Auto-generated method stub
ExportExcel ex = new ExportExcel();
List dataset = new ArrayList();
for(int i =0;i<8;i++){
test dto = new test();
dto.setUsername("9999");
dto.setPassword("hahahah ");
dto.setNewpwd("111");
dto.setSource("66666");
dataset.add(dto);
}
OutputStream out = new FileOutputStream("E://a.xlsx");
//ex.exportExcel("机构导出",dataset,out);
String header[] = new String[]{"ID","机构编码","机构名称","机构类型"};
ex.exportExcel("机构导出",header,dataset,out);
}