工具類程式碼PoiExcelExport如下：

package com.myssm.util.poi;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;

public class PoiExcelExport {
	HttpServletResponse response;
	// 檔名
	private String fileName ;
	//檔案儲存路徑
	private String fileDir;
	//sheet名
	private String sheetName;
	//表頭字型
	private String titleFontType = "Arial Unicode MS";
	//表頭背景色
	private String titleBackColor = "C1FBEE";
	//表頭字號
	private short titleFontSize = 12;
	//新增自動篩選的列 如 A:M
	private String address = "";
	//正文字型
	private String contentFontType = "Arial Unicode MS";
	//正文字號
	private short contentFontSize = 12;
	//Float型別資料小數位
	private String floatDecimal = ".00";
	//Double型別資料小數位
	private String doubleDecimal = ".00";
	//設定列的公式
	private String colFormula[] = null;
	
	DecimalFormat floatDecimalFormat=new DecimalFormat(floatDecimal);
	DecimalFormat doubleDecimalFormat=new DecimalFormat(doubleDecimal);
	
	private HSSFWorkbook workbook = null;
	
	public PoiExcelExport(String fileDir,String sheetName){
	     this.fileDir = fileDir;
	     this.sheetName = sheetName;
	     workbook = new HSSFWorkbook();
	}
	
	public PoiExcelExport(HttpServletResponse response,String fileName,String sheetName){
		 this.response = response;
		 this.sheetName = sheetName;
	     workbook = new HSSFWorkbook();
	}
    /**
     * 設定表頭字型.
     * @param titleFontType
     */
	public void setTitleFontType(String titleFontType) {
		this.titleFontType = titleFontType;
	}
    /**
     * 設定表頭背景色.
     * @param titleBackColor 十六進位制
     */
	public void setTitleBackColor(String titleBackColor) {
		this.titleBackColor = titleBackColor;
	}
    /**
     * 設定表頭字型大小.
     * @param titleFontSize
     */
	public void setTitleFontSize(short titleFontSize) {
		this.titleFontSize = titleFontSize;
	}
    /**
     * 設定表頭自動篩選欄位,如A:AC.
     * @param address
     */
	public void setAddress(String address) {
		this.address = address;
	}
    /**
     * 設定正文字型.
     * @param contentFontType
     */
	public void setContentFontType(String contentFontType) {
		this.contentFontType = contentFontType;
	}
    /**
     * 設定正文字號.
     * @param contentFontSize
     */
	public void setContentFontSize(short contentFontSize) {
		this.contentFontSize = contentFontSize;
	}
	/**
	 * 設定float型別資料小數位 預設.00
	 * @param doubleDecimal 如 ".00"
	 */
    public void setDoubleDecimal(String doubleDecimal) {
		this.doubleDecimal = doubleDecimal;
	}
	/**
     * 設定doubel型別資料小數位 預設.00
     * @param floatDecimalFormat 如 ".00
     */
	public void setFloatDecimalFormat(DecimalFormat floatDecimalFormat) {
		this.floatDecimalFormat = floatDecimalFormat;
	}
	/**
	 * 設定列的公式 
	 * @param colFormula  儲存i-1列的公式 涉及到的行號使用@替換 如
 
[email protected][email protected]
	 */
	public void setColFormula(String[] colFormula) {
		this.colFormula = colFormula;
	}
	/**
     * 寫excel.
     * @param titleColumn  對應bean的屬性名
     * @param titleName   excel要匯出的表名
     * @param titleSize   列寬
     * @param dataList  資料
     */
	public void wirteExcel(String titleColumn[],String titleName[],int titleSize[],List<?> dataList){
    	//新增Worksheet（不新增sheet時生成的xls檔案開啟時會報錯)
    	Sheet sheet = workbook.createSheet(this.sheetName);  
    	//新建檔案
    	OutputStream out = null;
    	try {	 
    		if(fileDir!=null){
    			//有檔案路徑
    			out = new FileOutputStream(fileDir);    			
    		}else{
    			//否則，直接寫到輸出流中
    			out = response.getOutputStream();
    			fileName = fileName+".xls";
    			response.setContentType("application/x-msdownload");
    			response.setHeader("Content-Disposition", "attachment; filename="
    					+ URLEncoder.encode(fileName, "UTF-8"));
    		}
    		
    		//寫入excel的表頭
    		Row titleNameRow = workbook.getSheet(sheetName).createRow(0); 
    		//設定樣式
    		HSSFCellStyle titleStyle = workbook.createCellStyle();  
    		titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, titleFontType, (short) titleFontSize);
	    	titleStyle = (HSSFCellStyle) setColor(titleStyle, titleBackColor, (short)10);
    		
    		for(int i = 0;i < titleName.length;i++){
	    		sheet.setColumnWidth(i, titleSize[i]*256);    //設定寬度   		
	    		Cell cell = titleNameRow.createCell(i);
	    		cell.setCellStyle(titleStyle);
	    		cell.setCellValue(titleName[i].toString());
	    	}
	    	
	    	//為表頭新增自動篩選
	    	if(!"".equals(address)){
				CellRangeAddress c = (CellRangeAddress) CellRangeAddress.valueOf(address);
		    	sheet.setAutoFilter(c);
			}
	    	
	    	//通過反射獲取資料並寫入到excel中
	    	if(dataList!=null&&dataList.size()>0){
	    		//設定樣式
	    		HSSFCellStyle dataStyle = workbook.createCellStyle();  
	    		titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, contentFontType, (short) contentFontSize);
	    		
	    		if(titleColumn.length>0){
	    	    	for(int rowIndex = 1;rowIndex<=dataList.size();rowIndex++){
	    	    		Object obj = dataList.get(rowIndex-1);     //獲得該物件
	    	    		Class clsss = obj.getClass();     //獲得該對物件的class例項
	    	    		Row dataRow = workbook.getSheet(sheetName).createRow(rowIndex);    
	    	    		for(int columnIndex = 0;columnIndex<titleColumn.length;columnIndex++){
	    	    			String title = titleColumn[columnIndex].toString().trim();
	    	    			if(!"".equals(title)){  //欄位不為空
	    	    				//使首字母大寫
								String UTitle = Character.toUpperCase(title.charAt(0))+ title.substring(1, title.length()); // 使其首字母大寫;
								String methodName  = "get"+UTitle;
								
								// 設定要執行的方法
								Method method = clsss.getDeclaredMethod(methodName); 
								
								//獲取返回型別
								String returnType = method.getReturnType().getName(); 
								
								String data = method.invoke(obj)==null?"":method.invoke(obj).toString();
								Cell cell = dataRow.createCell(columnIndex);
								if(data!=null&&!"".equals(data)){
									if("int".equals(returnType)){
										cell.setCellValue(Integer.parseInt(data));
									}else if("long".equals(returnType)){
										cell.setCellValue(Long.parseLong(data));
									}else if("float".equals(returnType)){
										cell.setCellValue(floatDecimalFormat.format(Float.parseFloat(data)));
									}else if("double".equals(returnType)){
										cell.setCellValue(doubleDecimalFormat.format(Double.parseDouble(data)));
									}else{
										cell.setCellValue(data);
									}
								}
	    	    			}else{   //欄位為空 檢查該列是否是公式
	    	    				if(colFormula!=null){
	    	    					String sixBuf = colFormula[columnIndex].replace("@", (rowIndex+1)+"");
	    	    					Cell cell = dataRow.createCell(columnIndex);
	    	    					cell.setCellFormula(sixBuf.toString());
	    	    				}
	    	    			}
		    	    	}
	    	    	}
	    	    	
	    	    }
	    	}
	    	
			workbook.write(out);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {  
		    try {
				out.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}  
	}
	
    /**
     * 將16進位制的顏色程式碼寫入樣式中來設定顏色
     * @param style  保證style統一
     * @param color 顏色：66FFDD
     * @param index 索引 8-64 使用時不可重複
     * @return
     */
    public CellStyle setColor(CellStyle style,String color,short index){
    	if(color!=""&&color!=null){
			//轉為RGB碼
    		int r = Integer.parseInt((color.substring(0,2)),16);   //轉為16進位制
    		int g = Integer.parseInt((color.substring(2,4)),16);
    		int b = Integer.parseInt((color.substring(4,6)),16);
    		//自定義cell顏色
    		HSSFPalette palette = workbook.getCustomPalette(); 
    		palette.setColorAtIndex((short)index, (byte) r, (byte) g, (byte) b);
    	
    		style.setFillPattern(CellStyle.SOLID_FOREGROUND); 
    		style.setFillForegroundColor(index);
		}
        return style;	
    }
   
    /**
     * 設定字型並加外邊框
     * @param style  樣式
     * @param style  字型名
     * @param style  大小
     * @return
     */
    public CellStyle setFontAndBorder(CellStyle style,String fontName,short size){
    	HSSFFont font = workbook.createFont();  
        font.setFontHeightInPoints(size);    
        font.setFontName(fontName); 
        font.setBold(true);
        style.setFont(font);
        style.setBorderBottom(CellStyle.BORDER_THIN); //下邊框    
        style.setBorderLeft(CellStyle.BORDER_THIN);//左邊框    
        style.setBorderTop(CellStyle.BORDER_THIN);//上邊框    
        style.setBorderRight(CellStyle.BORDER_THIN);//右邊框   
        return style;
    }
	/**
	 * 刪除檔案
	 * @param fileDir
	 * @return
	 */
    public boolean deleteExcel(){
    	boolean flag = false;
    	File file = new File(this.fileDir);
    	// 判斷目錄或檔案是否存在  
        if (!file.exists()) {  // 不存在返回 false  
            return flag;  
        } else {  
            // 判斷是否為檔案  
            if (file.isFile()) {  // 為檔案時呼叫刪除檔案方法  
                file.delete();
                flag = true;
            } 
        }
        return flag;
    }
    /**
	 * 刪除檔案
	 * @param fileDir
	 * @return
	 */
    public boolean deleteExcel(String path){
    	boolean flag = false;
    	File file = new File(path);
    	// 判斷目錄或檔案是否存在  
        if (!file.exists()) {  // 不存在返回 false  
            return flag;  
        } else {  
            // 判斷是否為檔案  
            if (file.isFile()) {  // 為檔案時呼叫刪除檔案方法  
                file.delete();
                flag = true;
            } 
        }
        return flag;
    }
}
 

實體bean:

package com.myssm.util.poi;

public class Man {
	private String name;
	private int sex;
	private String idCard;
	private float salary;
	public Man(String name, int sex, String idCard, float salary) {
		super();
		this.name = name;
		this.sex = sex;
		this.idCard = idCard;
		this.salary = salary;
	}
	
	public Man() {
		super();
	}

	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getSex() {
		return sex;
	}
	public void setSex(int sex) {
		this.sex = sex;
	}
	public String getIdCard() {
		return idCard;
	}
	public void setIdCard(String idCard) {
		this.idCard = idCard;
	}
	public float getSalary() {
		return salary;
	}
	public void setSalary(float salary) {
		this.salary = salary;
	}
	

}
 

package com.myssm.util.poi;

import java.util.ArrayList;
import java.util.List;

public class Test {

	public static void main(String[] args) {
		PoiExcelExport pee = new PoiExcelExport("E:/test.xls","sheet1");
		//資料
        List<Man> dataList = new ArrayList();
        Man man1 = new Man("張三",20,"男",(float)10000.8);
        Man man2 = new Man("李四",21,"男",(float)11000.8);
        Man man3 = new Man("王五",22,"女",(float)1200.8);
        Man man4 = new Man("趙六",23,"男",(float)13000.8);
        Man man5 = new Man("田七",24,"男",(float)14000.8);
        Man man6 = new Man();
        man6.setName("老八");
        dataList.add(man1);dataList.add(man2);dataList.add(man3);dataList.add(man4);dataList.add(man5);
        dataList.add(man6);
        //呼叫
        String titleColumn[] = {"name","sex","idCard","salary",""};
        String titleName[] = {"姓名","性別","身份證號","月薪","年薪"};
        int titleSize[] = {13,13,13,13,13};
        //其他設定 set方法可全不呼叫
        String colFormula[] = new String[5];
        colFormula[4] = "[email protected]*12";   //設定第5列的公式
        pee.setColFormula(colFormula);
        pee.setAddress("A:D");  //自動篩選 
        
        pee.wirteExcel(titleColumn, titleName, titleSize, dataList);
	}

}