Java实现导出excel

package demo;

import java.io.OutputStream;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.format.VerticalAlignment;
import jxl.write.Label;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
/*** 
 * @author lsf 
 */  
public class ExportExcel {  
 /**
  * @param fileName EXCEL文件名称 
  * @param listTitle EXCEL文件第一行列标题集合 
  * @param listContent EXCEL文件正文数据集合 
  * @return 
  */  
 public  final static String exportExcel(HttpServletResponse response,String fileName,String[] Title, List<Object> listContent) {  
  String result="系统提示：Excel文件导出成功！";    
  // 以下开始输出到EXCEL  
  try {      
   //定义输出流，以便打开保存对话框______________________begin  
//   HttpServletResponse response=ServletActionContext.getResponse();  
   OutputStream os = response.getOutputStream();// 取得输出流        
   response.reset();// 清空输出流        
   response.setHeader("Content-disposition", "attachment; filename="+ new String(fileName.getBytes("GB2312"),"ISO8859-1"));  
// 设定输出文件头        
   response.setContentType("application/msexcel");// 定义输出类型      
   //定义输出流，以便打开保存对话框_______________________end  
  
   /** **********创建工作簿************ */  
   WritableWorkbook workbook = Workbook.createWorkbook(os);  
  
   /** **********创建工作表************ */  
   WritableSheet sheet = workbook.createSheet("Sheet1", 0);  
  
   /** **********设置纵横打印（默认为纵打）、打印纸***************** */  
   jxl.SheetSettings sheetset = sheet.getSettings();  
   sheetset.setProtected(false);  
  
   /** ************设置单元格字体************** */  
   WritableFont NormalFont = new WritableFont(WritableFont.ARIAL, 10);  
   WritableFont BoldFont = new WritableFont(WritableFont.ARIAL, 10,WritableFont.BOLD);  
  
   /** ************以下设置三种单元格样式，灵活备用************ */  
   // 用于标题居中  
   WritableCellFormat wcf_center = new WritableCellFormat(BoldFont);  
   wcf_center.setBorder(Border.ALL, BorderLineStyle.THIN); // 线条  
   wcf_center.setVerticalAlignment(VerticalAlignment.CENTRE); // 文字垂直对齐  
   wcf_center.setAlignment(Alignment.CENTRE); // 文字水平对齐  
   wcf_center.setWrap(false); // 文字是否换行  
     
   // 用于正文居左  
   WritableCellFormat wcf_left = new WritableCellFormat(NormalFont);  
   wcf_left.setBorder(Border.NONE, BorderLineStyle.THIN); // 线条  
   wcf_left.setVerticalAlignment(VerticalAlignment.CENTRE); // 文字垂直对齐  
   wcf_left.setAlignment(Alignment.LEFT); // 文字水平对齐  
   wcf_left.setWrap(false); // 文字是否换行     
   
  
   /** ***************以下是EXCEL开头大标题，暂时省略********************* */  
   //sheet.mergeCells(0, 0, colWidth, 0);  
   //sheet.addCell(new Label(0, 0, "XX报表", wcf_center));  
   /** ***************以下是EXCEL第一行列标题********************* */  
   for (int i = 0; i < Title.length; i++) {  
    sheet.addCell(new Label(i, 0,Title[i],wcf_center));  
   }     
   /** ***************以下是EXCEL正文数据********************* */  
   Field[] fields=null;  
   int i=1;  
   for(Object obj:listContent){  
       fields=obj.getClass().getDeclaredFields();  
       int j=0;  
       for(Field v:fields){  
           v.setAccessible(true);  
           Object va=v.get(obj);  
           if(va==null){  
               va="";  
           }  
           if (va instanceof Date)  
           {  
               Date date = (Date) va;  
               SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  
               va = sdf.format(date); 
           }
           sheet.addCell(new Label(j, i,va.toString(),wcf_left));  
           j++;  
       }  
       i++;  
   }  
   /** **********将以上缓存中的内容写到EXCEL文件中******** */  
   workbook.write();  
   /** *********关闭文件************* */  
   workbook.close();     
  
  } catch (Exception e) {  
   result="系统提示：Excel文件导出失败，原因："+ e.toString();  
   System.out.println(result);   
   e.printStackTrace();  
  }  
  return result;  
 }  
}  

下面写一个简单的servlet类来测试导出的情况：

package demo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * 导出excel测试
 * @author sy
 *
 */
public class HelloServlet extends HttpServlet{
    
        public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{
            String result=excelPage(response);
            System.out.println(result);
            /*设置消息返回格式*/  
            response.setCharacterEncoding("utf-8");  
            response.setHeader("Pragma","No-cache");     
            response.setHeader("Cache-Control","no-cache");     
            response.setDateHeader("Expires",0);  
            PrintWriter out = response.getWriter();  
            out.print(result);   
            out.flush();  
            out.close();  
    }
    
    /** 
     * 导出excel 
     * @return 
     */  
    public static String excelPage(HttpServletResponse response){  
        ExportExcel excel=new ExportExcel();  
        List<Object> li=new ArrayList<Object>(); 
        UserInfo user=new UserInfo();
        user.setId(0);
        user.setName("张三");
        user.setPassword("123456");
        user.setBirthday(new Date());
        li.add(user);
        String[] Title={"姓名","年龄","爱好","描述"};  
        return excel.exportExcel(response,"自定义表单信息.xls",Title, li);   
    } 
}

ps:因为我写的导出工具是用于web的，传递参数中含有response，向本地测试的朋友可以自行修改下。