jxl导出Excel

首先先在自己工程中导入jxl的jar包；
疯狂google后找到一段别人的导出excel方法，先备份于下面：
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Vector;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Colour;
import jxl.format.UnderlineStyle;
import jxl.format.VerticalAlignment;
import jxl.write.Label;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;
public class ExportData {
    /** *//**
     * 导出数据为XLS格式
     * @param fileName        文件的名称，可以设为绝对路径，也可以设为相对路径
     * @param content        数据的内容
     */
    public static void exportExcel(String fileName, Vector<Person> content) {
        WritableWorkbook wwb;
        FileOutputStream fos;
        try {    
            fos = new FileOutputStream(fileName);
            wwb = Workbook.createWorkbook(fos);
            WritableSheet ws = wwb.createSheet("三国志武将列表", 10);        // 创建一个工作表
            //    设置单元格的文字格式
            WritableFont wf = new WritableFont(WritableFont.ARIAL,12,WritableFont.NO_BOLD,false,
                    UnderlineStyle.NO_UNDERLINE,Colour.BLUE);
            WritableCellFormat wcf = new WritableCellFormat(wf);
            wcf.setVerticalAlignment(VerticalAlignment.CENTRE); 
            wcf.setAlignment(Alignment.CENTRE); 
            ws.setRowView(1, 500);
            //    填充数据的内容
            Person[] p = new Person[content.size()];
            for (int i = 0; i < content.size(); i++){
                p[i] = (Person)content.get(i);
                ws.addCell(new Label(1, i + 1, p[i].getName(), wcf));
                ws.addCell(new Label(2, i + 1, p[i].getNickname(), wcf));
                ws.addCell(new Label(3, i + 1, p[i].getPower(), wcf));
                ws.addCell(new Label(4, i + 1, p[i].getWit(), wcf));
                ws.addCell(new Label(5, i + 1, p[i].getPolity(), wcf));
                ws.addCell(new Label(6, i + 1, p[i].getCharm(), wcf));
                ws.addCell(new Label(7, i + 1, p[i].getStory(), wcf));
                if(i == 0)
                    wcf = new WritableCellFormat();
            }
            wwb.write();
            wwb.close();
        } catch (IOException e){
        } catch (RowsExceededException e){
        } catch (WriteException e){}
    }
    /** *//**
     * 从Excel文件里读取数据保存到Vector里
     * @param fileName        Excel文件的名称
     * @return                Vector对象,里面包含从Excel文件里获取到的数据
     */
    public static Vector<Person> importExcel(String fileName){
        Vector<Person> v = new Vector<Person>();
        try {
            Workbook book = Workbook.getWorkbook(new File(fileName));
            Sheet sheet = book.getSheet(0);        // 获得第一个工作表对象 
            int rows = sheet.getRows();
            
            for(int i = 0; i < rows; i++) {
                Cell [] cell = sheet.getRow(i);
                if(cell.length == 0)
                    continue;
                
                Person p = new Person();
                p.setName(sheet.getCell(1, i).getContents());
                p.setNickname(sheet.getCell(2, i).getContents());
                p.setPower(sheet.getCell(3, i).getContents());
                p.setWit(sheet.getCell(4, i).getContents());
                p.setPolity(sheet.getCell(5, i).getContents());
                p.setCharm(sheet.getCell(6, i).getContents());
                p.setStory(sheet.getCell(7, i).getContents());
                v.add(p);
            }
            book.close();
        }catch(Exception e) {} 
        return v;
    }
    public static void main(String [] args){
        String fileName = "C:\\test.xls";
        String fileNameNew = "C:\\testNew.xls";
        
        Person p0 = new Person("姓名","字","武力","智力","政治","魅力","英雄事迹");
        Person p1 = new Person("赵云","子龙","98","84","83","87","单骑救主!!!");
        Person p2 = new Person("马超","孟起","98","62","40","88","杀得曹操割须弃袍!!!");
        Person p3 = new Person("诸葛亮","孔明","55","100","92","93","死后木偶退兵，锦囊杀魏延!!!");
        Vector<Person> v = new Vector<Person>();
        v.add(p0);
        v.add(p1);
        v.add(p2);
        v.add(p3);
        
        exportExcel(fileName, v);
        System.out.println("成功导出数据到Excel文件(" + fileName + ")了!!!");
        
//        Vector<Person> vector = importExcel(fileName);
//        System.out.println("成功从Excel文件(" + fileName + ")导入数据!!!");
//        
//        exportExcel(fileNameNew, vector);
//        System.out.println("成功将" + fileName + "里的数据手复制到" + fileNameNew + "中!!!");
    }
}
上面的方法很好，导出我试过了，很好用，但它只实现了自动生成了excel文件；但是我们项目要求的是：弹出保存/打开excel的对话框，然后直接打开或输入路径再保存；
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Vector;
import javax.servlet.http.HttpServletResponse;
import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Colour;
import jxl.format.UnderlineStyle;
import jxl.format.VerticalAlignment;
import jxl.write.Label;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;
public class ExportExcel {
public static void exportExcel( Object objIn,Object objOut) {
         try {
         //取得response HttpServletResponse
         HashMap hmOut = (HashMap)objOut;
         HashMap hmIn = (HashMap)objIn;
         HttpServletResponse response=(HttpServletResponse)hmIn.get("response");
         //设置table列名
         String excelName =(String)hmIn.get("excelName");
         String[] excelNameArray = excelName.split(",");
         
         
         //取得key
         String[] excelKeyArray = (String[])hmOut.get("excelKey");
         
         OutputStream os = response.getOutputStream();// 取得输出流   
             response.reset();// 清空输出流  
             response.setHeader("Content-disposition", "attachment; filename="+new String("Book1".getBytes("GB2312"),"8859_1")+".xls");// 设定输出文件头   
             response.setContentType("application/msexcel");// 定义输出类型 
             
             WritableWorkbook wwb = Workbook.createWorkbook(os); // 建立excel文件   
         
             WritableSheet ws = wwb.createSheet("Sheet1", 10);        // 创建一个工作表
             //    设置单元格的文字格式
             WritableFont wf = new WritableFont(WritableFont.ARIAL,10,WritableFont.NO_BOLD,false,
                     UnderlineStyle.NO_UNDERLINE,Colour.BLUE);
             WritableCellFormat wcf = new WritableCellFormat(wf);
             wcf.setVerticalAlignment(VerticalAlignment.CENTRE); 
             wcf.setAlignment(Alignment.CENTRE); 
             ws.setRowView(0, 500);
             //    填充数据的内容
             int len=((String[])hmOut.get(excelKeyArray[0])).length;
             //设置列头名
         for (int j=0;j<excelKeyArray.length;j++){
            ws.addCell(new Label(j, 0, excelNameArray[j], wcf));
         }
         //设置内容
         wcf = new WritableCellFormat();
             for (int i = 0; i <len; i++){
             for (int j=0;j<excelKeyArray.length;j++){
                ws.addCell(new Label(j, i+1, ((String[])hmOut.get(excelKeyArray[j]))[i], wcf));
             }
             }
             wwb.write();
             wwb.close();
         } catch (IOException e){
         } catch (RowsExceededException e){
         } catch (WriteException e){}
     }
}
注：现在弹出对话框，就是说要用io流的方式，io流就要从response中取；这里要导入tomcat里的一个jar：servlet.jar