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2.把包放到WEB-INF的lib目錄下在開發(fā)環(huán)境中引入這個(gè)包

3.開始寫代碼了，這里以一個(gè)Struts1.2的ActionMethod為例，其實(shí)只要能取了request和response對象，操作都是一樣的的。

 1    /** *//**
 2     * 生成信息的XLS
 3     * alex 2007-7-3 下午05:01:56
 4     */
 5    public ActionForward makeRichVoteRZ(ActionMapping mapping, ActionForm form,
 6            HttpServletRequest request, HttpServletResponse response)
 7            throws Exception {
 8        
 9        //讀出數(shù)據(jù)
10        String richvote_id = Common.getValue("richvote_id", request);
11        String sql = "select user_name,user_sex,user_address,card_id,postalcode,mobile,tel_day,email from tbl_member where member_id in (select user_id from tbl_vote_detail where vote_id in(select vote_id from tbl_vote where vote_board = '"+richvote_id+"'))";
12        RowSet rs = table.select(sql);
13        
14        //生成xls
15        try{
16            
17            response.setContentType("application/vnd.ms-excel");
18            response.addHeader("Content-Disposition","attachment;   filename=\""   +  Common.getFileName()+".xls"  +   "\"");    
19            OutputStream os = response.getOutputStream();
20            WritableWorkbook wwb = Workbook.createWorkbook(os);
21            
22            
23            int ncout = rs.length();
24            int maxnum = 50000; //一次最多寫入量
25            int times = (ncout+maxnum-1)/maxnum;
26            
27            //大循環(huán)
28            for(int t=0; t<times; t++){
29                
30                //新建一張表
31                WritableSheet wsheet = wwb.createSheet("members_"+(t+1),t);
32                //設(shè)置表頭
33                Label label = new Label(0,0,"");
34                wsheet.addCell(label);
35                label = new Label(0,0,"會員姓名");
36                wsheet.addCell(label);
37                label = new Label(1,0,"卡號");
38                wsheet.addCell(label);
39                label = new Label(2,0,"聯(lián)系地址");
40                wsheet.addCell(label);
41                label = new Label(3,0,"郵編");
42                wsheet.addCell(label);
43                label = new Label(4,0,"聯(lián)系電話");
44                wsheet.addCell(label);
45                label = new Label(5,0,"手機(jī)");
46                wsheet.addCell(label);
47                label = new Label(6,0,"Email");
48                wsheet.addCell(label);
49                label = new Label(7,0,"性別");
50                wsheet.addCell(label);
51                
52                
53                //讀出數(shù)據(jù)
54                int base = (t*maxnum);
55                for(int i = 0; i < rs.length(); i++){
56                    Row rw = rs.get(i+base);
57                    //System.out.println((i+1));
58                    label = new Label(0,(i+1),(String)rw.get("user_name")    );
59                    wsheet.addCell(label);
60                    label = new Label(1,(i+1),(String)rw.get("card_id"));
61                    wsheet.addCell(label);
62                    label = new Label(2,(i+1),(String)rw.get("user_address"));
63                    wsheet.addCell(label);
64                    label = new Label(3,(i+1),(String)rw.get("postalcode"));
65                    wsheet.addCell(label);
66                    label = new Label(4,(i+1),(String)rw.get("tel_day"));
67                    wsheet.addCell(label);
68                    label = new Label(5,(i+1),(String)rw.get("mobile"));
69                    wsheet.addCell(label);
70                    label = new Label(6,(i+1),(String)rw.get("email"));
71                    wsheet.addCell(label);
72                    label = new Label(7,(i+1),(String)rw.get("user_sex"));
73                    wsheet.addCell(label);
74                }    
75                
76            }//結(jié)束大循環(huán)
77            
78            wwb.write();
79            wwb.close();
80            os.close();
81            response.flushBuffer();
82            
83        }catch(Exception e){
84            System.out.println("生成信息表(Excel格式)時(shí)出錯(cuò)：");
85            e.printStackTrace();
86        }
87        
88        return null;
89    }

代碼簡單說明：
1.設(shè)定好response的相關(guān)屬性：
response.setContentType("application/vnd.ms-excel");
response.addHeader("Content-Disposition","attachment;   filename=\""   +  Common.getFileName()+".xls"  +   "\""); 
2.取到response的OutputStream實(shí)例，并用這個(gè)實(shí)例化一個(gè)WritableWorkbook對象
OutputStream os = response.getOutputStream();
WritableWorkbook wwb = Workbook.createWorkbook(os);
3.新建一個(gè)表
WritableSheet wsheet = wwb.createSheet("members_"+(t+1),t);
4.往表里加行頭
Label label = new Label(0,0,"");
    wsheet.addCell(label);
    label = new Label(0,0,"會員姓名");
    wsheet.addCell(label);
    label = new Label(1,0,"卡號");
    wsheet.addCell(label);
    label = new Label(2,0,"聯(lián)系地址");
    wsheet.addCell(label);
    label = new Label(3,0,"郵編");
    wsheet.addCell(label);
    label = new Label(4,0,"聯(lián)系電話");
    wsheet.addCell(label);
    label = new Label(5,0,"手機(jī)");
    wsheet.addCell(label);
    label = new Label(6,0,"Email");
    wsheet.addCell(label);
    label = new Label(7,0,"性別");
    wsheet.addCell(label);
5.往表里加數(shù)據(jù)行
for(int i = 0; i < rs.length(); i++){
     Row rw = rs.get(i+base);
     //System.out.println((i+1));
     label = new Label(0,(i+1),(String)rw.get("user_name") );
     wsheet.addCell(label);
     label = new Label(1,(i+1),(String)rw.get("card_id"));
     wsheet.addCell(label);
     label = new Label(2,(i+1),(String)rw.get("user_address"));
     wsheet.addCell(label);
     label = new Label(3,(i+1),(String)rw.get("postalcode"));
     wsheet.addCell(label);
     label = new Label(4,(i+1),(String)rw.get("tel_day"));
     wsheet.addCell(label);
     label = new Label(5,(i+1),(String)rw.get("mobile"));
     wsheet.addCell(label);
     label = new Label(6,(i+1),(String)rw.get("email"));
     wsheet.addCell(label);
     label = new Label(7,(i+1),(String)rw.get("user_sex"));
     wsheet.addCell(label);
    } 
6.把生成的excel數(shù)據(jù)輸出到response的OutputStream
wwb.write();
   wwb.close();
   os.close();
   response.flushBuffer();
7.完成

有什么疑問可以留言，我會盡量幫助。