java获取excel模板生成excel并提示用户下载或在线打开

我采用的用jxl来处理excel的处理
首先准备工作，需要的jar包(附近里)
现在开始着手代码
编写你的excle模板
主要方法如下

我这儿是生成采购单报表 obj 为采购单， objList为采购单详细，out为输出流。这儿就是保存到客户端的关键
public static int ExcTempPort(Object obj,List<Object> objlist,OutputStream out)
{
int result=1;//生成excel是否成功标志
String obj_name=obj.getClass().getSimpleName();
String temp_path=null;
try {
temp_path=ReportUtil.class.getResource("/").toURI().getPath()+"/report/temp_buy.xls";
//我模板是放在src--》report文件下的

} catch (URISyntaxException e1) {
// TODO Auto-generated catch block

}
try {
Workbook  workbook=Workbook.getWorkbook(new File(temp_path));
// File file=new File("D:/"+obj_name+".xls");
//这儿是设置生成excel保存的方式。如果取消注释。那就是保存到硬盘上的，用out就是输出流
WritableWorkbook wwb = Workbook.createWorkbook(out, workbook);
    WritableSheet wws = wwb.getSheet("Sheet1");
    //格式化Excel中日前格式
    DateFormat df = new DateFormat("yyyy-MM-dd");
        WritableCellFormat wcfDF = new WritableCellFormat(df);
        //设置单元格样式
        WritableFont font2=new WritableFont(WritableFont.createFont("宋体"),18,WritableFont.BOLD);
    WritableFont font = new WritableFont(WritableFont.createFont("宋体"),12);
    WritableFont font3=new WritableFont(WritableFont.createFont("宋体"),16,WritableFont.BOLD);
    WritableCellFormat cellFormat1 = new WritableCellFormat(font);
    WritableCellFormat cellFormat2=new WritableCellFormat(font2);
    WritableCellFormat cellFormat3=new WritableCellFormat(font3);
    WritableCellFormat cellFormat4=new WritableCellFormat(font);
    cellFormat1.setAlignment(jxl.format.Alignment.CENTRE);// 设置文本对其方式，左对齐还是右对齐
    cellFormat2.setAlignment(jxl.format.Alignment.CENTRE);// 设置文本对其方式，左对齐还是右对齐
    cellFormat2.setBorder(Border.ALL, jxl.format.BorderLineStyle.THIN); // Border是jxl.format.Border
    cellFormat2.setBackground(Colour.BLUE);
    cellFormat3.setBackground(Colour.RED);
    cellFormat4.setBackground(Colour.GRAY_25);
    cellFormat4.setAlignment(jxl.format.Alignment.CENTRE);
   //生成采购单excel报表
 
    Buy buy=(Buy)obj;
    //供应商
    Label la=(Label) wws.getCell(0,0);//获取第一行第一列

    la.setCellFormat(cellFormat2);//设置样式
    wws.mergeCells(2, 1, 4, 1);//这是合并行列。意思就是把第二行的第三到第二行的的第五列合并。这儿的行和列下标从0开始
    Label a1=new Label(2,1,buy.getFactory()==null?"无":buy.getFactory().getFactory03());//这儿是 把第二行的第三列天填入数据
    wws.addCell(a1);//把列添加到Sheet1中

    //单据编号
    wws.mergeCells(6, 1, 8, 1);
    Label a2=new Label(6,1,(buy.getBuy02()==null||buy.getBuy02()=="")?"无":buy.getBuy02());
    wws.addCell(a2);
    int cell=objlist.size()+3;
   
        //采购单详细
    for(int i=3;i<objlist.size()+3;i++)
    {
    BuyMx buymx=(BuyMx) objlist.get(i-3);
    Number b1=new Number(0,i,buymx.getBuyMx01()<1?0:buymx.getBuyMx01());
    wws.addCell(b1);
   
    Label b2=new Label(1,i,buymx.getGoods()==null?"无":buymx.getGoods().getGoods03());
    wws.addCell(b2);
   
    Label b3=new Label(2,i,buymx.getGoods()==null?"无":buymx.getGoods().getGoods07());
    wws.addCell(b3);
   
    Number b4=new Number(3,i,buymx.getBuyMx02()<1?0:buymx.getBuyMx02());
    wws.addCell(b4);
   
    Number b5=new Number(4,i,buymx.getBuyMx03()<1?0:buymx.getBuyMx03());
    wws.addCell(b5);
   
    Label b6=new Label(5,i,buymx.getGoods()==null?"无":buymx.getGoods().getGoods10());
    wws.addCell(b6);
   
    DateTime b7=new DateTime(6,i,buy.getBuy08()==null?new Date():buy.getBuy08(),wcfDF);
    wws.addCell(b7);    
    Label b8=new Label(7,i,(buy.getBuy09()==null||buy.getBuy09()=="")?"无":buy.getBuy09());
    wws.addCell(b8);
   
    Label b9=new Label(8,i,(buy.getBuy10()==null||buy.getBuy10()=="")?"无":buy.getBuy10());
    wws.addCell(b9);
   
    }
   
    Label  c=new Label(1,cell,"备注：");
    wws.addCell(c);
    wws.mergeCells(2, cell, 8, cell);
    Label c0=new Label(2,cell,(buy.getBuy10()==null||buy.getBuy10()=="")?"无":buy.getBuy10());
    wws.addCell(c0);
    Label c1_1=new Label(0,cell+1,"下单日期：");
    wws.addCell(c1_1);
    wws.mergeCells(1, cell+1, 2, cell+1);
    DateTime c1=new DateTime(1,cell+1,buy.getBuy07()==null?new Date():buy.getBuy07(),wcfDF);
    wws.addCell(c1);
    Label c2_2=new Label(3,cell+1,"交货日期：");
    System.out.println(buy.getBuy08());
    wws.addCell(c2_2);
    wws.mergeCells(4, cell+1, 5, cell+1);
    DateTime c2=new DateTime(4,cell+1,buy.getBuy08()==null?new Date():buy.getBuy08(),wcfDF);
    wws.addCell(c2);
    Label c3_3=new Label(6,cell+1,"经手人：");
    wws.addCell(c3_3);
    wws.mergeCells(7, cell+1, 8, cell+1);
    Label c3=new Label(7,cell+1,(buy.getBuy09()==null||buy.getBuy09()=="")?"无":buy.getBuy09());
    wws.addCell(c3);
    }
  
    wwb.write();
    wwb.close();
    workbook.close();
    out.close();
} catch (BiffException e) {
// TODO Auto-generated catch block
System.out.println(e.toString());
result=1;
} catch (IOException e) {
// TODO Auto-generated catch block
System.out.println(e.toString());
result=1;
} catch (WriteException e) {
// TODO Auto-generated catch block
System.out.println(e.toString());
result=1;
}

return result;
}
上面是工具类下面的是action代码
String filenames = String.valueOf(System.currentTimeMillis()) + "_"
+ stockin.getClass().getSimpleName() + ".xls";//设置excel的名称
response.setContentType("application/vnd.ms-excel;charset=GBK");
response.addHeader("Content-Disposition","attachment;   filename=\""+ new String(filenames.getBytes(), "iso8859-1")+ "\"");//这儿处理中文名。以及返回类型的申明
OutputStream os = response.getOutputStream();//输出到客户端
ReportUtil.ExcTempPort(stockin, stockInMxlist, os);//调用工具类