JXL生成Excel，并提供下载（1：生成Excel)

public String exportExcel(long id) {
    String preeReviewName = "文件名";
    
    String filePath = 路径名;
    WritableWorkbook wwb =null;
    try {
        wwb = Workbook.createWorkbook(new File(filePath + preeReviewName +".xls"));
        writeReviewGeneral(wwb, id);
        //一个Excel表若有多个sheet页，可以加多个
        wwb.write();
        wwb.close();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    } 
    return preeReviewName;
}

private void writeReviewGeneral(WritableWorkbook wwb,long id){
    //获取数据库的数据
    PreeReviewInfo result = preeReviewInfoDS.getPreeReviewInfo(id).getT();
    //数据库各个字段的值放进List
    List<String> list = new ArrayList<String>();
    list.add(result.getPreeReviewName());//项目名称
    list.add(result.getPreeReviewTarget());//评审对象
    list.add(ReviewTypes.getDescription(result.getPreeReviewType()));//评审方式
    list.add(result.getPreeReviewScale());//评审规模
    list.add(result.getProcessName(););//项目当前阶段:所处过程
    list.add(result.getPreeCompere());//主持人
    list.add(result.getDocumentCreator());//作者
    list.add(result.getPreeRegistrar());//记录员
    list.add(result.getPreeActor());//评审员
    list.add(result.getExpert());//关键资源:专家
    try {
        WritableSheet sheet = wwb.createSheet("评审概况",0);
        //设置头部格式
        WritableCellFormat headerFormat = getExcelHeadStyle();
        //设置内容格式
        WritableCellFormat contentFormat = getExcelContentStyle();
        for(int i =0; i < list.size(); i++){
            sheet.setColumnView(0, 25);//列宽
            sheet.setColumnView(1, 25);//列宽
            
            sheet.setRowView(i, 300);    //行高
            sheet.addCell(new Label(0,i,ExportSummary.reviewGeneral[i],headerFormat));
            sheet.addCell(new Label(1,i,list.get(i),contentFormat));
        }

    } catch (RowsExceededException e) {
        e.printStackTrace();
    } catch (WriteException e) {
        e.printStackTrace();
    } 
}


private WritableCellFormat getExcelHeadStyle(){
    WritableFont font = new WritableFont(WritableFont.createFont("宋体"), 
            11, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.RED);
    WritableCellFormat headerFormat = new WritableCellFormat(NumberFormats.TEXT); 
    headerFormat.setFont(font);
    try {
        //内容水平居中显示
        headerFormat.setAlignment(jxl.format.Alignment.CENTRE);
    } catch (WriteException e) {
        e.printStackTrace();
    } 
    
    return headerFormat;
}

private WritableCellFormat getExcelContentStyle(){
    WritableFont font = new WritableFont(WritableFont.createFont("宋体"), 
            11, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.BLACK);
    WritableCellFormat contentFormat = new WritableCellFormat(NumberFormats.TEXT); 
    contentFormat.setFont(font);
    try {
        //允许换行
        contentFormat.setWrap(true);
    } catch (WriteException e) {
        e.printStackTrace();
    }
    return contentFormat;
}