【说明】

1.点击导出，取前台现有的数据通过ajax传到后台，

2.通过jxl生成服务器上的xls文件

3.ajax成功之后转到download，也就是打开保存界面：

【配置】

1.使用了struts2的注解配置

【代码】

jsp：

		//导出
	    $('#exportBtn').click(function(){
			var str = '';
	    	$('div.datagrid-view2 table.datagrid-btable')
				.find('td')
				.each(function(){
					str += $(this).text() + '%%%%';
				});
	    	
	    	$.ajax({
				url : 'scoreAction!exportExcel.action',
				type : 'POST',
				data : {
					str : str,
					fileName : 'score.xls'
				},
				dataType : 'json'
	    	}).done(function(data){
	    		if(data && data == 'success'){
			    	window.location.href = "scoreAction!downloadFile.action?fileName=score.xls";
	    		}else{
	    			$.messager.show({
						title : '失败',
						msg : '导出失败！'
					});
	    		}
	    	}).fail(function(){
	    		$.messager.show({
					title : '失败',
					msg : '导出失败！'
				});
	    	});
	    });

action：

action中添加字段fileName和它的setter，getter

添加一个方法getInputStream（），

添加注解，部分代码如下：

@Action(
		value = "scoreAction", 
		results = { 
			@Result(name = "download", type="stream",params={
		            "contentType","application/octet-stream",
		            "inputName","inputStream",
		            "contentDisposition","attachment;filename=${fileName}",
		            "bufferSize","4096"            
		    })
		})
public class ScoreAction extends BaseAction implements ModelDriven<ClazzRlLearnerPage> {
	@Autowired
	private ScoreServiceI scoreService;
	private String fileName;
	private String str;
	
	//method--public
	public void exportExcel(){
		writeJson(scoreService.exportExcel(str));
	}
	public String downloadFile(){
		return "download";
	}
	public InputStream getInputStream()
	{
		InputStream is = null;
		String filePath = 
				((ServletContext)ActionContext.getContext().get(ServletActionContext.SERVLET_CONTEXT)).getRealPath("/") + "jsp\\score\\xls\\score.xls";
		
		try {
			is = new FileInputStream(new File(filePath));
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		
		return is;
	}
	
	//getters and setters
	public String getStr() {
		return str;
	}
	public void setStr(String str) {
		this.str = str;
	}
	public String getFileName() {
		return fileName;
	}
	public void setFileName(String fileName) {
		this.fileName = fileName;
	}
}

jxl实现导出excel：

//导出Excel
	public String exportExcel(String str){
		WritableWorkbook wwb;
		String[] strs = str.split("%%%%");
		String path = ((ServletContext)ActionContext.getContext().get(ServletActionContext.SERVLET_CONTEXT)).getRealPath("/");
		
        try {  
        	//创建excel
            wwb = Workbook.createWorkbook(new FileOutputStream(path + "jsp\\score\\xls\\score.xls"));

            //创建格式
            WritableCellFormat wcf = new WritableCellFormat();
            wcf.setVerticalAlignment(VerticalAlignment.CENTRE);
            wcf.setAlignment(Alignment.CENTRE);
            
            //创建sheet
            WritableSheet ws = wwb.createSheet("sheet", 0);
            ws.setRowView(1, 500);
            
            //表头
            ws.addCell(new Label(0, 0, "序号", wcf));
            ws.addCell(new Label(1, 0, "机构", wcf));
            ws.addCell(new Label(2, 0, "班级", wcf));
            ws.addCell(new Label(3, 0, "课件信息", wcf));
            ws.addCell(new Label(4, 0, "学员姓名", wcf));
            ws.addCell(new Label(5, 0, "课件成绩", wcf));
            ws.addCell(new Label(6, 0, "作业成绩", wcf));
            ws.addCell(new Label(7, 0, "总成绩", wcf));
            
            //内容
            int col = 0;
            int row = 1;
            for (int i = 0; i < strs.length; i++) {
            	if(i == 0) ws.addCell(new Label(col++, row, row+"", wcf));
            	ws.addCell(new Label(col++, row, strs[i], wcf));
            	if((i+1)%7 == 0){
            		col = 0;
            		row++;
            		if((i+1) != strs.length) ws.addCell(new Label(col++, row, row+"", wcf));
            	} 
			}

            wwb.write();
            wwb.close();
            
            return "success";
        } catch (Exception e){
        	e.printStackTrace();
        	
        	return "fail";
        }
}