java 导出csv文件到本地 可弹出选择地址框

jsp

<input type="button" class="wd1 btn" value="导出csv" onclick="download();" />

function download(){
		window.location.href = '/esf/ModelAction_download.jspx' ;     //要么使用a标签，不能使用ajax，否则不会弹出选择框
	}
	

Action

//导出csv文件 TODO
	public void download(){
		String savePath = getWebRootDir()+"upload/esf/csvfile/";
		SimpleDateFormat tempDate = new SimpleDateFormat("yyyyMMddHHmmss");  
        String datetime = tempDate.format(new java.util.Date());
        String filePath = savePath + "/" + datetime + "_模型.csv";
		List<String> dataList=new ArrayList<String>();
		List<Object> list = _assistAdpater.selectAllByMapParam("T_ESF_MODEL_selectXiaoQuNeed", null);  //需要在csv文件显示的数据
		for(int i=0 ;i<list.size(); i++){
			EsfModel e = (EsfModel) list.get(i);
			dataList.add(e.getModelid()+","+e.getModelname()+","+e.getGrade()+","+e.getEvaluatetime());   //字符串拼接，csv文件使用,来区分
		}
        boolean isSuccess=CSVUtils.exportCsv(new File(filePath), dataList);
        if(isSuccess){
        	downloadCsv(filePath);
        }
	}
	
	public void downloadCsv(String filePath){
		HttpServletResponse response= ServletActionContext.getResponse();
		//设置下载弹出框
		String csvEncoding = "UTF-8";
		response.setCharacterEncoding(csvEncoding);
		response.setContentType("text/csv;charset=" + csvEncoding);
		response.setHeader("Content-Disposition", "attachment;fileName=model.csv");
		try {
			InputStream inputStream = new FileInputStream(new File(filePath));
			OutputStream os = response.getOutputStream();
			byte[] b = new byte[2048];
			int length;
			while ((length = inputStream.read(b)) > 0) {
				os.write(b, 0, length);
			}
			// 这里主要关闭。
			os.close();
			inputStream.close();
		} catch (Exception e) {
		} 
	}

CSVUtils.java

/**
     * 导出
     * 
     * @param file csv文件(路径+文件名)，csv文件不存在会自动创建
     * @param dataList 数据
     * @return
     */
    public static boolean exportCsv(File file, List<String> dataList){
        boolean isSucess=false;
        
        FileOutputStream out=null;
        OutputStreamWriter osw=null;
        BufferedWriter bw=null;
        try {
            out = new FileOutputStream(file);
            osw = new OutputStreamWriter(out);
            bw =new BufferedWriter(osw);
            if(dataList!=null && !dataList.isEmpty()){
            	bw.append("MODELID,MODELNAME,GRADE,EVALUATETIME").append("\r");    //csv文件第一行
                for(String data : dataList){
                    bw.append(data).append("\r");
                }
            }
            isSucess=true;
        } catch (Exception e) {
            isSucess=false;
        }finally{
            if(bw!=null){
                try {
                    bw.close();
                    bw=null;
                } catch (IOException e) {
                    e.printStackTrace();
                } 
            }
            if(osw!=null){
                try {
                    osw.close();
                    osw=null;
                } catch (IOException e) {
                    e.printStackTrace();
                } 
            }
            if(out!=null){
                try {
                    out.close();
                    out=null;
                } catch (IOException e) {
                    e.printStackTrace();
                } 
            }
        }
        
        return isSucess;
    }