java 下载

    private static final String SQL_QUERY_MAP="select resname,contenttype,downtimes from courseresource where resid=?";
    public Map getResourceInfo(int resid) ...{
        Map i=jt.queryForMap(SQL_QUERY_MAP,new Object[]...{Integer.valueOf(resid)});
        return i;
    }
    private static final String SQL_DOWNTIMES_UP="update courseresource set downtimes=? where resid=?";
    public void addDownTimes(long downTimes, int resid) ...{
        long downtime=downTimes+1;
        jt.update(SQL_DOWNTIMES_UP,new Object[]...{downtime,resid});
    }





private InputStream inputStream;
    private String resFileContentType;
    
    
    public InputStream getInputStream() ...{
        return inputStream;
    }

    public void setInputStream(InputStream inputStream) ...{
        this.inputStream = inputStream;
    }

    public String getResFileContentType() ...{
        return resFileContentType;
    }

    public void setResFileContentType(String resFileContentType) ...{
        this.resFileContentType = resFileContentType;
    }

    public String download() throws Exception ...{
        long downTimes;
        try ...{
            Map res = getServMgr().getCourseResourceService().getResourceInfo(resid);
            inputStream = new FileInputStream(ServletActionContext
                    .getServletContext().getRealPath(
                            "/WEB-INF/files/courseResource/" + resid + "."+(String) res.get("CONTENTTYPE")));
            resFileFileName = URLEncoder.encode((String) res.get("RESNAME"),
                    "UTF-8");
            log.debug("--------------------resFileFileName-----------------------"+resFileFileName);
            resFileContentType = (String) res.get("CONTENTTYPE");
            downTimes = Integer.parseInt(String.valueOf(res.get("DOWNTIMES")));
        } catch (FileNotFoundException e) ...{
            setResult(ERROR);
            addMessage("下载的文件不存在！");
            addRedirURL("关闭窗口", "javascript:window.close()");
            return EXECUTE_RESULT;
        }

        getServMgr().getCourseResourceService().addDownTimes(downTimes, resid);
        return SUCCESS;
    }