解决File.Delete()删除不掉文件

// 输出文件流
                ou = resp.getOutputStream();
                in = report.getInputStream();
                int bytes = 0;
                byte[] bufferOut = new byte[1024];
                while ((bytes = in.read(bufferOut)) != -1) {
                    ou.write(bufferOut, 0, bytes);
                }
                in.close();
                ou.flush();
                ou.close();//关掉输出流，否则文件无法删除
 
/**
     * 删除报表包含的临时文件
     */
    public void delete() {
        if (files != null) {
            Iterator<File> iter = files.iterator();
            while (iter.hasNext()) {
                File temp = iter.next();
                if(temp.exists()){
                    temp.delete();
                    logger.debug("文件：" + temp.getAbsolutePath() + " 删除成功！");
                }else{
                    logger.debug("文件：" + temp.getAbsolutePath() + "不存在！");
                }
            }
            files = null;
        }
        if (file != null) {
            if(file.exists()){
                file.delete();
                logger.debug("文件：" + file.getAbsolutePath() + " 删除成功！");
                file = null;
            }else{
                logger.debug("文件：" + file.getAbsolutePath() + " 不存在！");
            }
            file = null;
        }
    }