servlet实现简单下载（copy）

金丞舞

于 2010-05-21 11:04:25 发布

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文章标签： Servlet

本文链接：https://blog.youkuaiyun.com/xiaoxiaonu/article/details/83632223

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本文介绍了一个名为CopyDataServlet的Java Web应用组件，该组件继承自HttpServlet，并实现了doGet和doPost方法来处理HTTP请求。主要功能是从指定源文件复制数据到目标位置，使用FileInputStream读取源文件，FileOutputStream写入目标文件，并通过循环逐块拷贝数据。

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public class CopyDataServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		String realRoot = this.getServletConfig().getServletContext().getRealPath(
				"/")+"/data/";
		File theFile = LYFLDAPUtil.readDatFileOfCurDay();
		if(null != theFile){
			String src = theFile.getName();
			SimpleDateFormat sf = new SimpleDateFormat("yyyyMMdd");
			String dateString = sf.format(new Date());
			String dst = realRoot + dateString+".dat";
			System.out.println(theFile.getName());
			InputStream in = new FileInputStream(LYFLDAPUtil.SAMETIME_FILE_PATH + File.separator +src); //source file
			OutputStream out = new FileOutputStream(dst);//destination file

			byte[] buf = new byte[1024];
			int len;
			while ((len = in.read(buf)) > 0) {
			out.write(buf, 0, len);
			}
			in.close();
			out.close();
		}



	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request, response);
	}

}