Servlet(二)--ResponseHeader

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Servlet提供下载

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setHeader("Content-Disposition","attachment;filename=1.gif");InputStream in=this.getClass().getClassLoader().getResourceAsStream(文件);byte []buffer=new byte[1024];int len=0;OutputStream out=response.getOutputStream();while((len=in.read(buffer))>0){out.write(buffer, 0, len);}}

Servlet输出图片

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("image/jpeg");InputStream in=this.getClass().getClassLoader().getResourceAsStream(图片);byte []buffer=new byte[1024];int len;OutputStream out=response.getOutputStream();while((len=in.read(buffer))!=-1){out.write(buffer, 0, len);}}

页面定时刷新

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setHeader("refresh", "2");//设置刷新间隔为2秒Date date=new Date();SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String today=df.format(date);PrintWriter out=response.getWriter();out.println(today);}

Servlet输出excel表格

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("application/vnd.ms-excel");PrintWriter out=response.getWriter();out.println("\tQ1\tQ2\tQ3\tQ4\tTotal");out.println("Apples\t78\t87\t92\t29\t=SUM(B2:E2)");out.println("Oranges\t77\t86\t93\t30\t=SUM(B3:E3)");}

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