码迷,mamicode.com
首页 > 编程语言 > 详细

java EE : http 协议响应头部信息验证

时间:2018-10-17 14:50:13      阅读:184      评论:0      收藏:0      [点我收藏+]

标签:div   put   必须   back   doget   evel   过期   span   dev   

一  location :*****   302   重定向 

private void doWork(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 设置响应 code resp.setStatus(
302);
// 设置响应 header 参数 ,通知浏览器进行重定向 resp.setHeader(
"location", "index.jsp"); }

二   refresh :3;url=index.jsp  浏览器自动刷新

 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 设置响应 header 参数,通知浏览器 3 秒后进行自动刷新,重定向至 url 指定地址 resp.setHeader(
"refresh","3;url=index.jsp"); }

三  content-type: image/png   告知浏览器调用哪个模块打开,比如:显示图片、显示 html 信息

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 设置 header 参数 ,告知浏览器调用何种模块打开 resp.setHeader(
"content-type", "image/png");
// 使用 IO 流返回图片字节信息 InputStream inputStream
= new FileInputStream("E:\\trunck\\chapter02\\servletTest2\\web\\test.png"); int len = -1; byte[] bytes = new byte[1024]; while ((len = inputStream.read(bytes)) != -1) { resp.getOutputStream().write(bytes, 0, len); } inputStream.close(); }

四   Content-Disposition :attachment;filename=文件名   通知浏览器下载该文件

   @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        File file=new File("E:\\trunck\\chapter02\\servletTest2\\web\\test.png");
// 设置 header 参数,通知浏览器下载该文件 resp.setHeader(
"Content-Disposition","attachment;filename="+file.getName()); InputStream inputStream=new FileInputStream(file); int len = -1 ; byte[] bytes=new byte[1024]; while ((len=inputStream.read(bytes))!=-1){ resp.getOutputStream().write(bytes,0,len); } inputStream.close(); }

五   content-encoding : gzip(服务器端响应过来的压缩模式)    content-length :字节长度

  Accept-Encoding: gzip, deflate (客户端通知服务端,浏览器所支持的压缩模式)

https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Headers/Content-Encoding

  @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        String content = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
        System.out.println("字符串长度:" + content.length());
        System.out.println("字符串转数组长度:" + content.getBytes().length);
// IO 流中 ByteArrayOutputStream ByteArrayOutputStream byteArrayOutputStream
= new ByteArrayOutputStream(); GZIPOutputStream gzipOutputStream = new GZIPOutputStream(byteArrayOutputStream); gzipOutputStream.write(content.getBytes()); gzipOutputStream.close(); byte[] bytes = byteArrayOutputStream.toByteArray(); System.out.println("压缩后数组长度:" + bytes.length); resp.setHeader("content-encoding", "gzip"); resp.setHeader("content-length", bytes.length + ""); resp.getOutputStream().write(bytes); }

六   expires :-1(HTTP1.1的客户端和缓存必须将其他非法的日期格式(包括0)看作已经过期)    cache-control:no-cache pragma:no-cache  告知浏览器不进行缓存

  @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setHeader("expires", "-1");
        resp.setHeader("cache-control", "no-cache");
        resp.setHeader("pragma", "no-cache");

        resp.getWriter().write("abccc");
    }

 

java EE : http 协议响应头部信息验证

标签:div   put   必须   back   doget   evel   过期   span   dev   

原文地址:https://www.cnblogs.com/Lumia1020/p/9803244.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!