Servlet 方法

1.设置字符编码,避免中文乱码

protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // 设置字符编码,避免中文乱码
        response.setContentType("text/html;Charset=utf-8");
        PrintWriter out = response.getWriter();
        out.println("你好！！！");//写到浏览器
    }

2.网页重定向：

protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // 网页重定向
        // 设置响应内容类型
        response.setContentType("text/html");
        // 要重定向的新位置
        String site = "http://www.baidu.com";
        response.setStatus(response.SC_MOVED_PERMANENTLY);// SC_MOVED_TEMPORARILY
        response.setHeader("Location", site);
    }

3.转发：转发的文件根目录是此web项目的根目录。

protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
    getServletContext().getRequestDispatcher("/success.html").forward(request, response);
    }

转发与重定向区别：转发浏览器只访问一次服务器：最初的那次请求，重定向访问两次服务器：最初的一次，重定向的那次。

4.延时，自动刷新:

protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // 自动跳转，可以延时，自动刷新
        response.setStatus(HttpServletResponse.SC_TEMPORARY_REDIRECT);
        response.setHeader("refresh", "3;http://www.baidu.com");
    }

5.包含相应web页面：

protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        //把header.html页面的执行结果包含
        req.getRequestDispatcher("/header.html").include(req, resp);
        //不能使用打印字符流
        //PrintWriter out = resp.getWriter();
        //out.println("include servet body.....");
        OutputStream os = resp.getOutputStream();
        os.write("include servet body.....".getBytes());
        req.getRequestDispatcher("/footer.html").include(req, resp);
    }