request.getScheme()的使用方法

今天在修改bug时，发现程序使用了 request.getScheme() 。不明白是什么意思，在google 搜索了一下。现在明白了。整理如下：

1、request.getScheme() 返回当前链接使用的协议；比如，一般应用返回http;SSL返回https;

2、在程序中的应用如下：

<%

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://"

            + request.getServerName() + ":" + request.getServerPort()

            + path + "/";

%>

3、复习一下request 的常用方法：

request.getSchema()可以返回当前页面使用的协议，http 或是 https;

request.getServerName()可以返回当前页面所在的服务器的名字;

request.getServerPort()可以返回当前页面所在的服务器使用的端口,就是80;

request.getContextPath()可以返回当前页面所在的应用的名字;

例如:

<%

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://"

            + request.getServerName() + ":" + request.getServerPort()

            + path + "/";

%>

<!DOCTYPE html>

<html>

<head>

<base href="<%=basePath%>">

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grHREJ30gMtg2KU6Xi0JtPsAjxFG/HVhd9wv/NYSZ2/G/LssRd0qwrQ5q05enM3XNG4hKJ2kzmmiOr9LnEps6n7aSq5k1PmWRalV6bx3NRvEURfIROOfEnFka6hHJu1JWYkqePpfz97aO8rpTPkXbT2YcCfiPh4yg5E6mWc5bSDj73K+Uvj8e5FdDHCAEdOnwjoSACxY2h1epFsPfO8JVrfQnbbqqZkFouGMHnG8M2G4HixtBqdYH/Hx65egzqRUrrpsWbGLbZCBQ3hlYD4FQTwzYbgeLGzWrS+wHYsDVka3wbiBURKG4MrQbAqSaGbTYCxY2h1QA41cSwzUaguA3vBmDDhq2GLVZEoLgNf2DYsGGrYYsVMSsu8BLpSBcRBnajiBjhRF4YVH8jEQUiEUciNNiHHDV/p+Ggi3RB2k+RYoC4DFxI5fex2+khGkYQwmLUNfyIe/kvRRyJKBBeHImIoFt1KiD6SAIplzpUsxxThEg5H5bxP+pafp8IDKeHaBgh5fqysD4lUYU3UceROA71Wpn9yNXVTdPU+UQ+u04JclyY4/1vWa8IGFXmY1vOp6DOB7PNKEl1r6h1zPBkHrr4SW9t4Vl0SAtPqNenqxlpWafj4K90Yuyb6nfFlMBrhabq2t0LHgGjXvmEHQGjsdS9oiozrGGhWaKTeujuEbpawrP4XFlSOq/MsbXk2L/iAiR8YRJdRAjvWpt81WL/6BNKdHEkSLXcJo8IodvFV3NSLnPijzIwhVRItsg7izQmrgvPF2LhQcikpVmUVxFvpIZgF/KC7268q5X4RELwieSgi4QQNB//G5HXEOWnC6uG+Efk8JazNqRFdMRdYr3iQsOrnLiITjV1mDRV7jgZBiLQQ3eON50HlDoqn8M7cq/REig8C1vJhh1spQ4rg6hlstJ5ZZKrEl9NU1xs3S8ihN6n84k+ocM/jkQNPh3PkCpyw47xLgMlypBPYAoxjiKrfFy5RIeUnSWFW2TZKhPZWewuaqusPkqni+QQNDKGLhJCoHykdYq8YytKn84Uriuuf2WoInL4RGwIBHs0YoWRnjWrFVJFra0OH1nlamgUgQny0ElYVNUbVV3riynDd1RfCW1K8OhCCbI9LqFUef4fsBaoJLRQsYkAAAAASUVORK5CYII=" 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