String requestUrl = request.getScheme() // 当前链接使用的协议
+ “://” + request.getServerName()// 服务器地址
+ “:” + request.getServerPort() // 端口号
+ request.getContextPath() // 应用名称,如果应用名称为
+ request.getServletPath() // 请求的相对url
+ “?” + request.getQueryString(); // 请求参数
举例:request.getScheme() = “http”;
request.getServerName() = “127.0.0.1”;
request.getServerPort() = “8080”;
request.getContextPath() = “world”;
request.getServletPath() = “index.jsp”;
request.getQueryString() = “name=lilei&sex=1”;