HttpServletRequest

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javax.servlet.http.HttpServletRequest接口：
- HttpServletRequest是Servlet规范重要接口之一。
- 继承ServletReuest.
- HttpServletRequest接口的实现类由web容器实现。封装了Http请求协议的全部内容。
- HttpServletRequest生命周期短暂，只在一次请求中有效。

接口中常用方法：

String getParameter(String name);通过key获取value这个一维数组的首元素。
String[] getParameterValues(String name);通过map集合获取value
Map<String, String[]> getParameterMap();获取整个map集合
Enumeration<String> getParameterNames();获取整个map集合的key
getContextPath()
getMethod()
getRequestURI()
getRequestURL()
getServletPath
getRemoteAddr
Object getAttribute(String var1); 向HttpServletRequest获取数据
void setAttribute(String var1, Object var2);向HttpServletRequest添加数据
void removeAttribute(String var1); 向HttpServletRequest删除数据
-RequestDispatcher getRequestDispatcher（String path）;转发器

/** * Created by King on 2017/5/2. */@WebServlet(value ="/a")public class Myservlet extends HttpServlet {    @Override    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        response.setContentType("text/html;charset=UTF-8");        PrintWriter out = response.getWriter();        //获取上下文路径（webapp下）        String contextPath = request.getContextPath();        out.print("上下文路径 = " + contextPath);        out.print("<br>");        //获取浏览器请求方式        String method = request.getMethod();        out.print("method = " + method);        out.print("<br>");        //获取请求的URI        String requestURI = request.getRequestURI();        out.print("requestURI = " + requestURI);        out.print("<br>");        //获取请求的URL        String requestURL = request.getRequestURL().toString();        out.print("requestURL = " + requestURL);        out.print("<br>");        //获取servlet path        String servletPath = request.getServletPath();        out.print("servletPath = " + servletPath);        out.print("<br>");        //获取客户端IP地址        String remoteAddr = request.getRemoteAddr();        System.out.print(remoteAddr);        //执行A，跳转到B，将A和B执行放到同一个请求中，        //必须使用转发forward.         //获取请求转发器对象（以下转发器，指向了B servlet）        RequestDispatcher requestDispatcher = request.getRequestDispatcher("/b");        //调用请求转发器完成跳转        requestDispatcher.forward(request,response );    }}

上下文路径 = /servletmethod = GETrequestURI = /servlet/arequestURL = http://localhost:8080/servlet/aservletPath = /a

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