代碼塊
```package com.foreknow.controller;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *RequestInfoServlet接口： 提取HTTP請求報頭信息
 * @author Administrator
 *
 */
public class RequestInfoServlet extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //服務(wù)器端先客戶端響應(yīng)的內(nèi)容的類型
        resp.setContentType("text/html;charset=utf-8");
        
        //req.getContextPath();獲取上下文的路徑（當(dāng)前項目的路徑）
        String contextPath=req.getContextPath();
        
        //PrintWriter可以在網(wǎng)頁中輸出內(nèi)容
        PrintWriter out=resp.getWriter();
        out.println("獲取工程路徑："+contextPath+"<br>");
        out.println("獲取客戶端向服務(wù)器端請求的方法："+req.getMethod()+"<br>");
        out.println("servlet的映射地址："+req.getRequestURI());
        out.flush();
        out.close();
    }
    
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        
    }

}