System.out.println("请求方式："+request.getMethod());System.out.println("客户IP："+request.getRemoteAddr());System.out.println("客户需要访问资源的URI："+request.getRequestURI());System.out.println("客户需要访问资源的URL："+request.getRequestURL());System.out.println("获得WEB应用的名称："+request.getContextPath());//获得具体访问的资源System.out.println("获得具体访问的资源");System.out.println(request.getRequestURI().substring(request.getContextPath().length()));
//获得头信息，单个元素String hader=request.getHeader("host");//获得头信息，键重复元素Enumeration<String> headers = request.getHeaders("host");while(headers.hasMoreElements()){System.out.println(headers.nextElement());}//获得所有头信息Enumeration<String> names = request.getHeaderNames();while(names.hasMoreElements()){String name=names.nextElement();System.out.println(name+":"+request.getHeader(name));}
//通过请求信息里的referer参数获取来源页面路径String header=request.getHeader("referer");//设置响应体和浏览器解码方式response.setContentType("text/html; charset=UTF-8");//获得response字符输出流PrintWriter writer = response.getWriter();//判断请求来源页面是否满足要求if(header!=null&&header.startsWith("http://localhost")){//满足要求正常输出页面writer.println("我是新闻");}else{//没有通过中正常途径访问，设置重定向会主页response.setStatus(302);response.sendRedirect("/Demo6/1.html");}
request.getParameter(String name);request.getParameterValues(String name);request.getParameterNames();request.getParameterMap();
//通过键去查找值String username=request.getParameter("username");String password=request.getParameter("password");System.out.println(username);System.out.println(password);//通过键去查找值，这种情况主要针对的是复选框，多个表单name相同的时候String[] hobby = request.getParameterValues("hobby");System.out.println(Arrays.toString(hobby));//获取页面提交的所有值，返回成一个map集合Map<String,String[]> info = request.getParameterMap();//通过获取键的方式来遍历集合Set<String> keySet = info.keySet();Iterator<String> it=keySet.iterator();while(it.hasNext()){String s=it.next();String[] value=info.get(s);//判断数组长度，长度小于等于1if(value.length<=1){System.out.println("key:"+s+" "+"value:"+value[0]);}else{//遍历String数组取出其中的值for(int i=0;i<value.length;i++){System.out.println("key:"+s+" "+"value:"+value[i]);}}}
request.getRequestDispatcher(path).forward(request,response);
//servlet2的输出内容为This is class com.heima.demo1.Servlet2request.getRequestDispatcher("/servlet2").include(request,response);//输出123123123123123123response.getWriter().write("123123123123123123!!!!!");
原文：http://www.cnblogs.com/didixyy/p/8ced5a3cd0ac7e27cb9b66b67b93988f.html