HttpServletRequest
1 @Override 2 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 3 4 /*解决请求乱码*/ 5 request.setCharacterEncoding("UTF-8"); 6 7 /*常用方法*/ 8 /*获取项目名*/ 9 System.out.println("项目名:"+request.getContentType()); 10 /*获取客户机的地址*/ 11 System.out.println("客户机的地址:" + request.getRemoteAddr()+":"+request.getRemotePort()); 12 13 /*获取请求头的信息*/ 14 15 /*获取请求方式是*/ 16 System.out.println("请求方式:"+request.getMethod()); 17 18 /*获取请求的web项目名*/ 19 System.out.println("web项目名:"+request.getContextPath()); 20 21 /*获取指定名称请求头*/ 22 System.out.println("User-Agent头:"+request.getHeader("User-Agent")); 23 24 /*获取所有的请求头的key*/ 25 Enumeration<String> headerNames = request.getHeaderNames(); 26 while (headerNames.hasMoreElements()) { 27 String s = headerNames.nextElement(); 28 System.out.println(s + ":" + request.getHeader(s)); 29 } 30 31 32 /*获取请求体的信息*/ 33 /*获取参数的Map集合*/ 34 Map<String, String[]> parameterMap = request.getParameterMap(); 35 Set<Map.Entry<String, String[]>> entries = parameterMap.entrySet(); 36 for (Map.Entry<String, String[]> s : entries) { 37 String key = s.getKey(); 38 String[] val = s.getValue(); 39 System.out.println(key + ":" + Arrays.toString(val)); 40 } 41 42 /*获取数据*/ 43 String name = request.getParameter("name"); 44 String pwd = request.getParameter("pwd"); 45 System.out.println(name + ":" + pwd); 46 47 48 /*request的域对象*/ 49 /*声明周期：一次请求*/ 50 request.setAttribute("name","杨淏宇"); 51 System.out.println(request.getAttribute("name")); 52 /*请求转发*/ 53 /*注意请求转发的路径不需要写项目名称*/ 54 request.getRequestDispatcher("/demo.jsp").forward(request,response); 55 /*请求转发和重定向的区别： 56 * 请求转发：请求服务器一次,地址栏不发生变化,适用于有参数的时候,服务器行为 57 * 重定向：请求服务器两次,地址栏发生变化,使用于无参数的时候,浏览器行为 58 */ 59 60 } 61 62 @Override 63 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 64 doPost(request, response); 65 }
注意：tomcat 8 后不用解决请求乱码：
之前post用：request.setCharacterEncoding("UTF-8");
get用：parameter = new String(parameter.getBytes(“iso8859-1”),”UTF-8”); 注意只能解决一个乱码
