servlet

  1 package com.zdsofe.servlet1;
  2 
  3 import java.io.IOException;
  4 import java.io.PrintWriter;
  5 
  6 import javax.servlet.ServletConfig;
  7 import javax.servlet.ServletException;
  8 import javax.servlet.annotation.WebServlet;
  9 import javax.servlet.http.HttpServlet;
 10 import javax.servlet.http.HttpServletRequest;
 11 import javax.servlet.http.HttpServletResponse;
 12 
 13 /**
 14  * Servlet implementation class HelloServlet1
 15  */
 16 @WebServlet("/HelloServlet1")
 17 public class HelloServlet1 extends HttpServlet {
 18     private static final long serialVersionUID = 1L;
 19        
 20     /**
 21      * @see HttpServlet#HttpServlet()
 22      */
 23    /* public HelloServlet1() {
 24         super();
 25     }*/
 26 
 27     /**
 28      * @see Servlet#init(ServletConfig)
 29      */
 30     public void init(ServletConfig config) throws ServletException {
 31         System.out.println("初始化成功");
 32     }
 33 
 34     /**
 35      * @see Servlet#destroy()
 36      */
 37     public void destroy() {
 38         System.out.println("关闭页面时的时候，销毁servlet---");
 39     }
 40 
 41     /**
 42      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 43      */
 44     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 45         response.getWriter().print("偷偷图");
 46     } 
 47     
 48     /**
 49      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 50      */
 51     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 52         //设置请求字符编码
 53         request.setCharacterEncoding("utf-8");
 54         //设置响应字符编码
 55         response.setCharacterEncoding("utf-8");
 56         response.setContentType("text/html,charset=utf-8");
 57         //获取用户名
 58         String userName=request.getParameter("userName");
 59         //密码
 60         String password=request.getParameter("password");
 61         //获取客户端请求行中的uri
 62         String uri=request.getRequestURI();
 63         System.out.println(uri);
 64         //获取客户端请求行中的URL
 65         StringBuffer url=request.getRequestURL();
 66         System.out.println(url);
 67         //获取客户端IP
 68         String ip=request.getRemoteAddr();
 69         System.out.println(ip);
 70         //获取客户端完整主机名
 71         String host=request.getRemoteHost();
 72         System.out.println(host);
 73         //获取客户端端口号
 74         int port=request.getRemotePort();
 75         System.out.println(port);
 76         
 77         PrintWriter pWriter = response.getWriter();
 78         if("admin".equals(userName) && "123".equals(password))
 79         {
 80             pWriter.print(""+userName + ",successful!!!");    
 81         }
 82         else
 83         {
 84             /*pWriter.print("failed!");*/
 85             //请求转发，请求的地址栏不发生变化
 86         /*    request.getRequestDispatcher("/Pages/lianxi.html").forward(request, response);*/
 87             
 88             //请求重定向，地址栏URL改变
 89             
 90             response.sendRedirect("https://www.baidu.com");
 91             
 92             //在请求时添加参数
 93             /*String reStr="哈哈哈";
 94             RequestDispatcher dispatcher=request.getRequestDispatcher("/Pages/01.jsp?a="+reStr+"");
 95             dispatcher.forward(request, response);*/
 96         }
 97     }
 98     
 99     /**
100      * @see HttpServlet#doPut(HttpServletRequest, HttpServletResponse)
101      */
102     protected void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
103     }
104 
105 }

View Code

 1 <%@page import="java.text.SimpleDateFormat"%>
 2 <%@page import="java.util.Date"%>
 3 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 4     pageEncoding="ISO-8859-1"%>
 5 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 6 <html>
 7 <head>
 8 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 9 <title>Insert title here</title>
10 <%
11 String str=request.getParameter("a");
12 out.print("<font color='red'>"+str+"</font>");
13 %>
14 </head>
15 <script type="text/javascript" src=../js/dateFormat.js></script>
16 <script>
17   var a=new Date();  
18   alert("时间"+a.Format("yyyy-MM-dd hh:mm:ss"));
19 </script>
20 <%
21  Date a=new Date();
22  SimpleDateFormat s=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
23  out.print(s.format(a));
24 %>
25 <body>
26 
27 </body>
28 </html>

View Code

 1 <!DOCTYPE html>
 2 <html>
 3 <head>
 4 <meta charset="UTF-8">
 5 <title>Insert title here</title>
 6 </head>
 7 <body>
 8 <form action="../HelloServlet1" method="post">
 9 用户名：<input type="text" name="userName"/><br/>
10 密码：<input type="password" name="password"/><br/>
11 <button type="submit">提交</button>
12 </form>
13 </body>
14 </html>

View Code

//请求重定向，地址栏URL改变
String reStr="wer";
response.sendRedirect("/webProject1/Pages/01.jsp?a="+reStr+"");//路径必须要加工程名！

1、servlet的创建：

(1)如何在动态web项目中配置servlet请求：两种方式：

a。在web.xml中配置： <servlet> <servlet-name>主题servlet名称</servlet-name> <servlet-class>com.ser.servlet类名/</servlet-class> </servlet> <servlet-mapping> <servlet-name>主题servlet名称</servlet-name> <url-pattren>访问的servlet的url(/serv1)</url-pattren> </servlet-mapping>

b。@WebServlet({"/serv1","/serv2"}) ： servlet3.0版本支持的注解（一般在web。xml中顶部：版本信息：3.0）

(注意：上述的两种创建servlet的方式： web.xml中的url地址不能和注解后配置的地址一样，否则服务无法启动)

2、servlet的请求对象和响应对象 HttpServletRequest res:请求对象 res.getParameter("表单控件的name属性的值/url地址后面查询字符") res.setCharactEncoding("UTF-8"); res.getParameterValues("多选框或者单选框的name") res.getContextPath() :获取上下文路径 res.getHeaderName()；：获取所有请求头部的名称：返回的是Enumeration<String> res.getRealPath()/ res.getServletPath/ ....

//request的请求转发对象： res.getRequestDispatcher("页面路径").forward(res,resp);

HttpServletResponse :响应对象 PrintWriter out = resp.getWriter(); out.Print("打印的内容（html内容）"); out.flush();刷新 out.close(); 关闭输出流（打印的信息不会被清除） resp.setCharactEncoding("编码格式");：防止响应页面的中文出现乱码 resp.setContextType("text/html charset="utf-8""); 重定向页面：resp.sendRedirect("/工程名/页面路径")