servlet(2) Cookie DataUtil LastDataServlet ReadCookieServlet GetCGIServlet LoginServlet
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
</head>
<form action="./servlet/LoginServlet" method="post">
<body>
员工信息录入<br/>
用户名：<input type="text" value="" name="username" /> <br/>
密码：<input type="password" name="psw"/> <br/>
保存用户名和密码<input type="checkbox" name="save" value="yes" /><br/>
性别：<input type="radio" name="sex" value="男"/>男
<input type="radio" name="sex" value="女"/>女 <br/>
学历：<select name="edu">
<option value="硕士研究生">硕士研究生</option>
<option value="博士研究生">博士研究生</option>
<option value="本科生">本科生</option>
</select><br/>
爱好：<br/><input type="checkbox" name="love" value="睡觉">睡觉<br/>
<input type="checkbox" name="love" value="学习">学习<br/>
<input type="checkbox" name="love" value="交友">交友<br/>
<input type="checkbox" name="love" value="旅游">旅游<br/>
全选/全不选 <input type="checkbox" name="checkall" value="yes"><br/>
描述：<textarea rows="10" cols="10" name="des"></textarea>
多框：<select name="items" multiple="multiple" size="6">
<option value="选项1">选项1</option>
<option value="选项2">选项2</option>
<option value="选项3">选项3</option>
<option value="选项4">选项4</option>
<option value="选项5">选项5</option>
<option value="选项6">选项6</option>
</select><br/>
<input type="submit" value="保存" />
</body>
</form>
</html>
2. web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>day09.LoginServlet</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>GetCGIServlet</servlet-name>
<servlet-class>day09.GetCGIServlet</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>ReadCookieServlet</servlet-name>
<servlet-class>day09.ReadCookieServlet</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>LastDateServlet</servlet-name>
<servlet-class>day09.LastDateServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/servlet/LoginServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>GetCGIServlet</servlet-name>
<url-pattern>/servlet/GetCGIServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ReadCookieServlet</servlet-name>
<url-pattern>/servlet/ReadCookieServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>LastDateServlet</servlet-name>
<url-pattern>/LastDateServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
3.LoginServlet
package day09;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public LoginServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
/*
* request 封装了客户端的所有请求信息
* response 封装了客户端的所有响应信息
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
//创建cookie
Cookie usernameCookie=new Cookie("username","admin");
//服务器在响应头中设置cookie
response.addCookie(usernameCookie);
/*
* 设置cookie为持久Cookie
* 7天;setMaxAge()以秒为单位
*/
usernameCookie.setMaxAge(7*24*3600);
/*
* 设置路径，使cookie在整个路径都好用
*/
String contextPath=request.getContextPath();
usernameCookie.setPath(contextPath);
System.out.println("request:"+request);
//获取请求方法
String method=request.getMethod();
System.out.println("method:"+method);
String username=request.getParameter("username");
String psw=request.getParameter("psw");
String usernameValue="";
String pswValue="";
Cookie[] cookies=request.getCookies();
if(cookies!=null&&cookies.length>0){
for(int i=0;i<cookies.length;i++){
Cookie cookie=cookies[i];
//System.out.println("cookie的名称："+cookie.getName());
if("username".equals(cookie.getName())){
usernameValue=cookie.getValue();
}
if("psw".equals(cookie.getName())){
pswValue=cookie.getValue();
}
}
}
@SuppressWarnings("unused")
Cookie usernameCookie2=null;
if(username!=null&&!"".equals(username.trim())){
usernameCookie2=new Cookie("username",username.trim());
}
@SuppressWarnings("unused")
Cookie pswCookie2=null;
if(psw!=null&&!"".equals(psw.trim())){
pswCookie2=new Cookie("psw",psw.trim());
}
String saveCookie=request.getParameter("save");
if(saveCookie!=null){
System.out.println("saveCookie被选中");
if(usernameCookie2!=null){
usernameCookie2.setMaxAge(7*24*3600);
}
if(pswCookie2!=null){
pswCookie2.setMaxAge(7*24*3600);
}
}else{
System.out.println("saveCookie没被选中");
if(usernameCookie2!=null){
usernameCookie2.setMaxAge(0);
}
if(pswCookie2!=null){
pswCookie2.setMaxAge(0);
}
}
//加入Cookie到应答头
if(usernameCookie2!=null){
response.addCookie(usernameCookie2);
}
if(pswCookie2!=null){
response.addCookie(pswCookie2);
}
String sex=request.getParameter("sex");
String edu=request.getParameter("edu");
String[] items=request.getParameterValues("items");
String[] love=request.getParameterValues("love");
String checkall=request.getParameter("checkall");
if(checkall==null){
System.out.println("复选框没有被全选中！");
}
String des=request.getParameter("des");
//////********************************************
/*
* radio按钮，checkbox按钮，多选，下拉选，若没被选中，
* 则在服务器端获取不到。
*/
Enumeration<String> em=request.getParameterNames();
while(em.hasMoreElements()){
String name=em.nextElement();
String[] value=request.getParameterValues(name);
if(value!=null&&value.length>0){
for(int i=0;i<value.length;i++)
out.println(name+"~~~"+value[i]+"<br/>");
}
}
/***********
* Map<String,String[]>
* 第一个String:表示form表单中的name
* 第二个String[]:表示value
*/
Map<String,String[]> map=request.getParameterMap();
Set set=map.keySet();
Iterator<String> it=set.iterator();
while(it.hasNext()){
String key=it.next();
String[] nameValue=map.get(key);
if(nameValue!=null&&nameValue.length>0){
for(int i=0;i<nameValue.length;i++)
out.println(key+"~~~"+nameValue[i]+"<br/>");
}
}
/***********
* 获取请求头信息
*/
Enumeration<String> header=request.getHeaderNames();
while(header.hasMoreElements()){
String headerName=header.nextElement();
String headerValue=request.getHeader(headerName);
out.println(headerName+"~~~"+headerValue);
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
4.GetCGIServlet
package day09;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class GetCGIServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public GetCGIServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
//从响应对象中获取字符输出流
PrintWriter out = response.getWriter();
//从响应对象中获取字符输出流（下载，处理图片等二进制的信息）
//OutputStream outstream=response.getOutputStream();
//获取cgi变量
//获取web应用上下文*********
String contextPath=request.getContextPath();
out.println("contextPath= "+contextPath);
//获取远程IP***********
String remoteIP=request.getRemoteAddr();
out.println("remoteIP= "+remoteIP);
//获取查询字符串
String queryString=request.getQueryString();
out.println("queryString= "+queryString);
//获取servlet名称************
String servletPath=request.getServletPath();
out.println("servletPath= "+servletPath);
//获取url
String url=request.getRequestURI();
out.println("url= "+url);
//获取uri
String uri=request.getRequestURI();
out.println("uri= "+uri);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
5.ReadCookieServlet
package day09;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ReadCookieServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public ReadCookieServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
//获取浏览器传递过来的cookie
Cookie[] cookies=request.getCookies();
if(cookies!=null&&cookies.length>0){
for(int i=0;i<cookies.length;i++){
Cookie cookie=cookies[i];
System.out.println("cookie的名称："+cookie.getName());
if("username".equals(cookie.getName())){
out.println("客户端传过来的Cookie= "+cookie.getValue());
}
}
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
6.LastDataServlet
package day09;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import day09util.DataUtil;
public class LastDateServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public LastDateServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
Cookie lastData=new Cookie("lastdate",DataUtil.getDateStr());
//设置cookie保存时间，加入应答头
lastData.setMaxAge(365*24*60*60);
response.addCookie(lastData);
//获取客户端传递过来的cookie
Cookie[] cookies=request.getCookies();
if(cookies!=null&&cookies.length>0){
for(int i=0;i<cookies.length;i++){
Cookie cookie=cookies[i];
System.out.println("cookie的名称："+cookie.getName());
if("lastdate".equals(cookie.getName())){
out.println("客户端传过来的Cookie= "+cookie.getValue());
}
}
}
}
}
7.DataUtil
package day09util;
import java.text.SimpleDateFormat;
import java.util.Date;
public class DataUtil {
/*
* 获取日期格式
*/
public static String getDateStr(){
String str=null;
SimpleDateFormat sf=new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
str=sf.format(new Date());
return str;
}
public static void main(String[] args) {
System.out.println(getDateStr());
}
}