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Servlet之Cookie相关操作

2015-09-15 21:46 453 查看

这里主要讲解cookie的添加和读取

工程中涉及到的servlet的配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 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_3_0.xsd"> <display-name></display-name>
<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>AServlet</servlet-name>
<servlet-class>AServlet</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>BServlet</servlet-name>
<servlet-class>BServlet</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>CServlet</servlet-name>
<servlet-class>CServlet</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>DServlet</servlet-name>
<servlet-class>DServlet</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>LoginServlet</servlet-name>
<servlet-class>LoginServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>AServlet</servlet-name>
<url-pattern>/a</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>BServlet</servlet-name>
<url-pattern>/b</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CServlet</servlet-name>
<url-pattern>/c</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>DServlet</servlet-name>
<url-pattern>/d</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/loginServlet</url-pattern>
</servlet-mapping>

</web-app>

会话session属性的设置与读取

import java.io.IOException;
import java.io.PrintWriter;

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

public class AServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");
PrintWriter out = response.getWriter();
HttpSession session=request.getSession();
session.setAttribute("name", "李婉琳");

request.getRequestDispatcher("b").forward(request, response);
//		response.sendRedirect("/web/b");
}

}

import java.io.IOException;

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

public class BServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");

System.out.println("session : "+request.getSession().getAttribute("name"));
request.getRequestDispatcher("/index.jsp").forward(request, response);

}

}

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>

<body>
name:
<%=session.getAttribute("name") %>
</body>
</html>

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 CServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");
PrintWriter out = response.getWriter();

Cookie cookie=new Cookie("p1", "v1");
cookie.setMaxAge(10);

response.addCookie(cookie);

request.getRequestDispatcher("d").forward(request, response);
}

}

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 DServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");
doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");
PrintWriter out = response.getWriter();

Cookie[] cookies=request.getCookies();
for(Cookie cookie:cookies){
System.out.println("**********************************");
System.out.println("cookie name : "+cookie.getName());
System.out.println("cookie value : "+ cookie.getValue());
System.out.println("----------------------------------");
}
}

}

通过cookie保存登录信息

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 LoginServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");
PrintWriter out = response.getWriter();
String username=request.getParameter("username");
String password=request.getParameter("password");

Cookie cookie1=new Cookie("username", username);
Cookie cookie2=new Cookie("password", password);
response.addCookie(cookie1);
response.addCookie(cookie2);

}

}

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>My JSP 'login.jsp' starting page</title>
</head>

<body>
<%
Cookie[] cookies = request.getCookies();

String username = "";
String password = "";
if (cookies != null) {
for (Cookie cookie : cookies) {

if (cookie.getName() != null
&& cookie.getName().equals("username")) {
username = cookie.getValue();
}
if (cookie.getName() != null
&& cookie.getName().equals("password")) {
password = cookie.getValue();
}
}
}
%>

<form action="loginServlet">
<input type="text" name="username" value="<%=username%>" /><br>
<input type="password" name="password" value="<%=password%>" /><br>
<input type="submit" value="提交" />
</form>
</body>
</html>

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