Web 基础20 Filter 入门案例一 ~ 统一全站的编码
2018-04-05 本文已影响10人
小熊先生很不开心
1.1 首先使用普通方法进行
1.1.1 顺便说一下案例环境
这里我直接使用的是上次Session登录注销的案例用jsp改写的所以我这就直接放代码了不进行说明了。。。对不起
- 数据准备
package com.itbear.domain;
public class User {
private String name;
private String password;
public User() {
super();
// TODO Auto-generated constructor stub
}
public User(String name, String password) {
super();
this.name = name;
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User [name=" + name + ", password=" + password + "]";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result
+ ((password == null) ? 0 : password.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
User other = (User) obj;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (password == null) {
if (other.password != null)
return false;
} else if (!password.equals(other.password))
return false;
return true;
}
}
package com.itbear.domain;
import java.util.ArrayList;
import java.util.List;
public class UseDB {
private static List<User> users = new ArrayList<User>();
static {
users.add(new User("itcast","123456"));
users.add(new User("itheima","123456"));
users.add(new User("zhangsan","123456"));
}
public static List<User> getUsers(){
return users;
}
}
- 首页
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>这里是小熊先生的个人主页</h1>
<c:choose>
<c:when test="${user == null }">
<h4>先完成登录</h4>
<a href="${pageContext.request.contextPath }/login.jsp">登录</a>
</c:when>
<c:otherwise>
<h4>登录完成</h4>
<a href="${pageContext.request.contextPath }/Loginout">登出</a>
</c:otherwise>
</c:choose>
<a href="${pageContext.request.contextPath}/importance/importance.html">很重要的资源</a>
</body>
</html>
- 登录页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/LoginServlet" method="post">
用户名<input type="text" name="name" >
密码<input type="password" name="password">
<input type="submit" value="提交">
</form>
</body>
</html>
- 登录Servlet
package com.itbear.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.itbear.domain.UseDB;
import com.itbear.domain.User;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public LoginServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name = request.getParameter("name");
String pwd = request.getParameter("password");
PrintWriter out = response.getWriter();
User user = new User(name, pwd);
List<User> users = UseDB.getUsers();
boolean flag = users.contains(user);
if(flag){
out.println("登录成功，3秒后跳转");
response.setHeader("Refresh", "3;URL=index.jsp");
HttpSession session = request.getSession();
session.setAttribute("user", user);
}else{
out.println("登录失败，3秒后跳转");
response.setHeader("Refresh", "3;URL=login.jsp");
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
- 注销Servlet
package com.itbear.domain;
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;
/**
* Servlet implementation class LoginOut
*/
public class LoginOut extends HttpServlet {
private static final long serialVersionUID = 1L;
public LoginOut() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
HttpSession session = request.getSession();
session.invalidate();
out.println("注销完成");
response.setHeader("Refresh", "3;URL=/mySession/index.jsp");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
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