MVC设计模式实现权限管理登录，超详细

功能实现：在页面输入给定的用户名之一，可以显示当前用户的权限，也可以在页面更改该用户的权限，更新之后保存。像下面这样。

MVC设计模式实现权限管理登录，超详细

填写用户名提交：

MVC设计模式实现权限管理登录，超详细

显示用户AAA的权限：

MVC设计模式实现权限管理登录，超详细

修改权限（增加article3）：

MVC设计模式实现权限管理登录，超详细

点击Update之后，权限更新，下次访问，输入用户名AAA提交后显示：

MVC设计模式实现权限管理登录，超详细

提交用户名，显示用户权限和修改用户权限页面：authority-manager.jsp

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

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%

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 'authority-manager.jsp' starting page</title>

	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

	<!--

	<link rel="stylesheet" type="text/css" href="styles.css">

	-->

  </head>

  <body>

    <center>

    <br><br>

    <form action="AuthorityServlet?method=getAuthorities" method="post">

      name:<input type="text" name="username"/>

      <input type="submit" value="Submit"/>

    </form>

    <c:if test="${requestScope.user!=null }">

       <br><br>

       ${requestScope.user.username}的权限是：

       <br><br>

       <form action="AuthorityServlet?method=updateAuthorities" method="post">

         <input type="hidden" name="username" value="${requestScope.user.username}"/>

         <br><br>

         <!-- 两个循环：外层循环先将权限都列出来，内层循环用于将对应用户的对应权限 -->

         <c:forEach items="${authorities}" var="auth">

           <c:set var="flag" value="false"></c:set>

           <c:forEach items="${user.authorities}" var="ua">

             <c:if test="${ua.url==auth.url }">

               <c:set var="flag" value="true"></c:set>

             </c:if>

           </c:forEach>

           <c:if test="${flag==true}">

             <input type="checkbox" name="authority" value="${auth.url}" checked="checked"/>${auth.displayname}

           </c:if>

           <c:if test="${flag==false}">

             <input type="checkbox" name="authority" value="${auth.url}" />${auth.displayname}

           </c:if>

           <br><br>

         </c:forEach>

         <input type="submit" value="Update">

       </form>

    </c:if>

    </center>

  </body>

</html>

Servlet实现类，AuthorityServlet.java

package javaweb.com.anthorityManage;

import java.io.IOException;

import java.io.PrintWriter;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class AuthorityServlet extends HttpServlet {

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

        //authority-manager.jsp中的method参数-->getAuthorities

		String methodName=request.getParameter("method");

        try {

        	//getClass-->Class型对象，获得权限为public的内部类（即为public class AuthorityServlet）

        	//getMethod返回Method类型的对象，每个Method类型的对象代表一个方法

        	//getMethod(String方法名称,入口参数类型1.class,入口参数类型2.class)-->访问指定名称和参数类型的方法

			Method method=getClass().getMethod(methodName, HttpServletRequest.class,HttpServletResponse.class);

			//invoke(Object obj,Object...args)-->利用指定参数args执行指定对象obj中的该方法，返回值为Object型

			//利用指定参数request，response执行method方法

			method.invoke(this, request,response);

		} catch (NoSuchMethodException | SecurityException e) {

			e.printStackTrace();

		} catch (IllegalAccessException e) {

			e.printStackTrace();

		} catch (IllegalArgumentException e) {

			e.printStackTrace();

		} catch (InvocationTargetException e) {

			e.printStackTrace();

		}

	}

	private UserDao userDao=new UserDao();

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

		//从请求参数中获取用户名

		String username=request.getParameter("username");

	    //从userDao中获取用户名(带有用户的权限信息)

		User user=userDao.get(username);

		//将userDao中获得的用户名传递给request请求

		request.setAttribute("user",user);

		//userDao中获取的权限信息添加到request中

		request.setAttribute("authorities", userDao.getAuthorities());

		//按照用户名转发到相应的权限管理页面

		request.getRequestDispatcher("/jspTest/authority-manager.jsp").forward(request, response);

	}

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

		//从请求域获得用户名和相应的多个权限

		String username=request.getParameter("username");

		//从客户端request域获得的权限

		String[] authorities=request.getParameterValues("authority");

		List<Authority> authorityList=userDao.getAuthorities(authorities);

		userDao.update(username, authorityList);

		//request.getContextPath()-->返回站点的根路径

		response.sendRedirect(request.getContextPath()+"/jspTest/authority-manager.jsp");

	}

}

UserDao类执行具体的事务操作，UserDao.java

package javaweb.com.anthorityManage;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

//UserDao类执行具体的事务操作

public class UserDao {

	private static Map<String,User> users;

	private static List<Authority> authorities;

	static{

		authorities=new ArrayList<>();

		authorities.add(new Authority("article-1","/jspTest/1.jsp"));

	    authorities.add(new Authority("article-2","/jspTest/2.jsp"));

	    authorities.add(new Authority("article-3","/jspTest/3.jsp"));

	    authorities.add(new Authority("article-4","/jspTest/4.jsp"));

		users=new HashMap<String,User>();

	    User user1=new User("AAA",authorities.subList(0,2));

	    users.put("AAA",user1);

	    User user2=new User("BBB",authorities.subList(2,4));

	    users.put("BBB",user2);

	}

	//相当于String m1(){}  获得users中的用户姓名

	User get(String username){

		return users.get(username);

	}

	//更新用户的权限

	void update(String username,List<Authority> authorities){

		users.get(username).setAuthorities(authorities);

	}

	public List<Authority> getAuthorities(){

		return authorities;

	}

	public List<Authority> getAuthorities(String[] urls){

		List<Authority> authorities2=new ArrayList<>();

		for(Authority authority:authorities){

			if(urls!=null){

				for(String url:urls){

					//遍历比较，如果url(请求域的)==权限中存储的url，则将请求域的权限添加到authorities2中成为某个用户名的权限

					if(url.equals(authority.getUrl())){

						authorities2.add(authority);

					}

				}

			}

		}

		return authorities2;

	}

}

在web.xml中进行配置：

  <servlet>

    <servlet-name>AuthorityServlet</servlet-name>

    <servlet-class>javaweb.com.anthorityManage.AuthorityServlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>AuthorityServlet</servlet-name>

    <url-pattern>/AuthorityServlet</url-pattern>

  </servlet-mapping>

Authority.java

package javaweb.com.anthorityManage;

public class Authority {

	private String displayname;

	private String url;

	public String getDisplayname() {

		return displayname;

	}

	public void setDisplayname(String displayname) {

		this.displayname = displayname;

	}

	public String getUrl() {

		return url;

	}

	public void setUrl(String url) {

		this.url = url;

	}

	public Authority(String displayname, String url) {

		super();

		this.displayname = displayname;

		this.url = url;

	}

	public Authority(){}

}

User.java

package javaweb.com.anthorityManage;

import java.util.List;

public class User {

	private String username;

	private List<Authority> authorities;

	public String getUsername() {

		return username;

	}

	public void setUsername(String username) {

		this.username = username;

	}

	public List<Authority> getAuthorities() {

		return authorities;

	}

	public void setAuthorities(List<Authority> authorities) {

		this.authorities = authorities;

	}

	public User(String username, List<Authority> authorities) {

		super();

		this.username = username;

		this.authorities = authorities;

	}

	public User(){}

}

AuthorityServlet.jsp中的form表单：

<form action="AuthorityServlet?method=getAuthorities" method="post">

    name:<input type="text" name="username"/>

    <input type="submit" value="Submit"/>

</form>

1.form表单提交到Servlet的映射地址AuthorityServlet中，在web.xml中可以读取到相应的Servlet为javaweb.com.anthorityManage.AuthorityServlet;

2.AuthorityServlet.java调用doPost()方法处理请求，String methodName=request.getParameter("method");从请求域request中读取到method的参数为getAuthorities,Method method=getClass().getMethod(methodName, HttpServletRequest.class,HttpServletResponse.class);访问指定名称和参数类型的方法，即开始执行AuthorityServlet类中的getAuthorities(HttpServletRequest request, HttpServletResponse response)方法；

3.AuthorityServlet类中的getAuthorities(HttpServletRequest request, HttpServletResponse response)方法实现的功能是：

String username=request.getParameter("username");从请求域中获取参数，得到请求域中用户提交的用户名。User user=userDao.get(username);根据得到的用户名username在userDao中获取数据库中存取的用户名。之后将userDao中获取的用户名及对应的权限信息提交给request，并且转发到相应的权限管理界面authority-manager.jsp。

4.在权限管理界面authority-manager.jsp，重复执行1,2步，在第2步中访问到的方法为AuthorityServlet类中的updateAuthorities(HttpServletRequest request, HttpServletResponse response)。

5.在updateAuthorities(HttpServletRequest request, HttpServletResponse response)方法中先从请求域中获得用户名及相应的权限信息，List<Authority> authorityList=userDao.getAuthorities(authorities);调用userDao中的getAuthorities(authorities)方法，即如下代码：

public List<Authority> getAuthorities(String[] urls){

		List<Authority> authorities2=new ArrayList<>();

		for(Authority authority:authorities){

			if(urls!=null){

				for(String url:urls){

					//遍历比较，如果url(请求域的)==权限中存储的url，则将请求域的权限添加到authorities2中成为某个用户名的权限

					//由URL识别代表权限

					if(url.equals(authority.getUrl())){

						authorities2.add(authority);

					}

				}

			}

		}

		return authorities2;

	}

上述代码实现的功能是根据Url识别权限，如果url(请求域的)==权限中存储的url，则将请求域的权限添加到authorities2中成为某个用户名的权限。

6.userDao.update(username, authorityList);更新用户的权限信息。

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MVC设计模式实现权限管理登录，超详细

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