实验7 JSP

ゝ一世哀愁。 2022-03-31 05:38 139阅读 0赞

设计一个简单的基于Web的留言板，要求：1）系统中所有页面，如果用户没登录，则让用户返回到登录页面login.jsp（说明：login.jsp页面填写用户的用户名和密码）；2）留言板（message.jsp）页面中以表格的形式（留言者用户名、留言标题、留言时间）显示出所有的用户留言，点击一个标题后，可以在新页面（showmessage.jsp）中显示留言的内容；3）在留言页面addMessage.jsp可以添加新的留言。留言包括：标题、内容。

说明：（1）采用JSP+JavaBean结构；（2）所有的留言内容需要存储到服务器的文件中。

<%@ page language="java" contentType="text/html; charset=utf-8"
        pageEncoding="utf-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="utf-8">
    <title>登录</title>
    <link rel="stylesheet" href="css/amazeui.min.css">
      <link rel="stylesheet" href="css/app.css">
    </head>
    <body background="img/5.jpg"
    	style="background-repeat: no-repeat; background-size: cover; background-attachment: fixed;"
    	text="#68228B" >
    	<div class="am-g myapp-login">
    		 <div class="myapp-login-logo">
    		 	<i class="am-icon-stumbleupon"></i>
    		 </div>
    		 <div class="am-u-sm-10 myapp-login-form">
    		 	<form class="am-form" action="LoginServe" method="POST">
    			    <div class="am-form-group">
    			      <input type="text"  value="请输入用户名 " name="id">
    			    </div>
    			    <div class="am-form-group">
    			      <input type="password" value="123456" name="password">
    			    </div> 
    			      <p style="color:green">默认密码为123456</p>
    			    <p><button type="submit" class="am-btn am-btn-default">Login</button></p>
    
    			</form>
    		 </div>
    	</div>
    </body>
    </html>

message.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
        pageEncoding="utf-8" %>
    
    <%@page import="java.util.*,com.whh.www.*" %>
    <%! String id;
    	String title;
    	Date time;
    %>
    <!DOCTYPE html>
    <html>
    <head>
    <title>主界面</title>
    </head>
    <body>
    	
      		<table >
      			<caption>所有留言信息</caption>
      			<tr><th>留言ID</th><th>留言时间</th>
    				<th>留言标题</th></tr>
      		 <%
      		if(messageRecord.record!=null){
      			Iterator iter=messageRecord.record.iterator();
      			while(iter.hasNext()){
      				Mess mb=(Mess)iter.next();
    				
      		%><tr><td><%=mb.getId() %></td>
      					<td><%= mb.getTime() %></td>
      					<td><a href="showMessage.jsp?number=<%= mb.getNumber()%>"><%= mb.getTitle() %></a></td>
      		<%	}
      		} %> 
      		</table>
      		<br>
      		<%if(request.getSession().getAttribute("id")==null){
      			response.sendRedirect("Login.jsp");
      		}
      		%>
      		<br>
      		<br>
      	
      	  	<a style="margin-left:22%" href="addmessage.jsp">留言</a>
    </body>
    </html>

addmessage.jsp

<%@ page language="java"  contentType="text/html; charset=utf-8"
        pageEncoding="utf-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="utf-8">
    <title>留言</title>
    </head>
    <body>
    	 <h1 >请留言</h1>
       <form action="leaveMessageServlet" method="post">
      			<table style="margin-left: 37%" border="1">
      			<caption>填写留言信息</caption>
      		    	<tr><td>留言标题</td>
      				<td><input type="text" name="title"/></td></tr>
      			<tr><td>留言内容</td>
      				<td><textarea name="message" rows="5" cols="35"></textarea></td>
    			</tr>
      			</table>
      		<input type="submit" value="提交"/>
      		<input type="reset" value="重置"/>
      	</form>
        <a href="message.jsp">返回留言板界面</a>
    </body>
    </html>

showmessage.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
        pageEncoding="utf-8"%>
        <%@page import="java.util.*,com.whh.www.*" %>
    <!DOCTYPE html>
    <html>
    <head>
    <%
    if(request.getSession().getAttribute("id")==null){
    		response.sendRedirect("Login.jsp");
    }
    %>
    <title><%=messageRecord.mp.get(Integer.parseInt(request.getParameter("number"))).getTitle() %></title>
    </head>
    <body>
    	标题：<%=messageRecord.mp.get(Integer.parseInt(request.getParameter("number"))).getTitle() %>
    	<br>
    	<br>
    	内容：<%=messageRecord.mp.get(Integer.parseInt(request.getParameter("number"))).getMessage()%>
    </body>
    </html>

success.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
        pageEncoding="utf-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    
    <title>Success</title>
    </head>
    <body>
    	<div style="margin-left:42%;margin-top:240px;font-family:Microsoft YaHei" >
    		留言成功，单击<a href="message.jsp">这里</a>返回主界面。
    	</div>
    
    </body>
    </html>

error.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
        pageEncoding="utf-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <title>Error</title>
    </head>
    <body>
    	 <body bgcolor="#ddd" style="font-family:Microsoft YaHei">
      <div style="text-align:center;margin-top:130px">
        <p>输入的用户名不存在或者密码错误</p>
        <a href="Login.jsp">点我返回登陆界面</a>
        </div>
    </body>
    </html>

LoginServlet

package com.whh.www;
    
    
    import java.io.*;
    
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.util.HashMap;
    import java.util.Map;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    
    
    /**
     * Servlet implementation class LoginServe
     */
    @WebServlet("/LoginServe")
    public class LoginServe extends HttpServlet {
    	private static final long serialVersionUID = 1L;
    	
    	Map<String,String> mp=new HashMap<String,String>();
        /**
         * @see HttpServlet#HttpServlet()
         */
        public LoginServe() {
            super();
            // TODO Auto-generated constructor stub
        }
        public void init() {
        	@SuppressWarnings("resource")
    		String path=this.getServletContext().getRealPath("/WEB-INF/user.txt");
        	String path2=this.getServletContext().getRealPath("/WEB-INF/message.txt");
    		InputStreamReader fis = null,fis2=null;
    		try {
    			fis = new InputStreamReader(new FileInputStream(path));
    			fis2= new InputStreamReader(new FileInputStream(path2));
    		} catch (FileNotFoundException e1) {
    			// TODO Auto-generated catch block
    			e1.printStackTrace();
    		} 
    		BufferedReader in=new BufferedReader(fis);
    		BufferedReader ins=new BufferedReader(fis2);
    		String a[]=new String[3];
    		String b[]=new String[5];
        	String line = null;
        	while(true) {
        		try {
    				line=in.readLine();
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
        		if(line==null)break;
        		a=line.split("#");
        		mp.put(a[0],a[1]);
        	}
        	while(true) {
        		try {
    				line=ins.readLine();
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
        		if(line==null)break;
        		b=line.split("#");
        		Mess mb=new Mess();
        		mb.setId(b[0]);
        		mb.setTime(b[1]);
        		mb.setTitle(b[2]);
        		mb.setMessage(b[3]);
        		mb.setNumber(Integer.parseInt(b[4]));
        		messageRecord.mp.put(mb.getNumber(),mb);
        	}
        	try {
    			in.close();
    			ins.close();
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
        	
        }
    	/**
    	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
    	 */
    	
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		String id="";
    		id=request.getParameter("id");
    		String password=request.getParameter("password");
    		String s="";
    		if(mp.containsKey(id)) {
    			if(mp.get(id).equals(password)) {
    				s+=mp.get(id);
    			}
    		}
    		if(s!="") {
    			request.getSession().setAttribute("id", id);
    			request.getRequestDispatcher("message.jsp").forward(request,response); 
    		}
    		else response.sendRedirect("Error.jsp");
    	}
    
    	/**
    	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		doGet(request, response);
    	}
    
    }

leaveMessageServlet

package com.whh.www;
    
    
    import java.io.IOException;
    import java.util.Date;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * Servlet implementation class leaveMessageServlet
     */
    @WebServlet("/leaveMessageServlet")
    public class leaveMessageServlet extends HttpServlet {
    	private static final long serialVersionUID = 1L;
           
        /**
         * @see HttpServlet#HttpServlet()
         */
        public leaveMessageServlet() {
            super();
            // TODO Auto-generated constructor stub
        }
    
    	/**
    	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		request.setCharacterEncoding("utf-8");
    		String id=(String) request.getSession().getAttribute("id");
    		String title=request.getParameter("title");
    		String message=request.getParameter("message");
    		Mess mb=new Mess();
    		mb.setId(id);
    		mb.setTime(new Date(System.currentTimeMillis()).toString());
    		mb.setTitle(title);
    		mb.setMessage(message);
    		messageRecord.add(mb);
    		String path=this.getServletContext().getRealPath("/WEB-INF/message.txt");
    		System.out.println(path);
    		if(save.Save(mb,path)) {
    			request.getSession().setAttribute("mb", mb);
    			response.sendRedirect("success.jsp") ;
    		}
    		else response.sendRedirect("message.jsp");
    	}
    
    	/**
    	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		doGet(request, response);
    	}
    
    }

Mess

package com.whh.www;
    
    
    public class Mess {
    	private int number;
    	private String id;
    	private String title;
    	private String time;
    	private String message;
    	public String getId() {
    		return id;
    	}
    	public void setId(String id) {
    		this.id = id;
    	}
    	public String getTitle() {
    		return title;
    	}
    	public void setTitle(String title) {
    		this.title = title;
    	}
    	public String getMessage() {
    		return message;
    	}
    	public void setMessage(String message) {
    		this.message = message;
    	}
    	public String getTime() {
    		return time;
    	}
    	public void setTime(String time) {
    		this.time = time;
    	}
    	public int getNumber() {
    		return number;
    	}
    	public void setNumber(int number) {
    		this.number = number;
    	}
    }

save

package com.whh.www;
    
    import java.io.*;
    public class save {
    	public static boolean Save(Mess mb,String path) throws IOException {
    		String id=mb.getId();
    		String title=mb.getTitle();
    		String message=mb.getMessage();
    		String time=mb.getTime();
    		int number=mb.getNumber();
    		try {
    			PrintWriter out=new PrintWriter(new FileWriter(path,true));
    			out.println(id+"#"+time+"#"+title+"#"+message+"#"+number);
    			out.close();
    			return true;
    		} catch (FileNotFoundException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    			return false;
    		}
    	}
    }

messageRecord

package com.whh.www;
    import java.util.*;
    
    public class messageRecord {
    	public static ArrayList<Mess> record=new ArrayList<Mess>();
    	public static Map<Integer,Mess>mp=new HashMap<Integer,Mess>();
    	private static int count=0;
    	public static void add(Mess mb) {
    		count++;
    		record.add(mb);
    		mb.setNumber(count);
    		mp.put(count, mb);
    	}
    }