• 简单的bbs发布

    通过登录不同的账号，管理员发布，会员查看。

    首先写好登录页面：

    1. <%@ page language="java" contentType="text/html; charset=UTF-8"
    2. 	pageEncoding="UTF-8"%>
    3. html>
    4. <html>
    5. <head>
    6. <meta charset="UTF-8">
    7. <title>Insert title heretitle>
    8. head>
    9. <style>
    10. * {
    11. 	margin: 0px;
    12. 	padding: 0px;
    13. }
    14. style>
    15. <body>
    16. 	<form action="login" method="POST">
    17. 		<table>
    18. 			<tr>
    19. 				<td>用户名td>
    20. 				<td><input type="text" name="account">td>
    21. 			tr>
    22. 			<tr>
    23. 				<td>密码td>
    24. 				<td><input type="text" name="password">td>
    25. 			tr>
    26. 			<tr>
    27. 				<td colspan="2" align="center"><input type="submit" value="登录">
    28. 					<input type="reset">td>
    29. 			tr>
    30. 			<tr>
    31. 	            
    32. 				<td colspan="2" align="center">
    33. 					<p style="color: red;">${msg }p>
    34. 				td>
    35. 			tr>
    36. 		table>
    37. 	form>
    38. body>
    39. html>

    简单的表单提交到后台处理，提示语句使用el表达式响应

    登录页面如下：

     

     分别创建实体类：

    用户类：

    1. package com.bbs.pojo;
    2.  
    3. public class User {
    4. 	private String account;
    5. 	private String password;
    6. 	private String type;// 0为普通用户 1为管理员
    7. 	public String getAccount() {
    8. 		return account;
    9. 	}
    10. 	public void setAccount(String account) {
    11. 		this.account = account;
    12. 	}
    13. 	public String getPassword() {
    14. 		return password;
    15. 	}
    16. 	public void setPassword(String password) {
    17. 		this.password = password;
    18. 	}
    19. 	public String getType() {
    20. 		return type;
    21. 	}
    22. 	public void setType(String type) {
    23. 		this.type = type;
    24. 	}
    25.  
    26. }

     用于登陆操作

    信息类：

    1. package com.bbs.pojo;
    2.  
    3. public class Title {
    4. 	private int on;
    5. 	private String title;
    6.  
    7. 	public int getOn() {
    8. 		return on;
    9. 	}
    10.  
    11. 	public void setOn(int on) {
    12. 		this.on = on;
    13. 	}
    14.  
    15. 	public String getTitle() {
    16. 		return title;
    17. 	}
    18.  
    19. 	public void setTitle(String title) {
    20. 		this.title = title;
    21. 	}
    22.  
    23. }

    用于添加和查看信息。 

    在登录的servlet中，将会使用密码的验证，我将它写在的数据库操作Dao包下，

    loginDao：

    1. package com.bbs.Dao;
    2.  
    3. import com.bbs.pojo.User;
    4.  
    5. public class UserDao {
    6. 	public User login(String account, String password) {
    7. 		// 模拟两个账号，管理员
    8. 		if (account.equals("gly") && password.equals("123456")) {
    9. 			User user = new User();
    10. 			user.setAccount(account);
    11. 			user.setPassword(password);
    12. 			user.setType("1");
    13. 			return user;
    14. 			// 会员
    15. 		} else if (account.equals("pt") && password.equals("321654")) {
    16. 			User user = new User();
    17. 			user.setAccount(account);
    18. 			user.setPassword(password);
    19. 			user.setType("0");
    20. 			return user;
    21. 		}
    22. 		return null;
    23. 	}
    24.  
    25. }

     处理登录的servlet：

    1. package com.bbs.Servlet;
    2.  
    3. import java.io.IOException;
    4.  
    5. import com.bbs.Dao.UserDao;
    6. import com.bbs.pojo.User;
    7.  
    8. import jakarta.servlet.ServletException;
    9. import jakarta.servlet.annotation.WebServlet;
    10. import jakarta.servlet.http.HttpServlet;
    11. import jakarta.servlet.http.HttpServletRequest;
    12. import jakarta.servlet.http.HttpServletResponse;
    13. import jakarta.servlet.http.HttpSession;
    14. import jakarta.websocket.Session;
    15.  
    16. /**
    17.  * Servlet implementation class login
    18.  */
    19. public class login extends HttpServlet {
    20. 	private static final long serialVersionUID = 1L;
    21.  
    22. 	/**
    23. 	 * Default constructor.
    24. 	 */
    25. 	public login() {
    26. 		// TODO Auto-generated constructor stub
    27. 	}
    28.  
    29. 	/**
    30. 	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
    31. 	 *      response)
    32. 	 */
    33. 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
    34. 			throws ServletException, IOException {
    35. 		doPost(request, response);
    36. 	}
    37.  
    38. 	/**
    39. 	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
    40. 	 *      response)
    41. 	 */
    42. 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
    43. 			throws ServletException, IOException {
    44. 		request.setCharacterEncoding("utf-8");
    45. 		String account = request.getParameter("account");
    46. 		String password = request.getParameter("password");
    47. 		User user = new User();
    48. 		user = new UserDao().login(account, password);
    49. 		if (user != null) {
    50. 			HttpSession session = request.getSession();
    51. 			session.setAttribute("user", user);
    52. 			response.sendRedirect("index.jsp");
    53. 		} else {
    54. 			request.setAttribute("msg", "用户或密码错误");
    55. 			request.getRequestDispatcher("login.jsp").forward(request, response);
    56. 		}
    57. 	}
    58.  
    59. }

    使用转发的方式跳转页面，可以将提示语句传回前端。

     登陆成功后的页面如下：

     

     

    完成发布和查看界面：

     

    1. <%@ page language="java" contentType="text/html; charset=UTF-8"
    2. 	pageEncoding="UTF-8"%>
    3. <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
    4. html>
    5. <html>
    6. <head>
    7. <meta charset="UTF-8">
    8. <title>Insert title heretitle>
    9. head>
    10. <body>
    11. 	<c:if test="${user.type==1}">
    12. 		<h3>
    13. 			欢迎登录，管理员:<b>${user.account}b>
    14. 		h3>
    15. 		<form action="titleServlet" method="post">
    16. 			<table>
    17. 				<tr>
    18. 					<td>标题td>
    19. 					<td><input type="text" name="title">td>
    20. 				tr>
    21. 				<tr>
    22. 					<td colspan="2" align="center"><input type="submit" value="提交">
    23. 						<input type="reset">td>
    24. 				tr>
    25. 				<tr colspan="2" align="center">
    26. 					<td style="color: red;">${msg}td>
    27. 				tr>
    28. 			table>
    29. 		form>
    30. 		<a href="showTitle.jsp">查看标题a>
    31. 	c:if>
    32. 	<c:if test="${user.type==0 }">
    33. 		<h3>
    34. 			欢迎登录，会员:<b>${user.account}b>
    35. 		h3>
    36. 		<br>
    37. 		<a href="showTitle.jsp">查看标题a>
    38. 	c:if>
    39. body>
    40. html>

    通过jetl的if判断会员的管理员，显示不同的页面；

    管理员多一个发布的表单，会员只有查看发布信息。

    将数据添加到数据库，添加数据Dao：

    1. package com.bbs.Dao;
    2.  
    3. import java.util.ArrayList;
    4. import java.util.List;
    5.  
    6. import com.bbs.pojo.Title;
    7.  
    8. public class TitleDao {
    9. 	public static List titleList = <span class="hljs-keyword">new</span> <span class="hljs-title class_">ArrayList</span><Title>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">addTitle</span><span class="hljs-params">(String title)</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		<span class="hljs-type">Title</span> <span class="hljs-variable">t</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Title</span>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		t.setTitle(title);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="14"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		<span class="hljs-keyword">if</span> (titleList.size() > <span class="hljs-number">0</span>) {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="15"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			<span class="hljs-type">int</span> <span class="hljs-variable">id</span> <span class="hljs-operator">=</span> titleList.get(titleList.size() - <span class="hljs-number">1</span>).getOn();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="16"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			id++;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="17"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			t.setOn(id);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="18"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		} <span class="hljs-keyword">else</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="19"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			t.setOn(<span class="hljs-number">1</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="20"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		}</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="21"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		titleList.add(t);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="22"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	}</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="23"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="24"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">}</div></div></li></ol></code><div class="hide-preCode-box"><span class="hide-preCode-bt" data-report-view="{"spm":"1001.2101.3001.7365"}"><img class="look-more-preCode contentImg-no-view" src="https://1000bd.com/contentImg/2022/06/27/191644837.png" alt="" title=""></span></div><div class="hljs-button signin" data-title="登录后复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> 
<blockquote> 
 <p>让编号实现自动增长，取出最后一个，累加，集合中没有数据就默认加入1；</p> 
</blockquote> 
<p>实现发布servlet：</p> 
<p> </p> 
<pre data-index="7" class="set-code-hide" name="code"><code class="language-java hljs"><ol class="hljs-ln" style="width:738px"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">package</span> com.bbs.Servlet;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">import</span> java.io.IOException;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">import</span> com.bbs.Dao.TitleDao;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">import</span> jakarta.servlet.ServletException;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">import</span> jakarta.servlet.annotation.WebServlet;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">import</span> jakarta.servlet.http.HttpServlet;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">import</span> jakarta.servlet.http.HttpServletRequest;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">import</span> jakarta.servlet.http.HttpServletResponse;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment"><span class="hljs-comment">/**</span></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="14"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment"> * Servlet implementation class titleServlet</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="15"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment"> */</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="16"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-meta">@WebServlet("/titleServlet")</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="17"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">titleServlet</span> <span class="hljs-keyword">extends</span> <span class="hljs-title class_">HttpServlet</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="18"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> <span class="hljs-type">long</span> <span class="hljs-variable">serialVersionUID</span> <span class="hljs-operator">=</span> <span class="hljs-number">1L</span>;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="19"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="20"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-comment"><span class="hljs-comment">/**</span></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="21"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">	 * Default constructor.</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="22"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">	 */</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="23"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-keyword">public</span> <span class="hljs-title function_">titleServlet</span><span class="hljs-params">()</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="24"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		<span class="hljs-comment">// TODO Auto-generated constructor stub</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="25"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	}</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="26"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="27"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-comment"><span class="hljs-comment">/**</span></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="28"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">	 * <span class="hljs-doctag">@see</span> HttpServlet#doGet(HttpServletRequest request, HttpServletResponse</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="29"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">	 *      response)</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="30"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">	 */</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="31"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">doGet</span><span class="hljs-params">(HttpServletRequest request, HttpServletResponse response)</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="32"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			<span class="hljs-keyword">throws</span> ServletException, IOException {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="33"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		doPost(request, response);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="34"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	}</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="35"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="36"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-comment"><span class="hljs-comment">/**</span></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="37"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">	 * <span class="hljs-doctag">@see</span> HttpServlet#doPost(HttpServletRequest request, HttpServletResponse</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="38"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">	 *      response)</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="39"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">	 */</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="40"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">doPost</span><span class="hljs-params">(HttpServletRequest request, HttpServletResponse response)</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="41"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			<span class="hljs-keyword">throws</span> ServletException, IOException {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="42"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		request.setCharacterEncoding(<span class="hljs-string">"utf-8"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="43"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		<span class="hljs-type">String</span> <span class="hljs-variable">title</span> <span class="hljs-operator">=</span> request.getParameter(<span class="hljs-string">"title"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="44"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		<span class="hljs-type">TitleDao</span> <span class="hljs-variable">tdao</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">TitleDao</span>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="45"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		tdao.addTitle(title);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="46"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		request.setAttribute(<span class="hljs-string">"msg"</span>, <span class="hljs-string">"发帖成功"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="47"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		request.getRequestDispatcher(<span class="hljs-string">"index.jsp"</span>).forward(request, response);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="48"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	}</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="49"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="50"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">}</div></div></li></ol></code><div class="hide-preCode-box"><span class="hide-preCode-bt" data-report-view="{"spm":"1001.2101.3001.7365"}"><img class="look-more-preCode contentImg-no-view" src="https://1000bd.com/contentImg/2022/06/27/191644837.png" alt="" title=""></span></div><div class="hljs-button signin" data-title="登录后复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> 
<blockquote> 
 <p>调用操作数据库Dao方法，返回数据。</p> 
</blockquote> 
<p>查看信息页面：</p> 
<pre data-index="8" class="set-code-hide" name="code"><code class="language-html hljs language-xml"><ol class="hljs-ln" style="width:100%"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><%@page import="com.bbs.Dao.TitleDao"%></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><%@page import="com.bbs.pojo.Title"%></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><%@page import="java.util.List"%></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><%@ page language="java" contentType="text/html; charset=UTF-8"</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	pageEncoding="UTF-8"%></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-meta"><!DOCTYPE <span class="hljs-keyword">html</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-tag"><<span class="hljs-name">html</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-tag"><<span class="hljs-name">head</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-tag"><<span class="hljs-name">meta</span> <span class="hljs-attr">charset</span>=<span class="hljs-string">"UTF-8"</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-tag"><<span class="hljs-name">title</span>></span>Insert title here<span class="hljs-tag"></<span class="hljs-name">title</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-tag"></<span class="hljs-name">head</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-tag"><<span class="hljs-name">body</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="14"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<%</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="15"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	List<span class="hljs-tag"><<span class="hljs-name">Title</span>></span> list = TitleDao.titleList;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="16"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	pageContext.setAttribute("list", list);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="17"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	%></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="18"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-tag"><<span class="hljs-name">table</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="19"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		<span class="hljs-tag"><<span class="hljs-name">tr</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="20"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			<span class="hljs-tag"><<span class="hljs-name">td</span>></span>编号<span class="hljs-tag"></<span class="hljs-name">td</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="21"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			<span class="hljs-tag"><<span class="hljs-name">td</span>></span>标题<span class="hljs-tag"></<span class="hljs-name">td</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="22"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		<span class="hljs-tag"></<span class="hljs-name">tr</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="23"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		<span class="hljs-tag"><<span class="hljs-name">c:forEach</span> <span class="hljs-attr">items</span>=<span class="hljs-string">"${list}"</span> <span class="hljs-attr">var</span>=<span class="hljs-string">"i"</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="24"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			<span class="hljs-tag"><<span class="hljs-name">tr</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="25"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">				<span class="hljs-tag"><<span class="hljs-name">td</span>></span>${i.on }<span class="hljs-tag"></<span class="hljs-name">td</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="26"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">				<span class="hljs-tag"><<span class="hljs-name">td</span>></span>${i.title }<span class="hljs-tag"></<span class="hljs-name">td</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="27"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">			<span class="hljs-tag"></<span class="hljs-name">tr</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="28"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">		<span class="hljs-tag"></<span class="hljs-name">c:forEach</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="29"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-tag"></<span class="hljs-name">table</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="30"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-tag"></<span class="hljs-name">body</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="31"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-tag"></<span class="hljs-name">html</span>></span></div></div></li></ol></code><div class="hide-preCode-box"><span class="hide-preCode-bt" data-report-view="{"spm":"1001.2101.3001.7365"}"><img class="look-more-preCode contentImg-no-view" src="https://1000bd.com/contentImg/2022/06/27/191644837.png" alt="" title=""></span></div><div class="hljs-button signin" data-title="登录后复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> 
<blockquote> 
 <p> 使用jetl的循环遍历list中的数据。</p> 
</blockquote> 
<p> 以上便是一个简单的发布消息系统，使用的<strong>java+html+servlet+jetl</strong>使用MVC架构，各个包用途分明。 </p>
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