Jsp留言板
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用Jsp + Servlet + JavaBean 做的一个简单的留言板，可以提交留言和查看留言。
注意，Servlet的配置问题。
<servlet>标签表示：这是一个servlet的声明
<display-name>标签表示：该servlet的显示名称，不重要，可以不用配置
<servlet-name>标签表示：该servlet在web容器中的名称,必需配置
<servlet-class>标签表示：该servlet所对应java类的路径,必需配置
<servlet-mapping>标签表示：该servlet在web容器中的映射,必需配置
<servlet-name>标签表示：这个servlet映射所对应的是哪一个servlet，它就是需要填入上面的那个<servlet-name>标签中的值,必需配置
<url-pattern>标签表示：这个servlet在web容器中的请求路径,必需配置
- 追问：
谢谢在麻烦您一下
我有一个页面newTopic.jsp
<form name="form1" action="newtopicservlet" method="post">
然后servlet包里有个NewTopicServlet.java的servlet我要怎么写配置呢？
- 回答：
<servlet>
<servlet-name>NewTopicServlet</servlet-name>
<servlet-class>servlet.NewTopicServlet</servlet-class>
</servlet><servlet-mapping>
<servlet-name>NewTopicServlet</servlet-name>
<url-pattern>/NewTopicServlet</url-pattern>
</servlet-mapping>
下面是一个例子：
<%@ page language="java" contentType="text/html" import="java.util.*" pageEncoding="utf-8"%><html> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>留言板页面</title> </head> <body background="image/abc.jpg"> <form action="AddMessageServlet" method="post"> <h1>留言板</h1> <h3>留 言 者 ：<input type="text" name="author" size="30"></h3> <h3>留言标题 ：<input type="text" name="title" size="30"></h3> <h3>留言内容 ：</h3> <textarea rows="15" cols="100" name="content"></textarea> <p> <h3> <input type="submit" name="submit" value="提交" style="height:30px;width:80px"> <input type="reset" name="reset" value="重置" style="height:30px;width:80px"> <a href="showmessage.jsp">查看留言</a> </h3> </form> </body></html>
<%@page import="bean.MessageBean"%><%@ page language="java" contentType="text/html" import="java.util.*" pageEncoding="utf-8"%><html> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>显示留言内容</title> </head> <body background="image/abc.jpg"> <% ArrayList wordlist = (ArrayList)application.getAttribute("wordlist"); if(wordlist == null || wordlist.size()==0){ out.print("目前还没有留言！"); %> <a href="index.jsp"><h3>我要留言</h3></a> <% } else{ for(int i=wordlist.size()-1;i>=0;i--){ MessageBean mm = (MessageBean)wordlist.get(i); %> <h2> 留言板内容 </h2> <h4> 留 言 者：<%=mm.getAuthor() %></h4> <h4> 留言时间：<%=mm.getTime() %></h4> <h4> 留言标题：<%=mm.getTitle() %></h4> <h4> 留言内容：<p><textarea rows="15" cols="100" readonly><%=mm.getContent() %></textarea></h4> <a href="index.jsp"><h3>我要留言</h3></a> <hr width ="90"> <% } } %> </body></html><?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" 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_2_5.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>AddMessageServlet</servlet-name> <servlet-class>servlet.AddMessageServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>AddMessageServlet</servlet-name> <url-pattern>/AddMessageServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list></web-app>
package servlet;import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import javax.servlet.ServletContext;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 bean.MessageBean;import com.sun.xml.internal.bind.v2.runtime.unmarshaller.XsiNilLoader.Array;import com.sun.xml.internal.messaging.saaj.soap.ver1_1.Message1_1Impl;public class AddMessageServlet extends HttpServlet {/** * Constructor of the object. */public AddMessageServlet() {super();}/** * Destruction of the servlet. <br> */public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}/** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request,response);}/** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String author = new String(request.getParameter("author").getBytes("ISO-8859-1"),"UTF-8");String title = new String(request.getParameter("title").getBytes("ISO-8859-1"),"UTF-8");String content = new String(request.getParameter("content").getBytes("ISO-8859-1"),"UTF-8");//获取当前时间并格式化时间为指定格式SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String today = format.format(new Date());MessageBean mm = new MessageBean();mm.setAuthor(author);mm.setTitle(title);mm.setContent(content);mm.setTime(today);//获取session对象HttpSession session = request.getSession();//通过session对象获取应用上下文ServletContext scx = session.getServletContext();//获取存储在应用上下文中的集合对象ArrayList wordlist = (ArrayList)scx.getAttribute("wordlist");if(wordlist == null)wordlist = new ArrayList();//将封装了信息的JavaBean值存储到集合对象中wordlist.add(mm);//将集合对象保存到应用上下文中scx.setAttribute("wordlist", wordlist);response.sendRedirect("showmessage.jsp");}/** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */public void init() throws ServletException {// Put your code here}}package bean;public class MessageBean {private String author;private String title;private String content;private String time;public MessageBean(){}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}public String getTime() {return time;}public void setTime(String time) {this.time = time;}}
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