JSP语言做简易留言板

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首先奉上视图：

主界面：

查看留言界面：

看一下我前台后台：

下面开始给大家公布代码并且解释咯：

首先是Index.jsp界面：

<%@ page language="java"  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><%@page contentType="text/html; charset=gb2312" %><form action="WordServlet" method="post">留言者：    <input type="text" name="author"/><br>留言标题：<input type="text" name="title"/><br> 留言内容：<textarea rows="5" cols="30" name="content"></textarea><br><br><input type="submit" value="确定"/><input type="reset" value="重置"/><a href="show.jsp">查看留言</a></form></body></html>

show.jsp代码：

<%@ page language="java"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><%@ page contentType="text/html; charset=gb2312"%><%@ page import="java.util.*"%><%@ page import="xyz.Servlet.valuebean.*"%><%ArrayList wordlist = (ArrayList) application.getAttribute("wordlist");if (wordlist == null || wordlist.size() == 0)out.print("没有留言可显示");else {for (int i = wordlist.size() - 1; i >= 0; i--) {WordSingle single = (WordSingle) wordlist.get(i);%>留言者：<%=single.getAuthor()%><p>留言时间：<%=single.getTime()%><p>留言标题：<%=single.getTitle()%><p>留言内容：<textarea rows="7" cols="30" readonly> <%=single.getConent()%></textarea><a href="index.jsp">我要留言</a><hr width="100%"><%}}%></body></html>

接下来是后台代码：

WordServlet.java页面代码：

package xyz.Servlet;import java.io.IOException;import java.util.ArrayList;import java.util.Date;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import xyz.Servlet.toolbean.MyTools;import xyz.Servlet.valuebean.WordSingle;/** * Servlet implementation class WordServlet */public class WordServlet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//以下代码用来获取表单中字段内容并进行转码String author = MyTools.toChinese(request.getParameter("author"));String title = MyTools.toChinese(request.getParameter("title"));String content = MyTools.toChinese(request.getParameter("content"));//获取当前时间并格式化时间为指定格式String today=MyTools.changeTime(new Date());//创建值JavaBean对象来封装获取的信息WordSingle single= new WordSingle();single.setAuthor(MyTools.changeHTML(author)); //创建JavaBean对象用来封装获取信息single.setTitle(MyTools.changeHTML(title));single.setConent(content);single.setTime(today);HttpSession session = request.getSession(); //获取SessoionServletContext scx = session.getServletContext();//通过Session对象获取应用上下文ArrayList wordlist = (ArrayList) scx.getAttribute("wordlist");//获取存储在应用上下文中的对象if(wordlist==null){ wordlist=new ArrayList();}wordlist.add(single);//将封装了信息的值JavaBean存储到集合对象中scx.setAttribute("wordlist", wordlist);  //将集合对象保存到应用上下文response.sendRedirect("show.jsp");//请求重定向show.jsp界面}}

工具类页代码：

package xyz.Servlet.toolbean;import java.io.UnsupportedEncodingException;import java.text.SimpleDateFormat;import java.util.Date;public class MyTools {/** * @功能：转换字符串中属于HTML语言的特殊字符 * @参数：source为要转换的字符串 * @返回值：String类型值 */public static String changeHTML(String source) {String changeStr = "";changeStr = source.replace("&", "&");// &符号changeStr = source.replace(" ", " ");changeStr = source.replace("<", "<");changeStr = source.replace(">", ">");changeStr = source.replace("\r\n", "<br>");// 回车换行return changeStr;}/** * @功能:日期格式化 * @param date * @return String */public static String changeTime(Date date) {// 创建一个格式化日期SimpleDateFormat对象,并同时指定日期最终被转换的格式SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");return format.format(date); // 调用format方法格式化日期}/** * 功能：解决提交表单产生的中文乱码 *  * @param value为要转换的字符串 * @return String */public static String toChinese(String str) {if (str == null)str = "";try {str = new String(str.getBytes("ISO-8859-1"), "gb2312");} catch (UnsupportedEncodingException e) {str = "";e.printStackTrace();}return str;}}

valuebean类代码：
package xyz.Servlet.toolbean;import java.io.UnsupportedEncodingException;import java.text.SimpleDateFormat;import java.util.Date;public class MyTools {/** * @功能：转换字符串中属于HTML语言的特殊字符 * @参数：source为要转换的字符串 * @返回值：String类型值 */public static String changeHTML(String source) {String changeStr = "";changeStr = source.replace("&", "&");// &符号changeStr = source.replace(" ", " ");changeStr = source.replace("<", "<");changeStr = source.replace(">", ">");changeStr = source.replace("\r\n", "<br>");// 回车换行return changeStr;}/** * @功能:日期格式化 * @param date * @return String */public static String changeTime(Date date) {// 创建一个格式化日期SimpleDateFormat对象,并同时指定日期最终被转换的格式SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");return format.format(date); // 调用format方法格式化日期}/** * 功能：解决提交表单产生的中文乱码 *  * @param value为要转换的字符串 * @return String */public static String toChinese(String str) {if (str == null)str = "";try {str = new String(str.getBytes("ISO-8859-1"), "gb2312");} catch (UnsupportedEncodingException e) {str = "";e.printStackTrace();}return str;}}
web.xml页面代码：
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID" version="3.0"><servlet><servlet-name>myServlet</servlet-name><servlet-class>xyz.Servlet.WordServlet</servlet-class></servlet><servlet-mapping><servlet-name>myServlet</servlet-name><url-pattern>/WordServlet</url-pattern></servlet-mapping></web-app>

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