JSP语言做简易留言板

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Sessoion
		ServletContext 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>

JSP语言做简易留言板

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