急急急！java簡單留言板

您好。我重新地幫你寫了代碼，完全地符合了你的圖片中的界面要求、功能要求。代碼如下：（解決了問題，記得給我分哦~^_^呵呵……）

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import java.awt.BorderLayout;

import javax.swing.JPanel;

import javax.swing.JFrame;

import java.awt.Rectangle;

import javax.swing.JLabel;

import javax.swing.SwingConstants;

import java.awt.Font;

import javax.swing.JTextArea;

import javax.swing.JScrollBar;

import javax.swing.JScrollPane;

import javax.swing.JComboBox;

import javax.swing.JTextField;

import javax.swing.JButton;

public class Liuyb extends JFrame {

private static final long serialVersionUID = 1L;

private JPanel jContentPane = null;

private JLabel jLabel = null;

private JTextArea jTextArea = null;

private JScrollPane jScrollPane = null;

private JLabel jLabel1 = null;

private JComboBox jComboBox = null;

private JLabel jLabel2 = null;

private JTextField jTextField = null;

private JButton jButton = null;

private JButton jButton1 = null;

private JButton jButton2 = null;

private JButton jButton3 = null;

/**

* This is the default constructor

*/

public Liuyb() {

super();

initialize();

}

/**

* This method initializes this

*

* @return void

*/

private void initialize() {

this.setContentPane(getJContentPane());

this.setTitle("留言板程序");

this.setBounds(new Rectangle(0, 0, 640, 480));

this.setVisible(true);

}

/**

* This method initializes jContentPane

*

* @return javax.swing.JPanel

*/

private JPanel getJContentPane() {

if (jContentPane == null) {

jLabel2 = new JLabel();

jLabel2.setBounds(new Rectangle(214, 407, 45, 24));

jLabel2.setFont(new Font("Dialog", Font.BOLD, 14));

jLabel2.setText("地說：");

jLabel1 = new JLabel();

jLabel1.setBounds(new Rectangle(32, 407, 15, 24));

jLabel1.setFont(new Font("Dialog", Font.BOLD, 14));

jLabel1.setText("你");

jLabel = new JLabel();

jLabel.setBounds(new Rectangle(283, 15, 45, 20));

jLabel.setHorizontalAlignment(SwingConstants.CENTER);

jLabel.setFont(new Font("Dialog", Font.BOLD, 14));

jLabel.setText("留言板");

jContentPane = new JPanel();

jContentPane.setLayout(null);

jContentPane.add(jLabel, null);

jContentPane.add(getJScrollPane(), null);

jContentPane.add(jLabel1, null);

jContentPane.add(getJComboBox(), null);

jContentPane.add(jLabel2, null);

jContentPane.add(getJTextField(), null);

jContentPane.add(getJButton(), null);

jContentPane.add(getJButton1(), null);

jContentPane.add(getJButton2(), null);

jContentPane.add(getJButton3(), null);

}

return jContentPane;

}

/**

* This method initializes jTextArea

*

* @return javax.swing.JTextArea

*/

private JTextArea getJTextArea() {

if (jTextArea == null) {

jTextArea = new JTextArea();

jTextArea.setText("留言內容：");

jTextArea.setEditable(false);

}

return jTextArea;

}

/**

* This method initializes jScrollPane

*

* @return javax.swing.JScrollPane

*/

private JScrollPane getJScrollPane() {

if (jScrollPane == null) {

jScrollPane = new JScrollPane();

jScrollPane.setBounds(new Rectangle(22, 49, 534, 347));

jScrollPane.setViewportView(getJTextArea());

}

return jScrollPane;

}

/**

* This method initializes jComboBox

*

* @return javax.swing.JComboBox

*/

private JComboBox getJComboBox() {

if (jComboBox == null) {

jComboBox = new JComboBox();

jComboBox.setBounds(new Rectangle(54, 407, 149, 24));

String[] mycbox={"微笑","大笑","痛苦"};

jComboBox.addItem(mycbox[0]);

jComboBox.addItem(mycbox[1]);

jComboBox.addItem(mycbox[2]);

}

return jComboBox;

}

/**

* This method initializes jTextField

*

* @return javax.swing.JTextField

*/

private JTextField getJTextField() {

if (jTextField == null) {

jTextField = new JTextField();

jTextField.setBounds(new Rectangle(265, 407, 231, 24));

}

return jTextField;

}

/**

* This method initializes jButton

*

* @return javax.swing.JButton

*/

private JButton getJButton() {

if (jButton == null) {

jButton = new JButton();

jButton.setBounds(new Rectangle(505, 407, 70, 24));

jButton.setText("提交");

jButton.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextArea.setText(jTextArea.getText()+"\r\n"+"你"+jComboBox.getSelectedItem().toString()+"地說："+jTextField.getText());

}

});

}

return jButton;

}

/**

* This method initializes jButton1

*

* @return javax.swing.JButton

*/

private JButton getJButton1() {

if (jButton1 == null) {

jButton1 = new JButton();

jButton1.setBounds(new Rectangle(565, 51, 60, 32));

jButton1.setText("清屏");

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextArea.setText("留言內容：");

}

});

}

return jButton1;

}

/**

* This method initializes jButton2

*

* @return javax.swing.JButton

*/

private JButton getJButton2() {

if (jButton2 == null) {

jButton2 = new JButton();

jButton2.setBounds(new Rectangle(565, 112, 60, 32));

jButton2.setText("置頂");

jButton2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextArea.setCaretPosition(0);

}

});

}

return jButton2;

}

/**

* This method initializes jButton3

*

* @return javax.swing.JButton

*/

private JButton getJButton3() {

if (jButton3 == null) {

jButton3 = new JButton();

jButton3.setBounds(new Rectangle(565, 173, 60, 32));

jButton3.setText("至尾");

jButton3.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextArea.setCaretPosition((int)jTextArea.getText().length());

}

});

}

return jButton3;

}

public static void main(String args[]){

new Liuyb();

}

}

java點名系統源代碼

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.Scanner;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class test {

static String[] arr;

static boolean flag=true;

static ListString a;

static JTextField jtf;

public static void main(String[] args) {

// TODO Auto-generated method stub

JFrame frame=new JFrame();

frame.setLayout(new GridLayout(1,2));

JButton button = new JButton("抽獎");

jtf = new JTextField();

frame.add(jtf);

frame.add(button);

a = new ArrayListString();

arr = new String[]{"張三","李四","王五"};

button.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

int i=0;

fond:

while(true){

String str = arr[(int)(Math.random()*arr.length)];

for(String b:a){

if(b.equals(str)){

if(i=arr.length){

jtf.setText("沒有人了");

break fond;

}

continue fond;

}

i++;

}

a.add(str);

jtf.setText(str);

break;

}

}

});

frame.setSize(500, 500);

frame.setLocation(500, 500);

frame.setVisible(true);

}

}

用Java web 做一個留言板 留言功能實現了，不知道怎么實現回復和刪除留言的功能，知道的高手，請幫幫忙。

先說說回復吧：

假如:

留言表（id , text ）兩個字段

回復表（ id , text parentId ）用來存放留言表id 三個字段

目前有一條留言

1001,'這是一條留言';

那么給這條留言的回復就是

1003 , '這是一條回復', 1001(這就是該留言的ID) 這樣就把留言和回復關聯上了

回復后點保存時，將數據傳入后臺，數據庫做insert操作就行了

刪除一樣的

如果刪除回復，直接傳入回復的ID 即可

如果刪除留言，得先判斷該留言有沒有回復，如果有回復，則先刪除回復，在刪除留言（外鍵約束）

開源里有沒有留言板的源代碼，JAVA的

絕對開源，絕對明了的留言板，便于學習的源碼

用JAVA寫的留言板原代碼

/*

* guestbookServlet.java

*

* */

import javax.servlet.*;

import javax.servlet.http.*;

import java.sql.*;

import java.util.Date;

/**

*

* */

public class guestbookServlet extends HttpServlet {

boolean debug=false;

String sDBDriver;

Connection conn=null;

ResultSet rs=null;

/** Initializes the servlet.

*/

public void init(ServletConfig config) throws ServletException {

super.init(config);

if(debug)

sDBDriver=new String("sun.jdbc.odbc.JdbcOdbcDriver");

else

sDBDriver=new String("org.gjt.mm.mysql.Driver");

try{

Class.forName(sDBDriver);

}

catch(java.lang.ClassNotFoundException e){

System.err.println("Driver類初始化:"+e.getMessage());

}

}

/** Destroys the servlet.

*/

public void destroy() {

}

/** Processes requests for both HTTP codeGET/code and codePOST/code methods.

* @param request servlet request

* @param response servlet response

*/

protected void processRequest(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

response.setContentType("text/html;charset=gb2312");

java.io.PrintWriter out = response.getWriter();

boolean empty=true;

boolean noResult=true;

String sqlStr;

int currentPage=0;

int totalPage=0;

int reccount=0;

ResultSet myrs=null;

String username=request.getParameter("username");

String email=request.getParameter("email");

String ucontent=request.getParameter("ucontent");

String ipage=request.getParameter("ipage");

if(ipage==null||ipage.length()==0)

currentPage=1;

else

currentPage=Integer.parseInt(ipage);

if((username==null||username.length()==0)||(ucontent==null||ucontent.length()==0))empty=true;

else empty=false;

Date myDate=new Date();

//String intime=new String(String.valueOf(myDate.getYear()+1990)+String.valueOf(myDate.getMonth()));

String year=String.valueOf(myDate.getYear()+1900);

String month=String.valueOf(myDate.getMonth()+1);

if(month.length()==1)

month=new String("0"+month);

String days=String.valueOf(myDate.getDate());

if(days.length()==1)

days=new String("0"+days);

String hours=String.valueOf(myDate.getHours());

if(hours.length()==1)

hours=new String("0"+hours);

String minutes=String.valueOf(myDate.getMinutes());

if(minutes.length()==1)

minutes=new String("0"+minutes);

String intime=year+"-"+month+"-"+days+" "+hours+":"+minutes;

if(email==null||email.length()==0)

email=new String("");

if(!empty){

//username=convert(username);

//email=convert(email);

//ucontent=convert(ucontent);

sqlStr="insert into Mintegbook(Mname,Memail,Mcontent,Mtime,Mid) values("+username+","+email+","+ucontent+","+intime+",1)";

getDsnConn();

executeInsert(sqlStr);

}

sqlStr=new String("select Mname,Memail,Mcontent,Mtime from Mintegbook order by Mtime DESC");

getDsnConn();

reccount=getRecordCount("Mintegbook");

if(reccount==0)

noResult=true;

else

noResult=false;

if(!noResult){

int ipageSize=10;

totalPage=getTotalPage("Mintegbook",ipageSize);

if(currentPagetotalPage)

currentPage=totalPage;

int cursor=(currentPage-1)*ipageSize+1;

try{

myrs=executeScrollableQuery(sqlStr);

myrs.absolute(cursor);

}

catch(SQLException e){

noResult=true;

}

}

out.println("HTMLHEADTITLE我的Servlet留言板/TITLE");

out.println("META http-equiv="Content-Type" content="text/html; charset=gb2312"");

out.println("STYLE type="text/css"");

out.println("!--");

out.println(".mytext { font-family: "宋體"; font-size: 12px}");

out.println(" --");

out.println("/STYLE");

out.println("/HEAD");

out.println("BODY bgcolor="#FFFFFF" text="#000000"");

out.println("TABLE width="600" border="0" cellspacing="0" cellpadding="0" align="CENTER" class="mytext"");

out.println("TRTD height="22" | a href=""我的主頁/a | 我的Servlet留言板(A href="mailto:yf188@21cn.com"川石/A制作)/TD/TR");

out.println("TRTD height="1" bgcolor="#999933"/TD/TR");

out.println("/TABLE");

out.println("BR");

out.println("TABLE width="600" border="0" cellspacing="0" cellpadding="0" align="CENTER" class="mytext"");

out.println("TRTD height="8"/TD/TR");

out.println("TRTD height="18" bgcolor="#f7f7f7"DIV align="right"");

out.println("共有 "+reccount + " 條留言 ");

out.println(" 當前第font color=#ff0000"+currentPage+"/font/共 "+totalPage+" 頁 ");

if(currentPage1)

out.println(" a href=guestbookServlet?ipage=1首頁/a a href=guestbookServlet?ipage="+(currentPage-1)+"上一頁/a ");

else

out.println(" 首頁 上一頁 ");

if(currentPagetotalPage)

out.println(" a href=guestbookServlet?ipage="+(currentPage+1)+"下一頁/a a href=guestbookServlet?ipage="+totalPage+"末頁/a ");

else

out.println(" 下一頁 末頁 ");

out.println("/DIV/TD/TR");

out.println("/TABLE");

out.println("BR");

//這里是顯示留言內容

if(!noResult){

String dname;

String demail;

String dcontent;

String dtime;

Date temptime;

try{

do{

dname=new String(myrs.getString("Mname"));

demail=new String(myrs.getString("Memail"));

dcontent=new String(myrs.getString("Mcontent"));

try{

dtime=new String(myrs.getObject("Mtime").toString());

}

catch(java.lang.NullPointerException e){

dtime=new String("2001-04-06 12:30");

}

if(dname==null)

dname=new String("川石");

if(demail==null)

demail=new String("yf188@21cn.com");

if(dcontent==null)

dcontent=new String("test");

if(dtime==null)

dtime=new String("2001-04-06 12:30");

dname=convert(dname);

dcontent=convert(dcontent);

//temptime=myrs.getDate("Mtime");

/*

String tempyear=String.valueOf(temptime.getYear()+1900);

String tempmonth=String.valueOf(temptime.getMonth()+1);

if(tempmonth.length()==1)

tempmonth=new String("0"+tempmonth);

String tempdays=String.valueOf(temptime.getDate());

if(tempdays.length()==1)

tempdays=new String("0"+tempdays);

String tempminute=String.valueOf(temptime.getMinutes());

if(tempminute.length()==1)

tempminute=new String("0"+tempminute);

String temphours=String.valueOf(temptime.getHours());

if(temphours.length()==1)

temphours=new String("0"+temphours);

String dtime=tempyear+" 年 "+ tempmonth +" 月 "+ tempdays +" 日 " + temphours+ " 時 "+ tempminute + " 分 ";

*/

out.println("TABLE width="600" border="0" cellspacing="0" cellpadding="4" align="CENTER" class="mytext"");

out.println("TRTD姓名 A href="mailto:"+demail+"""+dname+"/A 留言時間："+dtime+"/TD/TR");

out.println("TRTD height="10"/TD/TR");

out.println("TRTD height="10""+dcontent+"/TD/TR");

out.println("/TABLE");

out.println("HR width="600" size="1"");

}while(myrs.next());}

catch(SQLException e){

out.println("error found");

}

}

else{

out.println("還沒有留言！");

}

//結束

out.println("FORM name="form1" method="post" action="guestbookServlet"");

out.println("TABLE width="600" border="0" cellspacing="0" cellpadding="4" align="CENTER" class="mytext"");

out.println("TRTD width="80"姓名:/TDTDINPUT type="text" name="username"*/TD/TR");

out.println("TRTDEmail:/TDTDINPUT type="text" name="email"*/TD/TR");

out.println("TRTD留言：/TDTDTEXTAREA name="ucontent" cols="65" rows="4"/TEXTAREA/TD/TR");

out.println("/TABLE");

out.println("TABLE width="400" border="0" cellspacing="0" cellpadding="6" align="CENTER" class="mytext"");

out.println("TRTD height="15" width="200" /TDTD /TD/TR");

out.println("TRTDDIV align="RIGHT"INPUT type="button" name="Button" value=" 提 交 " style="cursor:hand" onclick="javascript:check()"/DIV/TD");

out.println("TDINPUT type="reset" name="Submit2" value=" 重 置 "/TD/TR");

out.println("/TABLE");

out.println("/FORM");

out.println("TABLE width="400" border="0" cellspacing="0" cellpadding="4" align="CENTER" class="mytext"");

out.println("TRTD width="15" /TD/TR");

out.println("TRTDDIV align="LEFT"/DIV/TD/TR");

out.println("TRTD /TD/TR");

out.println("/TABLE");

out.println("/BODY");

out.println("/HTML");

out.println("SCRIPT language="javascript"");

out.println("function check(){");

out.println("if(form1.username.value.length1||form1.ucontent.value.length1)");

out.println("{alert(姓名和留言是必須有的!);}else{form1.submit();}}");

out.println("/SCRIPT");

out.close();

}

/** Handles the HTTP codeGET/code method.

* @param request servlet request

* @param response servlet response

*/

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

processRequest(request, response);

}

/** Handles the HTTP codePOST/code method.

* @param request servlet request

* @param response servlet response

*/

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

processRequest(request, response);

}

protected void getDsnConn(){

String sqlUrl="jdbc:mysql://10.0.0.1/你申請用戶名?user=你的名字password=你的帳號";

try{

if(debug)

conn=DriverManager.getConnection("jdbc:odbc:ODBC源","用戶名","密碼口令");

else

conn=DriverManager.getConnection(sqlUrl);

}

catch(SQLException es){

System.err.println("和庫連接時出錯:"+es.getMessage());

}

}

protected void executeInsert(String sqlStr){

try{

Statement stmt=conn.createStatement();

stmt.executeUpdate(sqlStr);

}

catch(SQLException es){

System.err.println("執行插入時:"+es.getMessage());

}

}

protected void executeUpdate(String sqlStr){

try{

Statement stmt=conn.createStatement();

stmt.executeUpdate(sqlStr);

}

catch(SQLException e){

System.err.println("error in query record");

}

}

//查尋

protected ResultSet executeQuery(String sqlStr){

rs=null;

try{

Statement stmt=conn.createStatement();

rs=stmt.executeQuery(sqlStr);

}

catch(SQLException ex){

System.err.println("執行查尋出錯："+ex.getMessage());

}

return rs;

}

protected ResultSet executeScrollableQuery(String sqlStr){

rs=null;

try{

Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);

rs=stmt.executeQuery(sqlStr);

}

catch(SQLException e){

System.err.println("執行動態查尋出錯");

}

return rs;

}

//得到表記錄總數

protected int getRecordCount(String sTableName){

rs=null;

int CountResult=0;

String sqlStr="select count(*) from "+sTableName;

try{

Statement stmt=conn.createStatement();

rs=stmt.executeQuery(sqlStr);

if(rs.next())

CountResult=rs.getInt(1);

rs=null;

stmt.close();

}

catch(SQLException ex){

System.err.println(ex.getMessage());

}

return CountResult;

}

//得到記錄總頁數

protected int getTotalPage(String sTableName,int iPageSize){

int totalPage;

int totalRecNum=getRecordCount(sTableName);

if(totalRecNum%iPageSize==0)

totalPage=totalRecNum/iPageSize;

else

totalPage=totalRecNum/iPageSize+1;

return totalPage;

}

protected String convert(String InputStr){

String converted=new String();

byte[] bytes;

try{

bytes=InputStr.getBytes("ISO8859-1");

converted=new String(bytes,"GB2312");

}

catch(java.io.UnsupportedEncodingException e){

System.out.print("error");

}

return converted;

}

/** Returns a short description of the servlet.

*/

public String getServletInfo() {

return "Short description";

}

}

求Java的在線學習系統源代碼

Java 程序員必須收藏的資源大全

古董級工具

這些工具伴隨著Java一起出現，在各自輝煌之后還在一直使用。

Apache Ant：基于XML的構建管理工具。

cglib：字節碼生成庫。

GlassFish：應用服務器，由Oracle贊助支持的Java EE參考實現。

Hudson：持續集成服務器，目前仍在活躍開發。

JavaServer Faces：Mojarra是JSF標準的一個開源實現，由Oracle開發。

JavaServer Pages：支持自定義標簽庫的網站通用模板庫。

Liquibase：與具體數據庫獨立的追蹤、管理和應用數據庫Scheme變化的工具。

2.構建工具

構建及應用依賴關系處理工具。

Apache Maven：Maven是一款聲明式構建及依賴管理工具，采用約定優于配置方式進行管理。相對Apache Ant更推薦使用Maven，前者采用了過程式管理，維護相對困難。

Bazel：來自Google的構建工具，可以快速、可靠地構建代碼。

Gradle：使用Groovy（非XML）進行增量構建，可以很好地與Maven依賴管理配合工作。

需要這些學習資料和工具的可以自己下載哦

用my Eclipse Java、SQL server、 Apache Tomcat制作留言板的全過程！！高手進 急！！謝了

先去數據庫里邊建表，建好以后就不要做任何改動了，因為底層數據庫改來改去的話，會給項目開發帶來意想不到的麻煩，接下來就開始根據頁面上提交的請求將提交到服務器端的表單信息進行保存到數據庫中的工作，然后你可以返回留言頁面首頁將留言按照一頁一頁來顯示，當然你也可以不做分頁顯示，因為不做分頁的話，會更容易一點，這不是什么快捷鍵不快捷鍵的事，流程不是很復雜

當前標題：java留言板系統源代碼,javaweb留言板代碼
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