绝对开源，绝对明了的留言板，便于学习的源码
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用JAVA写的留言板原代码
/*
* 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类初始化:"+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: "宋体"; 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=""我的主页/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 + " 条留言 ");
out.println(" 当前第font color=#ff0000"+currentPage+"/font/共 "+totalPage+" 页 ");
if(currentPage1)
out.println(" a href=guestbookServlet?ipage=1首页/a a href=guestbookServlet?ipage="+(currentPage-1)+"上一页/a ");
else
out.println(" 首页 上一页 ");
if(currentPagetotalPage)
out.println(" a href=guestbookServlet?ipage="+(currentPage+1)+"下一页/a a href=guestbookServlet?ipage="+totalPage+"末页/a ");
else
out.println(" 下一页 末页 ");
out.println("/DIV/TD/TR");
out.println("/TABLE");
out.println("BR");
//这里是显示留言内容
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+ " 时 "+ 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 留言时间："+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("还没有留言！");
}
//结束
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(姓名和留言是必须有的!);}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/你申请用户名?user=你的名字password=你的帐号";
try{
if(debug)
conn=DriverManager.getConnection("jdbc:odbc:ODBC源","用户名","密码口令");
else
conn=DriverManager.getConnection(sqlUrl);
}
catch(SQLException es){
System.err.println("和库连接时出错:"+es.getMessage());
}
}
protected void executeInsert(String sqlStr){
try{
Statement stmt=conn.createStatement();
stmt.executeUpdate(sqlStr);
}
catch(SQLException es){
System.err.println("执行插入时:"+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");
}
}
//查寻
protected ResultSet executeQuery(String sqlStr){
rs=null;
try{
Statement stmt=conn.createStatement();
rs=stmt.executeQuery(sqlStr);
}
catch(SQLException ex){
System.err.println("执行查寻出错："+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("执行动态查寻出错");
}
return rs;
}
//得到表记录总数
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;
}
//得到记录总页数
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";
}
}
您好。我重新地帮你写了代码，完全地符合了你的图片中的界面要求、功能要求。代码如下：（解决了问题，记得给我分哦~^_^呵呵……）
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("地说：");
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("留言内容：");
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()+"地说："+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("留言内容：");
}
});
}
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("置顶");
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();
}
}
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