一天的时间，终于搞定了这一实例，不用多说，以下为开发实例基本步骤：
1.建表guestbook(id,name,email,url,title,content,time)
2.新建web项目guestbook
3.为项目添加MySQL连接驱动
4.为项目添加fckeditor,放到WebRoot目录下
5.为项目添加js配置文件，也放置倒WebRoot目录下（一直都听说有必要学一学js，此处直接引用，深感其强大便捷）
var oFCKeditor = new FCKeditor("content");
oFCKeditor.BasePath = '/guestbook/fckeditor/' ;
oFCKeditor.Height = 300 ;
oFCKeditor.ToolbarSet = 'Basic';
oFCKeditor.Create() ;
</script>
6.创建项目所需要的html页面addMessage.htm
7.创建一个工具类StringUtil(web开发中会经常用到)
//验证输入字符串是否为空
public static boolean validateNull(String args){
if(args==null||args.length()==0){
return true;
}
else{
return false;
}
}
String changeNull(String source,String target){
if(source==null||target==null){
return target;
}
else{
return source;
}
}
//过滤Html代码
public static String filterHtml(String input) {
if(input==null){
return null;
}
if(input.length()==0){
return input;
}
input=input.replaceAll("&", "&"); //实现转译
input=input.replaceAll("<", "<");
input=input.replaceAll(">", ">");
input=input.replaceAll(" ", " ");
input=input.replaceAll("'", "'");
input=input.replaceAll("\"", """);
input=input.replaceAll("\n", "<br>");
return input;
}
}
8.创建添加留言的servlet和读取留言的servlet
AddMessageServlet.java(代码)
private static final long serialVersionUID = -8349454122547148005L;
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/work";
String username = "root";
String password = "";
String sql = "insert into guestbook (name,email,phone,title,content,time) values(?,?,?,?,?,?)";
int result = 0;
Connection conn = null;
request.setCharacterEncoding("utf-8");
String name = request.getParameter("name");
String title = request.getParameter("title");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>guestbook input page</title></head>");
out.println("<body>");
if (StringUtil.validateNull(name)) {
out.println("对不起，姓名不能为空，请您重新输入！<br>");
out.println("<a href='/guestbook/addMessage.htm'>添加新的留言</a><br>");
} else if (StringUtil.validateNull(title)) {
out.println("对不起，主题不能为空，请您重新输入！<br>");
out.println("<a href='/guestbook/addMessage.htm'>添加新的留言</a><br>");
} else {
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url, username, password);
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, StringUtil.filterHtml(name));
pstmt.setString(2, StringUtil.filterHtml(request.getParameter("email")));
pstmt.setString(3, StringUtil.filterHtml(request.getParameter("phone")));
pstmt.setString(4, StringUtil.filterHtml(title));
pstmt.setString(5, request.getParameter("content"));
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
pstmt.setString(6, sdf.format(new java.util.Date()));
result = pstmt.executeUpdate();
pstmt.close();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (result == 0) {
out.println("对不起，添加留言不成功，请您重新输入！<br>");
out.println("<a href='/guestbook/addMessage.htm'>添加新的留言</a><br>");
} else {
out.println("祝贺您，成功添加留言。<br>");
out.println("<a href='/guestbook/servlet/getMessage'>查看所有留言内容</a><br>");
}
out.println("</body>");
out.println("</html>");
out.flush();
out.close();
}
}
}
GetMessageServlet.java(代码)
private static final long serialVersionUID = 8694828946703476237L;
StringUtil c=new StringUtil();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/work";
String username = "root";
String password = "";
String sql = "select * from guestbook order by id desc";
Connection conn = null;
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>display messages</title></head>");
out.println("<body>");
out.println("<a href='/guestbook/addMessage.htm'>添加新的留言内容</a><br>");
out.println("留言内容<br><br>");
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url, username, password);
PreparedStatement pstmt = conn.prepareStatement(sql);
ResultSet rs = pstmt.executeQuery();
while (rs.next()) {
this.printRow(out, rs);
}
rs.close();
pstmt.close();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
out.println("</body>");
out.println("</html>");
out.flush();
out.close();
}
private void printRow(PrintWriter out, ResultSet rs) throws SQLException {
out
.println("<table width=\"600\" border=\"1\" style=\"table-layout:fixed;word-break:break-all\">");
out.println("<tr><td width=\"50\">编号</td>");
out.println("<td width=\"550\">" + rs.getInt("id") + "</td></tr>");
out
.println("<tr><td>姓名</td><td>" + rs.getString("name")
+ "</td></tr>");
out.println("<tr><td>电话</td><td>"
+ c.changeNull((String)(rs.getString("phone")), "没填")
+ "</td></tr>");
out.println("<tr><td>email</td><td>"
+ c.changeNull(rs.getString("email"), "没填")
+ "</td></tr>");
out.println("<tr><td valign=\"top\">主题</td><td>"
+ rs.getString("title") + " </td></tr>");
out.println("<tr><td valign=\"top\">内容</td>");
out.println("<td>"
+ c.changeNull(rs.getString("content"), "没填")
+ "</td></tr>");
out.println("<tr><td>时间</td><td>" + rs.getString("time")
+ " </td></tr>");
out.println("</table><br>");
}
}
9.调试运行程序