编写一个简易的留言薄，实现添加留言和显示留言内容的功能

<%@ page language="java" contentType="text/html; charset=UTF-8"
    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>
<form action="lyxianshi.jsp" method="post">
&nbsp;&nbsp;ID:&nbsp;&nbsp;<input type="text" name="name">
<br>
回复:<textarea name="testarea" ></textarea>
<br>
<input type="submit" value="提交">
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="java.sql.*"%>

<!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>
<% 
          String name=new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8"); 
          String testarea=new String(request.getParameter("testarea").getBytes("ISO-8859-1"),"UTF-8");
          Connection conn = null;
          try
          {
              Class.forName("oracle.jdbc.driver.OracleDriver");
              String strUrl = "jdbc:oracle:thin:@localhost:1521:orcl"    ;
              conn  = DriverManager.getConnection(strUrl, "test", "5211314");
              System.out.println("连接数据库成功！");
              
              Statement st = conn.createStatement(); 
              st.executeUpdate("insert into liuyan values( ly.nextval,'"+name+"','"+testarea+"')");
              
              ResultSet rs= st.executeQuery("select * from liuyan order by ly");
              while(rs.next())
            {
               
               String id= rs.getString(2);
               String liuyan= rs.getString(3);
             %>             
               <table width="100%" border="1">
               <tr height="20" ><td>id:<%=id %></td></tr>
               <tr height="40" ><td>留言:<%=liuyan %></td></tr>
               </table>
               <%--out.print("<br>id:"+ id + "  留言:"+liuyan );--%>
              <%
            }
              rs.close();
              st.close();
              conn.close();
              
          } 
          catch (Exception e)
          {
              // TODO 自动生成的 catch 块
              e.printStackTrace();
          }

%> 

</body>
</html>

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原文地址：https://www.cnblogs.com/ljxe/p/5619163.html