编译器未报错,command,description列内容全是问号
这是servlet:
package servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.valves.JDBCAccessLogValve;
import dblink.DBHelper;
import beans.Message;
/**
*
* 列表页面初始化控制
*
*/
@SuppressWarnings("serial")
public class ListServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
new DBHelper();
Connection conn=DBHelper.getConnection();
String sql="select ID,COMMAND,DESCRIPTION,CONTENT from message";
PreparedStatement statement=conn.prepareStatement(sql);
ResultSet rs=statement.executeQuery();
List<Message> messagelist=new ArrayList<Message>();
while(rs.next()){
Message message=new Message();
message.setId(rs.getString("ID"));
message.setCommand(rs.getString("COMMAND"));
message.setDescription(rs.getString("DESCRIPTION"));
message.setContent(rs.getString("CONTENT"));
messagelist.add(message);
}
req.setAttribute("messagelist",messagelist);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
req.getRequestDispatcher("/WEB-INF/jsp/back/list.jsp").forward(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
this.doGet(req, resp);
}
}
这是list.jsp:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible"content="IE=9; IE=8; IE=7; IE=EDGE" />
<title>内容列表页面</title>
<link href="<%= basePath %>resources/css/all.css" rel="stylesheet" type="text/css" />
</head>
<body style="background: #e1e9eb;">
<form action="" id="mainForm" method="post">
<div class="right">
<div class="current">当前位置：<a href="javascript:void(0)" style="color:#6E6E6E;">内容管理</a> > 内容列表</div>
<div class="rightCont">
<p class="g_title fix">内容列表 <a class="btn03" href="#">新 增</a> <a class="btn03" href="#">删 除</a></p>
<table class="tab1">
<tbody>
<tr>
<td width="90" align="right">演示字段1：</td>
<td>
<input type="text" class="allInput" value=""/>
</td>
<td width="90" align="right">演示字段2：</td>
<td>
<input type="text" class="allInput" value=""/>
</td>
<td width="85" align="right"><input type="submit" class="tabSub" value="查 询" /></td>
</tr>
</tbody>
</table>
<div class="zixun fix">
<table class="tab2" width="100%">
<tbody>
<tr>
<th><input type="checkbox" id="all" onclick=""/></th>
<th>序号</th>
<th>指令名称</th>
<th>描述</th>
<th>操作</th>
</tr>
<c:forEach items="${messagelist}" var="message" varStatus="status">
<tr <c:if test="${status.index%2 != 0 }">style="background-color:#ECF6EE;"</c:if>>
<td><input type="checkbox" /></td>
<td>${status.index+1 }</td>
<td>${message.command}</td>
<td>${message.description}</td>
<td>
<a href="#">修改</a>
<a href="#">删除</a>
</td>
</tr>
</c:forEach>
</tbody>
</table>
<div class='page fix'>
共 <b>4</b> 条
<a href='###' class='first'>首页</a>
<a href='###' class='pre'>上一页</a>
当前第<span>1/1</span>页
<a href='###' class='next'>下一页</a>
<a href='###' class='last'>末页</a>
跳至 <input type='text' value='1' class='allInput w28' /> 页
<a href='###' class='go'>GO</a>
</div>
</div>
</div>
</div>
</form>
</body>
</html>
这是数据库连接工具类:
package dblink;
import java.sql.Connection;
import java.sql.DriverManager;
public class DBHelper {
private static final String DRIVER = "com.mysql.jdbc.Driver";
private static final String URL="jdbc:mysql://localhost:3306/we_chart?useUnicode=true&characterEncoding=UTF-8";
private static final String USERNAME="root";
private static final String PASSWORD="490321";//
private static Connection conn=null;
//获得驱动
static
{
try
{
Class.forName(DRIVER);
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
public static Connection getConnection() throws Exception
{
if(conn==null)
{
conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
return conn;
}
return conn;
}
}
