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分享请帮忙看一下一下代码为什么提示以下错误Unable to compile class for JSP
<%@ page language="java" contentType="text/html; charset=GB2312"%>
<%@ page import="java.sql.*,java.io.*" %>
<!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=ISO-8859-1">
<title>pages</title>
</head>
<body>
<%
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
int totalcount = 0;
int totalpages = 0;
try{
//A.注册驱动
Driver driver = new com.mysql.jdbc.Driver();//此处报错，An error occurred at line: 19 in the jsp file: /page.jsp
com.mysql.jdbc.Driver cannot be resolved to a type
DriverManager.registerDriver(driver);
//B.获取数据库连接
String url ="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=GB2312&useSSL=false";
String user = "root";
String password = "123";
conn = DriverManager.getConnection(url, user, password);
//C.获取数据库操作对象
stmt = conn.createStatement();
/*
实现SQL结果集分页功能
*/
//D.执行SQL语句
//1.获得总的记录数TotalCount
String sql = "select * from student ";
rs = stmt.executeQuery(sql);
while(rs.next()){
totalcount = rs.getInt("id");
}
System.out.println(totalcount);
}catch(Exception e){
e.printStackTrace();
}finally{
if(rs != null){
try{
rs.close();
}catch(Exception e){
e.printStackTrace();
}
}
if(stmt != null){
try{
stmt.close();
}catch(Exception e){
e.printStackTrace();
}
}
if(conn != null){
try{
conn.close();
}catch(Exception e){
e.printStackTrace();
}
}
}
%>
</body>
</html>
<%@ page import="java.sql.*,java.io.*" %>
<!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=ISO-8859-1">
<title>pages</title>
</head>
<body>
<%
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
int totalcount = 0;
int totalpages = 0;
try{
//A.注册驱动
Driver driver = new com.mysql.jdbc.Driver();//此处报错，An error occurred at line: 19 in the jsp file: /page.jsp
com.mysql.jdbc.Driver cannot be resolved to a type
DriverManager.registerDriver(driver);
//B.获取数据库连接
String url ="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=GB2312&useSSL=false";
String user = "root";
String password = "123";
conn = DriverManager.getConnection(url, user, password);
//C.获取数据库操作对象
stmt = conn.createStatement();
/*
实现SQL结果集分页功能
*/
//D.执行SQL语句
//1.获得总的记录数TotalCount
String sql = "select * from student ";
rs = stmt.executeQuery(sql);
while(rs.next()){
totalcount = rs.getInt("id");
}
System.out.println(totalcount);
}catch(Exception e){
e.printStackTrace();
}finally{
if(rs != null){
try{
rs.close();
}catch(Exception e){
e.printStackTrace();
}
}
if(stmt != null){
try{
stmt.close();
}catch(Exception e){
e.printStackTrace();
}
}
if(conn != null){
try{
conn.close();
}catch(Exception e){
e.printStackTrace();
}
}
}
%>
</body>
</html>
...全文
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xwn_2016 2017-11-07
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limit后边不支持表达式吧
半城煙沙 2017-11-07
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tomcat，jdk jar包没引用到。
qq_40545642 2017-11-06
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<%@ page language="java" contentType="text/html; charset=GB2312"%>
<%@ page import="java.sql.*,java.io.*" %>
<!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=ISO-8859-1">
<title>pages</title>
</head>
<body>
<%
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
int totalcount = 0;
int totalpages = 0;
int currentpage = 1;
try{
//A.注册驱动
Driver driver = new com.mysql.jdbc.Driver();
DriverManager.registerDriver(driver);
//B.获取数据库连接
String url ="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=GB2312&useSSL=false";
String user = "root";
String password = "280613";
conn = DriverManager.getConnection(url, user, password);
//C.获取数据库操作对象
stmt = conn.createStatement();
%>
<%--实现SQL结果集分页功能,一页显示3个数据 --%>
<%
//1.获得总的记录数TotalCount
String sql = "select * from student ";
rs = stmt.executeQuery(sql);
while(rs.next()){
totalcount = rs.getInt("id");
}
totalpages =(totalcount%3 == 0)?(totalcount/3):(totalcount/3+1);
System.out.println(totalpages);
%>
<%
String s = "select id,name,score,age,password from student limit (currentpage-1)*3,3"; //再帮我看一下这个地方为什么会报错
rs = stmt.executeQuery(s);
%>
<%-- 显示页码签 --%>
页码：
<%
for(int i=1;i<=totalpages;i++){
if(i == currentpage){
%>
<%=i%>
<%
}else{
%>
<a href="page.jsp?currentpage=<%=i%>"><%=i %></a>
<%
}
}
%>
<%-- 显示当前页面的记录 --%>
<table border="1" width=300>
<tr>
<td>工号</td>
<td>姓名</td>
<td>学科成绩</td>
<td>年龄</td>
<td>登陆密码</td>
</tr>
<%
while(rs.next()){
int id = rs.getInt("id");
String num = rs.getString("num");
String name = rs.getString("name");
Double score = rs.getDouble("score");
int age = rs.getInt("age");
String passwords = rs.getString("password");
%>
<tr>
<td><%=id %></td>
<td><%=name %></td>
<td><%=score %></td>
<td><%=age %></td>
<td><%=passwords %></td>
</tr>
<%
}
%>
</table>
<%
}catch(Exception e){
e.printStackTrace();
}finally{
if(rs != null){
try{
rs.close();
}catch(Exception e){
e.printStackTrace();
}
}
if(stmt != null){
try{
stmt.close();
}catch(Exception e){
e.printStackTrace();
}
}
if(conn != null){
try{
conn.close();
}catch(Exception e){
e.printStackTrace();
}
}
}
%>
</body>
</html>
uMonster 2017-11-06
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未在WEB-INF的lib目录下添加相应的JDBC的jar包，然后导入项目中。其次在stmt.close();后面加stmt = null; 这样写更好更规范一点！
qq_40545642 2017-11-06
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未在web-inf的lib目录下添加jar包
