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JSP连接MYSQL数据库 错误。请大侠们进来看看 侃侃！
摘要: JSP连接MYSQL数据库 错误。请大侠们进来看看 侃侃！
jsp 文件如下：
<%@ page language="java" %>
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*"%>
<%@ page import="java.sql.*,javax.sql.*"%>
<head>
<head>
<body>
<%
//声名
String driver="com.mysql.jdbc.Driver";
String sConnStr ="jdbc:mysql://localhost/mysql";
Class.forName(driver).newInstance();
Connection conn = DriverManager.getConnection(sConnStr,"root","mypass");
Statement stmt = null;
ResultSet rs = null;
String sql="select * from czy";
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
//利用while循环将数据表中的记录列出
while (rs.next())
{
rs.getString("czyID");
rs.getString("name");
rs.getString("pwd");
%>
<%
}
rs.close(); //关闭ResultSet对象
stmt.close(); //关闭Statement对象
conn.close(); //关闭Connection对象
%>
</body>
环境设置如下：
CLASSPATH ：
%JAVA_HOME%/lib/dt.jar;
%JAVA_HOME%/lib/tools.jar;
C:/Java/jdbc/classes12.zip;
C:/Java/jdbc/mysql-connector-java-5.0.3-bin.jar;
E:/Tomcat 5.5/common/lib/mysql-connector-java-5.0.3-bin.jar;
E:/Tomcat 5.5/common/lib/servlet-api.jar;
E:/Tomcat 5.5/common/lib/classes12.zip;
JAVA_HOME：
C:/Java/jdk15
TOMCAT_HOME：
E:/Tomcat 5.5
访问页面错误如下：
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /second.jsp:16
13: String driver="com.mysql.jdbc.Driver";
14: String sConnStr ="jdbc:mysql://localhost/mysql";
15: Class.forName(driver).newInstance();
16: Connection conn = DriverManager.getConnection(sConnStr,"root","mypass");
17: Statement stmt = null;
18: ResultSet rs = null;
19: String sql="select * from czy";
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.ServletException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.SocketException
MESSAGE: java.net.ConnectException: Connection refused: connect
STACKTRACE:
java.net.SocketException: java.net.ConnectException: Connection refused: connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
at com.mysql.jdbc.MysqlIO.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2641)
at com.mysql.jdbc.Connection.
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.apache.jsp.second_jsp._jspService(second_jsp.java:60)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:833)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:639)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1285)
at java.lang.Thread.run(Unknown Source)
** END NESTED EXCEPTION **
Last packet sent to the server was 47 ms ago.
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:858)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
org.apache.jsp.second_jsp._jspService(second_jsp.java:94)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.SocketException
MESSAGE: java.net.ConnectException: Connection refused: connect
STACKTRACE:
java.net.SocketException: java.net.ConnectException: Connection refused: connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
at com.mysql.jdbc.MysqlIO.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2641)
at com.mysql.jdbc.Connection.
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.apache.jsp.second_jsp._jspService(second_jsp.java:60)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:833)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:639)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1285)
at java.lang.Thread.run(Unknown Source)
** END NESTED EXCEPTION **
Last packet sent to the server was 47 ms ago.
com.mysql.jdbc.Connection.createNewIO(Connection.java:2707)
com.mysql.jdbc.Connection.
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
java.sql.DriverManager.getConnection(Unknown Source)
java.sql.DriverManager.getConnection(Unknown Source)
org.apache.jsp.second_jsp._jspService(second_jsp.java:60)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.
--------------------------------------------------------------------------------
Apache Tomcat/5.5.17
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying
MESSAGE: java.net.ConnectException: Connection refused: connect－－－－数据库没开或者端口／密码不正确
数据库是开的啊。 我在mysql 下select *From czy 可以返回数据啊。
rs.getString("czyID");
rs.getString("name");
rs.getString("pwd");
这几句有问题,
你再看一看
fdsfdsaf
fdsafdsa fdsafdsafd
String sConnStr ="jdbc:mysql://localhost:3306/mysql";
这样就OK了
<%=rs.getString("czyID")%>
<%=rs.getString("name")%>
<%=rs.getString("pwd")%>
to deng1234:
rs.getString("czyID");
rs.getString("name");
rs.getString("pwd");
这几句有问题,
你再看一看
这个没有问题啊？ 我不换行有什么关系吗？
是不是url写错了？
连接的URL那里没有写明白端口号
正确的应该是jdbc:mysql://localhost:3306/mysql
3306为mysql默认的连接端口
问题已经解决？重新安装Mysql 。在修改密码窗口有一个是否允许root远程访问。将这个选项勾上就OK了.
up
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