Question

我正在使用tomcat 6.0 这是我的卡塔利娜家 - ＆gt; C：\ Program Files \ Apache Software Foundation \ Tomcat 6.0

我正在使用jdk 1.6 这是我的JAVA_HOME C：\ Program Files \ Java \ jdk1.6.0_24

我正在使用Windows 7

好的我写了一个jsp页面这是代码它保存在 - ＆gt; C：\ Program Files \ Apache Software Foundation \ Tomcat 6.0 \ webapps \ myapp \ wow.jsp

<%@ page import="java.sql.*" %>
<%
   String connectionURL = "jdbc:mysql://localhost:3306/unni";
   Connection connection = null;
   Statement statement = null;
   ResultSet rs = null;
   %>



    <%
    Class.forName("com.mysql.Driver").newInstance();
    connection = DriverManager.getConnection(connectionURL, "root", "footyfreak");
    statement = connection.createStatement();
    rs = statement.executeQuery("SELECT * FROM unni");

    while (rs.next()) {
       out.println(rs.getString("player")+"");
    }

    rs.close();
    %>

我下载了连接器并将其复制到： - C：\ Program Files \ Apache Software Foundation \ Tomcat 6.0 \ webapps \ myapp \ WEB-INF \ lib \ mysql-connector-java-5.1.15-bin.jar

也是 C：\ Program Files \ Apache Software Foundation \ Tomcat 6.0 \ lib \ mysql-connector-java-5.1.15-bin.jar

然后当我点击url http://localhost:8080/myapp/wow.jsp

我收到错误，因为--------------＆gt;

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: An exception occurred processing JSP page /wow.jsp at line 12

9:    
10: 
11:     <%
12:     Class.forName("com.mysql.Driver").newInstance();
13:     connection = DriverManager.getConnection(connectionURL, "root", "footyfreak");
14:     statement = connection.createStatement();
15:     rs = statement.executeQuery("SELECT * FROM unni");


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:519)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:410)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

javax.servlet.ServletException: java.lang.ClassNotFoundException: com.mysql.Driver
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:865)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:794)
    org.apache.jsp.wow_jsp._jspService(wow_jsp.java:84)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.ClassNotFoundException: com.mysql.Driver
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128)
    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
    java.lang.Class.forName0(Native Method)
    java.lang.Class.forName(Unknown Source)
    org.apache.jsp.wow_jsp._jspService(wow_jsp.java:68)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.32 logs.
Apache Tomcat/6.0.32

我的类路径详细信息是

variable : CLASSPATH
value    : C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\servlet-api.jar ; C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\mysql-connector-java-5.1.15-bin.jar;

帮帮我。我已经坐了好几天了。

我在文档中做了。

除了这里提到的什么之外还有什么需要做的吗？

Answer 1

java.lang.ClassNotFoundException：com.mysql.Driver

班级名称错了。它是com.mysql.jdbc.Driver。

Class.forName("com.mysql.jdbc.Driver");

那个newInstance()电话是多余的。请注意，将所有代码放在JSP文件中是一种不好的做法。该代码通常应该在您在servlet中使用的普通Java类中。另请注意，运行Tomcat时，CLASSPATH环境变量完全被忽略。

另见：

Answer 2

connection = DriverManager.getConnection（connectionURL，“root”，“footyfreak”）; 在此connectionURL语句中，您要提供数据库名称。例： String st="jdbc:mysql://localhost:3306/staff"; Connection con=null; Class.forName("com.mysql.jdbc.Driver").newInstance(); con = DriverManager.getConnection(st,"root","admin" ); 在此示例中，staff是我的数据库名称。在这样给出之后，我没有收到该错误消息。

Answer 3

而不是添加外部jar将jar文件复制到以下位置

WEB-INF/lib

我无法将jsp页面连接到mysql服务器

3 个答案:

另见：