jdk,tomcat,sql server2000都已经装好并测试成功.
小弟在另一个测试中却碰到了问题,请各位师兄指教.
%@ page contentType="text/html; charset=gb2312" %>
<%@ page info="database handler"%>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<!--导入结束-->
<html>
<head>
<title>数据库连接实验</title>
</head>
<body>
<%
String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
String sConnStr = "Jdbc:Odbc:try";//“try”的意思就是与刚才设置的数据源名对应;
Connection Con = null;
Statement Stmt = null;
try
{
try /*加载驱动程序*/
{
Class.forName(sDBDriver);
}
catch(java.lang.ClassNotFoundException e)
{
out.print("Connect to Database error: " + e.getMessage());
}
//catch(Exception e){}
try /*建立连接*/
{
Con = DriverManager.getConnection(sConnStr,"sa","sa");
}
catch(SQLException e)
{
out.print(e.toString());
}
//catch(Exception e){} Stmt = Con.createStatement(); /*创建JDBC声明*/
String query="CREATE TABLE GUEST" + /*在数据库中创建新的表*/
"(NUM VARCHAR(32),"+
"USERNAME TEXT,"+
"CONTENT TEXT,"+
"PASSWORD INTEGER,"+
"TOTAL INTEGER,"+
"REALNAME TEXT)";
Stmt.executeUpdate(query); /*更新数据库*/
}
catch (Exception e) {}
out.println("恭喜,表连接创建成功!");
%>
<%
ResultSet RS= Stmt.executeQuery("SELECT * FROM EMPLOYEE WHERE eage<25"); /*连接到数据库中的表EMPLOYEE上*/
String tt; /**号表示选择表中所有的列*/
String link; /*若选择其中的某几列可以将*号换成列标号*/
String makeStr; /*WHERE语句表示条件选择*/
out.print("<table border=2 style=color:blue >");
while (RS.next()) {
out.print("<tr><td>");
tt = RS.getString("ename"); /*查询表中NUM字段的内容,字段内容可能使数组,默认列输出*/
out.print(tt);
out.print("</td><td>");
tt = RS.getString("esex");
out.print(tt);
out.print("</td><td>");
tt = RS.getString("eage");
out.print(tt);
out.print("</td><td>");
tt=RS.getString("egrade");
out.print(tt);
out.print("</td><td>");
}
out.print("</table>");
RS.close();
out.println("数据查询成功!");
%>
<% /*在数据库中添加数据*/
String sql="INSERT INTO EMPLOYEE VALUES ('5','aaa','m',54,'hehe')";
Stmt.executeUpdate(sql);
out.println("添加数据成功!");
%>
</body>
</html>
提示的错误是:exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.apache.jsp.dbprogram_jsp._jspService(dbprogram_jsp.java:107)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
小弟在另一个测试中却碰到了问题,请各位师兄指教.
%@ page contentType="text/html; charset=gb2312" %>
<%@ page info="database handler"%>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<!--导入结束-->
<html>
<head>
<title>数据库连接实验</title>
</head>
<body>
<%
String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
String sConnStr = "Jdbc:Odbc:try";//“try”的意思就是与刚才设置的数据源名对应;
Connection Con = null;
Statement Stmt = null;
try
{
try /*加载驱动程序*/
{
Class.forName(sDBDriver);
}
catch(java.lang.ClassNotFoundException e)
{
out.print("Connect to Database error: " + e.getMessage());
}
//catch(Exception e){}
try /*建立连接*/
{
Con = DriverManager.getConnection(sConnStr,"sa","sa");
}
catch(SQLException e)
{
out.print(e.toString());
}
//catch(Exception e){} Stmt = Con.createStatement(); /*创建JDBC声明*/
String query="CREATE TABLE GUEST" + /*在数据库中创建新的表*/
"(NUM VARCHAR(32),"+
"USERNAME TEXT,"+
"CONTENT TEXT,"+
"PASSWORD INTEGER,"+
"TOTAL INTEGER,"+
"REALNAME TEXT)";
Stmt.executeUpdate(query); /*更新数据库*/
}
catch (Exception e) {}
out.println("恭喜,表连接创建成功!");
%>
<%
ResultSet RS= Stmt.executeQuery("SELECT * FROM EMPLOYEE WHERE eage<25"); /*连接到数据库中的表EMPLOYEE上*/
String tt; /**号表示选择表中所有的列*/
String link; /*若选择其中的某几列可以将*号换成列标号*/
String makeStr; /*WHERE语句表示条件选择*/
out.print("<table border=2 style=color:blue >");
while (RS.next()) {
out.print("<tr><td>");
tt = RS.getString("ename"); /*查询表中NUM字段的内容,字段内容可能使数组,默认列输出*/
out.print(tt);
out.print("</td><td>");
tt = RS.getString("esex");
out.print(tt);
out.print("</td><td>");
tt = RS.getString("eage");
out.print(tt);
out.print("</td><td>");
tt=RS.getString("egrade");
out.print(tt);
out.print("</td><td>");
}
out.print("</table>");
RS.close();
out.println("数据查询成功!");
%>
<% /*在数据库中添加数据*/
String sql="INSERT INTO EMPLOYEE VALUES ('5','aaa','m',54,'hehe')";
Stmt.executeUpdate(sql);
out.println("添加数据成功!");
%>
</body>
</html>
提示的错误是:exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.apache.jsp.dbprogram_jsp._jspService(dbprogram_jsp.java:107)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
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Class.forName("com.microsoft.jdbc.sqlserver.QSLServerDriver");
这样就应该可以了哈!
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page info="database handler"%>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<!--导入结束-->
<html>
<head>
<title>数据库连接实验</title>
</head>
<body>
<%
String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
String sConnStr = "Jdbc:Odbc:try1";//“try”的意思就是与刚才设置的数据源名对应;
Connection Con = null;
Statement Stmt = null;
try
{
try /*加载驱动程序*/
{
Class.forName(sDBDriver);
}
catch(java.lang.ClassNotFoundException e)
{
out.print("Connect to Database error: " + e.getMessage());
}
try /*建立连接*/
{ Con = DriverManager.getConnection(sConnStr,"sa","sa");
}
catch(SQLException e)
{
out.print(e.toString());
}
if(Con!=null) { Stmt = Con.createStatement(); } else
out.println("Sorry!"); /*创建JDBC声明*/
String query="CREATE TABLE GUEST" + /*在数据库中创建新的表*/
"(NUM VARCHAR(32),"+
"USERNAME TEXT,"+
"CONTENT TEXT,"+
"PASSWORD INTEGER,"+
"TOTAL INTEGER,"+
"REALNAME TEXT)";
Stmt.executeUpdate(query); /*更新数据库*/
} out.println("恭喜,表连接创建成功!");
%>
<%
ResultSet RS= Stmt.executeQuery("SELECT * FROM EMPLOYEE WHERE eage<25"); /*连接到数据库中的表EMPLOYEE上*/
String tt; /**号表示选择表中所有的列*/
String link; /*若选择其中的某几列可以将*号换成列标号*/
String makeStr; /*WHERE语句表示条件选择*/
out.print("<table border=2 style=color:blue >");
while (RS.next()) {
out.print("<tr><td>");
tt = RS.getString("ename"); /*查询表中NUM字段的内容,字段内容可能使数组,默认列输出*/
out.print(tt);
out.print("</td><td>");
tt = RS.getString("esex");
out.print(tt);
out.print("</td><td>");
tt = RS.getString("eage");
out.print(tt);
out.print("</td><td>");
tt=RS.getString("egrade");
out.print(tt);
out.print("</td><td>");
}
out.print("</table>");
RS.close();
out.println("数据查询成功!");
%>
<% /*在数据库中添加数据*/
String sql="INSERT INTO EMPLOYEE VALUES ('5','aaa','m',54,'hehe')";
Stmt.executeUpdate(sql);
out.println("添加数据成功!");
Stmt.close();
Con.close();%>
</body>
</html>提示还是:
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.apache.jsp.dbprogram_jsp._jspService(dbprogram_jsp.java:115)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.30 logs.
因为在con被初始化的时候已经进行了try catch 捕捉.那么应该不会出现上面那位大哥说的这种情况,所以后来进行判断我觉得也是没有必要的.问题应该不是出在这.