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| 您的位置:首页>>JDBC>>如何在Servlet中连接数据库 |
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如何在Servlet中连接数据库
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| 2005-06-08 来源:JAVA家 作者:JAVA家 |
import java.sql.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Database extends HttpServlet
{
public void doGet (
HttpServletRequest request,
HttpServletResponse response
) throws ServletException, IOException
{
PrintWriter out;
String title = "Simple Servlet connecting to Oracle DB";
// set content type and other response header fields first
response.setContentType("text/html;charset=GB2312");
// then write the data of the response
out = response.getWriter();
out.println("<HTML><HEAD><TITLE>");
out.println(title);
out.println("</TITLE></HEAD><BODY>");
out.println("<H1>" + title + "</H1>");
out.println("<P>This is output from SimpleServlet.");
String driverName = "oracle.jdbc.driver.OracleDriver";
Driver d;
Connection con;
Statement stmt;
ResultSet results;
try {
d = (Driver)Class.forName(driverName).newInstance();
con = DriverManager.getConnection("jdbc:oracle:thin:ndb/ndb@111.222.1.36:1521:PC36");
stmt = con.createStatement();
String sqlstr = "select SYSDATE from dual";
results = stmt.executeQuery(sqlstr);
displayResult(results,out);
stmt.close();
con.close();
}
catch (Exception e) {
out.println("error: " + e.toString());
}
out.println("</BODY></HTML>");
out.close();
}
public void displayResult(ResultSet results,PrintWriter out){
StringBuffer buf = new StringBuffer();
String temp;
try {
ResultSetMetaData rsmd = results.getMetaData();
int numCols = rsmd.getColumnCount();
int i, rowcount = 0;
// get column header info
for (i=1; i <= numCols; i++){
if (i > 1) buf.append(",");
buf.append(rsmd.getColumnLabel(i));
}
buf.append("
");
while (results.next() && rowcount < 100){
for (i=1; i <= numCols; i++) {
if (i > 1) buf.append(",");
buf.append((results.getString(i)));
}
buf.append("<br>");
rowcount++;
}
out.println("<br>");
out.println(buf.toString());
results.close();
} catch (Exception e) {
out.println("error: " + e.toString());
return;
}
}
} |
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