Java/Servlets/WebLogic
Версия от 18:01, 31 мая 2010; (обсуждение)
Weblogic database Servlet
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
public class WeblogicDbServlet extends HttpServlet {
DataSource pool;
public void init() throws ServletException {
Context env = null;
Hashtable ht = new Hashtable();
ht.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
//ht.put(Context.PROVIDER_URL,"t3://localhost:7001");
try {
env = new InitialContext(ht);
pool = (javax.sql.DataSource) env.lookup("oracle-8i-athletes");
if (pool == null)
throw new ServletException(
""oracle-8i-athletes" is an unknown DataSource");
} catch (NamingException ne) {
throw new ServletException(ne);
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
String sql = "select * from athlete";
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
ResultSetMetaData rsm = null;
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out
.println("<html><head><title>Weblogic Database Access</title></head><body>");
out.println("<h2>Database info</h2>");
out.println("<table border="1"><tr>");
try {
conn = pool.getConnection();
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
rsm = rs.getMetaData();
int colCount = rsm.getColumnCount();
//print column names
for (int i = 1; i <= colCount; ++i) {
out.println("<th>" + rsm.getColumnName(i) + "</th>");
}
out.println("</tr>");
while (rs.next()) {
out.println("<tr>");
for (int i = 1; i <= colCount; ++i)
out.println("<td>" + rs.getString(i) + "</td>");
out.println("</tr>");
}
} catch (Exception e) {
throw new ServletException(e.getMessage());
} finally {
try {
stmt.close();
conn.close();
} catch (SQLException sqle) {
}
}
out.println("</table></body></html>");
out.close();
} //doGet
}
