The JSP connection database displays the database data and the Java Connection Database call data.

JSP calls the database directly, requires the database connection related JAR package:

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "pageencoding= "UTF-8"%> <%@ page import= "java.sql.*"%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >The database data queried is: <%//registered database driver Class.forName ("Oracle.jdbc.driver.OracleDriver");//Get database connection Connection conn = drivermanager.getconnection ("jdbc:oracle:thin:@172.21.2.98:1531:f3t", "SECU", "SECU"); Statement stmt = conn.createstatement (); ResultSet rs =stmt.executequery ("Select * from Hd_point")%><table border= "1" width= " ><%while" (Rs.next ()) {%><tr><td><%=rs.getstring (1)%></td><td><%=rs.getstring (2)%></td> <td><%=rs.getstring (3)%></td></tr><%}%></table></body>

Java Configuration Database Connection code (reproduced here: http://www.cnblogs.com/hanruyue/p/5977617.html):

PackageCom.hanqi.test;importJava.sql.connection;importJava.sql.drivermanager;importJava.sql.resultset;importJava.sql.sqlexception;importJava.sql.statement;public classTest {public static voidMain (string[] args) {//Access database//1. Load driver: Loads the database corresponding to the package name Oracle.jdbc.driver//1. (Load Database driver Class) Oracledriver.class try{Class.forName ("Oracle.jdbc.driver.OracleDriver"); This is a fixed//2. Gets the database connection: the Java Driver Manager//url-the database address, different database writing different 127.0.0.1 and localhost all represent native//url-database address: User- User name: password-password Connection for connection DriverManager drive manager Connection conn=Drivermanager.getconnection ("JDBC:ORACLE:THIN:@127.0.0.1:1521:ORCL", "test0816", "123456"); SYSTEM.OUT.PRINTLN ("Connection succeeded"); Operation Database-Add or delete change//3. Get Operational Database declaration Statement st=conn.createstatement ()//statement declaration createstatement Create declaration//4.DML increase Data// Perform update operation//return value represents the number of data record bars affected by the operation//int I=st.executeupdate ("INSERT into student (sno,sname,ssex)"//+ "values (' 120 ', ' Harry ', ' Male ') "); int i=st.executeupdate ("Update student set ssex= ' man ' where ssex= ' 1 '"); SYSTEM.OUT.PRINTLN ("Add data successful return value =" +i);//return value//5. query data//resultset data result set ResultSet rs=st.executequery ("SELECT * FROM Student "); Traversing the result set traversal must be a loop//next () to determine if the next record exists, move the pointer to the next record on the while(Rs.next ()) {//Read the data String sno=rs.getstring ("Sno"  ); String sname=rs.getstring ("sname"); String ssex=rs.getstring ("Ssex"); System.out.println ("sno=" +sno+ "sname=" +sname+ "ssex=" +ssex);}//Release resources//Release Resources Purpose: system resources are reduced for each program running in Windows. Some programs will consume a lot of system resources, even if the program is closed, in memory or some useless DLL files are running, which makes the system running speed down. rs.close (); St.close ();//Close Database conn.close ();} catch (ClassNotFoundException |  SQLException e) {//TODO auto-generated catch block e.printstacktrace ();          }}} 

The JSP connection database displays the database data and the Java Connection Database call data.