我有数据源。代码如下：
public class DataSource {
Connection connection = null;
BasicDataSource bdsource = new BasicDataSource();
public DataSource() {
bdsource.setDriverClassName("com.mysql.jdbc.Driver");
bdsource.setUrl("jdbc:mysql://localhost:3306/databaseName");
bdsource.setUsername("UserName");
bdsource.setPassword("PassWord");
}
public Connection createConnection() {
Connection con = null;
try {
if (connection != null) {
System.out.println("Can't create a new connection");
} else {
con = bdsource.getConnection();
}
} catch (Exception e) {
e.printStackTrace();
}
return con;
}
}
我需要在jsp上显示数据库中的一些数据。因此，如何在jsp中设置数据源而又不让世界知道jsp中的用户名，密码和数据库名称？
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>
<html>
<head>
<title>JSTL sql:setDataSource Tag</title>
</head>
<body>
<sql:setDataSource var="snapshot" driver="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost/TEST"
user="user_id" password="mypassword"/>
<sql:query dataSource="${snapshot}" sql="..." var="result" />
</body>
</html>
更多细节请参考link
连接类别
public class ConnectBean {
private Connection con;
private static ConnectBean instance;
private ConnectBean() throws Exception {
try {
String driver = "oracle.jdbc.OracleDriver";
Class.forName(driver).newInstance();
String url = "jdbc:oracle:thin:@10.0.1.1:1521:base";
String user = "user";
String password = "pass";
con = DriverManager.getConnection(url,user,password);
}
catch (ClassNotFoundException e) {
throw new Exception(e);
}
catch (SQLException e) {
throw new Exception(e);
}
}
public static synchronized ConnectBean getInstance () throws Exception {
if (instance == null) {
instance = new ConnectBean();
}
return instance;
}
public Connection getConnection() {
return con;
}
}
JSP页面
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.Statement"%>
<%@page import="java.sql.Connection"%>
<h2 align="center"><font color="#FF00FF"><strong>Select query in JSP</strong></font></h2>
<table align="center" cellpadding="4" cellspacing="4">
<tr>
</tr>
<tr bgcolor="#008000">
<td><b>Id</b></td>
<td><b>Name</b></td>
</tr>
<%
Statement stmt = evg.oracle_jta.connection.ConnectBean.getInstance().getConnection().createStatement();
ResultSet resultSet = stmt.executeQuery("SELECT * FROM your_table");
out.println("<html><body><h2>The Select query has following results : </h2>");
while (resultSet.next()) {
out.println("<tr bgcolor='#8FBC8F'>");
out.println("<td>"+resultSet.getString("id") + "</td>");
out.println("<td>"+resultSet.getString("name") + "</td>");
out.println("</tr>");
}
%>
</table>