配置文件：
<Context path="/apple" docBase="D:\workspace\bolg\webdoc"
???????? privileged="true" antiResourceLocking="false" antiJARLocking="false">
?<Resource name="jdbc/blogdb" auth="Container"
??? type="javax.sql.DataSource"
??? maxActive="100" maxIdle="30" maxWait="10000"
??? username="root" password=""
??? driverClassName="com.mysql.jdbc.Driver"
??? url="jdbc:mysql://localhost:3306/blogdb?autoReconnect=true"/>
</Context>
調用方式:
?Context ctx = null ;
?Connection conn = null;
?Statement stmt = null ;
?ResultSet rs = null;
?try{
??ctx = new InitialContext();
??if( ctx == null) throw new Exception("沒有匹配的環境!");
??DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/blogdb");
??if( ds == null ) throw new Exception("沒有匹配的數據庫!");
??conn = ds.getConnection();
??stmt = conn.createStatement();
??rs = stmt.executeQuery(" select * from tbl_blog");
??while(rs.next()){
???out.print(rs.getString(2));
??}
??
?}catch(Exception e){
??e.printStackTrace();
?}finally{
??if(rs!=null) rs.close();
??if(stmt!=null) stmt.close();
??if(conn!=null) conn.close();
??if(ctx!=null) ctx.close();
?}