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java代碼獲得數(shù)據(jù)源,java如何獲取數(shù)據(jù)源

在jsp中如何獲得數(shù)據(jù)源

在jsp中獲得數(shù)據(jù)源的方法是通過jdbc或者datasource連接到數(shù)據(jù)庫然后獲取得到。

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1、jsp頁面代碼:

%@page contentType="text/html" pageEncoding="UTF-8"%

%@taglib prefix="c" uri=""%

jsp:useBean id="db" class="cc.openhome.DatabaseBean"/

!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

""

html

head

meta http-equiv="Content-Type"

content="text/html; charset=UTF-8"

title測試數(shù)據(jù)庫連接/title

/head

body

c:choose

c:when test="${db.connectedOK}"連接成功!/c:when

c:otherwise連接失敗!/c:otherwise

/c:choose

/body

/html

2、在tomcat中配置

JDBCDemo context.xml

?xml version="1.0" encoding="UTF-8"?

Context antiJARLocking="true" path="/JDBCDemo"

Resource name="jdbc/demo"

auth="Container" type="javax.sql.DataSource"

maxActive="100" maxIdle="30" maxWait="10000" username="root"

password="123456" driverClassName="com.mysql.jdbc.Driver"

url="jdbc:mysql://localhost:3306/demo?

useUnicode=truecharacterEncoding=UTF8"/

/Context

3、在java后臺實現(xiàn)數(shù)據(jù)源的連接

import java.io.Serializable;import java.sql.*;

import javax.naming.*;

import javax.sql.DataSource;

public class DatabaseBean implements Serializable {

private DataSource dataSource;

public DatabaseBean() {

try {

Context initContext = new InitialContext();

Context envContext = (Context)

initContext.lookup("java:/comp/env");

dataSource = (DataSource) envContext.lookup("jdbc/demo");

} catch (NamingException ex) {

throw new RuntimeException(ex);

}

}

public boolean isConnectedOK() {

boolean ok = false;

Connection conn = null;

SQLException ex = null;

try {

conn = dataSource.getConnection();

if (!conn.isClosed()) {

ok = true;

}

} catch (SQLException e) {

ex = e;

} finally {

if (conn != null) {

try {

conn.close();

} catch (SQLException e) {

if(ex == null) {

ex = e;

}

}

}

if(ex != null) {

throw new RuntimeException(ex);

}

}

return ok;

}

}

java 用程序創(chuàng)建數(shù)據(jù)源怎么做

jdbc數(shù)據(jù)庫連接:1.加載驅(qū)動Class.forName(“xxxDriver”)2建立連接:Connection conn= DriverManager.getConnection(url,user,password);(url是連接地址ip端口號和數(shù)據(jù)庫實例名,user用戶名,password密碼)3獲取statement對象:Statement stmt=conn.createStatement();4通過Statement執(zhí)行Sql語句:stmt.executeQquery(String sql)會返回查詢結(jié)果集,stmt.executeUpdate(String sql)返回int型,表示影響記錄的條數(shù);5處理結(jié)果:ResultSet rs=str.executeQuery(String sql);while(rs.next()){

System.out.println(rs.getInt(id));

}

5:關(guān)閉數(shù)據(jù)源:rs.close();

下面是連接各種數(shù)據(jù)庫的方法:

1、Oracle8/8i/9i數(shù)據(jù)庫(thin模式)

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

String url="jdbc:oracle:thin:@localhost:1521:orcl";

//orcl為數(shù)據(jù)庫的SID

String user="test";

String password="test";

Connection conn= DriverManager.getConnection(url,user,password);

2、DB2數(shù)據(jù)庫

Class.forName("com.ibm.db2.jdbc.app.DB2Driver ").newInstance();

String url="jdbc:db2://localhost:5000/sample";

//sample為你的數(shù)據(jù)庫名

String user="admin";

String password="";

Connection conn= DriverManager.getConnection(url,user,password);

3、Sql Server7.0/2000數(shù)據(jù)庫

Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();

String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb";

//mydb為數(shù)據(jù)庫

String user="sa";

String password="";

Connection conn= DriverManager.getConnection(url,user,password);

4、Sybase數(shù)據(jù)庫

Class.forName("com.sybase.jdbc.SybDriver").newInstance();

String url =" jdbc:sybase:Tds:localhost:5007/myDB";

//myDB為你的數(shù)據(jù)庫名

Properties sysProps = System.getProperties();

SysProps.put("user","userid");

SysProps.put("password","user_password");

Connection conn= DriverManager.getConnection(url, SysProps);

5、Informix數(shù)據(jù)庫

Class.forName("com.informix.jdbc.IfxDriver").newInstance();

String url =

"jdbc:informix-sqli://123.45.67.89:1533/myDB:INFORMIXSERVER=myserver;

user=testuser;password=testpassword";

//myDB為數(shù)據(jù)庫名

Connection conn= DriverManager.getConnection(url);

6、MySQL數(shù)據(jù)庫

Class.forName("org.gjt.mm.mysql.Driver").newInstance();

String url ="jdbc:mysql://localhost/myDB?user=softpassword=soft1234useUnicode=truecharacterEncoding=8859_1"

//myDB為數(shù)據(jù)庫名

Connection conn= DriverManager.getConnection(url);

7、PostgreSQL數(shù)據(jù)庫

Class.forName("org.postgresql.Driver").newInstance();

String url ="jdbc:postgresql://localhost/myDB"

//myDB為數(shù)據(jù)庫名

String user="myuser";

String password="mypassword";

Connection conn= DriverManager.getConnection(url,user,password);

8、JDBC-ODBC橋

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

Connection con=DriverManager.getConnection("jdbc:odbc:jsp");

jsp為建立的odbc數(shù)據(jù)源名,事先要先將SQL server的表設(shè)置為數(shù)據(jù)源。在“管理工具”-“數(shù)據(jù)源odbc”里用系統(tǒng)DNS添加。

8.Oracle8/8i/9i數(shù)據(jù)庫(thin模式)

//import java.sql.*;

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

String url="jdbc:oracle:thin:@localhost:1521:orcl"; //orcl為數(shù)據(jù)庫的SID

String user="test";

String password="test";

Connection conn= DriverManager.getConnection(url,user,password);

Statement stmtNew=conn.createStatement();

9.DB2數(shù)據(jù)庫

//import java.sql.*;

Class.forName("com.ibm.db2.jdbc.app.DB2Driver ").newInstance();

String url="jdbc:db2://localhost:5000/sample"; //sample為你的數(shù)據(jù)庫名

String user="admin";

String password="";

Connection conn= DriverManager.getConnection(url,user,password);

Statement stmtNew=conn.createStatement();

10.Sql Server7.0/2000數(shù)據(jù)庫

//import java.sql.*;

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();

//String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db2"; //7.0、2000

String url="jdbc:sqlserver://localhost:1433;DatabaseName=db2"; //2005

//db2為數(shù)據(jù)庫名

String user="sa";

String password="";

Connection conn= DriverManager.getConnection(url,user,password);

Statement stmtNew=conn.createStatement();

11.Sybase數(shù)據(jù)庫

//import java.sql.*;

Class.forName("com.sybase.jdbc.SybDriver").newInstance();

String url =" jdbc:sybase:Tds:localhost:5007/myDB";//myDB為你的數(shù)據(jù)庫名

Properties sysProps = System.getProperties();

SysProps.put("user","userid");

SysProps.put("password","user_password");

Connection conn= DriverManager.getConnection(url, SysProps);

Statement stmtNew=conn.createStatement();

12.Informix數(shù)據(jù)庫

//import java.sql.*;

Class.forName("com.informix.jdbc.IfxDriver").newInstance();

String url = "jdbc:informix-sqli://123.45.67.89:1533/myDB:INFORMIXSERVER=myserver;

user=testuser;password=testpassword"; //myDB為數(shù)據(jù)庫名

Connection conn= DriverManager.getConnection(url);

Statement stmtNew=conn.createStatement();

13.MySQL數(shù)據(jù)庫

//import java.sql.*;

//Class.forName("org.gjt.mm.mysql.Driver").newInstance();

Class.forName("com.mysql.jdbc.Driver");

//String url ="jdbc:mysql://localhost/myDB?user=softpassword=soft1234useUnicode=truecharacterEncoding=8859_1";

String url ="jdbc:mysql://localhost:3306/myDB";

//myDB為數(shù)據(jù)庫名

Connection conn= DriverManager.getConnection(url,"root","root");

Statement stmtNew=conn.createStatement();

14.PostgreSQL數(shù)據(jù)庫

//import java.sql.*;

Class.forName("org.postgresql.Driver").newInstance();

String url ="jdbc:postgresql://localhost/myDB" //myDB為數(shù)據(jù)庫名

String user="myuser";

String password="mypassword";

Connection conn= DriverManager.getConnection(url,user,password);

Statement stmtNew=conn.createStatement();

15.access數(shù)據(jù)庫直連用ODBC的

//import java.sql.*;

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver") ;

String url="jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};DBQ="+application.getRealPath("/Data/ReportDemo.mdb");

Connection conn = DriverManager.getConnection(url,"sa","");

Statement stmtNew=conn.createStatement();

16.程序計時

long time1=System.currentTimeMillis();

long time2=System.currentTimeMillis();

long interval=time2-time1;

17.延時

try {

Thread.sleep(Integer.Parse(%%1));

} catch(InterruptedException e) {

e.printStackTrace();

}

18.連接Excel文件

//import java.sql.*;

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

String url = "jdbc:odbc:driver={Microsoft Excel Driver (*.xls)};DBQ=D:\\myDB.xls"; // 不設(shè)置數(shù)據(jù)源

String user="myuser";

String password="mypassword";

Connection conn= DriverManager.getConnection(url,user,password);

Statement stmtNew=conn.createStatement();

如何java類中如何取得在xml文件查詢數(shù)據(jù)庫的結(jié)果

你是使用JNDI獲得數(shù)據(jù)源對象的嗎?如果是:

1,、配置context.xml文件

Context

Resource name="jdbc/news"

auth="Container"

type="javax.sql.DataSource"

maxActive="100"

maxIdle="30"

maxWait="10000"

username="jbit"

password="dbqn"'

driverClassName="Oracle.jdbc.driver.OracleDriver"

url="jdbc:oracle:thin:@localhost:1521:daataName"

/Context

以上用的是Oracle數(shù)據(jù)庫的驅(qū)動和url

你可以換成SQL的

2、配置web.xml文件

resource-ref

res-authContainer/res-auth

res-typejavax.sql.DataSource/res-type

res-ref-namejdbc/news/res-ref-name

/resource-ref

3、添加數(shù)據(jù)庫驅(qū)動

4、在javaBean中編寫代碼,使用lookup()方法獲得數(shù)據(jù)源對象

public class BaseDAO {

private static Connection conn = null;

public static Connection getConnection() {

try {

Context context = new InitialContext();

DataSource ds = (DataSource) context

.lookup("java:comp/env/jdbc/news");

conn = ds.getConnection();

} catch (Exception e) {

e.printStackTrace();

}

return conn;

}

}

注:lookup("java:comp/env/jdbc/news");

中的參數(shù)"java:comp/env/"+數(shù)據(jù)源名稱的形式

如果你要的話我正好有這Struts2的項目我可以給你看看

數(shù)據(jù)源可以用Java代碼創(chuàng)建嗎

詳情如下:

以JNDI方式創(chuàng)建數(shù)據(jù)源首先要配置數(shù)據(jù)源的相關(guān)連接信息,也就是數(shù)據(jù)源連接池。該配置應(yīng)該在Tomcat安裝目錄下的conf/context.xml 文件中配置,在Eclipse的J2EE架構(gòu)下,也可以把context.xml文件創(chuàng)建在/META-INF目錄下。

正確的配置后,就可以在程序中以JNDI的方式創(chuàng)建數(shù)據(jù)源,得到數(shù)據(jù)庫連接并進(jìn)行相應(yīng)的操作。

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