使用JDBC连接Oracle的Java代码

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package org.test.sql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
*
* 2017-2-16 下午23:11
*
*MusicWeb.util.DBUtil
*连接数据库类
*/
public class DBUtil {


private static String driver = "oracle.jdbc.driver.OracleDriver";

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

private String user = "XXX";//oracle数据库的用户名
private String pwd = "XXXXXX";//oracle数据库的用户密码
private PreparedStatement sta = null;
private ResultSet rs = null;
private Connection conn = null;

/**
* 加载驱动程序
*/
static {
try {
Class.forName(driver);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}

/**
* @return 连接对象
*/
public Connection getConn() {
try {
conn = DriverManager.getConnection(url, user, pwd);
} catch (SQLException e) {

e.printStackTrace();
}
return conn;
}

/**
* @param sql
* sql语句增加，删除，修改
* @param obj
* 参数
* @return
*/
public int update(String sql, Object... obj) {
int count = 0;
conn = getConn();
try {
sta = conn.prepareStatement(sql);
if (obj != null) {
for (int i = 0; i < obj.length; i++) {
sta.setObject(i + 1, obj[i]);
}
}
count = sta.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally{

close();
}
return count;
}

/**
* @param sql sql语句
* @param obj 参数
* @return 数据集合
*/
public ResultSet Query(String sql,Object...obj){
conn=getConn();
try {
sta=conn.prepareStatement(sql);
if(obj!=null){
for(int i=0;i<obj.length;i++){
sta.setObject(i+1, obj[i]);
}
}
rs=sta.executeQuery();
} catch (SQLException e) {
e.printStackTrace();
}
return rs;
}

/**
* 关闭资源
*/
public void close() {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (sta != null) {
sta.close();
}
} catch (SQLException e2) {
e2.printStackTrace();
} finally {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
}

}

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