今天做了一个小的测试，JDBC连接oracle数据库，网上的例子很多，这儿仅做了简单的Java代码测试是否连接成功。前提是要引入ojdbc.jar包。

Java代码如下：

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package com.learning;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Test {
	// 连接url
	private static String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	// 用户名
	private static String user = "charice";
	// 密码
	private static String password = "123456";

	public static Connection conn;
	public static PreparedStatement ps;
	public static ResultSet rs;
	public static Statement st;

	// 连接数据库的方法 
	public static Connection getConnection() {
		try {
			// 初始化驱动包
			Class.forName("oracle.jdbc.driver.OracleDriver");
			// 根据数据库连接字符，名称，密码给conn赋值
			conn = DriverManager.getConnection(url, user, password);

		} catch (Exception e) {
			e.printStackTrace();
		}
		return conn;
	}

	//测试能否与oracle数据库连接成功  
	public static void main(String[] args) {
		/*Test basedao=new Test();
		basedao.getConnection();
		if(conn==null) {
			System.out.println("与oracle数据库连接失败！");
		}else{
			System.out.println("与oracle数据库连接成功！");
		}  */

		query();
	}

	// 查询代码
	public static void query() {
		conn = getConnection();
		try {
			String sql = "select * from t_icpc_userinfo"; 
			st = conn.createStatement();  

			ResultSet rs = st.executeQuery(sql); 
			System.out.println("最后的查询结果为：");
			
			// 打印结果集
			while (rs.next()) {
				String userid = rs.getString("userid"); 
				String nickname = rs.getString("nickname");  
				String sex = rs.getString("sex");  
				String signinfo = rs.getString("signinfo");  
				System.out.println(userid + " " + nickname + " " + sex + " " + signinfo);  
			}
			
			conn.close();
		} catch (SQLException e) {
			System.out.println("查询数据失败");  
		}
	}
	
	// 删除代码
	public static void delete() {
		conn = getConnection();
		
		String sql = "delete from t_icpc_userinfo where userid = '100001'";
		try {
			st = conn.createStatement();
			int count = st.executeUpdate(sql);
			System.out.println(count);
			conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	// 修改操作
	public static void update() {
		conn = getConnection();
		
		String sql = "update t_icpc_userinfo set signinfo = '你是一个人吗' where userid = '100002'";
		
		try {
			st = conn.createStatement();
			int count = st.executeUpdate(sql);
			System.out.println(count);
			conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	// 插入操作
	public static void insert() {
		conn = getConnection();
		
		String sql = "insert into t_icpc_userinfo(userid, nickname, sex, signinfo) values('100003', 'wang', '2', '又要测试')";
		
		try {
			st = conn.createStatement();
			int count = st.executeUpdate(sql);
			System.out.println(count);
			conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
}